Huisheng’s olefin separation technology will be used in the Pucheng coal-to-olefins project

Could you introduce Huisheng’s specific technical capabilities?

This post was last edited by Dangdangdang on 2010-6-12 22:21. Regarding Huisheng Engineering (China) Co., Ltd.: Huisheng Engineering is a leading service provider in the field of petrochemical, coal chemical, and refining plant projects. It offers clients comprehensive services covering consultation, design, procurement, construction management, EPC contracting, project management, training, and commissioning for such projects. Huisheng Engineering boasts a large number of talented individuals and experts in the fields of petrochemical, coal chemical, and refining industries, both domestically and internationally. It is capable of undertaking the construction and management of large-scale chemical engineering projects using various project management models such as EPC (Design-Procurement-Construction), EM+PC (Engineering Management-Procurement-Construction), EP (Design-Procurement), PC (Procurement-Construction), and PMC (Project Management Contracting), while also providing corresponding technical services. Huisheng Engineering has been recognized as a high-tech enterprise by Shanghai **, holds a full set of high-level qualification certificates, and has passed the QHSE management system certification. Proprietary intellectual property for ethylene cracking furnaces, as well as other patents related to ethylene production and a large number of coal chemical processing technologies. Currently, alone the engineering companies have orders worth over 10 billion. Regarding Huisheng Holdings: Huisheng Chemical was established in 1997, while Huisheng Holdings (Group) Co., Ltd. was founded in 2003. Its headquarters are located in the Zhangjiang High-Tech Park in Shanghai, and it has business branches in over a dozen cities both at home and abroad, employing more than 2,000 people in total. Huisheng Holdings (Group) has 11 subsidiaries, which are organized into four business segments: energy, heavy industry, chemicals, and development. From the upstream and downstream sectors related to oil, gas, and coal, to chemical products and port equipment, Huisheng provides customers with a range of specialized services across various industries, as well as related products. Is there anything else to add downstairs?

This post was last edited by fandian on 2010-6-4 at 15:00. Due to my work, I have some knowledge of this technology, so I’d like to discuss it with everyone. The key to Huisheng MTO olefin separation technology lies in the demethanization section. In the traditional separation process for producing ethylene from steam-cracked naphtha, deep cryogenic separation is used for demethanization; the temperature at the top of the demethanization tower is below -130°C. As a result, a very high level of cooling capacity is required, which leads to high energy consumption. Huisheng MTO olefin separation technology employs a \"pre-cutting + oil absorption\" separation method: the pre-cutting tower is used to separate most of the C2 compounds from methane and hydrogen; methane, hydrogen, and a small amount of C2 compounds exit from the top of the pre-cutting tower, while most of the C2 compounds and heavier components exit from the bottom of the tower. Since a complete separation of C2 compounds from methane and hydrogen is not achieved, the operating temperature of this tower does not need to be very low – cooling with propylene is sufficient, thus eliminating the need for an ethylene refrigeration compressor. The gas phase coming out of the pre-cutting tower contains methane, hydrogen, and some C2 compounds. Since the amounts of methane and hydrogen in the MTO reaction gas are relatively low (only 1/8 to 1/6 of those in naphtha cracking products), it is not economical to use deep cooling for separation. Whiting uses oil absorption to treat this gas; a small absorption tower is employed, with propane serving as the absorbent, to achieve effective separation of methane, hydrogen, and C2 compounds. As the quantities of light gases such as methane and hydrogen are small, and the amount of C2 that needs to be separated is also minimal (most of the C2 has already been separated in the pre-cutting tower), only a small amount of absorbent is required. This approach ensures low-energy separation while minimizing the loss of ethylene. In fact, pre-cutting technology is not a new innovation; its inventor is Professor Ni Jinfang from East China University of Science and Technology, who seems to be the leader in olefin technology at Huisheng. This technology has been applied at Jinshan Petrochemical, Lanzhou Petrochemical, and Dushanzi Ethylene plants. It is said that the 600,000-ton ethylene plant in Daqing, which has now been fully domestically produced, also uses this technology. Apart from Sinopec’s Wuhan ethylene plant, this ethylene separation technology is the only domestically developed one used among China’s more than twenty ethylene plants. Even so, it seems that in two more plants, Professor Ni’s technology was imported through Lummus for domestic use; it simply cannot be applied directly within China – what a pity! In my opinion, what’s truly remarkable about Huiseng’s technology isn’t the use of pre-cutting, nor is it the adoption of oil absorption methods for separating C1 and C2 due to the low presence of light gases such as methane and hydrogen. The key lies in their ability to combine these two approaches together – it’s truly a brilliant idea from Professor Ni!

Could you explain on the 4th floor in detail how hydrogen, methane, and C2 are separated through the adsorption of propane? Maybe I’m too stupid and didn’t figure it out.

First, let’s clarify a concept: propane liquid acts as an absorbent, not an adsorbent. The words \"absorption\" and \"adsorption\" are similar, but they refer to two different separation processes. Among gaseous hydrogen, methane, and C2, C2 is heavier. Based on the principle of like dissolves like, under certain temperatures and pressures, C2 dissolves more easily in the absorbent propane, while hydrogen and methane do not dissolve as easily; thus, a separation between them can be achieved.

This post was last edited by yzhaown99 on 2010-6-8 at 10:19. Huisheng’s separation process is similar to that of LUMMUS; both rely primarily on absorption and analytical separation. The freezing temperature is around -40°, which is a relatively high value (unlike the sub-zero temperatures of -120° used in cryogenic separation; therefore, a low-temperature freezer is not required), and propylene is used as the medium in the freezer. After looking at it, I found that this process is similar to low-temperature methanol washing used in gasification purification. The separation process can be referred to as low-temperature propane washing. I have communicated with Professor Ni. Pre-cutting-oil absorption is an old lady’s concept, but it needs to be combined with LUMMUS in order to enter the domestic market. So, Professor Ni will feel regretful. There is also a heat conversion between the cutting tower and the absorption tower. I hope that domestic technology can break the monopoly. I hope more domestic technologies can go global.

Refrigeration using only propylene cannot achieve -60 degrees; it can only reach around -40 degrees.

This post was last edited and replied to by Feng1986 on 2010-6-9 at 15:26. Reply 9# dahei9971: Everyone, come and learn here*.

Speak with evidence! You can eat whatever you want, but don’t speak carelessly! ! ! 1. The technical approach and origins of Huisheng’s olefin separation technology are already clearly explained in the post above. It would be better for you to do some research before speaking; it’s not difficult to look up Huisheng’s patents. Find out when the patent applications for pre-cutting plus oil absorption were filed, as well as when Professor Ni’s patent for the pre-cutting technology was filed. Speak only after you have understood this information. 2. Do you have Rums’ coal-to-oil PID? Rums is a patent holder for olefins; I haven’t heard that they are also involved in coal-to-oil production. Do you know what MTO is and what coal-to-oil production is? They are different! 3. Do you have Rums’ coal-to-oil PID? How did it come here? You didn’t buy it, did you? 4. You haven’t heard of Huisheng’s achievements in the ethylene industry; it just shows that you know too little. When Professor Ni was working on the separation of olefins, I wonder if you know what olefins are How much do you know about Huisheng’s work in the ethylene industry? 5. Finally, I would like to ask one more question: why is the work done by Chinese people considered stolen? Have you investigated who is stealing from whom? The Chinese were technologically backward for a long time, but they have never lacked wisdom or the spirit to catch up and surpass others – they never have! Don’t assume everything based on your own feelings.

Reply to 9# dahei9971: The person above was too casual in their speech. Such things can be said privately if you think it’s okay, but saying them publicly on a technical discussion forum can result in legal consequences. I’m not a employee of Huiseng, but I know a bit about them. This technology is also as mentioned earlier – it’s the result of Mrs. Ni’s hard work. Huisheng’s technology involves pre-cutting followed by propane washing, while LUMMUS involves pre-depropanation followed by propane washing.