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Solvent and method for simultaneous removal of hydrogen sulphide and carbon dioxide

A technology of carbon dioxide and hydrogen sulfide, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve problems such as strong corrosion, formation of scale, and decline in decarbonization performance

Active Publication Date: 2007-05-16
SINOPEC NANJING RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such solvents, MEA or DEA and CO 2 Generate stable carbamate, which requires more heat to decompose during the regeneration process, resulting in greater energy consumption for regeneration
At the same time, carbamate is highly corrosive to equipment and will form scale
In addition, carbamate also exacerbated alkanolamine and CO 2 A series of problems such as increased loss of alkanolamine, decreased decarburization performance, and increased corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The performance of specific absorbents is measured directly on a test rig. The inner diameter of the absorption tower used in the test is 50mm, with a built-in φ6×6×1 porcelain Raschig ring, the inner diameter of the regeneration tower is 70mm, with a built-in φ8×8×1 porcelain Raschig ring, and a reboiler is installed at the bottom of the regeneration tower.

[0022] Prepared raw material gas (containing H 2 S14%, CO 2 9%) enters the bottom of the absorption tower and contacts with the solution that enters at the top of the tower, the acid gas in the gas is absorbed, and the purified gas enters the gas-liquid separator to recover the entrained liquid droplets from the top of the tower and then vents.

[0023] The rich liquid that has absorbed the acid gas is drawn from the bottom of the absorption tower to the top of the regeneration tower, and is regenerated by countercurrent contact with the rising steam in the regeneration tower. The regenerated lean liquid is sent...

Embodiment 2

[0029] This test measures the corrosion of carbon steel by solution. Use A 3 Carbon steel hanging piece, the hanging piece is polished, purified, dried and weighed, then immersed in amine aqueous solution at 100°C, and H 2 S is bubbled into the solution at a certain speed, and the continuous test time is 72 hours. After that, the coupons are taken out, cleaned, dried and weighed, and the weight loss of the coupons is measured. Corrosion of carbon steel by solutions with different compositions is shown in Table 2.

[0030] Table 2. Corrosion rate comparison

[0031]

[0032] The data in Table 2 demonstrate the reduction in corrosivity using the absorbent composition of the present invention.

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PUM

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Abstract

The invention relates to a method for removing hydrogen sulfide and carbon diode, and relative solvent, wherein it uses special amine and water to form mixed water solution, to contact the target gas. The invention can hold the advantages of MDEA mixed solvent.

Description

Technical field: [0001] The invention belongs to the technical field of gas purification, and in particular relates to a solvent and a method used in the process of simultaneously removing hydrogen sulfide and carbon dioxide. Background technique: [0002] Industrial gases usually contain H 2 S and CO 2 Harmful impurities such as carbon dioxide and other harmful impurities must be removed before further utilization. So far, there are no less than hundreds of technologies applied to gas desulfurization and decarbonization, and dozens of technologies are widely used, but the dominant method is alcohol Amine method. [0003] Amine desulfurization uses chemically active substances such as alkylolamines. Solvents such as monoethanolamine (MEA), diethanolamine (DEA), diglycolamine (DGA), and diisopropanolamine (DIPA) were first developed and used abroad. These solvents remove CO 2 、H 2 S efficiency is high, but for the selective removal of H 2 S and organic sulfur are less e...

Claims

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Application Information

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IPC IPC(8): B01D53/52B01D53/62B01D53/78B01D53/14
Inventor 毛松柏朱道平叶宁丁雅萍赵运生陈小花
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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