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A kind of preparation method and application of reverse osmosis phosphorus-free scale inhibitor with network structure

A technology of phosphorus-free scale inhibitor and network structure, which can be used in chemical instruments and methods, semi-permeable membrane separation, descaling and water softening, etc. , Difficult to clean and other problems, to achieve high calcium tolerance, excellent dispersion performance, and excellent scale inhibition performance

Active Publication Date: 2022-08-02
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing reverse osmosis antiscalants on the market are difficult to meet the osmotic requirements of the above-mentioned water quality, especially when phosphorus-containing antiscalants are used, it accelerates the growth of microorganisms and increases the microbial contamination of the membrane system. Once the above pollutants exist, The reverse osmosis membrane is very easy to be fouled, and it is difficult to clean after fouling, which causes some systems to be cleaned once every 1 to 2 months, and some systems even have to be cleaned every half a month. A lot of manpower and material resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The reverse osmosis phosphorus-free scale inhibitor 1# with a network structure is prepared by the following steps:

[0027] (1) Using polyaspartic acid, diethylenetriamine, and crosslinking agent (acrylic acid) as raw materials, the raw materials are mixed evenly in water (10 times the total amount of raw materials), wherein polyaspartic acid, diethylene The mass ratio of triamine and crosslinking agent is 2:1:0.2, and then an appropriate amount of concentrated sulfuric acid catalyst is added. The mass ratio of inorganic acid catalyst and raw material is 1:10, and the reaction is carried out at a reaction temperature of 180-200 ° C for 6 hours. After the reaction is completed, the reaction product is dissolved in ultrapure water, and the supernatant is taken after centrifugation;

[0028] (2) supernatant is added in the organic solvent, under the condition of adjusting pH=2-3 with hydrochloric acid, the reaction intermediate is precipitated and separated by the organic...

Embodiment 2

[0032] The reverse osmosis phosphorus-free scale inhibitor 2# with a network structure is prepared by the following steps:

[0033] (1) Using polyaspartic acid, diethylenetriamine, and crosslinking agent (methacrylic acid) as raw materials, the raw materials are mixed uniformly in water (15 times the total amount of raw materials), wherein polyaspartic acid, The mass ratio of diethylenetriamine and crosslinking agent is 2:1:0.1, and then an appropriate amount of concentrated sulfuric acid catalyst is added. The mass ratio of inorganic acid catalyst and raw material is 0.1:10, and the reaction is carried out at a reaction temperature of 180-210 °C. 4h, after the reaction is completed, the reaction product is dissolved in ultrapure water, and the supernatant is taken after centrifugation;

[0034] (2) supernatant is added in the organic solvent, under the condition of adjusting pH=2-3 with hydrochloric acid, the reaction intermediate is precipitated and separated by the organic ...

Embodiment 3

[0038] The reverse osmosis phosphorus-free scale inhibitor 2# with a network structure is prepared by the following steps:

[0039] (1) Using polyglutamic acid, diethylenetriamine, and crosslinking agent (hydroxyethyl acrylate) as raw materials, the raw materials are mixed evenly in water (10 times the total amount of raw materials), wherein polyglutamic acid, diethylene The mass ratio of ethylene triamine and cross-linking agent is 2:1:0.1, and then an appropriate amount of concentrated sulfuric acid catalyst is added. The mass ratio of inorganic acid catalyst and raw material is 0.01:10, and the reaction is carried out at a reaction temperature of 180-210 ° C for 4.5 h, after the reaction is completed, the reaction product is dissolved in ultrapure water, and the supernatant is taken after centrifugation;

[0040] (2) supernatant is added in the organic solvent, under the condition of adjusting pH=2-3 with hydrochloric acid, the reaction intermediate is precipitated and sepa...

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Abstract

The invention provides a reverse osmosis phosphorus-free scale inhibitor with a network structure, which is characterized in that: after the polyamino acid-diethylenetriamine copolymer is obtained by the copolymerization reaction of polyamino acid and diethylenetriamine, the polyamino acid-diethylenetriamine copolymer is mixed with citric acid. Continue the reaction to obtain a reverse osmosis phosphorus-free scale inhibitor with a network structure. The reverse osmosis phosphorus-free scale inhibitor can be used in high hardness, high alkalinity and low pH environments, and has excellent scale inhibition performance against calcium carbonate, calcium phosphate and calcium sulfate, and can effectively inhibit the formation of silicon scale, showing good performance. synergy.

Description

technical field [0001] The invention relates to a reverse osmosis scale inhibitor, in particular, to a preparation method and application of a reverse osmosis phosphorus-free scale inhibitor with a network structure. Background technique [0002] In the industrial production process, the circulating cooling water system is a frequently used water circulating system. However, water evaporation, temperature increase, pH change, water flow rate change, etc. occur during the recycling process. In addition, the water often contains alkaline earth metal cations, such as Ca 2+ , Mg 2+ , Ba 2+ and other small amounts of cations, etc. These cations interact with water anions (CO 3 2- , SO 4 2- , PO 4 3- , SiO 3 2- , HCO 3 - , OH - etc.) generate insoluble / slightly soluble inorganic salts (such as CaCO 3 , CaSO 4 , Ca 3 (PO 4 ) 2 , Mg(OH) 2 etc.), and then fouling on the surface of heat exchangers or pipes, resulting in lower heat transfer efficiency. The use of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/12B01D65/08
CPCC02F5/12B01D65/08
Inventor 张金山夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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