Method and equipment for producing hydrocarbon with synthetic gas

Abstract

The invention discloses a method for producing hydrocarbon with synthetic gas, which comprises essentially the steps as follows: methanol synthetic reaction of the pressurized synthetic gas is implemented in a methanol synthetic reactor, reaction gas is not separated after being output from a reaction tower and enters a methanol dehydrating reactor under the same pressure level so as to implement the methanol dehydrating reaction and generate the hydrocarbon product, the final reaction gas is cooled and separated so as to generate the hydrocarbon product, water and unreacted synthetic gas, and the separated synthetic gas is either discharged for gas-steam integrated gasification combined cycle (IGCC) or taken as recycled synthetic gas and mixed with the raw material synthetic gas in further methanol synthesis, methanol dehydration and product separation besides little discharge.

Description

technical field [0001] The invention relates to a method and equipment for producing hydrocarbons with synthesis gas, belonging to the field of chemical engineering. Background technique [0002] The method of producing hydrocarbons from syngas produced by coal or natural gas, one is that Sasol Company in South Africa can use the method of Fischer-Tropsch reaction to produce products. The products are mainly diesel oil with complex components, and the generated methane content is high. Further use hydrogenation to refine and process, so the investment is large; the other is to generate oxygenated methanol through synthesis gas, and then dehydrate methanol to generate dimethyl ether for further dehydration to generate hydrocarbons, such as the MTG method of Exxon mobil company (No. The Third China International Coal Chemical Industry and Coal Conversion High-Tech Symposium, October 2006, P187), the main product of MTG method is gasoline, which is of good quality and generates...

AI Technical Summary

Problems solved by technology

For the existing synthetic gas synthesis methanol technology, since a large amount of reaction heat is released in the synthesis of methanol, and the copper-based methanol catalyst is not heat-resistant, it is necessary to remove the reaction heat at the same time as the reaction. Boiler water absorbs heat and produces steam to remove heat. Due to the limited heat transfer capacity, it is necessary to use a circulating gas that is as high as 5 to 10 times the raw material synthesis gas to remove the reaction heat. At this time, the methanol content in the methanol synthesis reaction gas is only 3~ 6%, so it is not suitable to directly dehydrate methanol in the reaction gas to generate hydrocarbons, so the MTG method uses synthesis gas to synthesize methanol first, then cools the reaction gas, and then condenses and separates methanol from the synthesis gas, and finally uses liquid methanol as a raw material Vaporization for dehydration reaction, due to the strong reaction heat of methanol dehydration, mobil's MTG method uses a cycle ratio as high as 9, resulting in high energy consumption

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