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Method and system for recovering CO in DMC synthesis tail gas through membrane separation

A synthesis tail gas and membrane separation technology, which is applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of failure to take effective recovery methods, waste of effective gas CO, etc., and achieve no secondary pollution and CO recovery rate High, scalable effects

Pending Publication Date: 2022-03-29
四川博菲硕科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at converting the CO into CO in the DMC produced by the existing methanol liquid-phase oxidative carbonylation method. 2 , did not take an effective recovery method to recover CO, resulting in the waste of effective gas CO; the invention provides a method for membrane separation and recovery of CO in DMC synthesis tail gas

Method used

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  • Method and system for recovering CO in DMC synthesis tail gas through membrane separation
  • Method and system for recovering CO in DMC synthesis tail gas through membrane separation
  • Method and system for recovering CO in DMC synthesis tail gas through membrane separation

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Embodiment 1

[0032] The composition and intake conditions of the DMC synthesis tail gas in this embodiment are shown in Table 1.

[0033] Table 1

[0034]

[0035]

[0036] This embodiment also discloses a method for membrane separation and recovery of CO in DMC synthesis tail gas. In this embodiment, the membrane module adopts a single-stage multi-module parallel connection method, including the following steps:

[0037] S1, the DMC synthesis tail gas in Table 1 is washed with water through a water washing tower, and methanol and DMC are removed therein to obtain a crude gas separation;

[0038] S2. After the crude separation gas is separated from the entrained water by the separator, it enters the air-gas heat exchanger and the low-temperature coarse separation gas at the outlet of the cold dryer for gas-gas heat exchange, reducing the temperature of the rough separation gas entering the cold dryer;

[0039] S3. After the gas-gas heat exchange, the crude fraction gas is cooled to ...

Embodiment 2

[0045] The composition and intake conditions of the DMC synthesis tail gas in this embodiment are shown in Table 2.

[0046] Table 2

[0047] Element Concentration (wt%) CO 91 CO 2

6.5 CH 3 Oh

1.6 DMC 0.85 h 2 o

0.05 Intake pressure (MPaG) 1.8 Intake temperature (°C) 50 Intake volume (Nm 3 / h)

1000

[0048] This embodiment also discloses a method for membrane separation and recovery of CO in DMC synthesis tail gas. In this embodiment, the membrane module adopts a two-stage multi-module series connection method, including the following steps:

[0049] S1, the DMC synthesis tail gas in table 2 is washed with water through a water washing tower, and methanol and DMC are removed therein to obtain a crude gas separation;

[0050] S2. After the crude separation gas is separated from the entrained water by the separator, it enters the air-gas heat exchanger and the low-temperature coarse separation gas a...

Embodiment 3

[0058] The composition and intake conditions of the DMC synthesis tail gas in this embodiment are shown in Table 3.

[0059] table 3

[0060] Element Concentration (wt%) CO 91 CO 2

6.5 CH 3 Oh

1.6 DMC 0.85 h 2 o

0.05 Intake pressure (MPaG) 2.4 Intake temperature (°C) 50 Intake volume (Nm 3 / h)

1000

[0061] This embodiment also discloses a method for membrane separation and recovery of CO in DMC synthesis tail gas. In this embodiment, the membrane module adopts a two-stage multi-module series connection method, including the following steps:

[0062] S1, the DMC synthesis tail gas in the table 3 is washed with water through a water washing tower, and methanol and DMC are removed therein to obtain a crude gas separation;

[0063] S2. After the crude separation gas is separated from the entrained water by the separator, it enters the air-gas heat exchanger and the low-temperature coarse separation g...

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Abstract

The invention discloses a method and system for recovering CO in DMC synthesis tail gas through membrane separation, and the method comprises the following steps: pretreating the DMC synthesis tail gas to obtain membrane separation inlet gas; the membrane separation inlet gas is subjected to selective component separation through a plurality of membrane assemblies to obtain permeated gas and retentate gas; wherein the content of CO2 in the DMC synthesis tail gas is 3wt%-15wt%, the sum of the concentrations of methanol and DMC in the membrane separation inlet gas is less than or equal to 50ppm, the pressure of the membrane separation inlet gas is 1.3-2.8 MPaG, the working pressure water dew point of the membrane separation inlet gas is less than or equal to 20 DEG C, the temperature of the membrane separation inlet gas is 25-40 DEG C, CO is impermeable gas, and CO2 and H2O steam are both permeable gas; only a small amount of methanol and DMC need to be removed at a feed gas inlet, the CO recovery rate is high, the pressure drop of effective CO gas before and after membrane separation is smaller than or equal to 100 kPa, and the effective CO gas can be recycled as feed gas after being pressurized by a supercharger.

Description

technical field [0001] The invention relates to the technical field of industrial tail gas treatment, in particular to a method for membrane separation and recovery of CO in DMC synthesis tail gas. Background technique [0002] Dimethyl carbonate (DMC) is a kind of chemical raw material with excellent environmental performance and wide application. It is also an important organic synthesis intermediate. It contains functional groups such as carbonyl, methyl and methoxy in its molecular structure, and has various reactivity. , It has the advantages of safe use, convenience, less pollution and easy transportation in production. Due to the low toxicity of dimethyl carbonate, it is a kind of "green" chemical product with development prospects, which can meet the requirements of the current cleaning process, conform to the strategic trend of sustainable development, and have a variety of excellent properties at the same time, so its synthesis process has received more and more a...

Claims

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Application Information

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IPC IPC(8): B01D53/22C01B32/40
CPCB01D53/226C01B32/40Y02P20/151
Inventor 冯浩席向峰詹敬杰曾浩赖登明
Owner 四川博菲硕科技有限公司
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