Methanol to low-carbon olefins

There is no specific analysis; generally, it occurs very rarely. Apart from low-carbon olefins, the CO_x compounds in the products are mainly CO, with the selectivity for CO_2 being less than 1%. Thermodynamic calculations show that the gas-phase oxidative cracking process can proceed under self-heating conditions, which will **reduce the amount of CO_2 emitted into the atmosphere due to fuel combustion. Due to the presence of a considerable amount of CO in the product, the gas-phase oxidative cracking process is not suitable for producing pure low-carbon olefins.

Reply to 2# TH373637: Could you please tell me where you learned this information or what kind of literature you read! We really need these things right now; it’s urgent! Thank you!

Search online; it should be available, or many chemical engineering forums may have it. You can also visit the Dalian Institute of Physical Chemistry. On June 26, 2010, the next-generation methanol-to-olefins (DMTO-II) technology, which features independent intellectual property rights, underwent an evaluation in Beijing organized by the China Petroleum and Chemical Industry Federation. It received high praise from the experts present, who stated that both the scale of the facility and its technical specifications were at the international leading level. This laid a solid technical foundation for maintaining the leadership of coal-to-olefins technology and supporting the long-term development of China’s new coal-based chemical industry. 　　The DMTO-II technology was developed under the leadership of Shaanxi Coal and Chemical Industry Group Coal Chemical Technology Engineering Center Co., Ltd., based on the pilot-scale results from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, in collaboration with Sinopec Luoyang Petrochemical Engineering Company. An industrial trial with a daily methanol processing capacity of 50 tons was carried out at the Methanol to Olefins Test Base of Shaanxi Coal Chemical Technology Engineering Center Co., Ltd. in Huaxian County, Shaanxi Province. The test setup underwent two phases of testing from July 2009 to May 2010, completing a total of over 800 hours of operational testing. The China Petroleum and Chemical Industry Federation commissioned an expert group to conduct on-site inspections of the DMTO-II industrial test unit and its operation, as well as to carry out 72-hour evaluation and calibration. The data show that the methanol conversion rate reaches 99.97%, and the selectivity for ethylene + propylene is 85.68% ； 2.67 tons of methanol are consumed per ton of ethylene + propylene. This industrial trial used specialized catalysts produced on an industrial scale, and the tests confirmed that the catalysts performed well with a low wear rate. 　　It is reported that the DMTO-II technology combines the conversion of methanol with the reconversion of the C4+ heavy fractions in its products. Both reactions use the same catalyst and rely on fluidized bed technology; this combination allows for more efficient utilization of heat, resulting in higher yields of olefins. The methanol consumption per ton of olefins is reduced by more than 10%, thereby significantly cutting the raw material costs associated with olefin production. The appraisal committee, composed of experts and professors such as Xie Kechang and Wang Xieqing, who are members of the Chinese Academy of Engineering, concluded that the DMTO-II technology possesses independent intellectual property rights, features a reasonable process, is safe and reliable in operation, and boasts advanced technical specifications. It represents another innovation in methanol-to-olefins technology as well as a model of successful collaboration among industry, academia, and research institutions. The DMTO-II industrial trial provided the basic data for a large-scale commercial design, laying the foundation for the construction of a large-scale DMTO-II industrial production facility; it holds good prospects for application ； It is recommended to accelerate the industrial application and promotion of this technology based on the results of DMTO-II. 　　Olefins are basic raw materials in the petrochemical industry, and their downstream products are polyolefin plastic products, which have a wide range of applications. The scale of the olefin industry is also a **indicator of economic development, but it has always relied on petroleum resources for production. Our country has limited oil resources, and the supply-demand imbalance for olefin products is prominent; this phenomenon is common in regions with scarce oil resources. Developing new resource routes for olefin production is a long-term challenge. The technical bottleneck in coal-based olefin production lies in the methanol-to-olefins process; through sustained efforts, China has taken the lead in the world in terms of technology development and industrialization. In 2006, the methanol-to-low-carbon olefins (DMTO) technology was successfully developed. Shenhua Group utilized this technology to build an industrial plant with an annual production capacity of 600,000 tons of polyolefins, which has since been put into operation; this marks the first time that basic chemical raw materials have been produced from coal resources. 　　The emergence of the next-generation methanol-to-olefins DMTO-II technology further enhances the technical and economic competitiveness as well as the resource utilization efficiency. It holds great practical and strategic significance for leveraging China’s advantages in coal resources, alleviating the shortage of oil resources in the country, and developing a new type of coal chemical industry based on coal-to-olefins production.

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Reply 4# TH373637 Understood!