Method for production of low carbon alcohol and combined production of natural gas and urea from synthetic gas and coke oven gas

Abstract

A method for production of low carbon alcohol and combined production of natural gas and urea from synthetic gas and coke oven gas comprises the following steps: mixing crude synthetic gas with coke oven gas to form raw gas with a hydrogen / carbon ratio meeting low carbon alcohol synthesis; carrying out low temperature methanol washing on the raw gas, carrying out desulfurizing recovery on removed hydrogen sulfide, and carrying out CO2 stripping on removed carbon dioxide to realize purification; carrying out methane separation on the low temperature methanol washed raw gas, preparing LNG or CNG by using the removed methane, carrying out a low carbon alcohol synthesis reaction on methane separated purified gas, carrying out PSA separation on the obtained gas as a purge gas, returning separated gases mainly comprising CO, CO2 and CH4 to the low temperature methanol washing, and carrying out an ammonia synthesis reaction on separated H2 and N2 obtained after air separation to prepare synthetic ammonia; carrying out a urea synthesis reaction on purified CO2 and the synthetic ammonia to prepare a urea product; and carrying out low carbon alcohol separation on obtain liquid phase products to obtain a low carbon alcohol product. The method improves the utilization rate of the raw gas.

Description

technical field [0001] The invention belongs to a method for synthesizing low-carbon alcohol, in particular to a method for producing low-carbon alcohol from synthesis gas and coke oven gas and co-producing natural gas and urea. Background technique [0002] Low carbon alcohol usually refers to the mixture of C1~C5 alcohols. The application prospect is very wide: low-carbon alcohol can be used as an alternative fuel, although its calorific value is low, it is fully combusted and emits less CO, NOx, hydrocarbons, etc. during combustion, which is an environmentally friendly fuel; low-carbon alcohol It can also be used as a fuel additive. The currently used gasoline additive methyl tert-butyl ether will eventually be banned with the advancement of technology due to problems such as storage and transportation, which provides an opportunity for the development of low-carbon alcohols. Moreover, the low-carbon alcohol has a high octane number, and has good explosion-proof and sho...

AI Technical Summary

Problems solved by technology

[0007] The present invention is based on the composition of coke oven gas with more hydrogen and less carbon, while the synthesis gas has more carbon and less hydrogen and contains a large amount of CH 4 The characteristics of the two complement each other to meet the hydrogen-to-carbon ratio for the synthesis of low-carbon alcohols, so as to solve the shortcomings of carbon supplementation in the production of low-carbon alcohols using coke oven gas alone or the need for hydrogen supplementation in the production of low-carbon alcohols from syngas alone, and Can by-produce LNG (liquefied natural gas) or CNG (compressed natural gas)

Images