Reaction system, absorption liquid and method for simultaneously absorbing multiple acid gases

Abstract

The invention provides a reaction system, an absorbing liquid and a method for simultaneously absorbing multiple acid gases. Two absorbing liquids, MDEA (N-methyldiethanolamine) and DETA (diethylenetriamine), are added to the absorbing liquid. The method of mixing solvents and inorganic solvents, MDEA is mainly used to absorb sulfur-containing gases, and its absorption efficiency for carbon-containing gases is low. DETA absorbs carbon-containing gases at a fast rate. Compared with the packed tower, the gas-liquid mass transfer coefficient can be increased by 1-3 orders of magnitude. At the same time, adding a small amount of piperazine and inorganic solvents can make DETA and MDEA have a synergistic effect, further accelerate the absorption speed of carbon-containing gases, and narrow the gap between the absorption speeds of carbon-containing gases and sulfur-containing gases, so that the absorption of sulfur-containing gases and carbon-containing gases can be achieved. Simultaneous absorption of gases, for some mixed gas sources with small content gaps between sulfur-containing gases and carbon-containing gases, there is no need to add two additional absorption processes, optimizing the absorption process steps of mixed gas sources, saving process costs and manpower physical resources.

Description

Technical field [0001] The present invention relates to the field of gas absorption, and more particularly to the reaction system, absorption solution and method of simultaneous absorption of various acidic gases. Background technique [0002] With the development of society and the rapid growth of the economy, the pollution problems brought more and more serious, and the absorption of pollution gases is increasingly important. Generally, the contaminated gas is mainly an acid gas, an acid gas comprises sulfur-containing gas and a carbonaceous gas, which is mainly in the form of an exhaust gas and mixing in the form of a energy gas, such as the tail gas generated by the Claus process. Mixed acid gases in natural gas, each includes hydrogen sulfide (H 2 S) and carbon dioxide (CO 2 ), Mixed in natural gas 2 S and CO 2 Take an example, H 2 S will corrode the pipeline and equipment, CO 2 It will reduce product hot values, affect product performance, therefore need to remove emissions...

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Problems solved by technology

[0004] In order to solve at least one of the current technical problems that sulfur-containing gases and carbon-containing gases cannot be efficiently absorbed at the same time, high regeneration energy consumption of the absorption system, and large equipment occupation, the present invention provides a reaction system for simultaneously absorbing multiple acid gases. It includes: a liquid storage tank, wherein an absorption liquid is arranged, and the absorption liquid includes N-methyldiethanolamine, diethylenetriamine, an organic solvent and an inorganic solvent, and the volume fraction of the inorganic solvent is lower than the volume of the organic solvent Fraction;

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