Method for synthesizing polyepoxysuecinic acid salt

A technology of polyepoxysuccinate and epoxysuccinate, which is applied in the field of synthesis of polyepoxysuccinate, can solve the problems of many by-products, low quality of synthetic PESA, and high price of raw materials, so as to overcome the problem of polymerization The degree is not high, which is beneficial to the polymerization reaction and improves the effect of scale inhibition efficiency
CN101538362AInactive Publication Date: 2009-09-23北京合创同盛科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
北京合创同盛科技有限公司
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a method for synthesizing a polyepoxysuecinic acid salt, which is characterized by comprising the following steps of: dissolving maleic anhydride in deionized water; adding a solution of sodium hydroxide at 30 to 60 DEG C with stirring; adding sodium tungstate and hydrogen peroxide when the temperature is controlled to be between 60 to 100 DEG C; adjusting the pH value to 5 to 7 for reaction for 2 to 100 hours; cooling the reaction solution to below 20 DEG C; adding a precipitator, mixing and stirring the precipitator and the solution; performing suction filtration, adding water into filtrate obtained after suction filtration; keeping the pH value between 6 and 7; heating the filtrate added with water to 70 to 100 DEG C to obtain an epoxysuecinic acid salt; preparing a 0.2 to 4.0 mol / L aqueous solution of the epoxysuecinic acid salt; adding calcium hydroxide and a polymerization promoter into the aqueous solution for performing polymerization reaction till liquid turns yellowish and pasty; and cooling the yellowish and pasty liquid to room temperature to obtain the polyepoxysuccinic acid salt. The method has the advantages of good product quality, low raw material cost and product scale inhibition performance advantageous over that of the prior art.
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Description

technical field

[0001] The present invention relates to a kind of synthesis method of polyepoxysuccinate, more particularly relates to the synthesis method of the polyepoxysuccinate used for water treatment. Background technique

[0002] Polyepoxysuccinic acid (PESA) is a new generation of green and environmentally friendly water treatment agent developed in the 1990s. It is a green scale inhibitor with the characteristics of no phosphorus, no nitrogen, good biodegradability and suitable for high alkali and high solid water systems. Its antiscalant effect is significantly better than that of commonly used organic phosphonic acid antiscalants.

[0003] USP3776850 reported a method for boron trifluoride catalyzed polymerization of diethyl epoxy succinate and saponification to synthesize polyepoxy succinate.

[0004] USP4654159 discloses the preparation process of polyepoxysuccinic acid. The process is based on maleic anhydride as raw material. Sodium phosphate is used as a c...

Claims

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