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Membrane separation device and method for purifying after-treatment mother liquor

A technology for membrane separation and mother liquor, applied in separation methods, chemical instruments and methods, semipermeable membrane separation, etc., can solve the problems of increased investment and production costs, sulfolane ring opening, waste liquid and slag, etc., to achieve strong continuity, Simple operation, no secondary pollution effect

Inactive Publication Date: 2014-07-02
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The deficiencies of the prior art are: this process has high energy consumption, complicated process, and a lot of waste liquid and waste residue; it is time-consuming and labor-intensive, increases investment and production costs, and improper operation can easily cause side reactions such as ring opening of sulfolane

Method used

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  • Membrane separation device and method for purifying after-treatment mother liquor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 1 As shown, a membrane separation device for purifying and post-processing mother liquor includes a solvent tank to be recovered, a feed pump, a basket filter, an activated carbon column filter, a first valve, a first high-pressure pump, a reverse osmosis Membrane device, second valve, permeation membrane distillation device, third valve. Wherein, the outlet of the reverse osmosis membrane device is connected to the inlet of the first high-pressure pump. The osmotic membrane distillation device is equipped with post-treatment mother liquor inlet, reflux liquid inlet, purified process water outlet and concentrated liquid outlet; the second valve is connected with the post-treatment mother liquor inlet, the third valve is connected with the concentrated liquid outlet, the concentrated liquid outlet, the second The two high-pressure pumps are connected to the reflux liquid inlet in sequence.

[0032] During operation, when the post-treatment mother liquor after de...

Embodiment 2

[0036] Add the post-treatment mother liquor containing TMS, water, NaCl and a small amount of polymer powder into the solvent tank to be recovered (the mass fraction of TMS is 4.0%, the NaCl content is 3500ppm, and the conductivity is 0.32×10 3 μS / cm), the post-treatment mother liquor is sent to the basket filter by the feed pump at a flow rate of 400kg / h to remove the remaining polymer powder and impurities in it, and then adsorbed by the activated carbon column filter to remove the remaining trace impurities; then, through The pretreated post-treatment mother liquor enters the reverse osmosis membrane device for desalination through the first high-pressure pump, wherein the reverse osmosis composite membrane module in the reverse osmosis membrane device is a roll-type membrane module, and the reverse osmosis membrane material is a polyarylether sulfone ketone composite membrane , the inlet pressure is 1.00MPa, the outlet pressure is 0.95MPa, and the required membrane area is ...

Embodiment 3

[0039] Add the post-treatment mother liquor containing water, NaF and a small amount of polymer powder to the solvent tank to be recovered (the NaF content is 5400ppm, and the conductivity is 0.34×10 3 μS / cm), the post-treatment mother liquor is pumped to the basket filter by the feed pump at a flow rate of 600kg / h to remove the remaining polymer powder and impurities inside, and then adsorbed by the activated carbon column filter to remove the remaining trace impurities; then, through The pretreated post-treatment mother liquor enters the reverse osmosis membrane device through the first high-pressure pump for the first step of desalination. The reverse osmosis composite membrane module in the reverse osmosis membrane device is a roll-type membrane module, and the reverse osmosis membrane material is polyimide Composite membrane, the inlet pressure is 1.20MPa, the outlet pressure is 1.15MPa, and the required membrane area is 35m 2 , after 8 hours of repeated cycles, the NaF c...

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Abstract

The invention relates to a membrane separation device for purifying after-treatment mother liquor. The membrane separation device comprises a to-be-recycled solvent tank for storing the after-treatment mother liquor, a filter for removing polymer powder and impurities, a reverse osmosis membrane device used for desalting, and a permeable membrane distillation device used for dewatering and concentrating, which are connected in sequence. The invention also relates to a membrane separation method for purifying the after-treatment mother liquor. The membrane separation method comprises the following steps: a, pretreatment: removing the residual polymer powder and the impurities from the after-treatment mother liquor stored in the to-be-recycled solvent tank by using the filter; b, reverse osmosis: desalting the pretreated after-treatment mother liquor by using the reverse osmosis membrane device; c, permeable membrane distillation: dewatering and concentrating the desalted after-treatment mother liquor by using the permeable membrane distillation device, discharging concentrate and purifying process water. The membrane separation device and the membrane separation method have the advantages that water, solvent, inorganic salts and a small amount of solid impurities can be separated very well; secondary pollution is avoided; the separation effect is good; the device and the method belong to the field of polymer solution concentrating and recycling.

Description

technical field [0001] The invention relates to the field of concentration and recovery of polymer solutions, in particular to a membrane separation device and method for purifying and post-processing mother liquor which combines reverse osmosis technology and osmotic membrane distillation technology. Background technique [0002] Polyaryletherketone / sulfone resins refer to aromatic polymers containing ether bonds, ketone bonds and sulfone bonds. Industrial products include: polyether ether ketone (PEEK), polyether ketone (PEK), polyether ether ketone Ketone (PEEKK), biphenyl polyether ether ketone ketone (PEDEKK), polyether sulfone (PES), polyphenylene ether sulfone (PPSU), polybiphenyl sulfone ether sulfone (PESDS), and some Resin products such as polyaryletherketone or polyaryletherketone sulfone homopolymers, random copolymers and block copolymers with functional group substituents and main chains containing biphenyl bonds and sulfone bonds. Crystalline polymers. Polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/58B01D36/02C07D333/48
Inventor 陈锐斌代惊奇苏成晓吴浩斌曹民曾祥斌
Owner KINGFA SCI & TECH CO LTD
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