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Preparation method for polyepoxy sodium succinate for water treatment

A technology of sodium polyepoxysuccinate and water treatment, which is applied in water/sludge/sewage treatment, chemical instruments and methods, descaling and water softening, etc. It can solve the problems of large concentration differences, hydrogen peroxide peroxidation, poor stability, etc. problem, achieve conditional equilibrium, avoid peroxidation, and avoid the effect of sodium tartrate

Active Publication Date: 2011-04-06
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Abstract
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Problems solved by technology

[0009] In our production practice, we found that the use of conventional reactors can easily cause peroxidation caused by local excess of hydrogen peroxide, and produce sodium tartrate as a by-product
In addition, the conventional reactor is operated intermittently, the concentration difference between the early stage and the late stage of the reaction system is large, and the stability of the products produced is poor between different batches.

Method used

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  • Preparation method for polyepoxy sodium succinate for water treatment
  • Preparation method for polyepoxy sodium succinate for water treatment

Examples

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Embodiment 1

[0026] Add 220 kg of maleic anhydride and 240 kg of water into the reaction kettle and stir; add 560 kg of 40% sodium hydroxide dropwise, neutralize the temperature below 60°C, and adjust the pH to about 6.5; add 5 kg of sodium molybdate and tungsten A mixture of sodium bicarbonate; heat up to 65°C, make the material in the kettle and 280 kg of hydrogen peroxide with a concentration of 30% enter the tubular reactor in equal proportions to start the circulation of the material in the kettle; the cyclization time is 1.5 hours, and the cyclization is completed and used in the regulating kettle Adjust the pH to about 6.5 with sodium hydroxide; keep it warm for 1 hour; raise the temperature to 95°C, add about 15 kg of calcium hydroxide, add in two times, and adjust the pH to 10.8 with sodium hydroxide at the same time; pump the reaction mixture into the tube In the reactor, the diameter of the tube reactor is Φ80cm, the tube length is 80m, and the tube reactor is kept warm for 40 ho...

Embodiment 2

[0028] Add 245 kg of maleic anhydride and 220 kg of water into the reaction kettle and stir; add 520 kg of 40% sodium hydroxide dropwise, neutralize at 50°C, and adjust the pH to about 6.5; add 10 kg of sodium molybdate catalyst; When the temperature reaches 65°C, turn on the circulation pump, so that the materials in the kettle and 300 kg of hydrogen peroxide with a concentration of 40% enter the tubular reactor in equal proportions to start the circulation of the materials in the kettle; the cyclization time is 1.0 hours, and after the cyclization is completed, use sodium hydroxide to adjust the pH at About 6.5; keep warm for 1 hour; heat up to 90°C, add about 20 kg of calcium hydroxide, add in two times, and adjust pH = 10 with sodium hydroxide at the same time; pump the reaction mixture into the tubular reactor, the tubular reactor The diameter of the reactor is Φ50cm, the length of the tube is 120m, and the tube reactor is kept warm for 60 hours. Add decolorizer, keep war...

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Abstract

The invention relates to a preparation method for polyepoxy sodium succinate for water treatment. Maleic anhydride is hydrolyzed in water and alkaline environment; then one or two of sodium tungstate and sodium molybdate and hydrogen peroxide react in a tube-type reactor to generate epoxy sodium succinate; calcium hydroxide is added to react with the epoxy sodium succinate in the tube-type reactor at the temperature of 80-100 DEG C for 2-72 hours. The diameter of the tube-type reactor is phi 50-80 cm, and the length thereof is 30-200m. The obtained polyepoxy sodium succinate has stable product quality.

Description

technical field [0001] The invention relates to a method for preparing a water treatment agent, in particular to a method for preparing sodium polyepoxysuccinate with good stability using a tubular reactor. Background technique [0002] Polyepoxysodium sodium succinate (PESA) is a phosphorus-free and nitrogen-free water treatment agent first developed by Betz Laboratory in the United States in the early 1990s. It has dual functions of corrosion inhibition and scale inhibition, and has good biodegradability, It is characterized by a wide range of applications, and is a "green" environment-friendly multi-scale and corrosion inhibitor and non-phosphorus complexing agent in detergents with wide application prospects. [0003] The reaction equation of synthesizing sodium polyepoxysuccinate: [0004] Regarding the preparation method of sodium epoxysuccinate and its polymer, U.S. Patent US4654159 reports that maleic anhydride is dissolved in water, sodium hydroxide is added to g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/22C02F5/10
Inventor 程终发孙宝季王忠英万振涛刘全华王蛟
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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