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A process for removing methyl mercaptan in carbon dioxide gas

A carbon dioxide, methyl mercaptan technology, applied in gas fuel, gas treatment, petroleum industry and other directions, to achieve the effects of simple and stable operation, improved removal effect, and low equipment requirements

Active Publication Date: 2021-06-01
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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  • A process for removing methyl mercaptan in carbon dioxide gas

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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. The process comprises: 1. mixing carbon dioxide gas containing methyl mercaptan with air to obtain a mixed gas, and the molar ratio of oxygen to methyl mercaptan in the mixed gas It is (0.6~2.5): 1; 2. The volume content of sulfur obtained by reacting the mixed gas under the action of a desulfurization catalyst is not more than 0.1 ppm carbon dioxide gas, and the desulfurization catalyst is made of waste zinc oxide desulfurizer, zinc It is prepared from salt, manganese salt, potassium salt and binder. In the method, the carbon dioxide gas containing methyl mercaptan is mixed with air, and the reaction is carried out under the action of a demethyl mercaptan catalyst. The alcohol catalyst is absorbed, thereby realizing the removal of methyl mercaptan in carbon dioxide gas, avoiding the generation of impurity gas, and greatly improving the removal effect of methyl mercaptan in carbon dioxide gas.

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 Patents(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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