High substitution degree cyanoethyl cellulose and cellulose diacetate commixing hollow fibrous nano filter film and its preparation process

A technology of cyanoethyl cellulose and cellulose diacetate, which is applied to hollow fiber nanofiltration membranes blended with highly substituted cyanoethyl cellulose and cellulose diacetate. The preparation field of this nanofiltration membrane can solve the problem of chemical stability It can achieve the effects of good interception performance, stable performance and good resistance to microbial decomposition.

Inactive Publication Date: 2006-04-26
GUANGDONG ZHONGKE GREEN SPRING WATER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical stability and anti-microbial

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Embodiment 1: the preparation of hollow fiber nanofiltration membrane of the present invention

[0020] (1) Dissolving: Stir 4kg of acetone with a mass fraction of 98%, 80g of distilled water and 4kg of dioxane into a 100L stainless steel dissolving kettle. The solvent must be added with a funnel, and the stainless steel tube is slowly added to the bottom of the kettle to minimize the impact of the solvent. Stimulate the bottom of the kettle to ensure safety. After adding 50% (approximately 4kg) of the above-mentioned solvent, take out the liquid feeding pipe, and add 0.4kg HCEC and 1.6kgCA blending raw materials under stirring while stirring, and finally add the remaining mixed solvent into the kettle and stir and mix evenly. Leave to swell at room temperature for 2 hours, then add 0.2kg of ethanol, and heat the solution to 50°C through a hot water jacket, stir and dissolve at a constant temperature for 6 hours, check the transparency, stop when it is a qualified true ...

Example Embodiment

[0025] Embodiment 2: the preparation of hollow fiber nanofiltration membrane of the present invention

[0026]1) Dissolution: Stir 5.6kg of acetone with a mass fraction of 95% and 7kg of dioxane into a 100L stainless steel dissolution kettle. The solvent must be added with a funnel, and the stainless steel tube is slowly added to the bottom of the kettle to minimize the impact of the solvent on the kettle. Bottom, to ensure safety. Add 50% of the above solvent and draw out the liquid feeding pipe, and add 1.62kg HCEC and 3.78kg CA blending raw materials while stirring, and finally add the remaining mixed solvent into the kettle and stir and mix evenly. Swell at room temperature for 2 hours, then add 1.08kg of methanol, and heat the solution to 55°C through a hot water jacket, stir and dissolve at a constant temperature for 6 hours, check the transparency, stop when it is a qualified true solution, and prepare to filter.

[0027] (2) Filtration: Use a pressure pump to transpor...

Example Embodiment

[0030] Embodiment 3: the preparation of hollow fiber nanofiltration membrane of the present invention

[0031] Except following parameter modification, other is with implementing 1, and modification is as follows: the amount of acetone and dioxane is changed into 4.36kg and 3.64 respectively in the step (1), and ethanol addition is changed into 0.1kg, and by hot water clamp Set the temperature of the solution to 45°C, exhaust once every 9h in step (3), let it stand for 42h to heat to a constant temperature of 49°C, in step (4), the first water bath is 12°C, the second water bath is 35°C, and the second water bath is 35°C. The third water bath is 45° C., and the finished product obtained in step (4) in step (5) is put into 85° C. water for treatment for 8 minutes.

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Abstract

The invention relates to a nano hollow fiber filtration membrane, which is prepared by: mixing and dissolving the material, such as HCEC, CA, acetone, dioxohexacyclic compound, hexacyclic dioxide, and alcohol or ethanol; filtering, defoaming, spinning to form, and post-treating. Wherein, the total of HCEC and CA mixture takes up 20~30% to total mass by mass ratio as 2~3:7~8, the acetone and hexacyclic dioxide solvent is 70~80%; alcohol or ethanol is 10~20% of HCEC and CA mixture by mass ratio as 0.8~1.2:1. This invention has well cutting flow performance, compressive resistance, acid and base resistance, and obtains water flux more than 3.50mL/(cm2íñh), well desalinization ratio by bivalent salt more than 90% and monobasic salt ratio more than 60%.

Description

technical field [0001] The invention relates to a hollow fiber nanofiltration membrane, in particular to a hollow fiber nanofiltration membrane blended with high substitution degree cyanoethyl cellulose and cellulose diacetate, and also relates to a preparation method of the nanofiltration membrane. Background technique [0002] The development of nanofiltration (NF) membranes began in the 1980s. It is a new technology that has developed rapidly in the past two decades. It was developed from reverse osmosis (RO) membranes, also known as loose RO membranes. The membrane pore size Between the RO membrane and the ultrafiltration (UF) membrane, the surface of the membrane is charged, the pore size is in the nanometer range, the operating pressure is less than 1.5MPa, the molecular mass cut-off is 100-1000u, the water flux is high, and the divalent ions are relatively high. Removal, the removal rate is over 90%, and the interception rate of monovalent ions is only 20% to 80%. It ...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/08
Inventor 岑美柱章勤颜少琼哈成勇张一冰
Owner GUANGDONG ZHONGKE GREEN SPRING WATER
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