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Micro-filtering or super-filtering film regenerating agent and preparing method

A regenerant, ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane pore blockage, sodium hydroxide residue, etc., and achieve extended service life and low surface adhesion. , The effect of improving the membrane regeneration effect

Inactive Publication Date: 2009-01-14
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the traditional sodium hydroxide solution is regenerated, because sodium hydroxide is not easy to pass through water, especially inside the membrane pores with relatively small pore diameters, there is almost no washing mechanical force, so sodium hydroxide remains in the membrane pores
The alkali-binding retentate remaining in the membrane or the calcium and magnesium ions in the separation solution and cleaning preparation water will form calcium and magnesium compound crystals. If such crystals are formed inside the membrane pores, the membrane pores will be blocked, and due to such The combination of crystals and membrane materials is very tight, and it is generally difficult to regenerate unless special means are used. The decrease in membrane area is permanent.

Method used

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  • Micro-filtering or super-filtering film regenerating agent and preparing method
  • Micro-filtering or super-filtering film regenerating agent and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 2500g of deionized water, add it to a container equipped with a stirrer, add 600g of potassium gluconate while stirring evenly at room temperature, continue mixing for 15 minutes, and confirm that it is completely dissolved. Then add KOH 98% solid 1500g, and react at a certain temperature of 25°C for a certain time for 2.0h. After confirming complete dissolution, add 300 g of aminotrimethylene phosphonic acid, control the total mass by adding deionized water to about 5000 g, adjust the pH of 1% finished product aqueous solution to 12.5-14.0 with active alkali, and obtain finished product 1.

[0021] Water hardness is 50ppm (as CaCO 3 Dilute the finished product 1 40 times with water as a regeneration agent, and pressurize the polysulfone ultrafiltration membrane (molecular weight cut-off of about 1 million Daltons) for about 1 hour each time. The cleaning temperature is controlled at 50°C. Water hardness is 50ppm (as CaCO 3 meter) water under pressure for about 0...

Embodiment 2

[0025] Take 2000g of deionized water, add it to a container equipped with a stirrer, add 450g of potassium gluconate while stirring evenly at room temperature, continue mixing for 15 minutes, and confirm that it is completely dissolved. Then 1850 g of KOH 98% solid was added, and reacted at 32° C. for 1.0 h. After confirming complete dissolution, add 550 g of aminotrimethylene phosphonic acid, control the total mass by adding deionized water to about 5000 g, adjust the pH of 1% finished product aqueous solution to 12.5-14.0 with active alkali, and obtain finished product 2.

[0026] Water hardness is 20ppm (as CaCO 3 Dilute the finished product 2 40 times with water as a regeneration agent, and pressurize the ceramic ultrafiltration membrane (molecular weight cut-off of about 500,000 Daltons) that filters the aloe plant extract for about 5 hours. The flow rate drops to 17% of the design flux, and the cleaning time is about 2 hours. 3 meter) water under pressure for about 0.5...

Embodiment 3

[0032] Take 1850g of deionized water, add it into a container equipped with a stirrer, add 500g of potassium gluconate while stirring evenly at room temperature, and continue mixing for 15 minutes, after confirming that it is completely dissolved. Then add KOH 98% solid 2250g, and react at a certain temperature of 40°C for a certain time of 0.5h. After confirming complete dissolution, add 400 g of aminotrimethylene phosphonic acid, control the total mass to about 5000 g with additional deionized water, adjust the pH of 1% finished product aqueous solution to 12.5-14.0 with active alkali, and obtain finished product 3.

[0033] Water hardness is 140ppm (as CaCO 3 Dilute the finished product 3 40 times with water as a regeneration agent, and pressurize and wash the cellulose acetate nanofiltration membrane that filters the amino acid fermentation liquid for about 8 hours. Before regeneration, the clean water flux of the membrane drops to 25% of the designed flux. The cleaning t...

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Abstract

The present invention relates to a microfiltration or ultrafiltration membrane reclaiming agent and its preparation method, belonging to the field of microfiltration and ultrafiltration membrane cleaning reclaiming agent technology. Said membrane reclaiming agent is made up by using active alkal; containing no sodium ions, water treatment agent and chelating agent through a certain stable chemical preparation process.

Description

technical field [0001] A microfiltration or ultrafiltration membrane regeneration agent and a preparation method thereof belong to the field of microfiltration and ultrafiltration membrane cleaning regeneration agents. It specifically relates to a membrane cleaning regeneration agent prepared by a stabilization process using active alkali without sodium ions, a water treatment agent, and a chelating agent, and also relates to a preparation method of the microfiltration and ultrafiltration membrane regeneration agent. Background technique [0002] Various microfiltration and ultrafiltration membranes are widely used in the food industry, petrochemical industry, sewage treatment, and steel industry. They are mainly used in process steps such as impurity removal, macromolecular substance extraction, desalination, decolorization, organic matter concentration, and oil-water separation. The regeneration process of microfiltration and ultrafiltration membrane has a very important i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/06
Inventor 钱和廖海雁
Owner JIANGNAN UNIV