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Preparation method of ECTFE hollow fiber porous membrane for a membrane chemical reactor process

A technology of membrane chemical reactor and porous membrane, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of complex process and difficult control of membrane pore size, and achieve simple process, small pore size and high porosity. high effect

Active Publication Date: 2018-11-23
POTEN ENVIRONMENT GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, when the existing TIPS method is used to prepare ECTFE hollow fiber porous membranes, it is necessary to add water-insoluble inorganic particles, such as SiO 2 , CaCO 3 etc., the process is complicated, and the membrane pore size is not easy to control; therefore, it is necessary to improve the existing process method

Method used

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  • Preparation method of ECTFE hollow fiber porous membrane for a membrane chemical reactor process
  • Preparation method of ECTFE hollow fiber porous membrane for a membrane chemical reactor process

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preparation example Construction

[0026] The present invention provides a method for preparing an ethylene-chlorotrifluoroethylene copolymer hollow fiber porous membrane used in a membrane chemical reactor process, which includes the following steps:

[0027] 1) Add ethylene-chlorotrifluoroethylene copolymer powder and compound diluent to the melting equipment, melt and plasticize to obtain casting liquid; based on the total mass of ethylene-chlorotrifluoroethylene copolymer powder and compound diluent, The mass fraction of ethylene-chlorotrifluoroethylene copolymer powder is 15%-45%; the compound diluent is selected from two of the following diluents: acetyl tributyl citrate, propylene glycol carbonate, and phthalic acid Dibutyl ester, diethyl phthalate, benzophenone, diphenyl carbonate, γ-butyrolactone, sulfolane, glycerol triacetate, diethylene glycol, dioctyl adipate, two sebacate Octyl ester, dioctyl phthalate, diphenylmethane, dibutyl sebacate;

[0028] 2) The casting liquid is extruded through a spinneret a...

Embodiment 1

[0043] 1) Add 1kg of dried ECTFE powder, 2.4kg of diethyl phthalate (DEP), and 1.6kg of dibutyl sebacate (DBS) into a stirred tank and mix;

[0044] 2) After stirring at 260°C for 5 hours, let it stand and degas overnight to obtain a casting solution;

[0045] 3) Extruding the casting liquid through the spinneret, controlling the dry spinning process to 25cm, the drawing speed to 32m / min, and quenching in a water bath at 30°C to obtain the nascent hollow fiber membrane;

[0046] 4) Extract with ethanol at 40°C for 3 hours to obtain ECTFE hollow fiber porous membrane.

Embodiment 2

[0048] 1) Add 2kg of dried ECTFE and a compound diluent composed of 1kg of triacetin (GTA) and 2kg of dioctyl phthalate (DOP) into the twin-screw extruder;

[0049] 2) In a twin-screw extruder, melt and plasticize at 230°C to obtain a casting liquid;

[0050] 3) Extrude the casting liquid through the spinneret, control the dry spinning process to 10cm, the drawing speed to 16m / min, and enter it into a water bath at 10°C for quenching to obtain a nascent hollow fiber membrane;

[0051] 4) Ethanol-n-butanol extraction at 50°C for 4 hours to obtain ECTFE hollow fiber porous membrane.

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Abstract

Embodiments of the invention provide a preparation method of vinyl-trifluorochlor oethylene copolymer hollow fiber porous membrane for the membrane chemical reactor process. The preparation method comprises the following steps: (1) adding vinyl-trifluorochlor oethylene copolymer powder and a compound diluting agent into a melting device, melting, plasticizing, and obtaining a casting membrane solution; (2) extruding the casting membrane solution by virtue of a spinning nozzle, quenching in a gel bath at 0 to 50 DEG C, and obtaining a primary hollow fiber porous membrane; and (3) extracting a diluting agent in the primary hollow fiber porous membrane by using an extraction agent, and obtaining a hollow fiber porous membrane. The preparation method of the vinyl-trifluorochlor oethylene copolymer hollow fiber porous membrane provided by embodiments of the invention is simple in process; and by adjusting the type and proportion of the compound diluting agent as well as the technological parameters of the preparation process, the vinyl-trifluorochlor oethylene copolymer hollow fiber porous membrane with small aperture, high porosity and / or high strength can be obtained.

Description

Technical field [0001] The invention relates to the technical field of hollow fiber porous membrane preparation, in particular to a preparation method of an ethylene-chlorotrifluoroethylene copolymer hollow fiber porous membrane used in a membrane chemical reactor process. Background technique [0002] Membrane chemical reactor technology is a combination of membrane separation process and chemical reaction, which can be used for turbidity removal, hardening removal and silicon removal, etc., with high integration and low energy consumption. The technology has loose water inlet conditions, suitable for high-turbidity and high-hardness wastewater, and at the same time has good water quality, the turbidity of the water is ≤0.5NTU, and the total hardness of the water (CaCO 3 )≤10mg / L, the total silicon produced in the water≤5mg / L. [0003] The membrane material of the existing membrane chemical reactor is polytetrafluoroethylene (PTFE), which has excellent mechanical properties, chemi...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/08B01D71/44
CPCB01D67/0011B01D69/08B01D71/44
Inventor 毕飞冯晨晨吕宾安龙王洪声
Owner POTEN ENVIRONMENT GRP
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