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Nanofiltration membrane cleaning agent for brine refinement and preparation method thereof

A technology for cleaning agents and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, seawater treatment, etc., can solve problems such as decreased calcium and magnesium rejection rate, decreased desalination rate, and increased desalination rate of membrane elements, achieving high efficiency, Fast sterilization effect

Active Publication Date: 2019-02-01
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desalination rate of the membrane element decreases after cleaning. The possible reason is that the pollutants form a filter cake on the membrane surface, which increases the desalination rate of the membrane element to a certain extent. When the pollutants are partially removed, the desalination rate may decrease.
[0018] Due to the special one-divalent ion separation characteristics of nanofiltration membranes, the requirements for cleaning agents are more stringent. Most cleaning agents either have poor cleaning effects or have a significant drop in calcium and magnesium rejection after cleaning. Membrane cleaning agents are of great significance to the chemical cleaning of brine nanofiltration devices

Method used

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  • Nanofiltration membrane cleaning agent for brine refinement and preparation method thereof
  • Nanofiltration membrane cleaning agent for brine refinement and preparation method thereof
  • Nanofiltration membrane cleaning agent for brine refinement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) In the stirred reactor, add 15 parts of sodium tripolyphosphate, 5 parts of tetrasodium ethylenediaminetetraacetic acid, 5 parts of sodium hexametaphosphate, 0.5 parts of sodium dodecylbenzenesulfonate, and 200 parts of water part, stir well;

[0057] (2) Under normal pressure, control the temperature at 35-40°C, add 30 parts of citric acid, 5 parts of sulfamic acid, 5 parts of oxalic acid and 5 parts of isothiazolinone in sequence, stir and dissolve evenly;

[0058] (3) Continue stirring at normal pressure at a temperature of 35-40° C. During the stirring period, analyze the pH value to 3-4, and stir for 4 hours to obtain a cleaning agent with a pH value of 3.5.

[0059] Apply this agent to clean the bromine-extracting brine nanofiltration membrane system, the effect is as follows:

[0060]

Embodiment 2

[0062] (1) In the reactor with stirring, sequentially add 5 parts of sodium carbonate, 5 parts of sodium citrate, 2 parts of sodium hexametaphosphate, 3 parts of disodium edetate, 0.3 part of sodium lauryl sulfate, 150 parts of water, stir evenly;

[0063] (2) Under normal pressure, control the temperature at 20-25°C, add 10 parts of citric acid, 5 parts of oxalic acid, 5 parts of tartaric acid, 2 parts of 2,2-dibromo-3-nitrilopropionamide in sequence, stir and dissolve evenly;

[0064] (3) Continue stirring under normal pressure at a temperature of 20° C. During the stirring period, analyze the pH value to 4-5, add ammonia water to adjust the pH value, and stir for 3 hours to obtain a cleaning agent with a pH value of 6.

[0065] Apply this agent to clean the bromine-extracting brine nanofiltration membrane system, the effect is as follows:

[0066]

Embodiment 3

[0068] (1) In the stirred reactor, add 5 parts of sodium citrate, 1 part of sodium hexametaphosphate, 1 part of disodium edetate, 0.1 part of sodium lauryl sulfate, and 80 parts of water in sequence, and stir Uniform;

[0069] (2) Under normal pressure, control the temperature at 25-30°C, add 2 parts of sulfamic acid, 2 parts of ammonium citrate, 1 part of malic acid, 2 parts of 2,2-dibromo-3-nitrilopropionamide, Stir to dissolve evenly;

[0070] (3) Continue stirring under normal pressure at a temperature of 25-30° C. During the stirring period, analyze the pH value of 2-3, add citric acid to adjust the pH value, and stir for 2 hours to obtain a cleaning agent with a pH value of 2.

[0071] Apply this agent to clean the bromine-extracting brine nanofiltration membrane system, the effect is as follows:

[0072]

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Abstract

The invention discloses a nanofiltration membrane cleaning agent for brine refinement and a preparation method thereof. The nanofiltration membrane cleaning agent is prepared by mixing the following components: 1-20 parts of an alkaline detergent; 0-5 parts of sodium hexametaphosphate; 0-5 parts of ethylenediaminetetraacetic acid; 2-40 parts of an acid cleaning agent; 0.1-1 part of a surfactant; 0.5-5 parts of a bactericide; and 80-200 parts of water. In a reactor with a stirring function, the alkaline cleaning agent, a dispersant, a chelating agent and the surfactant are added to the water according to the parts, and a mixture is evenly stirred; under normal temperature and normal pressure, the acidic cleaning agent and the bactericide are sequentially added, and the materials are uniformly stirred and dissolved, the materials are continuously stirred for 2 to 4 hours, the pH value is analyzed during stirring, and the pH value is adjusted between 2 and 8 by using ammoniacal liquor orcitric acid. The nanofiltration membrane cleaning agent mainly aims at the pollution of the nanofiltration membrane under a high-salt complex brine system, and can effectively clean the surface pollutant of the nanofiltration membrane, the cleaning effect is better, the cleaning agent can be saved, at the same time, the retention of calcium and magnesium in the cleaning process is stable, and thecleaning agent is also suitable for the cleaning of concentrated seawater or brine nanofiltration membrane pollutant with high calcium and magnesium ions.

Description

technical field [0001] The invention relates to the field of water treatment agents, in particular to nanofiltration membrane cleaning agents in brine, concentrated seawater or brine systems containing relatively high calcium and magnesium ions. It has better cleaning effect, less cleaning agent, and can ensure stable calcium and magnesium retention rate during cleaning. technical background [0002] Nanofiltration membrane cleaning agent for brine purification is a chemical agent used for nanofiltration membrane pollutants in brine, concentrated seawater or brine systems with high calcium and magnesium ions. During the membrane process, through reaction, dissolution, dispersion, chelation, penetration, stripping, and sterilization, the cleaning of nanofiltration membrane pollutants is effectively realized, and the stability of the calcium and magnesium ion retention rate is guaranteed at the same time. [0003] Chinese patent CN104743582B discloses a method and device for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06C02F1/44C02F103/08
CPCB01D65/06C02F1/442C02F2103/08C02F2303/14
Inventor 潘玉强刘建路迟庆峰
Owner CHINA NAT OFFSHORE OIL CORP
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