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Degradable chelate surfactant and producing method

A surfactant and production method technology, applied in chemical instruments and methods, dissolution, preparation of organic compounds, etc., can solve the problems of difficulty in accurately controlling the amount of ammonia added, reduced yield, inconvenient production and operation, etc. The effect of deposition, easy production control, strong complexing properties

Inactive Publication Date: 2007-10-10
刘启民
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  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many patent documents related to the preparation of iminodisuccinate at home and abroad, such as: British Patent GB 1306331, Japanese Patent JP 6 / 329606 and JP 6 / 329607, U.S. Patent US 6107518, Chinese Invention Patent 01140417.5, etc. There are characteristics, but what they have in common is that liquid ammonia, ammonia gas or ammonia water is used as the reaction raw material. Whether it is to control the weight of the feed or control the pH, it is difficult to accurately control the amount of ammonia added in industrial production, which will easily lead to a decrease in the yield. Reduced, and the production operation is inconvenient

Method used

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specific Embodiment approach

[0026] 1. Synthesis of sodium iminodisuccinate

[0027] Add 1.96 kg of maleic anhydride and 2 kg of water into a 20-liter reactor, stir and slowly add 0.8 kg of sodium hydroxide dissolved in 1.2 kg of water to form a solution under cooling conditions. During this process of adding alkali, pay attention to controlling the addition of alkali Speed, do not make the temperature of the material in the reactor exceed 60°C. Continue to stir for 5 minutes after adding the lye, at this time the material is dry paste, pH = 2-3. Then ammonium carbonate was added in batches, and a total of 1.0 kg of ammonium carbonate was added. When adding ammonium carbonate, also pay attention to controlling the feeding speed to avoid carbon dioxide from taking the material out. After adding the ammonium carbonate, the material was pasty, pH=7. Then slowly add 0.4 kg of sodium hydroxide dissolved in 0.6 kg of water to form a solution. After the addition, the material becomes a solution state, pH=9. ...

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Abstract

The present invention is degradable chelating surfactant and its production process and belongs to the field of fine chemical technology. Ammonium carbonate or ammonium bicarbonate, rather than ammonia or liquid ammonia, as ammonia source, maleic anhydride and alkali metal hydroxide are reacted in water phase to produce imido disuccinate; and imido disuccinate is further reacted with alkyl acyl chloride or alkyl acyl bromide to produce alkyl amido disuccinate. This kind of compound has strong chelating performance and excellent surface activity and easy to degrade under natural condition.

Description

Technical field: [0001] The invention belongs to the technical field of fine chemical manufacturing, and relates to a surfactant and a production method thereof. Background technique: [0002] The detergent industry used to use sodium tripolyphosphate in large quantities, because sodium tripolyphosphate has a strong complexing ability and can emulsify dirt to prevent dirt redeposition. It is an excellent detergent builder, but a large amount of sodium tripolyphosphate The use of it will lead to eutrophication of water bodies and cause serious environmental problems. At present, phosphorus is banned all over the world and replaced by zeolite, silicate, etc., but these substitutes may bring greater environmental hazards. Therefore, the development of new environmentally friendly surfactant additives is imperative Yes, this includes chelating surfactants. Among the chelating surfactants, EDTA derivative surfactants have been studied more, but the degradability of EDTA itself ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/08C07C229/24B01F17/28C09K23/28
Inventor 刘启民李志宏
Owner 刘启民