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Anti-scaling agent of reverse osmosis membrane, and application thereof

A technology of reverse osmosis membrane and compound scale inhibitor, applied in semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, membrane technology, etc., can solve the problem of low calcium-alkali tolerance, reduce costs and prolong service life , the effect of high tolerance

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it has low tolerance to calcium and alkali, and is not suitable for high hardness and high alkali water quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Get effective content and be 30% glycine dimethylene phosphonic acid 16.7g; Effective content is 50% 2-phosphonic acid group-1,2,4-tricarboxylic acid butane 4g, be dissolved in 29.3g water, be made into trans Antiscalants for permeable membranes. Dosing the antiscalant for reverse osmosis membrane in the test water, the dosing concentration is 50mg / L, wherein the effective concentration of glycine dimethylene phosphonic acid is 5mg / L, 2-phosphonic acid group-1,2, The effective concentration of 4-tricarboxylic butane is 2mg / L.

Embodiment 2

[0045] Take 10 g of glutamic acid dimethylenephosphonic acid with an effective content of 30%; 6 g of hydroxyethylidene diphosphonic acid with an effective content of 50%, dissolve them in 34 g of water, and prepare a scale inhibitor for reverse osmosis membranes. Dosing anti-scaling agent for the osmotic membrane in the test water, the dosing concentration is 50mg / L, wherein the effective concentration of glutamic acid, methylene phosphonic acid is 3mg / L, and the dosing of hydroxyethylidene diphosphonic acid The effective concentration is 3mg / L.

Embodiment 3

[0047] Take 6.7 g of leucine dimethylene phosphonic acid with an effective content of 30%; 10 g of amino trimethylene phosphonic acid with an effective content of 50%, dissolve them in 33.3 g of water, and prepare a scale inhibitor for reverse osmosis membranes. Dosing the scale inhibitor for reverse osmosis membrane in the test water, the dosing concentration is 50mg / L, wherein the effective concentration of leucine methylene phosphonic acid is 2mg / L, and the dosing of amino trimethylene phosphonic acid The effective concentration is 5mg / L.

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PUM

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Abstract

The invention relates to a composite anti-scaling agent of a reverse osmosis membrane, and an application thereof. The composite anti-scaling agent comprises a component a and a component b, wherein the component a comprises at least one selected from methylene phosphonic carboxylic acid, the general formula of the component a is RCH(COOH)N(CH2PO3H2)2, the RCH(COOH)N is selected from an amino acid, the component b comprises at least one material selected from an organic phosphonic acid polymer and / or an organic carboxylic acid polymer. With adopting the composite anti-scaling agent of the present invention to carry out water treatment for a reverse osmosis system, the problems of CaCO3 deposition and CaSO4 deposition on the reverse osmosis membrane can be solved, the membrane pollution due to the CaCO3 deposition and the CaSO4 deposition can be eliminated, the work efficiency of the reverse osmosis system can be improved, the service lives of the reverse osmosis membrane and the reverse osmosis equipment can be prolonged, and the reverse osmosis cost can be reduced.

Description

technical field [0001] The invention relates to a composite scale inhibitor and its application, in particular to a reverse osmosis membrane composite scale inhibitor and its application in reverse osmosis water treatment process. Background technique [0002] In 1953, Reid et al. of the University of Florida first proposed reverse osmosis seawater desalination technology. In 1960, Loeb and Sourirajan of the University of California developed the first practical reverse osmosis membrane. Since then, the development of reverse osmosis membranes has gradually developed. Membrane materials have developed from a single asymmetric cellulose acetate membrane to a cross-linked aromatic polyamide composite membrane made by surface polymerization technology. Operating pressures are also extended to high pressure (desalination) membranes, medium pressure (cellulose acetate) membranes, low pressure (composite) membranes and ultra-low pressure (composite) membranes. The form of membr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/08C02F5/14C02F1/44
Inventor 郦和生王亭
Owner CHINA PETROLEUM & CHEM CORP
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