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Super-hydrophobic membrane, preparation method thereof and method for concentrating and recycling MDI waste brine

A super-hydrophobic and wastewater technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, biological water/sewage treatment, etc., to achieve high separation efficiency, high permeability, and uniform pore distribution

Active Publication Date: 2021-05-25
WANHUA CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, no one has mentioned the method of completely separating the neutralized brine and washing wastewater from the inside of the DAM preparation process, and treating the two separately to realize the complete resource utilization of wastewater in the DAM production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] 1. The superhydrophobic membrane used in the membrane extraction device is prepared according to the following steps:

[0099] i. Preparation of bionic template: a) Evenly coat epoxy resin adhesive on the glass substrate, and then evenly spread micron-sized silicon carbide particles on the epoxy resin adhesive located on the glass substrate, and the particle size of the silicon carbide particles is 5 μm; b ) Place the glass matrix covered with micron-sized silicon carbide particles in an oven, and perform curing treatment at 100°C for 80 minutes, then increase the temperature to 160°C and bake for 15 minutes, then take it out and cool it to below 100°C; c) Use a blower Blow the surface evenly for 15 minutes to remove unfixed silicon carbide particles on the surface of the epoxy resin adhesive to form a bionic template similar to the lotus leaf effect;

[0100] ii. Preparation of a fluorosilicone rubber film with a rough surface: mix liquid fluorosilicone rubber (FVMQ): ...

Embodiment 2

[0110] 1. The superhydrophobic membrane used in the membrane extraction device is prepared according to the following steps:

[0111] i. Preparation of biomimetic template: a) Evenly coat epoxy resin adhesive on the glass substrate, and then evenly spread micron-sized silicon carbide particles on the epoxy resin adhesive located on the glass substrate, and the particle size of the silicon carbide particles is 3 μm; b ) Place the glass matrix covered with micron-sized silicon carbide particles in an oven, and perform curing treatment at 100°C for 60 minutes, then increase the temperature to 160°C and bake for 15 minutes, then take it out and cool it to below 100°C; c) use a blower Blow the surface evenly for 15 minutes to remove unfixed silicon carbide particles on the surface of the epoxy resin adhesive to form a bionic template similar to the lotus leaf effect;

[0112] ii. Preparation of a fluorosilicone rubber film with a rough surface: Mix liquid fluorosilicone rubber (FVM...

Embodiment 3

[0122] 1. The superhydrophobic membrane used in the membrane extraction device is prepared with reference to the method described in Example 1, the difference is:

[0123] i. Preparation of bionic template: the particle size of silicon carbide particles is 8 μm, and the curing treatment time at 100° C. is 70 minutes;

[0124] ii. Prepare a fluorosilicone rubber film with a rough surface: mix liquid fluorosilicone rubber (FVMQ): curing agent: solvent in a mass ratio of 100:7:30, and the curing agent is dipropylenetriamine, and the solvent is ethanol;

[0125] iii. Plasma surface treatment: In the plasma surface treatment instrument, ammonia gas and air are introduced according to the volume ratio of 1:1, and the parameter conditions are set as follows: RF power 80W, gas flow rate 700cc / min, vacuum degree 200Pa, base film The single treatment time is 4 minutes, and the intermittent treatment is performed twice; finally, a fluorosilicone rubber membrane with increased membrane po...

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Abstract

The invention belongs to the technical field of industrial waste brine treatment, and particularly relates to a super-hydrophobic membrane, a preparation method of the super-hydrophobic membrane and a method for concentrating and recycling MDI waste brine. The method for concentrating and recycling the MDI waste brine comprises the following steps: 1) carrying out two-phase separation on the MDI waste brine to generate an organic phase and a brine phase; 2) sequentially carrying out aniline extraction, reboiling distillation and TOC removal on the brine phase; and 3) washing the organic phase to obtain washing wastewater, contacting the washing wastewater with an extracting agent for membrane extraction treatment, conveying the washing wastewater after membrane extraction treatment to a biochemical unit and then feeding the washing wastewater into a reclaimed water recycling system. In the membrane extraction treatment, to-be-treated washing wastewater is subjected to extraction treatment through the super-hydrophobic membrane. After being treated by the method disclosed by the invention, the high-concentration brine with the sodium chloride content of 21-25 wt% can be obtained, meanwhile, the treatment process is simplified by utilizing the super-hydrophobic membrane, and steam consumption in the washing wastewater treatment process is avoided.

Description

technical field [0001] The invention belongs to the technical field of industrial waste brine treatment, and in particular relates to a superhydrophobic membrane suitable for extracting high-concentration organic amine wastewater, a preparation method thereof, and a method for concentrating and reusing MDI waste brine. Background technique [0002] MDI is one of the main raw materials in the polyurethane industry. It is a well-known method in the industry to prepare polymethylene polyphenyl polyamine (DAM) by reacting aniline and formaldehyde in the presence of an acidic catalyst, and then to react DAM with phosgene to synthesize MDI. In the process of preparing DAM from aniline and formaldehyde, after the reaction solution obtained from the reaction is neutralized with caustic soda, a large amount of high-concentration brine will be produced. At the same time, a small amount of salt will be entrained in the organic phase obtained after neutralization, which needs to be rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02C02F1/26C02F1/44C02F9/10C02F9/14C02F101/38
CPCB01D67/0011B01D67/0013B01D69/02C02F1/26C02F1/44C02F9/00C02F2101/38C02F1/04C02F3/00B01D2325/38B01D2323/04
Inventor 李永锋邢津铭吴雪峰张宏科范珍龙高学顺曾凡雪崔成成周波赵义兵李鹏杨其林
Owner WANHUA CHEM GRP CO LTD
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