Method for synthesizing hydrolytic polymaleic anhydride

A technology of polymaleic anhydride and synthesis method, which is applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve the problems that water treatment chemicals cannot reach, and achieve the protection of natural ecology Excellent environment, scale inhibition and dispersion performance, and wide application fields

Inactive Publication Date: 2015-05-27
JIANGSU JIANGHAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of scale formation in circulating cooling water, oil field water injection and various low-pressure boiler water, and provides a scale inhibitor dispersant capable of effectively dispersing chelated calcium and magnesium ions, which is used to overcome the inability of existing water treatment agents to Achieve the solution effect to meet the needs of the current market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put maleic anhydride and hydrogen peroxide into the reactor according to the calculated molar ratio of 1.3:1, and then heat it. When the temperature rises to 60°C, add 2ppm of the screened catalyst into the reactor, and continue heating to the dropping temperature 60°C; start to add hydrogen peroxide dropwise, and the dropping rate should be controlled at 62.5ml / h. It is required to be stable and uniform, and should not be too fast, so as to ensure the generation of sufficient hydroxyl radicals. The dropping time should be controlled for 4 hours; after the addition of hydrogen peroxide is completed , start to keep the material warm, and keep warm for 2 hours to ensure that the reaction is fully carried out and the hydrogen peroxide is fully decomposed; necessary bleaching, cooling, testing, and discharging are carried out, and finally a reddish-brown transparent liquid is obtained.

Embodiment 2

[0018] Put maleic anhydride and hydrogen peroxide into the reactor according to the calculated molar ratio of 1.3:1, and then heat it. When the temperature rises to 60°C, add 4ppm of the screened catalyst into the reactor, and continue heating to the dropping temperature 60°C; start to add hydrogen peroxide dropwise, and the dropping rate should be controlled at 62.5ml / h. It is required to be stable and uniform, and should not be too fast, so as to ensure the generation of sufficient hydroxyl radicals. The dropping time should be controlled for 4 hours; after the addition of hydrogen peroxide is completed , start to keep the material warm, and keep warm for 2 hours to ensure that the reaction is fully carried out and the hydrogen peroxide is fully decomposed; necessary bleaching, cooling, testing, and discharging are carried out, and finally a reddish-brown transparent liquid is obtained.

Embodiment 3

[0020] Put maleic anhydride and hydrogen peroxide into the reactor according to the calculated molar ratio of 1.3:1, and then heat it. When the temperature rises to 60°C, add 8ppm of the screened catalyst into the reactor, and continue heating to the dropping temperature 60°C; start to add hydrogen peroxide dropwise, and the dropping rate should be controlled at 62.5ml / h. It is required to be stable and uniform, and should not be too fast, so as to ensure the generation of sufficient hydroxyl radicals. The dropping time should be controlled for 4 hours; after the addition of hydrogen peroxide is completed , start to keep the material warm, and keep warm for 2 hours to ensure that the reaction is fully carried out and the hydrogen peroxide is fully decomposed; necessary bleaching, cooling, testing, and discharging are carried out, and finally a reddish-brown transparent liquid is obtained.

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PUM

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Abstract

The invention discloses a method for synthesizing polymaleic anhydride with a high molecular weight in a water phase. The method comprises the following steps: adding quantitative water and solid polymaleic anhydride into a reactor, heating to a certain temperature, adding a catalyst, heating further until the temperature reaches a process required range, and dropwise adding hydrogen peroxide, wherein the addition amount of hydrogen peroxide needs to be controlled reasonably to ensure that enough hydroxyl radicals can be provided and the generation of a large amount of dissolved oxygen in the product can be prevented. The polymaleic anhydride synthesized by adopting the method has molecular weight of 800-1,000, can be fully dissolved in water, is high in chemical stability and decomposition resisting temperature and can be applied to circulating cooling water to disturb and destroy scale forming substances and disperse precipitates effectively and has strong precipitate dispersion effect, so that the scale forming substances and the sludge can be fluidized and discharged out of a system easily. The dispersion effect of polymaleic anhydride is 2 to 3 times that of the traditional polymaleic anhydride.

Description

technical field [0001] The invention relates to a water treatment field applied to open circulating cooling water, oilfield water injection systems, water delivery pipelines, and various low-pressure boilers. Specifically, it relates to the research on the preparation method and application of a kind of polymer water method polymass. Background technique [0002] With the development of modern industry, the water consumption in the industrial production process is increasing day by day, and higher requirements are put forward for the chemical treatment agent of industrial circulating cooling water. Since the development of hydrolyzed polymaleic anhydride in the 1970s, its unique performance of inhibiting calcium carbonate and calcium phosphate has been valued by people, and people's research on it has become more and more common, but the current technology is limited to Polymers with a polymerization degree of 3-5 are low in molecular weight and poor in performance, and can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60C02F5/14
CPCC07D307/60C02F5/10
Inventor 吴林华吴文导徐群
Owner JIANGSU JIANGHAI CHEM
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