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Method for preparing sodium polyacrylate dispersant

A technology of sodium polyacrylate and acrylic acid, applied in the field of polymers, can solve the problems of high cost of acrylic acid aqueous solution treatment, and achieve the effects of avoiding uneven molecular weight and low production cost

Active Publication Date: 2014-02-05
重庆紫光合盛建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it takes 200-300NM3 natural gas to incinerate 1 ton of low-concentration acrylic acid aqueous solution, which shows that the treatment cost of acrylic acid aqueous solution is very expensive.

Method used

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  • Method for preparing sodium polyacrylate dispersant

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preparation example Construction

[0019] The embodiment of the present invention discloses a preparation method of sodium polyacrylate dispersant, comprising the following steps:

[0020] mixing the first acrylic acid waste liquid and the chain transfer agent, heating, then adding the initiator and the second acrylic acid waste liquid dropwise, and reacting to obtain a reaction product;

[0021] The pH of the reaction product is adjusted with solid sodium hydroxide to obtain a sodium polyacrylate dispersant.

[0022] In the process of preparing the sodium polyacrylate dispersant in the present invention, firstly, the first acrylic acid waste liquid and the chain transfer agent are mixed and then heated, so that the first acrylic acid waste liquid and the chain transfer agent are evenly mixed. The concentration of the first acrylic acid waste liquid is preferably 3wt%-9wt%, and the addition amount of the first acrylic acid waste liquid is 10wt%-20wt of the total amount of the first acrylic acid waste liquid and...

Embodiment 1

[0032] Add 100ml of acrylic acid wastewater with a content of 5wt% into a 1500ml three-necked flask, add 5g of sodium methacrylate, and heat to 70°C. Start stirring, slowly add 900ml of 5wt% acrylic acid wastewater and 50ml of 5wt% ammonium persulfate dropwise; the dropping time is controlled at 1h, and the temperature is controlled for 0.5h after the dropping, and the pH value is adjusted to 7-9 with solid sodium hydroxide , to obtain the reaction solution. The molecular weight of the reaction solution was measured, and the viscosity-average molecular weight distribution was 1500-3000. The reaction solution was concentrated by evaporation to 200ml, and the measured solid content was 42%, and the conversion rate of acrylic acid was 98%.

Embodiment 2

[0034] Add 200ml of acrylic acid wastewater with a content of 5wt% into a 1500ml three-necked flask, add 5g of sodium methacrylate, and heat to 80°C. Start stirring, and slowly add 800ml of 5wt% acrylic acid wastewater and 50ml of 5wt% ammonium persulfate dropwise; the dropping time is controlled at 1h, and the temperature is controlled for 0.5h after the dropping, and the pH value is adjusted to 7-9 with solid sodium hydroxide , to obtain the reaction solution. The molecular weight of the reaction solution was measured, and the viscosity-average molecular weight distribution was 1500-3000. The reaction liquid was concentrated by evaporation to 200ml, the measured solid content was 42%, and the conversion rate of acrylic acid was 97.6%.

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Abstract

The invention provides a method for preparing a sodium polyacrylate dispersant. The method comprises the following steps of mixing first acrylic waste liquid and a chain transfer agent, heating, dropwise adding an initiator and second acrylic waste liquid, and reacting for obtaining a reaction product; adjusting the pH value of the reaction product by adopting solid sodium hydroxide, thereby obtaining the sodium polyacrylate dispersant. According to the method, during the preparation of the sodium polyacrylate dispersant, the first acrylic waste liquid and the chain transfer agent serve as a base solution, the second acrylic waste liquid and the initiator are dropwise added to the base solution, and a manner that acrylic acid is dropwise added to part of the acrylic waste liquid is adopted, so that the phenomenon that molecular weights are unequal due to violent reaction is avoided; moreover, sodium polyacrylate is prepared from the acrylic waste liquid, so that the waste is recycled, and meanwhile, the production cost of the acrylic waste liquid is reduced.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a preparation method of a sodium polyacrylate dispersant. Background technique [0002] Acrolein is the simplest unsaturated aldehyde and an important chemical intermediate, widely used in the synthesis of acrylic acid, synthetic resin, pharmaceutical intermediates, pesticides and spices. In order to prepare high-purity acrolein in industry, the water absorption process is widely used to purify crude acrolein, and a low-concentration acrylic acid aqueous solution with a concentration of 3-9% will be produced during the purification process; the acrylic acid aqueous solution has a certain calorific value. Moreover, the concentration of organic matter is high, and COD can generally reach more than 100,000. At present, incineration is generally used for treatment to meet the emission standards. However, every ton of low-concentration acrylic acid aqueous solution needs to consume ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F2/38C08F4/30C09D7/12
Inventor 孙文兵乐金波柳亚玲肖雷刘丹
Owner 重庆紫光合盛建材有限公司
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