A two-stage gas washing method

Abstract

The present description is related to the field of hydrocarbon production by gasification of carbonaceous material. It provides a two-stage gas washing method as a part of gas refining. More specifically it discloses a method for hydrogen sulfide and carbon dioxide removal from synthesis gas produced by gasification. It introduces a use of a novel combination of wash approaches for this application. As a specific application, this process is utilized as a part of biomass to liquid (BTL) process.

Description

technical field [0001] This specification relates to the field of hydrocarbon production by gasification of carbonaceous materials. It provides a two-stage gas cleaning method as part of the syngas refining process. More specifically, it discloses a method for removing hydrogen sulfide and carbon dioxide from synthesis gas produced by gasification. It uses a novel combination of cleaning methods for this application, one of which involves chemical reactions and the other is based on physical absorption. As a specific application, the method is used as part of a biomass-to-liquids (BTL) process. Background technique [0002] Gasification of carbonaceous materials primarily produces a mixture of carbon monoxide and hydrogen called synthesis gas. Carbon dioxide, water and various hydrocarbons are by-products present in large quantities in the gasification product. Depending on the source and composition of the carbonaceous feedstock and the gasification conditions, the cont...

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Problems solved by technology

Huge temperature differences between process stages consume a lot of energy and make processing costly

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