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Reverse osmosis membrane scale inhibitor and application thereof

A technology of reverse osmosis membrane and scale inhibitor, which is applied to the reverse osmosis membrane scale inhibitor and its application field in the reverse osmosis water treatment process, can solve the problem that the scale inhibitor is difficult to meet the needs of production, and achieve stable CaCO3 , the effect of improving work efficiency and reducing costs

Active Publication Date: 2012-04-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The common feature of the above scale inhibitors is that they are all linear compounds, which are only suitable for raw water with low silica content, CaSO 4 and CaCO 3 A reverse osmosis system with a low fouling tendency, while for a raw water with a high content of silica, CaSO 4 Scaling tendency is serious and CaCO needs to be considered 3 In the case of scaling, the application of this type of antiscalant is difficult to meet the needs of production

Method used

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  • Reverse osmosis membrane scale inhibitor and application thereof
  • Reverse osmosis membrane scale inhibitor and application thereof
  • Reverse osmosis membrane scale inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Weigh 20g of dendrimers, the limiting viscosity is 0.07dL g -1 (measured at 30°C, the same below), 6.67g of acrylic acid / acrylamide copolymer (the mass ratio of acrylic acid / acrylamide is 2:1) with a solid content of 30%, 8g of hydroxyethylidene diphosphonic acid with a solid content of 50% , dissolved in 5.33g of water, made into antiscalant 1 for reverse osmosis membrane. Dosing reverse osmosis membrane antiscalant 1 in test water 2, the dosing concentration is 40mg·L -1 . The effective concentration of dendrimers is 20mg L -1 , the effective concentration of acrylic acid / acrylamide copolymer is 2mg·L -1 , the effective concentration of hydroxyethylidene diphosphonic acid is 4mg·L -1 .

Embodiment 2

[0057] Weigh 30g of dendrimers, the limiting viscosity is 0.07dL g -1 10g of acrylic acid / acrylamide copolymer (the mass ratio of acrylic acid / acrylamide is 2:1) with a solid content of 30%, 2-phosphonic acid group-1,2,4-tricarboxylic acid butyl with a solid content of 50% Alkanes 6g, dissolved in 4g of water, made into reverse osmosis membrane scale inhibitor 2. Dosing reverse osmosis membrane antiscalant 2 in test water 2, the dosing concentration is 50mg·L -1 . The effective concentration of dendrimers is 30mg L -1 , the effective concentration of acrylic acid / acrylamide copolymer is 3mg·L -1 , The effective concentration of 2-phosphono-1,2,4-tricarboxylic acid butane is 3mg L -1 .

Embodiment 3

[0059] Weigh 40g of dendrimers, the limiting viscosity is 0.07dL g -1 13.33g of acrylic acid / acrylamide copolymer (the mass ratio of acrylic acid / acrylamide is 2:1) with a solid content of 30%, 4g of polyether-based polyaminomethylene phosphonic acid with a solid content of 50%, dissolved in 2.67 g water, made into reverse osmosis membrane antiscalant 3. Dosing reverse osmosis membrane antiscalant 3 in test water 1, the dosing concentration is 60mg·L -1 . The effective concentration of dendrimers is 40mg L -1 , the effective concentration of acrylic acid / acrylamide copolymer is 4mg·L -1 , the effective concentration of polyether-based polyaminomethylenephosphonic acid is 2mg·L -1 .

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Abstract

The invention relates to a reverse osmosis membrane scale inhibitor and an application thereof. The scale inhibitor is composed of a component a, a component b and a component c. The component a comprises a dendrimer with a structural formula as the following. The component b is acrylic acid / acrylamide copolymer. The component c comprises at least one substance selected from organic phosphonic acid and / or organic carboxylic acid polymers. When the composite scale inhibitor provided by the invention is applied in water treatment employing a reverse osmosis system, a problem of SiO2, silicate, and CaSO4 depositions on the reverse osmosis membrane can be solved, and CaCO3 can be stabilized. With the scale inhibitor, membrane pollution caused by SiO2, silicate, CaSO4 and CaCO3 depositions can be effectively eliminated; working efficiency of the reverse osmosis membrane system can be improved; service lives of the reverse osmosis membrane and reverse osmosis equipments can be prolonged; and reverse osmosis cost can be reduced.

Description

technical field [0001] The invention relates to a scale inhibitor and its application, in particular to a reverse osmosis membrane scale inhibitor and its application in the process of reverse osmosis water treatment. Background technique [0002] In 1953, Reid et al. of the University of Florida first proposed reverse osmosis seawater desalination. 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 membrane modules has also sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
CPCC23F14/02
Inventor 郦和生谢文州王亭
Owner CHINA PETROLEUM & CHEM CORP
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