Regenerated cellulose ultrafiltration membrane and preparation method thereof

A technology of regenerated cellulose and ultrafiltration membrane, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of large solvent consumption, long process flow, poor membrane performance, etc., and achieve good hydrophilic performance , The film-making process is simple and the compatibility is good

Inactive Publication Date: 2016-04-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional cellulose membrane is prepared by the viscose method and the cuproammonia method, which has a long p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] At 80℃, 1g of absorbent cotton with a degree of polymerization of 1200 and a content of α-cellulose of 98wt%, 0.5g of PVP-K90, 0.05g of sodium lauryl sulfate, 0.02g of propyl gallate and 18.43g of 15wt% water Mix the NMMO with NMMO, stir uniformly to dissolve it, it takes about 1h, after degassing and filtering, a 5wt% cellulose casting solution is prepared; the casting solution is cast on a glass plate into a flat film at 70℃, and then this The membrane is placed in the air at 25°C and 90%RH for 100S and then enters 10°C in NMMO containing 50wt% water to solidify for 3min. After washing it with water, soak the membrane with a 50wt% glycerin aqueous solution for 3h, and then place the membrane in room temperature air Dry the regenerated cellulose flat ultrafiltration membrane. The water flux of the membrane is 583L / m 2 ·H, the retention rate of 1% bovine serum protein is 95.5%.

Example Embodiment

[0032] Example 2

[0033] At 100°C, 30g of bamboo pulp with a degree of polymerization of 500 and α-cellulose content of 98.6wt%, 9g PEG200, 1g Tween 80, 2g propyl gallate and 158g NMMO containing 5wt% water were mixed and stirred uniformly It takes about 2 hours to dissolve it. After defoaming and filtering, a 15wt% cellulose casting solution is prepared; the casting solution and deionized water are co-extruded into a tubular film through a spinneret at 78°C. After passing through a 15cm argon air gap (25℃, 60%RH), it enters into NMMO containing 10wt% water at 50℃ to solidify; after washing with water, soak the membrane with a 10wt% glycerin aqueous solution for 24h, and then dry the membrane in room temperature air Dry the regenerated cellulose hollow fiber ultrafiltration membrane. The water flux of the membrane is 364L / m 2 ·H, the retention rate of 1% bovine serum protein is 99%.

Example Embodiment

[0034] Example 3

[0035] At 90°C, 20g of wood pulp with a degree of polymerization of 892 and α-cellulose content of 99.2wt%, 6.4g of PVP-K30, 1.6g of Tween 85, 1g of propyl gallate and 171g of NMMO containing 10wt% of water were mixed , Uniformly stir to dissolve, about 1.5h, 10wt% cellulose casting liquid is prepared after defoaming and filtration; the casting liquid and NMMO (core liquid) containing 20wt% water are spinned at 75℃ The plate is co-extruded into a tubular film, and it is immediately put into NMMO containing 30wt% water at 30℃ for solidification and forming; after washing with water, soak the film with a 30wt% glycerin aqueous solution for 15h, and then dry the film in room temperature air to obtain a regeneration Cellulose hollow fiber ultrafiltration membrane. The water flux of the membrane is 432L / m 2 ·H, the rejection rate of 1% bovine serum protein is 98%.

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PUM

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Abstract

The invention relates to a regenerated cellulose ultrafiltration membrane and a preparation method thereof. The regenerated cellulose ultrafiltration membrane includes a regenerated cellulose hollow fiber ultrafiltration membrane and a regenerated cellulose flat ultrafiltration membrane, and NMMO containing 5 to 15 wt% of water is used as the The solvent directly dissolves the cellulose pulp and additives, and then the regenerated cellulose ultrafiltration membrane is spun by the immersion gel phase inversion method. The present invention adds a polymer pore-forming agent and a surfactant to the preparation of the regenerated cellulose casting solution, and through the combination of the polymer pore-forming agent and the surfactant, the pore structure of the ultrafiltration membrane is synergistically regulated, and the ultrafiltration membrane is improved. Water flux, the surfactant used has good compatibility with the coagulation bath, can inhibit the formation of large cavities, and is easy to prepare ultrafiltration membranes with high mechanical strength. The regenerated cellulose ultrafiltration membrane prepared by the invention has good hydrophilicity and wide application, and is suitable for liquid separation such as oil-water separation, artificial kidney dialysis membrane, sewage treatment in printing and dyeing factories, pressing wastewater in viscose fiber production process, papermaking wastewater treatment, etc. .

Description

technical field [0001] The invention relates to a regenerated cellulose ultrafiltration membrane and a preparation method thereof. Background technique [0002] Cellulose is the most abundant natural polymer on earth. Plants can produce hundreds of millions of tons of cellulose every year through photosynthesis. As a membrane material, cellulose has the advantages of degradability, low cost, good film-forming performance, good biocompatibility, and stable physical and chemical properties. The traditional cellulose membrane is prepared by the viscose method and the cuproammonia method, which has a long process, consumes a large amount of solvent, causes a lot of pollution, and the performance of the prepared membrane is poor. [0003] In recent years, people have devoted themselves to the study of new solvent systems suitable for cellulose dissolution, such as ionic liquids, LiCl / DMAC, PF / DMF, NH 3 / NH 4 SCN, NMMO / H 2 O etc., currently NMMO / H 2 O is the most important ne...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/06B01D69/08B01D67/00
Inventor 汪前东刘必前何敏
Owner INST OF CHEM CHINESE ACAD OF SCI
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