Preparation method of PPM membrane for desorbing CO2 from organic solvent

An organic solvent, desorption technology, applied in the field of membrane separation, to achieve the effect of excellent separation performance

Inactive Publication Date: 2021-09-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In literature [19], the in situ synthesis of ZIF-8 particles on PDMS membranes was used, but it was not applied to CO 2 In the desorption system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The present invention proposes a method for desorbing CO from organic solvents 2 The preparation method of the PPM membrane comprises the following steps:

[0027] (1) Soak the supporting membrane in the alcohol solution of alkali for 1 hour to obtain the basement membrane;

[0028] (2) dispersing the inorganic matter in water to form an inorganic solution;

[0029] (3) Rinse the basement membrane obtained in step 1) with an alcohol solution and soak it in an inorganic solution overnight;

[0030] (4) Add organic matter to PDMS, then add organic solvent and crosslinking agent to it, ultrasonically disperse for 30-90 minutes, add catalyst and continue to disperse for 2-10 minutes to obtain the final casting solution;

[0031] (5) Soak the base film in the casting solution for 5-30 minutes, take it out and let it stand for 10-30 minutes, put it in an oven and dry it at 60-120°C for 3-6 hours to obtain polydimethylsiloxane separation film (PPM).

[0032] The above meth...

Embodiment 1

[0047] After soaking the basement membrane with 1mol / L NaOH alkaline solution, take it out and soak it in 50mL zinc nitrate solution with a concentration of 0.08mol / L overnight. Weigh 1.314g methylimidazole (Hmim), dissolve it with 3mL methanol, add 5g PDMS polymer solution, 50mL n-heptane solvent, 1mL APTES, ultrasonically disperse at 25°C for 30 minutes, then add 0.4g DBTDL to it and continue ultrasonication Disperse for 3 minutes to obtain a casting solution. Soak the base film in the casting solution for 10 minutes at 25°C, then take the film out and place it in the air for 20 minutes, and finally send the prepared PDMS film into an oven to dry at 110°C for 3 hours.

[0048] The prepared PDMS membrane was soaked in DMC for 24 hours, taken out and weighed, and the solvent absorption rate was about 14.0%. Test the membrane for absorbing CO from 2 After desorption of CO in DMC 2 capacity, CO 2 The permeation flux is 1.96kg / (m 2 h), no penetration of DMC.

Embodiment 2

[0050] After soaking the basement membrane with 1mol / L NaOH alkaline solution, take it out and soak it in 50mL zinc nitrate solution with a concentration of 0.08mol / L overnight. Weigh 1.890g of benzimidazole (Bim), dissolve it with 3mL of methanol, add 5g of PDMS polymer solution, 50mL of n-heptane solvent, 1mL of APTES, ultrasonically disperse at 25°C for 30 minutes, then add 0.4g of DBTDL to it and continue ultrasonication Disperse for 3 minutes to obtain a casting solution. Soak the base film in the casting solution at 25°C for 10 minutes, then take the film out and place it in the air for 15 minutes, and finally put the prepared PDMS film into an oven for 5 hours at 80°C to dry.

[0051] The prepared PDMS membrane was soaked in DMC for 24 hours, taken out and weighed, and the solvent absorption rate was about 13.1%. Test the membrane for absorbing CO from 2 After desorption of CO in DMC 2 capacity, CO 2 The permeation flux is 1.8kg / (m 2 h), no penetration of DMC.

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Abstract

The invention discloses a preparation method of a PPM membrane for desorbing CO2 from an organic solution, belongs to the technical field of membrane separation, and particularly relates to a preparation method of a polydimethylsiloxane membrane (PPM) of an in-situ synthesis MOF material for desorbing CO2 from an organic solvent. The method comprises the following steps: soaking a support membrane in an alcoholic solution of alkali to obtain a base membrane, washing the base membrane with the alcoholic solution, soaking the base membrane in an inorganic solution overnight, adding an organic matter, an organic solvent and a cross-linking agent into PDMS, and adding a catalyst during ultrasonic dispersion to obtain a final membrane casting solution; soaking a base membrane in the membrane casting solution, performing standing, and drying to obtain a polydimethylsiloxane (PPM) separation membrane. The polydimethylsiloxane membrane for separating CO2 from the organic solvent is excellent in solvent resistance, permeation flux, separation factors and other separation performances.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to a method for desorbing CO from an organic solution 2 The preparation method of the PPM membrane, specifically a method for desorbing CO from organic solvents 2 Preparation of Polydimethylsiloxane Membranes (PPM) for In Situ Synthesis of MOF Materials. Background technique [0002] The solvent absorption method is to capture CO before combustion 2 important method. At high pressure, physical solvent absorption outperforms chemical absorption, CO 2 High capture efficiency [1-3] , Conventional physical organic absorbents include methanol (MeOH), polyethylene glycol dimethyl ether (NHD), propylene carbonate (PC), N-methylpyrrolidone (NMP) and the like. [0003] MeOH absorbent requires a lot of energy for the cooling process, and the energy consumption is high. The three solvents of NHD, PC and NMP need a lot of energy in the regeneration process, and the solvents ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D71/70B01D19/00
CPCB01D67/0011B01D71/70B01D69/02B01D69/10B01D19/0031
Inventor 周梦月汤志刚郭栋刘雨冰贲国勋王植
Owner TSINGHUA UNIV
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