A kind of composite desulfurizer and preparation method thereof

Abstract

The invention discloses a compound desulfurizer. The compound desulfurizer comprises the following components in percentage by weight: 30-40% of N-methyldiethanolamine, 40-50% of steric hindered amine, 10-29% of physical absorption solvent and 0.5-1% of defoaming agent. Meanwhile, the invention further discloses a preparation method of the compound desulfurizer. The compound desulfurizer has the advantages that sulfide in mixed gas can be effectively removed, the selectivity is good, the absorption rate of carbon dioxide is low, the handling capacity of subsequent processes is lowered, the sulfur capacity is high, the foaming is difficult, the use concentration is high, and the circulation volume is low; and meanwhile, no extra desulfurizers are need, the integral energy consumption of a desulfurizing system can be reduced by above 20%.

Description

Technical field [0001] The invention belongs to the field of chemical engineering, and specifically relates to a composite desulfurizer and a preparation method thereof. Background technique [0002] Natural gas and refinery gas contain impurities such as carbon dioxide, hydrogen sulfide, carbonyl sulfide, mercaptans, and sulfides, among which sulfur dioxide and sulfur trioxide are generated by the combustion of sulfide which pollutes the environment. Therefore, sulfur compounds in natural gas and refinery gas need to be purified and removed, and carbon dioxide generally does not need to be removed. Currently, alcohol amine wet desulfurization is a common method for removing hydrogen sulfide from natural gas and refinery gas. Alcoholamines currently in use are mostly N-methyldiethanolamine (MDEA) or their mixtures. Such desulfurizers generally have the following shortcomings: 1. Only hydrogen sulfide is removed, no organic sulfur is removed or the removal rate is low. Gases wit...

AI Technical Summary

Problems solved by technology

Most of the currently used alcohol amines are N-methyldiethanolamine (MDEA) or its mixture. This kind of desulfurizer generally has the following disadvantages: 1. Only removes hydrogen sulfide, does not remove organic sulfur or has a low removal rate. Gases with high organic sulfur need to add other desulfurization devices

2. The selectivity to hydrogen sulfide removal is poor, and a large amount of carbon dioxide is also removed while removing hydrogen sulfide. For high CO 2 / H 2 The gas with S ratio will increase the processing capacity of subsequent devices and increase the production energy consumption

3. The solution is easy to foam and cause the loss of amine liquid, so the general use concentration is low, which requires a large amount of amine liquid circulation, resulting in high energy consumption of the device