Sulfur-resistant shift catalyst

There is not much difference between the two; QCS can be fully applied in environments with high co levels, and the key lies in the organization of the process.

Why is the K8-11 sulfur-resistant shift catalyst basically used in the first furnace of all SHELL processes, while QCS from the Qilu Petrochemical Research Institute is considered for use in the last two furnaces? Is it because domestic manufacturers are not confident? I don’t think it’s entirely the case. K8-11 was originally developed by BASF; in 1997, BASF sold K8-11 to ICI. Its production technology and catalyst performance were among the best, and it was successfully used in many facilities.

Comparing the three units of Sinopec: Units 1 and 2 of the sulfur-tolerant shift unit in Yueyang use axial shift reactors designed by Ningbo Engineering Company, along with Qilu QCS-03 small-particle catalysts; pre-shift processing is carried out there to handle part of the shifting task. In Zhijiang, Hubei, no pre-shift processing is used, and traditional axial shift reactors are employed along with JM’s K-811 catalysts. When operating normally, the CO level at the outlet of the shift reactors in these two units can reach 3–5% (when the load is less than 70%), while the CO level at the outlet of the low-shift reactors is around 0.3%, which is sufficient to meet the production requirements. The conversion process in Anqing is the same as that in Yueyang, but Unit 1 uses K-811 catalyst; the CO level at its outlet is typically between 8-10%. Units 2 and 3 employ the Qilu QCS series of catalysts, with the CO level at their outlets being around 1.0%. There are various reasons for the excessive CO levels in Anqing. The main factor is that the coal used there is low-sulfur coal, and desulfurization may occur during the conversion process; moreover, a short circuit in the gases inside the conversion furnace cannot be ruled out. Rectification measures are currently being taken. Overall, there is no fundamental difference between QCS and K-811 in terms of production; if any differences exist, they might lie in their tolerance to low sulfur levels, as well as in their prices.

Personal opinion: It might be due to the issues with the converter internals! Because if the internal components are manufactured by JM, they will require you to use the K-811 catalyst; otherwise, no performance guarantee will be provided! The manufacturer had no choice but to select K-811 for the first batch of catalysts!

I have already discussed in detail the current production situation of sulfur-resistant shift catalysts in another topic; now I will answer the original poster’s question. The K811 series of catalysts exhibits significant performance at pressures above 6.0 MPa; the corresponding catalyst developed by Qilu Petrochemical Research Institute is QCS-01. This catalyst contains Ti as a additive but no potassium. The active components of the catalyst are incorporated into the catalyst carrier through kneading, rather than through an impregnation process. This manufacturing method is complex and results in severe water pollution (as NO3- must be removed), which is why the production process has been changed nowadays. K811 is now produced in Qingdao; it was developed after the former plant manager of Qilu Petrochemical Research Institute retired, in collaboration with foreign investors. Qilu Petrochemical Research Institute was also renamed QCS-03, and this product is designed primarily for high-pressure shift processes. As for the high carbon monoxide concentration in the feed gas, the catalyst is required to have high heat resistance; moreover, the hotspot temperature of the catalyst is related to the conversion rate, so the amount of catalyst to be used can be calculated through kinetic equations in order to control the hotspot temperature and conversion rate. Since all catalysts in this series are kneaded carriers and need to be heated to 500 degrees during production, their heat resistance is not a problem. It’s hard to say about market adoption at the moment; some people prefer foreign products while others prefer domestic ones. Each company has its own strategy, so I can’t give an opinion on market adoption. Now we are also producing this series of sulfur-resistant shift catalysts in Qingdao, and our performance is even better than that of the research institute. Feel free to call, email, or continue the discussion.

Let me ask a less complex question: what is the difference between the catalyst’s peak operating temperature, its optimal reaction temperature, the temperature at the outlet of the converter, and the highest heat tolerance of the catalyst?

Shenmu Chemical uses QCS

The “Phase 2” project of Shenmu Chemical uses QDB-04 from Qingdao Lianxin. QDB-04 is a product developed by Professor Zong based on QCS-04; its most notable feature is that the activation temperature has been reduced to 180°C

Reply to Wang Jingliang: “I have a relatively simple question – what is the difference between the hotspot temperature of a catalyst, its optimal reaction temperature, the exit temperature of the converter, and the maximum heat tolerance of the catalyst? The hotspot temperature of a catalyst refers to the bed temperature during its use.”； The converter outlet temperature is related to the hot spot temperature ； The optimal reaction temperature is a characteristic of the catalyst; each catalyst has its own optimal reaction temperature ； The maximum heat resistance temperature of a catalyst is also one of its characteristics. Depending on the chemical composition of the catalyst and the manufacturing process used, its maximum heat resistance temperature varies. In the case of cobalt-molybdenum catalysts, at excessively high temperatures, the active components cobalt and molybdenum sublimate, resulting in a decrease in their activity ；

Is Professor Zong mentioned upstairs Professor Zong Qiuyun? Could you provide a detailed description of the changes that took place in Shenmu “Phase 2”? This post was last edited by yxjwp on 2008-8-22 at 09:33.]

Regarding the second phase of Shenmu, log in to www.lian*nchem.cn; there is a lot of information available there about catalysts.