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Synthesis method of polyepoxysuccinic acid

A technology of polyepoxysuccinate and synthesis method, which is applied in the field of synthesis of polyepoxysuccinate, can solve problems such as poor scale inhibition performance, and achieve excellent scale inhibition performance, easy operation, and simple operation

Inactive Publication Date: 2014-01-08
宋晶冰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But most of the existing polyepoxysuccinic acid has the disadvantage of poor scale inhibition performance, so it is very important to develop a polyepoxysuccinic acid with good scale inhibition performance Meet the needs of the market

Method used

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  • Synthesis method of polyepoxysuccinic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (2) Then add alkaline solution to the reaction kettle, adjust the pH to 7, then start heating, when the temperature rises to 55°C, add 2g of sodium tungstate;

[0027] (3) When the temperature rises to 70°C, stop heating, add 100g of hydrogen peroxide to the reaction kettle, and dropwise add sodium hydroxide solution at the same time, adjust the reaction pH=7, after adding the hydrogen peroxide, keep the temperature at 70°C, pH =7 under the condition of reaction 2h;

[0028] (4) After the reaction is completed, adjust the pH to 6-8, and then use a vacuum pump to dehydrate, the vacuum degree is -60-98KPa, and remove 380g of water;

[0029] (5) After the dehydration is completed, raise the temperature to 90°C, add 5g of calcium hydroxide twice, then adjust the reaction temperature to 60-95°C, and react for 1.5 hours to prepare polyepoxysuccinate.

[0030] Example 2

Embodiment 2

[0032] (2) Then add alkali solution to the reaction kettle, adjust the pH at 7, and then start heating. When the temperature rises to 55°C, add 5g of sodium tungstate;

[0033] (3) When the temperature rises to 70°C, stop heating, add 200g of hydrogen peroxide to the reaction kettle, and dropwise add sodium hydroxide solution at the same time, adjust the reaction pH=7, after adding the hydrogen peroxide, keep the temperature at 70°C, pH =7 under the condition of reaction 4h;

[0034] (4) After the reaction is completed, adjust the pH to 6-8, and then use a vacuum pump to dehydrate, the vacuum degree is -60-98KPa, and remove 520g of water;

[0035] (5) After the dehydration is completed, raise the temperature to 90°C, add 15g of calcium hydroxide twice, then adjust the reaction temperature to 60-95°C, and react for 2.5 hours to prepare polyepoxysuccinate.

[0036] Example 3

Embodiment 3

[0038] (2) Then add alkaline solution to the reaction kettle, adjust the pH to 7, then start heating, when the temperature rises to 55°C, add 3g of sodium tungstate;

[0039] (3) When the temperature rises to 70°C, stop heating, add 150g of hydrogen peroxide to the reaction kettle, and dropwise add sodium hydroxide solution at the same time, adjust the reaction pH=7, after adding the hydrogen peroxide, keep the temperature at 70°C, pH =7 under the condition of reaction 3h;

[0040] (4) After the reaction is completed, adjust the pH to 6-8, then dehydrate with a vacuum pump, the vacuum degree is -60-98KPa, and remove 450g of water;

[0041] (5) After the dehydration is completed, raise the temperature to 85-95°C, add 5g of calcium hydroxide twice, then adjust the reaction temperature to 60-95°C, and react for 2 hours to prepare polyepoxysuccinate.

[0042] Example 4

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Abstract

The invention belongs to the technical field of chemical synthesis and discloses a synthesis method of polyepoxysuccinic acid. The synthesis method comprises the following steps of: firstly hydrolyzing maleic anhydride serving as a raw material by using water and alkali to generate maleate, and carrying out epoxidation reaction under the action of a peroxide catalyst to generate epoxysuccinic acid; then polymerizing the epoxysuccinic acid into the polyepoxysuccinic acid under the action of an alkali catalyst. According to the synthesis method disclosed by the invention, since dehydrating is carried out at a certain temperature in vacuum after the epoxysuccinic acid is generated, the concentration and the polymerization degree of the epoxysuccinic acid are increased and the scale inhibiting property is enhanced. The synthetic method of the polyepoxysuccinic acid, which is disclosed by the invention, has the advantages of easy and convenient operation and no environment pollution. The polyepoxysuccinic acid prepared through the synthetic method has excellent scale inhibiting property.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a synthesis method of polyepoxysuccinate. [0002] Background technique [0003] Polyepoxysuccinic acid (PESA) is a new generation of green and environmentally friendly water treatment agent developed in the 1990s. It is a non-phosphorus, non-nitrogen, biodegradable scale inhibitor and dispersant. It is superior to other antiscalant dispersant. [0004] USP4654159 discloses the preparation process of epoxy succinic acid, which is based on maleic anhydride as raw material, hydrolyzed in an alkaline environment, then adding hydrogen peroxide, and using sodium tungstate as a catalyst for epoxidation reaction to generate epoxy The succinate is polymerized with an alkaline calcium salt as an initiator to obtain the sodium salt of polyepoxysuccinate. [0005] However, most of the existing polyepoxysuccinic acids have the disadvantage of poor scale inhibition performance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/22
Inventor 宋晶冰蒋晓波
Owner 宋晶冰