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Method for preparing biodegradable water treatment agent PECS

A technology of polyepoxy sulfocarboxylate and water treatment agent, which is applied in the field of water treatment, can solve the problem that the corrosion and scale inhibition performance cannot reach the use effect of multi-component copolymer, and limit the popularization and application of environment-friendly scale inhibitor and dispersant. Simple and other problems, to achieve the effect of good scale inhibition and dispersion performance

Active Publication Date: 2007-06-06
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of these two agents have good biodegradability, but due to their simple structure and simple functional groups, the application of the products is limited, especially in circulating cooling water systems under the conditions of high alkali, high hardness, high temperature, and high pH. The anti-corrosion and anti-scaling performance of the multi-component copolymer is not as good as that of the multi-component copolymer, thus limiting the popularization and application of environmentally friendly anti-scaling and dispersing agents

Method used

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  • Method for preparing biodegradable water treatment agent PECS

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 7 g of isopropanol to 98 g of sodium bisulfite aqueous solution (concentration: 40%) under stirring, and add 25 g of epichlorohydrin dropwise at 85° C., and the reaction time is 2 hours. Cool down to 40°C, add 42g of 40% sodium hydroxide under cooling and stirring, remove 15g of liquid by distillation under reduced pressure, then add 135g of sodium epoxysuccinate aqueous solution (concentration is 25%) and 1g of barium chloride to control the pH The value was 14, and reacted at 70° C. for 5 hours to obtain a yellow-brown viscous solution of sodium polyepoxysulfonate with a solid content of not less than 30%.

Embodiment 2

[0024] 20 g of isopropanol was added to 84 g of sodium bisulfite aqueous solution (concentration: 40%) under stirring, and 25 g of epichlorohydrin was added dropwise at 65° C., and the reaction time was 3 hours. Cool down to 40°C, add 42g of 40% sodium hydroxide under cooling and stirring, remove 15g of liquid by distillation under reduced pressure, then add 135g of sodium epoxysuccinate aqueous solution (concentration is 25%) and 1g of barium chloride to control the pH The value was 12, and reacted at 80° C. for 4 hours to obtain a yellow-brown viscous solution of sodium polyepoxysulfonate with a solid content of not less than 30%.

Embodiment 3

[0026] 15 g of isopropanol was added to 80 g of sodium bisulfite aqueous solution (concentration: 40%) under stirring, and 25 g of epichlorohydrin was added dropwise at 85° C., and the reaction time was 2 hours. Cool down to 40°C, add 42g of 40% sodium hydroxide under cooling and stirring conditions, remove 15g of liquid by distillation under reduced pressure, then add 135g of sodium epoxysuccinate aqueous solution (concentration is 25%) and 1g of strontium nitrate to control the pH value 10, and reacted at 90°C for 3 hours to obtain a yellow-brown viscous solution of sodium polyepoxysulfonate with a solid content of not less than 30%.

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Abstract

A method for preparing the water treating agent ployepoxide sulfonic carboxylic acid of biodegradable, with the characteristics being: employing epichlorohydrin and bisulfate with molar ratio being 1:1-1:1.5 as raw material, synthesing intermediate compound under action of phase transition catalyst alcohol isopropylicum with its consumption being 1-20% of that of total reactant and nitrogen, the intermediate compound without separation directly polymerizing with epoxide succinic acid under the catalytic action of rare-earth metal catalyst such as Ba and Sr with its consumption being 0.1-1% of that of total reactant and getting the ployepoxide sulfonic carboxylic acid or its salt solution.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a biodegradable and environment-friendly water treatment agent polyepoxysulfonic acid. Background technique [0002] In the field of water treatment technology, although the early chromium-based formulations were used with good results, they were eventually banned at home and abroad due to the high toxicity of chromate. The traditional inorganic phosphate formula caused the eutrophication of the water body due to the hydrolysis of phosphate, and together with the phosphorus detergent, it caused the phenomenon of "red tide" in domestic and foreign waters, which brought great pollution to water resources, and a worldwide Phosphorous exercise is prohibited. At present, most of the polymers in the phosphorus-based alkaline water treatment formula and the all-organic formula that occupy the dominant position in my country's water treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/08C08G59/20
Inventor 靳晓霞胡兴刚孙继滕厚开
Owner CHINA NAT OFFSHORE OIL CORP
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