Process for removing methyl mercaptan from carbon dioxide gas

A carbon dioxide, methyl mercaptan technology, used in gas fuel, gas treatment, petroleum industry and other directions

Active Publication Date: 2019-09-06
XIAN ORIGIN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will produce a large amount of alkali absorption waste liquid, and chlorine dioxide is also a highly toxic gas with a strong pungent odor

Method used

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  • Process for removing methyl mercaptan from carbon dioxide gas

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Effect test

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1, the carbon dioxide gas that the volume content of methyl mercaptan is 500ppm is passed in gas distribution system and mixes with air, obtains mixed gas; The mol ratio of oxygen and methyl mercaptan in described mixed gas is 1.8:1;

[0031] Step 2, feed the mixed gas obtained in step 1 into the reaction system, and carry out the methyl mercaptan removal reaction in the presence of a methyl mercaptan catalyst to obtain carbon dioxide gas; the pressure of the methyl mercaptan removal reaction is 4.0MPa , the temperature is 300℃, the space velocity of the mixed gas is 1000h -1 The demethylation mercaptan catalyst is prepared from waste zinc oxide desulfurizer, zinc nitrate, potassium permanganate, potassium hydroxide and activated clay, and the waste zinc oxide desulfurizer is zinc oxide desulfurizer after desulfurization reaction , the preparation process of the demethylation mercaptan catalyst is as follows: ...

Embodiment 2

[0033] This embodiment includes the following steps:

[0034] Step 1, the carbon dioxide gas that the volume content of methyl mercaptan is 1000ppm is passed in gas distribution system and mixes with air, obtains mixed gas; The mol ratio of oxygen and methyl mercaptan in described mixed gas is 0.8:1;

[0035] Step 2, feed the mixed gas obtained in step 1 into the reaction system, carry out the methyl mercaptan removal reaction under the condition that the methyl mercaptan removal catalyst exists, and obtain carbon dioxide gas; the pressure of the methyl mercaptan removal reaction is 3.0MPa , the temperature is 300℃, the space velocity of the mixed gas is 800h -1 The demethylation mercaptan catalyst is prepared from waste zinc oxide desulfurizer, basic zinc carbonate, manganese nitrate, potassium hydroxide and attapulgite, and the waste zinc oxide desulfurizer is zinc oxide desulfurization after desulfurization reaction agent, the preparation process of the demethylation merca...

Embodiment 3

[0037] This embodiment includes the following steps:

[0038] Step 1, the carbon dioxide gas that the volume content of methyl mercaptan is 100ppm is passed into gas distribution system and mixes with air, obtains mixed gas; The mol ratio of oxygen and methyl mercaptan in described mixed gas is 0.6:1;

[0039] Step 2, feed the mixed gas obtained in step 1 into the reaction system, and carry out the demethylation mercaptan reaction in the presence of a demethylation mercaptan catalyst to obtain carbon dioxide gas; the pressure of the demethylation mercaptan reaction is 0.1MPa , the temperature is 150℃, the space velocity of the mixed gas is 500h -1 The demethylation mercaptan catalyst is prepared from waste zinc oxide desulfurizer, zinc nitrate, potassium permanganate, potassium nitrate and bentonite, and the waste zinc oxide desulfurizer is zinc oxide desulfurizer after desulfurization reaction, so The preparation process of the demethylation mercaptan catalyst is as follows:...

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Abstract

The invention discloses a process for removing methyl mercaptan from carbon dioxide gas, and the method comprises the following steps of: 1, uniformly mixing the carbon dioxide gas containing the methyl mercaptan with air to obtain a mixed gas, wherein the molar ratio of oxygen to methyl mercaptan in the mixed gas is (0.6-2.5): 1; and 2, reacting the mixed gas under the action of a methyl mercaptan removal catalyst to obtain carbon dioxide gas with the volume content of sulfur not exceeding 0.1 ppm, wherein the methyl mercaptan removal catalyst is prepared from a waste zinc oxide desulfurizer,a zinc salt, a manganese salt, a potassium salt and a binder. According to the invention, the carbon dioxide gas containing the methyl mercaptan is uniformly mixed with the air to react under the action of the methyl mercaptan removal catalyst, and the methyl mercaptan is converted into hydrogen sulfide and absorbed by the methyl mercaptan removal catalyst by controlling the molar ratio of the methyl mercaptan to the oxygen, so that the removal of the methyl mercaptan in the carbon dioxide gas is realized, the generation of an impurity gas is avoided, and the removal effect of the methyl mercaptan in the carbon dioxide gas is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of gas phase desulfurization, and in particular relates to a process for removing methyl mercaptan in carbon dioxide gas. Background technique [0002] As an ideal and clean domestic fuel, natural gas has been widely used. In recent years, my country's natural gas extraction has been increasing year by year, and a large number of high-yield gas fields have been developed successively. However, the CO in the extracted natural gas 2 The content of carbon dioxide varies from high to low. Among them, the average carbon dioxide content in Class III natural gas is 26%, and the carbon dioxide content in Class IV natural gas is higher. Therefore, natural gas must be decarbonized to reduce the carbon dioxide content to less than 3% before it can be used as civil natural gas . However, due to the limitations of the decarbonization process, the enriched carbon dioxide gas after decarbonization often accumulates a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/48B01D53/81B01D53/52C10L3/10
CPCB01D53/52B01D53/81B01D53/8606B01D2251/102B01D2251/602B01D2255/2022B01D2255/2073B01D2255/20792B01D2257/306C10L3/104
Inventor 段超齐小峰张睿王红梅谢晓莉潘蕊娟
Owner XIAN ORIGIN CHEM TECH
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