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Technology for preparing itaconic acid-propenoic acid copolymer from fermented liquid

A technology of acrylic acid copolymer and itaconic acid, which is applied in the field of preparing itaconic acid-acrylic acid copolymer, can solve the problems of poor polymerization effect, large pollution, and small molecular weight of the polymer, and achieve good polymerization effect and low carboxylic acid group content. High and cost-reducing effects

Inactive Publication Date: 2003-11-26
ZIBO MINING GRP
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  • Summary
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AI Technical Summary

Problems solved by technology

Since the hydrolysis of polymaleic anhydride needs to be polymerized in an organic solvent, the pollution is relatively large, and the molecular weight of the domestic polymer is small. Some people have studied the copolymerization of acrylic acid and maleic acid aqueous solution, and the carboxyl group content in the polymer chain is higher than that of polyacrylic acid. Good performance, high chelating calcium and magnesium values, such as calcium chelating value up to 200mg / g, and little pollution, but from the point of view of reactivity rate, acrylic acid is 18.05, maleic acid is 0.0085, the polymerization effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: Pass a certain amount of itaconic acid fermentation broth through a cation exchange column, and then concentrate it under negative pressure to a solid content of 35% itaconic acid solution. Get this solution 300mL and add it to a 500mL four-necked round-bottomed flask. Take sulfuric acid 0.1 g of ferrous iron was added therein for dissolution, and nitrogen gas was passed into it. Dissolve 4g of sodium persulfate and 4g of sodium sulfite in 50mL of water respectively, and add them into the flask at the same time as 70g of acrylic acid at 90°C. The addition is completed within 3 hours, and then stirred for 1 hour. Cooling yielded 392 mL of deep red polymer solution.

[0014] The conversion rate of the obtained polymer solution was 97.8% (based on itaconic acid), and the unpolymerized residual itaconic acid monomer was 2.2%. The obtained polymer has a density of 1.21 g / mL (25°C), a solid content of 42.3%, and a number average molecular weight of 900.

[0015] ...

example 2

[0017] Example 2: Pass a certain amount of itaconic acid fermentation broth through a cation exchange column, then concentrate it under negative pressure to a solid content of 39% itaconic acid solution, take 300mL of this solution and add it to a 500mL four-necked round bottom flask, and pass through into nitrogen. Dissolve 4g of sodium persulfate and 6g of sodium sulfite in 50mL of water respectively, add them into the flask at the same time as 80g of acrylic acid at 70°C, finish the addition within 2 hours, and then stir for 1 hour. Cooling gave 405 mL of light yellow polymer solution.

[0018] The conversion rate of the obtained polymer solution was 99.7% (based on itaconic acid), and the unpolymerized residual itaconic acid monomer was 0.3%. The obtained polymer has a density of 1.19 g / mL (25°C), a solid content of 41.6%, and a number average molecular weight of 2000.

[0019] The test of the chelation value of the obtained polymer: take a certain amount of polymer, the...

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Abstract

The present invention provides technology of preparing itaconic acid-propenoic acid copolymer from fermented liquid. With the fermented liquid for producing itaconic acid via biological fermentationas material, and through ionic exchange, concentration, copolymerization with propenoic acid in the presence of initiator, itaconic acid-propenoic acid copolymer solution is prepared. Using the fermented liquid as initial material can lower the cost greatly, and the free radical polymerization process solves the demerit of hard homopolymerization of itaconic acid. The process has less residual monomer and high conversion rate. The copolymer may be used as scale inhibitor, scale remover, dispersant, detergent assistant, etc.

Description

technical field [0001] The invention relates to the technology of itaconic acid and acrylic acid copolymerization, in particular the technology of preparing itaconic acid-acrylic acid copolymer from fermentation liquid. Background technique [0002] There are few domestic reports on the polymerization method of itaconic acid, and itaconic acid is difficult to homopolymerize as everyone knows. In addition, the high price of itaconic acid limits the development of its use. Such as the invention patent application published on October 14, 1992 in the Chinese Patent Gazette: Itaconic Acid Polymerization Method, application number: 92102091, its technical scheme is: the monomer solution and initiator solution that will be completely neutralized are added to put In the container of water, the itaconic acid polymer can be generated at a high conversion rate at a temperature sufficient for the polymerization reaction, and the conversion rate is relatively high, but the cost increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/04
Inventor 赵立新董风波马长友
Owner ZIBO MINING GRP
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