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A kind of preparation technology of decolorization-free alkyl glycoside

A technology of decolorization-free alkyl sugars and alkyl glycosides, which is applied in the field of preparation technology of decolorization-free alkyl glycosides, can solve the problems of dark product color, time-consuming and labor-intensive decolorization process, etc., achieve high surface activity, avoid side reactions, and reduce production cost effect

Active Publication Date: 2019-12-20
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the glycosylation reaction also needs to be carried out in a high-temperature system, and the side reactions are easier to carry out, so the product has a darker color
[0006] From the above background technology, it can be seen that in the alkyl glycoside process currently on the market, side reactions and by-products are unavoidable, which directly causes the decolorization process to be time-consuming and labor-intensive.

Method used

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  • A kind of preparation technology of decolorization-free alkyl glycoside
  • A kind of preparation technology of decolorization-free alkyl glycoside

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Take high amylose corn starch (amylose molecular content is 50%) 60.7g and join in 139.3g ethylene glycol, stir;

[0033] (2) Add p-toluenesulfonic acid 1.6g and phosphoric acid 0.4g to the mixed solution in (1), stir well;

[0034] (3) Heat the mixed solution in (2) to 105° C., stir, and react for 60 minutes to obtain a clear and transparent solution;

[0035] (4) Keep the temperature at 105°C, add 69.7g of dodecyl alcohol to the clear and transparent solution of (3), and stir evenly;

[0036] (5) Maintain the mixed solution in (4) at 105° C., and react for 180 minutes.

[0037] The alkyl glucoside product that above-mentioned steps obtains sees figure 1 As shown, it is a clear transparent liquid, the surface tension is 22.1±0.2 (mN / m), and the soluble solid content is 72.3%.

Embodiment 2

[0039] (1) Take high amylose corn starch (amylose molecular content is 80%) 60.7g and join in 139.3g ethylene glycol, stir;

[0040] (2) Add p-toluenesulfonic acid 1.6g and phosphoric acid 0.4g to the mixed solution in (1), stir well;

[0041] (3) Heat the mixed solution in (2) to 120° C., stir, and react for 60 minutes to obtain a clear and transparent solution;

[0042] (4) Keep the temperature at 120° C., add 48.7 g of octanol to the clear and transparent solution of (3), and stir evenly;

[0043] (5) Maintain the mixed solution in (4) at 120° C., and react for 180 minutes.

[0044] The alkyl glucoside product that above-mentioned steps obtains sees figure 2 As shown, it is a milky white liquid with a surface tension of 27.0±0.7mN / m and a soluble solid content of 70.8%.

Embodiment 3

[0046] (1) Take high amylose corn starch (amylose molecular content is 50%) 60.7g and join in 139.3g ethylene glycol, stir;

[0047] (2) Add p-toluenesulfonic acid 1.6g and phosphoric acid 0.4g to the mixed solution in (1), stir well;

[0048] (3) Heat the mixed solution in (2) to 105° C., stir, and react for 60 minutes to obtain a clear and transparent solution;

[0049] (4) Keep the temperature at 105°C, add 48.7g of octanol to the clear and transparent solution of (3), and stir evenly;

[0050] (5) Maintain the mixed solution in (4) at 105° C., and react for 180 minutes.

[0051] The alkyl glucoside product obtained in the above steps is a clear and transparent liquid with a surface tension of 28.1±1.2mN / m and a soluble solid content of 66.5%.

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Abstract

The invention belongs to the technical field of surfactant development, and discloses a preparation method of decoloring-free alkyl glucoside. The method comprises the following steps: homogeneously dispersing high amylose in short-chain alcohol, then adding a catalyst, heating and stirring, carrying out first-step glycosylation, carrying out heat preservation after the end of the reaction, and adding fatty alcohol, carrying out second-step transglycoside reaction, and thus obtaining the colorless or milky white alkyl glucoside product after the end of the reaction. Compared with ordinary starch, the high amylose has denser starch granules, so the disintegration rate is slow, starch molecular chains cannot be accumulated in a high-temperature system, the occurrence of side reactions is reduced, the product is milky white in color and has no need of decolorization, moreover, the utilization rate of the raw materials is higher, the surface tension of the product is low, and the surface activity is higher.

Description

technical field [0001] The invention belongs to the field of surfactant development, in particular to a process for preparing decolorization-free alkyl glycosides. Background technique [0002] Alkyl glucoside is a non-ionic surfactant obtained by dehydrating the hemiacetal hydroxyl group of starch or glucose and the hydroxyl group of fatty alcohol under the catalysis of acid. It has many advantages such as low surface tension, strong decontamination ability, non-toxic, low skin irritation, can be biodegraded, and can be prepared from renewable materials. It is known as a "world-class" "green" surfactant with broad application prospects. It can be synthesized in one step by direct glycoside method, or in two steps by transglycoside method, and the production process is mature. [0003] However, alkyl glycosides need to be prepared under high temperature and acid-catalyzed conditions. Starch or glucose will generate colored impurities such as ether, levulinic acid, furfural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H15/04C07H1/00C08B31/10
CPCC07H1/00C07H15/04C08B31/10
Inventor 刘鹏李颖尚小琴刘汝峰
Owner GUANGZHOU UNIVERSITY
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