Reverse osmosis membrane scale inhibitor

A scale inhibitor and reverse osmosis technology, applied in the field of water treatment chemicals, can solve the problems of pollutant pollution of membrane devices, and achieve the effects of environmental friendliness, long storage period and good stability

Active Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the pollution of the membrane device by pollutants during operation, CaCO is generated on the surface 3 , Ca 3 (PO 4 ) 2 , CaSO 4 , BaSO ...

Method used

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  • Reverse osmosis membrane scale inhibitor
  • Reverse osmosis membrane scale inhibitor
  • Reverse osmosis membrane scale inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 70g of water into a flask equipped with a stirring device, start stirring, then add 8g of polylactic acid with a molecular weight of 2500, and 22g of acetic acid and phosphonic acid in sequence, and mix evenly after about 30 minutes, stop stirring, and obtain the scale inhibitor sample YP1 of the present invention . Its pH is 1.6 and its solid content is 30 wt%.

Embodiment 2

[0028] Add 50 g of water into a flask equipped with a stirring device, start stirring, then add 5 g of polylactic acid with a molecular weight of 3500, and 45 g of hydroxyethylidene diphosphonic acid in sequence, and mix evenly after about 30 minutes, stop stirring, and obtain the scale inhibitor of the present invention agent sample YP2. Its pH is 1.3 and its solid content is 50 wt%.

Embodiment 3

[0030] Add 55g of water into a flask equipped with a stirring device, start stirring, then add 10g of polylactic acid with a molecular weight of 35,000, and 35g of (1,2,4-tricarboxy-2-phosphonobutane) successively, and it will be ready after about 30 minutes. Mix evenly, stop stirring, and obtain the antiscalant sample YP3 of the present invention. Its pH is 1.2 and its solid content is 45% by weight.

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Abstract

Provided is a reverse osmosis membrane scale inhibitor which comprises polylactic acid having a molecular weight of 1000 to 5000, organic phosphonic acid scale inhibitors and water. The components of the reverse osmosis membrane scale inhibitor are 5 to 15 wt% of polylactic acid and 5 to 80 wt% of organic phosphonic acid scale inhibitors, with the balance being water. The scale inhibitor is a transparent aqueous solution with a pH smaller than 6.0 and a solid content of 20 to 60%. Application concentration of the scale inhibitor is 1 to 100 mg/L; the scale inhibitor can simultaneously preventthe formation of positive colloid sediments like CaCO3, CaSO4, Ca3(PO4)2, BaSO4, SrSO4 and metal oxides, and is applicable under the occasion that a saturation index (LIS) is less than 6.0.

Description

technical field [0001] The invention relates to a water treatment agent, in particular to a reverse osmosis membrane scale inhibitor. Background technique [0002] Chinese patent CN200810139161.3 (CN101352655) invented the antiscalant of reverse osmosis membrane, and the components by weight percentage are: organic phosphonic acid 25-50%, sulfonate copolymer 20-40%, pH regulator 5-15% , and the rest is deionized water; its preparation method is to add deionized water, pH regulator, organic phosphoric acid and sulfonate copolymer into the container in sequence, and stir at room temperature for 1 to 1.5 hours to obtain the product. Used in a wide pH range of feed water, it has good stability to calcium ion concentration, alkalinity, and metal ions such as iron and manganese, and can simultaneously and effectively control CaCO 3 , CaSO 4 , BaSO 4 , SrSO 4 , CaF 2 , SiO 2 Equivalent to scale; non-corrosive compared with acid, and safe to operate; compatible with commonly u...

Claims

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Application Information

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IPC IPC(8): C02F5/14
Inventor 张英雄曹宗仑平春霞邢琳邢毅马友富
Owner CHINA PETROLEUM & CHEM CORP
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