Cleaning liquid composition and reverse osmosis membrane cleaning method

A reverse osmosis membrane and cleaning solution technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems such as difficult to achieve cleaning effect, limited cleaning effect, etc., to reduce electrical conductivity, reduce pressure difference between front and back , The effect of water production recovery

Active Publication Date: 2015-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above two methods have a certain cleaning effect on the reverse osmosis membrane, the cleaning effect is limited, especially for the reverse osmosis membrane with serious organic and microbial contamination, it is difficult to achieve a good cleaning effect

Method used

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  • Cleaning liquid composition and reverse osmosis membrane cleaning method
  • Cleaning liquid composition and reverse osmosis membrane cleaning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment is used to illustrate the method for cleaning the reverse osmosis membrane provided by the present invention.

[0042] according to figure 1 In the process shown, the two-stage reverse osmosis system is used to treat the raw water with water quality parameters as shown in Table 1. The water treatment capacity is 200L / h until the pressure difference between the front and back of the first-stage reverse osmosis membrane increases by 15% or the pure water output Stop at 15% reduction. Then, clean the reverse osmosis membrane in the secondary reverse osmosis system according to the following process:

[0043] (1) Close the secondary reverse osmosis membrane, adjust the pressure of the primary reverse osmosis membrane to 0.4MPa, and rinse the primary reverse osmosis membrane with reverse osmosis product water at a temperature of 40°C for 10 minutes;

[0044] (2) Mix 20g of hydrazine hydrate with 100L of deionized water to obtain a cleaning solution; add the cleani...

Embodiment 2

[0053] This embodiment is used to illustrate the method for cleaning the reverse osmosis membrane provided by the present invention.

[0054] according to figure 1 In the process shown, the two-stage reverse osmosis system is used to treat the raw water with water quality parameters as shown in Table 1. The water treatment capacity is 200L / h until the pressure difference between the front and back of the first-stage reverse osmosis membrane increases by 15% or the pure water output Stop at 15% reduction. Then, clean the reverse osmosis membrane in the secondary reverse osmosis system according to the following process:

[0055] (1) Close the secondary reverse osmosis membrane, adjust the pressure of the primary reverse osmosis membrane to 0.1MPa, and rinse the primary reverse osmosis membrane with reverse osmosis product water at a temperature of 25°C for 40 minutes;

[0056] (2) Mix 100g of hydrazine hydrate with 100L of deionized water to obtain a cleaning solution; add the clean...

Embodiment 3

[0062] This embodiment is used to illustrate the method for cleaning the reverse osmosis membrane provided by the present invention.

[0063] according to figure 1 In the process shown, the two-stage reverse osmosis system is used to treat the raw water with water quality parameters as shown in Table 1. The water treatment capacity is 200L / h until the pressure difference between the front and back of the first-stage reverse osmosis membrane increases by 15% or the pure water output Stop at 15% reduction. Then, clean the reverse osmosis membrane in the secondary reverse osmosis system according to the following process:

[0064] (1) Close the secondary reverse osmosis membrane, adjust the pressure of the primary reverse osmosis membrane to 0.3MPa, and rinse the primary reverse osmosis membrane with reverse osmosis product water at a temperature of 35°C for 25 minutes;

[0065] (2) Mix 80g of hydrazine hydrate and 100L of deionized water uniformly to obtain a cleaning solution; add t...

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Abstract

The invention discloses a cleaning liquid composition. The composition comprises an agent A and an agent B. The agent A is hydrazine hydrate, and the agent B is straight-chain alkylbenzene sulfonate and / or alkyl sulfonate. The agent A and the agent B are independently preserved. The invention also provides a reverse osmosis membrane cleaning method. The method comprises the steps that: (1) the agent A is mixed with water, such that a cleaning liquid is obtained, wherein the agent A is hydrazine hydrate; (2) the cleaning liquid prepared in the step (1) is used for cleaning the reverse osmosis membrane; during the cleaning process, the agent B is added into the cleaning liquid, wherein the agent B is straight-chain alkylbenzene sulfonate and / or alkyl sulfonate. With the cleaning liquid prepared by using the cleaning liquid composition provided by the invention, the reverse osmosis membrane can be effectively cleaned, such that water output of a reverse osmosis system is substantially recovered. Pressure difference before and after in front of and at back of the reverse osmosis membrane is substantially reduced, and output water conductivity is reduced.

Description

Technical field [0001] The invention relates to a cleaning liquid composition and a method for cleaning a reverse osmosis membrane using the cleaning liquid composition. Background technique [0002] In recent years, with the development of my country's economy and the improvement of overall national strength, the application of reverse osmosis membranes has achieved rapid development, and the application fields have continued to expand. At present, the domestic reverse osmosis process is mainly used for the preparation of pure water and ultra-pure water in the fields of electronics, electricity, food, beverages and chemicals, and a small amount is used for the desalination of brackish water. [0003] In the actual application of reverse osmosis membrane separation technology, membrane fouling is a decisive factor affecting the reliability of the technology. In the membrane filtration process, membrane fouling usually occurs. The so-called membrane fouling refers to the adsorptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/06
Inventor 谢文州郦和生杨玉
Owner CHINA PETROLEUM & CHEM CORP
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