The world's largest coal-to-olefin (MTO) plant uses domestic butter inhibitors. As of March 12, 1.8 million tons/year of MTO devices using domestically-made new butter inhibitors have been running smoothly for 15 days. The trial results showed that in the MTO plant of Baotou Coal Chemicals Branch of Shenhua Coal Chemicals Co., Ltd., the amount of alkaline butter in the olefin separation plant was reduced by 25.73 when the oxygen scavenging agent and butter inhibitor were imported and stopped at the caustic tower. %, both the energy consumption and material consumption of the caustic washing system equipment are greatly reduced.
The Shenhua MTO device is the world’s first and largest MTO device in the world. The Lummus Company, a patented manufacturer of the caustic washing system separation technology, has specified that the world’s most advanced imported butter inhibitor must be used and must be supplemented at the same time. Oxygen scavenger to meet process design requirements. Therefore, after the device was successfully started in August 2010, the olefin separation device was always filled with both the oxygen scavenger and butter inhibitor.
In order to reduce production costs and fully realize the localization of China's coal-to-olefin technology, Shenhua Baotou Coal Chemical Company decided to try a new type of butter inhibitor product developed and produced by the Beijing Spirer Science and Technology Research Institute. The product has many effects such as inhibition of aldehydes and ketones condensation, inhibition of active olefin polymerization, clean dispersion of dirt and oxygen removal, etc. The single-point injection of coal-based olefin alkali cleaning tower can also significantly improve the operation effect of alkaline washing tower.
The staff of the Sberley Research Institute combined with the actual conditions of the first coal-to-olefins plant in China, provided a “one-stop†use and injection technology program, eliminating the need for the original inlet steam injection heat injection system and the use of inhibitors. With the import of 2/3 of the pharmaceuticals, the amount of butter produced in the spent caustic solution at the bottom of the caustic tower was reduced by 25.73% compared with previous years, and annual revenue could increase by more than 180 million yuan.
It is understood that butter inhibitors are key additives for long-term stable operation of large-scale coal-to-olefin plants. In the MTO olefin separation system, the alkaline scrubber is a very important part, not only inhibiting the production of butter in the conversion gas, but also responsible for the important task of removing acidic gases such as CO2, H2S in the conversion gas. If a large amount of butter is generated in the caustic washing system, the pressure in the caustic tower will be increased, the caustic washing efficiency will be reduced, and the caustic soda discharge will increase. This will cause the waste caustic alkali treatment COD in the downstream to exceed the standard, and even cause the caustic tower to clog up when it is serious. The forced shutdown of the device has seriously affected the long-term stable operation of the entire device.
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