CO gas preparation process

Abstract

The invention provides a CO gas preparation process. The CO gas preparation process mainly comprises the following steps: (1) preparing a raw gas from coke, CO2 and oxygen in a gas making furnace, recovering heat of the raw gas, and removing tar, dust impurities and strong acid ingredients; (2) maintaining or heating a process gas to 30-80 DEG C, removing majority of sulfide in a hydrolysis desulfurizing tower, wherein an organic sulfur hydrolyzing agent and an H2S oxidation desulfurizing agent are mixed or laminated in the tower; (3) separating CO2 from the process gas, removing the rest majority of sulfide at the same time to prepare the CO gas, and enabling the separated sulfur-containing CO2-rich gas to go back to the gas making furnace for recycling. The hydrolysis desulfurizing tower is provided with a vertical sleeve heating structure, a hydrolyzing agent-desulfurizing agent bed layer is arranged between sleeves; the hydrolysis desulfurizing tower melts, gasifies and blows out the captured elemental sulfur when the heat is regenerated at the temperature of 200-300 DEG C, and the elemental sulfur is collected by a regeneration condenser to obtain sulfur. The desulfurizing process of the process is simple and reliable, is easy to control, is large in elasticity of processing capacity, is strongly adaptive to high and low contents and fluctuation of H2S and COS, is safe and environment-friendly, and is low in operation cost.

Description

technical field [0001] The invention relates to a CO gas refining process, in particular to a process for preparing CO gas. Background technique [0002] In metal smelting and organic synthesis, such as preparing reduced iron powder from iron oxide, sodium formate synthesis, and methanol carbonylation to produce acetic acid, CO gas is often used as a reducing agent or reaction raw material, and high-purity CO gas needs to be prepared. [0003] In the prior art, CO gas is mainly produced from coke, carbon dioxide and oxygen in a gas-making furnace. First, crude CO gas with a concentration of 65-70% is produced, and then refined and purified to obtain a high concentration of CO gas such as 97%-98%. Pure CO gas, namely carbon monoxide. The refining mainly includes coal tar removal, sulfides such as carbonyl sulfide (COS), H 2 The removal of S, the purification is mainly CO 2 removal, the refining process also involves organic matter and O 2 The removal of high-purity CO gas...

AI Technical Summary

Problems solved by technology

[0017] (1) Dry method COS hydrolysis and wet method H 2 S removal is carried out in two steps, and the hydrolysis rate of COS is affected by H after hydrolysis. 2 S concentration is COS+H at the inlet of the hydrolysis tower 2 Effect of total concentration of S, COS+H 2 When the total concentration of S is high, the COS hydrolysis rate is low. For example, when the feed gas COS is 3000ug / L and the hydrolysis rate is 90%, there will be 300ug / L left after desulfurization, and subsequent desulfurization treatment will be difficult or costly;

[0018] (2) Wet desulfurization introduces moisture into the process gas and reduces CO 2 Separation efficiency and increased energy consumption, aqueous CO-enriched 2 After the gas is returned to the gas generator and used as a raw material for gas generation, the H in the crude gas produced will be increased 2 content

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