Epoxy sodium succinate and its process for preparing polymer

A technology of sodium epoxysuccinate and polymer, applied in the direction of flocculation/sedimentation water/sewage treatment, organic chemistry, etc., can solve the problems of low calcium ion content, inconvenient direct application, complicated separation process, etc., and achieve good biodegradability , Reduce the generation of by-products, the effect of a wide range of applications

Inactive Publication Date: 2005-10-19
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the above method, a large amount of calcium hydroxide is added during the polymerization reaction, so that the polymer contains a large amount of calcium ions, which is inconvenient for direct application, and the separation process is complicated
[0007] The application number is 03124258.8, the name is called the Chinese patent of the preparation method of polyepoxysuccinic acid and its salt and this is improved, is 1: 0.01~0.05 to add calcium hydroxide by sodium epoxysuccinate and calcium hydroxide mol ratio Initiator, adding sodium hydroxide to adjust the pH=10~13 of the system at the same time, can obtain sodium polyepoxysuccinate or polyepoxysuccinic acid with low calcium ion content, but this patent has no effect on the preparation of sodium epoxysuccinate mono make an explanation

Method used

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  • Epoxy sodium succinate and its process for preparing polymer

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Effect test

Embodiment 1

[0016] Add maleic anhydride and water into the three-necked bottle at a molar ratio of 1:8~10, stir to make it completely dissolve in water, add an appropriate amount of sodium hydroxide solution dropwise, pay attention to controlling the dropping speed, and drop it within 20~30 minutes finished adding. Heating, when the solution temperature reaches 55°C, add catalyst according to 0.01-0.1 of the amount of maleic anhydride, then continuously add 30% hydrogen peroxide which is 1.0-1.3 times of the amount of maleic anhydride, and drop Sodium hydroxide keeps the pH value of the solution between 5 and 7, and the dropwise addition is completed within 30 to 40 minutes. After the dropwise addition is completed, it is heated to 65 to 75° C. and reacted at this temperature for 1 to 1.5 hours. After the reaction, the solution was cooled to room temperature, and acetone was added, and sodium epoxysuccinate precipitated out in white, and then washed 2 to 3 times to obtain sodium epoxysucc...

Embodiment 2

[0025] Weigh 49 g of maleic anhydride into a three-neck flask, stir to make it completely dissolve in water, at this time the pH of the solution is between 2 and 3, and the solution is colorless. Add 80g of 50% sodium hydroxide solution dropwise to the above solution with a dropper. At this time, the reaction is strongly exothermic, and the color of the solution changes from transparent to white, so that the temperature of the solution does not exceed 55°C. The sodium hydroxide solution is added dropwise within 15 minutes. . Weigh 1.7g of the catalyst (the molar ratio of sodium tungstate to ammonium vanadate is 2:1), and add it into the solution. Measure 65ml of 30% hydrogen peroxide, and slowly add it dropwise to the above solution within 20 minutes. While adding the hydrogen peroxide solution dropwise, use a pipette to add 50% sodium hydroxide dropwise to adjust the pH value to about 7. The color of the solution is from white to off-white. The solution was heated up to 70...

Embodiment 3

[0027] The 0.5mol sodium epoxysuccinate prepared in Example 2 was dissolved in 87.9ml of deionized water, stirred to make it completely dissolved, then added 1.85g of initiator calcium hydroxide in batches, and heated to 90°C with an oil bath. ~100°C, react at this temperature for 3~4 hours to obtain sodium polycyclosuccinate. After analysis, the composition distribution of the polymer is: n=1~2 accounts for 8%, n=3~6 accounts for 25%, and n=3~6 accounts for 25%. >6 accounted for 67%.

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Abstract

The present invention is preparation process of sodium epoxy succinate and its polymer. Sodium epoxy succinate is prepared through dissolving maleic anhydride in water, adding sodium hydroxide solution, heating, adding catalyst, adding hydrogen peroxide solution continuously, dropping sodium hydroxide solution, heating to 65-75 deg.c, reaction for 1-1.5 hr, cooling, adding proper amount of acetone to separate sodium epoxy succinate as white precipitate. Sodium epoxy succinate is dissolved in water, and initiator calcium hydroxide is added to react at 90-100 deg.c to obtain sodium epoxy succinate polymer. Or, initiator calcium hydroxide is added directly into the above said reacted solution for reaction of 4-5 hr to obtain sodium epoxy succinate polymer solution, and through further separation, methanol washing to obtain solid sodium epoxy succinate polymer, dissolving in deionized water and vacuum drying to obtain pure solid sodium epoxy succinate polymer.

Description

technical field [0001] The invention relates to a preparation method of a water treatment agent, in particular to a preparation method of sodium epoxysuccinate and a polymer thereof. Background technique [0002] Polyepoxysuccinic acid and its salts are a phosphorus- and nitrogen-free "green" water treatment agent. It has dual functions of corrosion inhibition and scale inhibition, good biodegradability and wide application range. It can be used as a scale inhibitor, dispersant, corrosion inhibitor in industrial water treatment, as a chelating agent for metal ions in detergents, cleaning agents, and detergents. [0003] Regarding the preparation method of sodium epoxysuccinate and its polymer, U.S. Patent (US 4654159) reports: dissolving maleic anhydride in water, adding sodium hydroxide to generate sodium maleate, using sodium tungstate as a catalyst , continuously add hydrogen peroxide, keep pH=5~7 with sodium hydroxide, generate sodium epoxysuccinate, then add calcium h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C07C59/305C08F122/20
Inventor 冯辉霞方卫东王毅
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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