What are the sulfur processes? ?

I would like to ask the original poster, is your company's process similar to the SCOT process? What is the actual sulfur recovery rate? Which domestic owners use your process?

Your company should be involved in the acid-making process, right? whether? Please enlighten me!

CLaus is basically the same. There is a difference between the SCOT process and the RAR process. The SCOT process does not require external hydrogen supply in the hydrogenation part. The sulfur yield of the device reaches over 99.9%. Currently, there are KTI sulfur plants (non-acid-making process) in Dalian, Qingdao, Fujian, and Guangdong.

This post was last edited by adsl121 on 2009-11-23 02:22. The poster said that KTI's CLAus+RAR from Italy and CLAus+HCR from Nigi from Italy are compared with the traditional CLAus+SCOT process. The front part is a Claus process, and the rear part belongs to the exhaust gas hydrogenation reduction absorption treatment process. The above-mentioned process principles are similar, the degree of exhaust gas purification is basically the same, and the total sulfur yield of the device can reach more than 99.9%. In order to achieve emission standards, domestic exhaust gas hydrogenation reduction and absorption treatment processes are currently being used. According to reports, there are 8 sets of RAR process equipment built in China, distributed in 5 companies including Maoming Petrochemical.

This post was last edited by adsl121 on 2009-11-23 02:21. Does RAR not require external hydrogen supply?

The SCOT process also requires external hydrogen supply. What is the difference between the two?

Yes, I have been reading information on this recently. It says that there is no CLAus+RAR in the RAR process. What is going on?

RAR technology and CLAus+RAR are the same thing. As far as I know, there are three versions of the RAR process in my country. One is the early RAR process such as Maoming Petrochemical, in which the exhaust gas is exchanged with the heat exchanger at the outlet of the hydrogenation reactor. ； Second, in the mid-term, for example, in the RAR process of Dalian Petrochemical, the tail gas is heated through a heated tube furnace. ； Third, in the latest RAR process, such as Yunnan Petrochemical, the exhaust gas heating method is changed to medium-pressure steam, and the catalyst is changed to a low-temperature catalyst.

Summary of the application of new selective catalytic oxidation sulfur recovery technology in the field of coal chemical industry: The traditional selective catalytic oxidation sulfur recovery process is mainly used in the sulfur recovery of Claus tail gas in the coal chemical industry. The typical representative is the super/super-euro Claus process. This article describes a new type of selective catalytic sulfur recovery process and catalyst, which can be used to solve the problem of excessive sulfur content emissions in the tail gas during the application of Claus or Super Claus in the coal chemical industry. It can be used as another sulfur recovery process for users to choose in the coal chemical industry. keywords: Selective catalytic oxidation of sulfur recovery Claus coal chemical industry 1 Background In recent years, my country's coal chemical industry has ushered in a period of rapid development. The acid gas produced by coal chemical plant purification (such as from low-temperature methanol washing) contains about 20~30% sulfur. For the sulfur recovery of this part of the gas, the superclaus process is generally used in China for sulfur recovery. Super/Super Euclaus sulfur recovery technology is widely used in the fields of natural gas and oil refining. However, in the coal chemical industry, there are problems such as small sulfur recovery scale, low acid gas concentration, complex composition, and unstable sulfur content. As a result, Super/Super Euclaus exhaust gas sulfur emissions generally exceed the standard in coal chemical industry applications. This article introduces a new type of selective oxidation catalyst and sulfur recovery process to catalytically oxidize H2S in sour gas. The new catalyst and reactor technology control the reaction temperature to reduce SO2 generation and increase the total sulfur yield to ≥99.8%. 2 Traditional sulfur recovery process in coal chemical industry The traditional Claus reaction is a thermodynamic equilibrium reaction. Limited by the sulfur dew point at the reaction temperature, even if three-stage conversion is used, the sulfur recovery rate is only about 98%. As the requirements for environmental quality become increasingly stringent, the sulfur content in exhaust gases no longer meets emission standards. Therefore, a wide variety of exhaust gas treatment processes have been developed. At present, the most widely used industrial method is the SuperClaus method. 2.1 Super/super-optimal Claus method. For a long time, people have conducted a lot of research on improving the sulfur recovery rate of Claus reaction, but no major breakthrough has been achieved. The main constraints are as follows: (1) Claus reaction is a reversible reaction. The conversion rate is limited by the thermodynamic equilibrium at the reaction temperature. (2) The large amount of moisture generated during the Claus reaction is difficult to separate from the process gas, and the H2S concentration in the process gas continues to decrease, which further restricts the balance from moving in the direction of sulfur generation. .(3) A certain amount of organic sulfur compounds (COS, CS2), etc. are generated in the thermal reaction section of the Claus device, and they do not undergo Claus reaction with SO2. (4) The Claus reaction requires strict control of the H2S/SO2 ratio in the process gas, making it difficult to control the entire process. In response to the above problems, the former Dutch company Comprimo successfully developed the SuperClaus method. The previous part of the two-stage converter of this method is the same as that of the conventional Claus, but a special selective catalytic oxidation catalyst is placed in the three-stage converter, which is mainly controlled by dynamics. Another feature is that it no longer requires H2S/SO2 to be 2, and only requires an excess of H2S. The total sulfur recovery rate can reach 99%. If a hydrogenation reactor is added before the three-stage converter, the total sulfur recovery rate can reach 99.5%. The investment consumption is relatively low. However, the reactor of this method uses an adiabatic reactor, and the activity temperature range of the catalyst is narrow, so the concentration of H2S at the Claus secondary outlet must be 20% 98%. 3 domestic Claus converters 100%, 2 super-optimal Claus converters 2% ~ 15% 99.5%, 2 foreign Claus converters, 2 hydrogenation reactors, 1 super-optimum Claus reactor 1 130% Clinsulf-ssp1%~20% 99.6% 2 foreign internally cooled reactors 130% by-product steam can be used as Claus tail gas treatment process New sulfur recovery process 0~25% (higher concentration can adopt tail gas recycling) 99.8% 2 domestic internally cooled reactors 1 hydrogenation reactor 120% by-product steam can be used as Claus tail gas treatment process 5 Conclusion Low-concentration H2S gas mainly comes from low-sulfur natural gas, refinery gas, synthesis gas, etc. With each * * The requirements for sulfur emission concentration are becoming more and more stringent. The conventional Claus+ tail gas treatment method is relatively large in terms of equipment investment and operating costs. In actual industrial devices, the H2S concentration does not operate very well within the range of 10% to 20%. In view of this, the newly developed new sulfur recovery process makes up for the shortcomings of other processes within this concentration range. Whether in terms of process performance or investment cost, this new sulfur recovery process has reached the international advanced level. It can also be used as a Claus tail gas treatment unit. It only needs one hydrogenation reactor and one selective oxidation reactor to achieve a total sulfur recovery rate of 99.8%. Therefore, this new sulfur recovery process has broad market prospects in the recovery of low-concentration H2S in coal chemical industry.