Preparation method of polymaleic acid

A technology of polymaleic acid and maleic anhydride, applied in the field of preparation of polymaleic acid, can solve problems such as low bromine value of polymaleic acid products, and achieve the advantages of short polymerization reaction time, low production cost and stable product quality. Effect

Active Publication Date: 2009-11-11
安徽海瀚水处理科技有限公司
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  • Application Information

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Problems solved by technology

Beijing University of Chemical Technology uses hydrogen peroxide as the initiator and water as the solvent. The obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1. Take maleic anhydride (MA) 30g, distilled water 36g, transition metal ion M 2+ Put 4.5g of the mixture composed of the complex and ammonium salt into the reactor at one time, and heat it to 40°C; then, under the condition of constant stirring, slowly add hydrogen peroxide to initiate polymerization, control the polymerization reaction temperature at 90°C, and keep warm for 1-2 hours, the average molecular weight is greater than polymaleic acid (HPMA) above 5500, and the product is a brownish-red transparent liquid.

Embodiment 2

[0012] Example 2. Take maleic anhydride (MA) 32g, distilled water 42.6g, transition metal ion M 2+ 5.7g of the mixture composed of the compound and the ammonium salt was put into the reactor at one time and heated to 50°C; then, under the condition of constant stirring, hydrogen peroxide was slowly added to initiate polymerization, the polymerization reaction temperature was controlled at 95°C, and the reaction was kept for 1.5 hours. That is to obtain polymaleic acid (HPMA) with an average molecular weight greater than 5500, and the product is a brownish-red transparent liquid.

Embodiment 3

[0013] Example 3. Take maleic anhydride (MA) 35g, distilled water 49g, transition metal ion M 2+ Put 7g of the mixture composed of the compound and the ammonium salt into the reactor at one time, and heat it to 60°C; then, under the condition of constant stirring, slowly add hydrogen peroxide to initiate polymerization, control the polymerization reaction temperature at 100°C, and keep it warm for 2 hours, that is Obtain polymaleic acid (HPMA) with an average molecular weight greater than 5500, and the product is a brownish-red transparent liquid.

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Abstract

The invention discloses a preparation method of polymaleic acid, belonging to the field of chemical technology and aiming at providing a preparation method of polymaleic acid with high product yield, low bromine number and stable quality, and meanwhile, the polymaleic acid average molecular weight of which is more than 5500 is suitable for commercial process. The preparation method has the technical key points that 1 part by weight of maleic anhydride, 1.2 to 1.4 parts by weight of distilled water and 0.015 to 0.02 parts by weight of mixture of transition metal ion M compound and ammonium salt are put into a reaction kettle once to be heated from 40 to 60 DEG C to be totally dissolved; then perhydrol is slowly added to polymerize under the condition of continuous stirring, polymerization reaction temperature is controlled to be 90 to 100 DEG C, and heat preservation reaction time is 1 to 2 hours, so that the polymaleic acid whose average molecular weight is bigger than 5500 can be obtained. The yield can be more than 99.0% (counted by maleic anhydride), bromine number is smaller than 30mg/g, and products have stable quality. The preparation method for polymaleic acid has environmentally-friendly and clean technology, produces no three wastes and has the advantages of convenient operation and low production cost, thus the preparation method of polymaleic acid is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of polymaleic acid, which belongs to the technical field of chemical industry. Background technique [0002] Polymaleic acid (HPMA), commonly known as hydrolyzed polymaleic anhydride, is a water treatment agent and high-efficiency dispersant with excellent performance and a wide range of uses. [0003] At present, the preparation of polymaleic acid: one is radiation polymerization. This method uses cobalt 60 to irradiate maleic anhydride to make it polymerize and obtain polymaleic anhydride. This is the earliest method for the preparation of polymaleic anhydride. First developed by Lang Pavelich and Clayey in 1961, the molecular weight of polymaleic anhydride produced is 19500, and the conversion rate is 5%. They broke through the forbidden zone of homopolymerization of maleic anhydride, changed people's long-term belief that maleic anhydride can only be copolymerized with other monomers, but not homopol...

Claims

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Application Information

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IPC IPC(8): C08F122/02C08F4/30C08F4/22
Inventor 邢献军
Owner 安徽海瀚水处理科技有限公司
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