Purification Technology Edition: One Question per Week [Third Week of August 2017]
Thread Content
What are the process flows for low-temperature methanol washing, and what are the characteristics of each? Answer: Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is provided from outside, resulting in high cooling demands. ⑶Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. Projects such as the production of large-scale nitrogen fertilizers using domestic materials at the Texas Fertilizer Plant, and the 200,000-ton methanol production at the Weihe Fertilizer Plant have adopted this technology. The 400,000-ton methanol project in Shenmu also employs this technology; it represents the first time that the low-temperature methanol washing process developed by Dalian University of Technology has been scaled up to such a scale on an industrial scale, with no prior record of industrial operation. Coalification Region Purification Technology Edition – 2017 Coal Chemical Industry “My Technical Upgrades” Contest (Generous Prizes Available) http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for Chemical Engineers – Experience Sharing Event “Learning from Others’ Experiences” http://bbs.hcbbs.com/thread-1808158-1-1.html
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands. ⑶Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. Projects such as the production of large-scale nitrogen fertilizers using domestic materials at the Texas Fertilizer Plant, and the 200,000-ton methanol production at the Weihe Fertilizer Plant have adopted this technology. The 400,000-ton methanol project in Shenmu also employs this technology; it represents the first time that the low-temperature methanol washing process developed by Dalian University of Technology has been scaled up to such a scale on an industrial scale, with no prior record of industrial operation.
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is provided from outside, resulting in high cooling demands. ⑶Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. Projects such as the production of large-scale nitrogen fertilizers using domestic materials at the Texas Fertilizer Plant, and the 200,000-ton methanol production at the Weihe Fertilizer Plant have adopted this technology. The 400,000-ton methanol project in Shenmu also employs this technology; it represents the first time that the low-temperature methanol washing process developed by Dalian University of Technology has been scaled up to such a scale on an industrial scale, with no prior record of industrial operation.
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is provided from outside, and the demand for cooling capacity is high
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands. ⑶Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. Projects such as the production of large-scale nitrogen fertilizers using domestic materials at the Texas Fertilizer Plant, and the 200,000-ton methanol production at the Weihe Fertilizer Plant have adopted this technology. The 400,000-ton methanol project in Shenmu also employs this technology; it represents the first time that the low-temperature methanol washing process developed by Dalian University of Technology has been scaled up to such a scale on an industrial scale, with no prior record of industrial operation.
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands. ⑶Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. Projects such as the production of large-scale nitrogen fertilizers using domestic materials at the Texas Fertilizer Plant, and the 200,000-ton methanol production at the Weihe Fertilizer Plant have adopted this technology.
Abroad, there are two processes for low-temperature methanol washing: the Linde process and the Lurgi process. There is no fundamental difference between these two processes in terms of basic principles, and both are highly mature technologies. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coil-type heat exchangers. These exchangers offer high heat exchange efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and subsequent blockage of equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. The LUCI low-temperature methanol washing process does not use shell-and-tube heat exchangers; instead, all heat exchangers are of the tube-shell type. All equipment can be designed and manufactured domestically, thereby saving on investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands. Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China for related technologies. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. This technology has been applied to projects such as the production of large-scale nitrogen fertilizers domestically at the Texas Fertilizer Plant, and the production of 200,000 tons of methanol at the Weihe Fertilizer Plant. The 400,000-ton methanol project in Shenmu also employs this technology; it represents the first time that the low-temperature methanol washing process developed by Dalian University of Technology has been scaled up to such a scale in an industrial installation, with no prior record of industrial operation.
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles. (1) Linde low-temperature methanol washing process: Linde’s patented equipment, the high-efficiency coiled tube heat exchanger, offers high heat exchange efficiency; especially when multiple fluid streams are used for heat exchange, it saves space, has a compact design, and requires low energy consumption； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation volume of the methanol solution is relatively high; as a result, the energy consumption is higher compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands.
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation. After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ★Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coil-type heat exchangers – to improve heat exchange efficiency. This is particularly effective for the combined heat exchange of multiple fluid streams, allowing for reduced space requirements, a compact layout, and lower energy consumption ； However, high-efficiency coiled tube exchangers require foreign design (but can be manufactured domestically). After the feed gas enters the low-temperature methanol washing unit, a small amount of recycled methanol is injected to prevent the gas from freezing and avoid system blockage. A methanol filter is installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and subsequent clogging of equipment and pipes. Nitrogen is generally used for stripping to concentrate hydrogen sulfide, with a carbon dioxide recovery rate of 70%. ★In the LUCI low-temperature methanol washing process, since there is no intermediate circulating methanol to provide cooling capacity, all the cooling required for absorption is supplied from outside ； The absorption temperature of the methanol solution is low, and the circulation volume of the methanol solution is relatively high; as a result, its energy consumption is slightly higher compared to the Linde process, and the size of the absorption tower is also larger. The entire cooling capacity of the system is supplied from the outside, allowing for relatively flexible operation and adjustment. ★Process flow of low-temperature methanol washing at Dalian University of Technology. Dalian University of Technology began researching the process of low-temperature methanol washing in 1983; with the assistance of Sinopec and Zhejiang University, this research was approved by Sinopec in 1999. It won the third prize for scientific and technological progress from Sinopec in 2000, and two domestic patent applications were filed as well. After improvement, this technology adopts a six-tower process similar to the Linde process; it is reported that the cooling load and equipment investment are ~10% lower than those of the Linde process.
Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coil-type heat exchangers. These exchangers offer high heat exchange efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and subsequent blockage of equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. The LUCI low-temperature methanol washing process does not use shell-and-tube heat exchangers; instead, all heat exchangers are of the tube-shell type. All equipment can be designed and manufactured domestically, thereby saving on investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands.
Answer: Currently, there are two processes for low-temperature methanol washing abroad: the Linde process and the Lurgi process. There is no fundamental difference between them in terms of basic principles, and both technologies are highly mature. The two patents have their own characteristics in terms of process flow design, equipment design, and project implementation ； After nearly 20 years of research, Dalian University of Technology in China has also developed a software package for the low-temperature methanol washing process, and obtained two domestic patents. ⑴Linde’s low-temperature methanol washing process utilizes Linde’s patented equipment – high-efficiency coiled tube heat exchangers. These heat exchangers offer high efficiency, especially when multiple fluid streams are involved in the heat exchange process; they require less space, have a compact design, and consume less energy ； High-efficiency coiled tube heat exchangers require foreign design but can be manufactured domestically. A methanol filter must be installed in the methanol solvent circulation loop to remove solid impurities such as FeS and NiS, preventing their accumulation in the system and causing blockages in equipment and pipes. Nitrogen stripping is generally used to concentrate hydrogen sulfide. ⑵The Luchi low-temperature methanol washing process does not use coil-type heat exchangers; instead, all heat exchangers are shell-and-tube type. All equipment can be designed and manufactured domestically, which helps to reduce investment costs. The circulation rate of the methanol solution is relatively high, resulting in higher energy consumption compared to the Linde process, and the size of the absorption tower is also larger. All the cooling capacity of the system is supplied from outside, resulting in high cooling demands. ⑶Low-temperature methanol washing process at Dalian University of Technology: Dalian University of Technology has been conducting research on the low-temperature methanol washing process since 1983, and has filed two patent applications in China. After improvement, this technology uses a six-tower process, which is similar to the Linde process, but it requires more cooling capacity than the Linde process. Projects such as the production of large-scale nitrogen fertilizers using domestic materials at the Texas Fertilizer Plant, and the 200,000-ton methanol production at the Weihe Fertilizer Plant have adopted this technology. The 400,000-ton methanol project in Shenmu also employs this technology; it represents the first time that the low-temperature methanol washing process developed by Dalian University of Technology has been scaled up to such a scale on an industrial scale, with no prior record of industrial operation.