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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: 2005-10-19
刘启民
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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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Embodiment Construction

[0026] 1. Synthetic sodium iminodisuccinate

[0027] Add 1.96 kilograms of maleic anhydride and 2 kilograms of water to a 20-liter reaction kettle, and slowly add 0.8 kilograms of sodium hydroxide dissolved in 1.2 kilograms of water under the condition of stirring and cooling with water. Pay attention to control the addition of alkali during this alkali addition process Speed, do not make the temperature of the materials in the reactor exceed 60°C. After adding the lye, continue to stir for 5 minutes. At this time, the material is in a dry paste state with pH=2-3. Then add ammonium carbonate in batches, adding a total of 1.0 kg of ammonium carbonate. When adding ammonium carbonate, also pay attention to control the feeding speed to avoid carbon dioxide from taking out the material. After the addition of ammonium carbonate, the material was pasty with 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 b...

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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 once used a lot of sodium tripolyphosphate because it has strong complexing ability and can emulsify dirt and prevent dirt re-deposition. It is an excellent detergent assistant, but it is a large amount of sodium tripolyphosphate. Use, leading to eutrophication of water bodies, causing serious environmental problems. At present, phosphorus is banned worldwide and replaced by zeolite, silicate, etc., but these alternatives may bring greater environmental hazards. Therefore, the development of new environmentally friendly surfactant additives is imperative Yes, this includes chelating surfactants. Among chelating surfactants, EDTA derivative surfactants are mostly studied, but the degradability of EDTA itself has also been questioned recently. [0003] Imino disuccinate ...

Claims

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Application Information

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IPC IPC(8): C07C227/08C07C229/24C09K23/28
Inventor 刘启民李志宏
Owner 刘启民
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