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Ultrafiltration membrane cleaning agent and cleaning method thereof

A technology of ultrafiltration membrane and cleaning agent, which is applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of short service life, frequent cleaning, and insignificant effect, and achieve the effect of improving cleaning effect and temperature

Inactive Publication Date: 2021-03-12
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We have tried the universal cleaning scheme provided by the membrane manufacturer, as well as some existing conventional cleaning technologies. Although the membrane flux has been improved to a certain extent, the effect is not significant, the service life is short, and the cleaning is frequent.

Method used

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  • Ultrafiltration membrane cleaning agent and cleaning method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: Independent research on cleaning method one

[0064] (1) a, alkali cleaning agent proportioning: sodium hypochlorite 625ppm (10wt% sodium hypochlorite 50kg), industrial sodium hydroxide (99wt%) 10kg, mixing and preparing cleaning liquid 8m 3 . b. Preparation of pickling agent: 100kg of citric acid, made into cleaning solution 8m 3 .

[0065] (2) Alkali washing: according to the steps (2) and (3) of Comparative Example 1, the medicine feeding cycle and the soaking operation were performed twice.

[0066] (3) Flushing: perform venting, backwashing, and positive flushing operations according to step (5) of Comparative Example 1, and the effluent pH of the extensive pH test paper detection system is <8.

[0067] (4) Citric pickling: according to the step (2) and step (3) of comparative example 1, the medicine feeding cycle and the soaking operation were performed twice.

[0068] (5) Flushing: perform venting, backwashing, and positive flushing operations acco...

Embodiment 2

[0071] Embodiment 2: Self-research cleaning method 2

[0072] (1) a, alkali cleaning agent proportioning: sodium hypochlorite 625ppm (10wt% sodium hypochlorite 50kg), industrial sodium hydroxide (99wt%) 10kg, mixing and preparing cleaning solution 8m 3 ; b. Preparation of pickling agent: 100kg of citric acid, made into 8m of cleaning solution 3 .

[0073] (2) Alkaline cleaning: add 50% water to the cleaning water tank, open the low-pressure steam valve, wait for the water temperature of the water tank to rise to 25°C, add sodium hypochlorite and sodium hydroxide into the water tank respectively, and then add water to make 8m 3 . Control the opening of the steam valve to keep the water temperature at 25-30°C. According to step (2) and step (3) of comparative example 1, the medicine feeding cycle and soaking are performed twice.

[0074] (3) Flushing: perform venting, backwashing, and positive flushing operations according to step (5) of Comparative Example 1, and the efflue...

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to an ultrafiltration membrane cleaning agent and a cleaning method thereof. The invention provides an ultrafiltration membrane cleaning agent and a cleaning method thereof in order to effectively remove ultrafiltration membrane pollution retentate, recover membrane flux, reduce operation resistance andremarkably improve the cleaning effect. The cleaning agent comprises a component A and a component B, wherein the component A is an aqueous solution of sodium hydroxide and sodium hypochlorite, and the component B is an aqueous solution of citric acid. The cleaning method comprises the following steps of feeding the component A into an ultrafiltration membrane, carrying out circulating alkali washing, and then washing with water, and feeding the component B into an ultrafiltration membrane, carrying out cyclic acid washing, and washing with water again. The pressure at the operation inlet endof the ultrafiltration membrane device can be reduced to the maximum extent, the membrane flux is recovered, the cleaning period is prolonged, and a good cleaning effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an ultrafiltration membrane cleaning agent and a cleaning method thereof. Background technique [0002] Ultrafiltration membrane is a polymer microporous filtration membrane that can separate polymer colloids or suspended particles of a certain size from a solution. With pressure as the driving force, the membrane pore size is 1-100nm to screen out solute molecules smaller than the pore size and to separate particles with a molecular weight greater than 500 Daltons. Ultrafiltration membranes are used in the separation, concentration, and purification of biological products, pharmaceutical products, and food industries; they are also used in terminal treatment devices in blood treatment, wastewater treatment, and ultrapure water preparation. Membrane materials mainly include cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene flu...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D61/14B01D65/06
CPCB01D65/02B01D61/145B01D65/06B01D2321/164B01D2321/168B01D2311/10B01D2311/14
Inventor 李廷微
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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