Advantages of DMTO at Dalian Institute of Chemical Physics

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This post was last edited by jordan569 on 2013-1-6 at 21:08. Comparison table of DMTO technology and UOP/HYDRO technology at Dalian Institute of Chemical Physics. Project: UOP/HYDRO vs DMTO. Feedstock: Methanol, Dimethyl ether. Capacity: 0.5 t/day, 60–100 Kg/day. Reaction mechanism: Fluidized bed, Fluidized bed. Catalysts: SAPO-34, SAPO-34 (inexpensive). Olefin selectivity (wt.%): Ethylene, Ethylene, propylene; Ethylene, propylene, butylene – 45–50%, >80%, ~90%; 50%, >80%, ~90%. Feedstock consumption (C2 + C3 + C4): 2.659, 1.845 (2.567 for methanol). Number of times reaction regeneration is possible: ~1500. From the above data, it can be seen that the technical levels of these two technologies are roughly equivalent; however, the price of DO123 developed by Dalian Institute of Chemical Physics is only 8–15% of that of similar foreign products, giving it a significant price advantage. It is said that the Dalian Institute of Chemical Physics is developing new catalysts, whose performance will be further improved: the methanol conversion rate will reach 100%, and the selectivity for ethylene + propylene will be greater than 90%. The price of these new catalysts is only 68% of that of the DO123 catalysts. Sinopec Luoyang Engineering Company has been collaborating with Dalian Institute of Chemical Physics on the development of MTO technology for many years, and after various comparisons, it was recommended to use the conventional FCC continuous reaction-regeneration system for the MTO reaction stage. Large-scale continuous reaction-regenerative fluidized bed reactors are widely used in catalytic cracking units and are highly mature and reliable. However, the MTO process and catalytic cracking technology differ to some extent in their reaction-regeneration methods. At present, the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, is carrying out DMTO industrial trials in collaboration with Shaanxi Xinxing Coal Chemical Industry Co., Ltd., with Sinopec Luoyang Engineering Company as the design entity. The scale of this test facility is 50 t/day (equivalent to 3,440 t of ethylene per year), and the construction plan covers only the reaction section, excluding the quenching, compression, purification, and product gas separation sections. The device was completed in December 2005, and its first trial run with feed material was successful on February 20, 2006. After undergoing process condition tests for a total of 1,102 hours across two phases from February 21 to March 2, and from April 21 to May 20, it entered the evaluation operation phase from June 17 to 20, 2006. The 72-hour performance tests showed that the experimental setup operated smoothly, meeting the design parameters and objectives set forth. It was able to satisfy the requirements regarding temperature, pressure, circulation rate, heat extraction, and coking in the reaction-regeneration system. The catalyst’s physicochemical properties and particle size distribution were satisfactory, and its hydrothermal stability was good, making it suitable for use in large-scale industrial fluidized bed systems. The yield of ethylene + propylene was 78.71%, exceeding UOP/HYDRO’s 77.5%. However, there are also issues such as high catalyst loss and design that does not follow optimal laboratory conditions. The main specifications of the test unit are as follows: DMTO process technical specifications. Serial number, Item, Specification: 1. Methanol conversion rate: 99.8%; 2. Olefin selectivity: C2= + C3=: 78.71%; 3. C2= + C3= + C4=: 89.65; 4. Methanol consumption: 2.96 t of methanol per t of ethylene + propylene. Note: # # , 。