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Method for recovering methane chloride from organic silicon synthetic tail gas

A technology for the synthesis of monochloromethane and tail gas, applied in the direction of organic chemistry, separation methods, chemical instruments and methods, etc., can solve problems such as difficult industrialization, secondary environmental pollution, etc., and achieve the effect of avoiding solvents and reducing production costs

Active Publication Date: 2015-03-04
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process passes the fluid containing methyl chloride through an organic solvent, and uses the method of absorption to transfer the methyl chloride in the fluid into the solvent. A large amount of solvent will inevitably be used, causing secondary environmental pollution, and it is also difficult to carry out industrialization.

Method used

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  • Method for recovering methane chloride from organic silicon synthetic tail gas
  • Method for recovering methane chloride from organic silicon synthetic tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The feed gas composed in Table 1 enters the two-tower adsorption separation system composed of adsorption tower T1, adsorption tower T2 and a series of program-controlled valves (such as figure 1), the adsorption pressure is 0.3MPa, and the tower is filled with a certain ratio of fine-pore silica gel with a particle size of 2-4mm and activated alumina composite adsorbent with a particle size of 3-5mm. After the raw material gas enters the adsorption tower, it goes through the steps of adsorption separation, reverse discharge, evacuation, and boosting in sequence. The non-adsorbed components are discharged from the top of the adsorption tower, and the monochloromethane product gas with a concentration of more than 90% is obtained from the bottom of the adsorption tower. After separation and concentration, the effect of adsorption separation and concentration of monochloromethane as shown in Table 2 is obtained.

[0039] Table 1. Composition and content of organosilicon t...

Embodiment 2

[0044] The raw material gas composed in Table 3 is subjected to adsorption and separation operation under the process scheme of Example 1, and a certain ratio of activated carbon with a particle diameter of 2 to 4 mm and activated alumina combined adsorbent with a particle diameter of 3 to 5 mm is filled in the tower. Obtain the monochloromethane adsorption separation concentration effect as shown in Table 4.

[0045] Table 3. Composition and content of organosilicon tail gas

[0046] gas composition N 2 CH 4 C 2 h 4 C 2 h 6 C 3 h 6 C 3 h 8 CH 3 CL monomer Content V / % 11.52 67.69 1.03 2.63 1.7 1.08 14.24 0.12

[0047] Table 4, embodiment 2 monochloromethane concentration recovery result.

[0048] Example Sorbent Packing Scheme Product gas CHCL 3 / % (V / V) CHCL 3 Recovery rate / % 2 Activated carbon and activated alumina 64.9 58.88

Embodiment 3

[0050] The raw material gas composed in Table 5 is subjected to adsorption and separation operation under the process scheme of Example 1, and the tower is filled with a certain ratio of activated carbon with a particle diameter of 2 to 4 mm and a fine-pore silica gel composite adsorbent with a particle diameter of 2 to 4 mm. Obtain the monochloromethane adsorption separation concentration effect as shown in Table 6.

[0051] Table 5. Composition and content of organosilicon tail gas

[0052] gas composition N 2 CH 4 C 2 h 4 C 2 h 6 C 3 h 6 C 3 h 8 CH 3 CL monomer Content V / % 15.0 23.0 1.0 1.0 2.0 10.0 45.0 3.0

[0053] Table 6, embodiment 3 monochloromethane concentration recovery result.

[0054] Example Sorbent Packing Scheme Product Gas CHCL 3 / % (V / V) CHCL 3 Recovery rate / % 3 Activated carbon and silica gel 92.67 93.09

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Abstract

The invention relates to the field of control and treatment of an organic silicon synthetic tail gas, and particularly relates to a method for recovering methane chloride from the organic silicon synthetic tail gas. The method particularly comprises the following steps of: concentrating the organic silicon synthetic tail gas containing the methane chloride through a pressure swing adsorption and separation system which comprises a plurality of adsorption towers and a series of program control valves, and then adsorbing the methane chloride concentrated to be more than 90% (V / V) to an adsorbent; and then recovering the methane chloride from the adsorbent through a reversed discharge and evacuating desorption method, wherein the recovery rate of the methane chloride can achieve more than 90%. The pressure swing adsorption and separation system comprises at least two adsorption towers filled with the adsorbents and program control valves thereof and sequentially alternately carries out the steps of adsorption, multi-time equalizing pressure drop, reversed discharge, evacuation, equalizing pressure rise, final pressure rise, and the like. The method disclosed by the invention can prevent the solvent from being used, reduce the production cost, is already verified not to cause secondary pollution through experiments, can be industrially applied and is a novel method for adsorbing, separating and recovering the methane chloride from the organic silicon synthetic tail gas.

Description

Technical field: [0001] The invention relates to the emission control of organosilicon synthesis tail gas and the field of concentration, recovery and treatment of monochloromethane, in particular to a method for concentrating and recovering monochloromethane from organosilicon synthesis tail gas through adsorption and separation, and discharging the tail gas up to the standard. Background technique [0002] Organosilicon synthesis tail gas is a mixed gas of various hydrocarbons with a high content of monochloromethane, which is separated by pressure swing adsorption, concentrated and recovered monochloromethane, and the residual gas is incinerated as fuel gas, and then discharged up to the standard. [0003] According to the physical parameters of monochloromethane (boiling point -23.73°C, slightly soluble in water, soluble in ethanol, benzene, carbon tetrachloride and chloroform, can be compressed into a colorless liquid with ether smell and sweet taste, flammable), the boi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04C07C19/03C07C17/389
Inventor 杨云青晨韩太宇何秀容潘锋
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND