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Absorbent removing thiol from acidic airflow and method therefor

An absorbent and air flow technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of large investment, expensive regeneration and high total consumption index

Active Publication Date: 2008-06-25
SINOPEC NANJING RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Generally, the above solvents are useful for the removal of H 2 S and CO 2 Has high efficiency, but there are many difficulties for thiols
Physical solvents can remove mercaptans to very low levels, but this process is not suitable because these physical solvents absorb other linear alkanes and are expensive to regenerate
In chemical solvents, various alcohol amines only rely on physical dissolution to remove mercaptans. Since the solubility of mercaptans in aqueous solution of alcohol amines is very small, the removal effect on mercaptans is extremely poor. Afterwards, alkaline washing, catalytic oxidation sweetening, and then fine desulfurization by fixed bed dry method are often used, resulting in many overall desulfurization steps and lengthy overall process, so there are many equipments, large investment, and high total consumption indicators

Method used

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  • Absorbent removing thiol from acidic airflow and method therefor

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Embodiment

[0022] The performance of specific absorbents is measured directly on a test rig. The inner diameter of the absorption tower used in the test is 20mm, with φ3×3 stainless steel θ rings inside, the inner diameter of the regeneration tower is 50mm, with φ6×6×1 porcelain Raschig rings inside, and a reboiler is installed at the bottom of the regeneration tower.

[0023] Prepared raw material gas (containing H 2 S 5%, CO 2 13%, methyl mercaptan 246×10 -6 , ethanethiol 132×10 -6 , 1-propanethiol 46×10 -6 , 2-propanethiol 38×10 -6 ) into the bottom of the absorption tower and countercurrently contact with the solution entering from the top of the tower, the acid gas in the gas is absorbed, and the purified gas comes out from the top of the tower and enters the gas-liquid separator to recover the entrained liquid droplets and then empties.

[0024] 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,...

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Abstract

The invention relates to the field of gas purification technology and provides an absorbent and a method for adding the adequate activating agent as absorbent into the compound amine solution. The absorbent and method can get rid of almost all H2S and most of mercaptan. The compound amine consists of MDEA and DIPA, and the activating agent consists of PEG400 and HEPZ or MAL. The invention reduces post treatment process, is economical and has high efficiency.

Description

Technical field: [0001] The invention belongs to the technical field of gas purification, and in particular relates to an absorbent and a method for removing mercaptans from acid gas streams. Such sour gas streams include natural gas, synthesis gas, refinery gas, liquefied petroleum gas, and others. Background technique: [0002] Industrial gases usually contain H 2 S, CO 2 Harmful impurities such as COS, various mercaptans, and sulfides must be removed before further use. So far, there are no less than a hundred technologies applied to gas desulfurization and decarbonization. The most common is that the acid gas stream is in contact with an organic solvent (or an aqueous solution of an organic solvent) in a gas cleaning device. There is already a large body of patent literature on these processes. In general, there are roughly two different solvents for gas cleaning. [0003] The first is a physical solvent, which relies on physical absorption. Typical physical solven...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 毛松柏朱道平丁雅萍叶宁
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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