System for adjusting hydrogen-carbon ratio of synthesis gas and simultaneously producing byproduct hydrogen through coupling of membrane separation and pressure swing adsorption

Abstract

The invention discloses a system for adjusting the hydrogen-carbon ratio of synthesis gas and simultaneously producing a byproduct hydrogen by coupling membrane separation and pressure swing adsorption, wherein raw material gas firstly enters a membrane separator, permeate gas and impermeable gas are obtained under the pushing of the pressure difference of two sides of a separation membrane, the permeate gas is subjected to pressure swing adsorption to purify high-concentration product hydrogen and desorption gas with higher carbon monoxide concentration, the desorption gas is pressurized by a compressor and then is mixed with the membrane separation impermeable gas to form the synthesis gas with the hydrogen-carbon ratio meeting the requirement. The amount of permeate gas entering pressure swing adsorption is adjusted by adjusting the operation pressure of membrane separation or the membrane separation area, so that the hydrogen production amount of pressure swing adsorption is adjusted, and the hydrogen-carbon ratio of the synthesis gas is adjusted. The advantages of two gas separation methods of membrane separation and pressure swing adsorption are fully utilized, the whole set of system is low in energy consumption, no exhaust waste gas is generated, and the purposes of adjusting the hydrogen-carbon ratio of the synthesis gas and producing high-concentration hydrogen as a byproduct are achieved at the same time.

Description

technical field [0001] The invention relates to the field of gas separation in coal chemical industry and petrochemical industry, in particular to a system for adjusting the hydrogen-carbon ratio of synthesis gas and simultaneously producing hydrogen by-product through membrane separation and pressure swing adsorption coupling process. Background technique [0002] The production of different chemical products with syngas requires that the syngas have different hydrogen-to-carbon ratios, such as; Fischer-Tropsch synthesis requires a hydrogen-to-carbon ratio of 3 to 3.6; the synthesis of methanol requires a hydrogen-to-carbon ratio of 2.05 to 2.25; dipropylheptanol (2PH) production requires the hydrogen-to-carbon ratio to be maintained at 1.02 as much as possible; the carbonylation reaction requires a hydrogen-to-carbon ratio of about 1, and the hydrogen-to-nitrogen ratio of synthetic ammonia is required to be 3, so the ratio of synthesis gas is a necessary adjustment method f...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problems described in the background technology and overcome the technical defects of a single technology to adjust the hydrogen-to-carbon ratio of syngas while by-producing hydrogen, the present invention provides a coupling process of membrane separation and pressure swing adsorption to adjust the hydrogen-to-carbon ratio of syngas while by-producing hydrogen system

Images