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Process for preparing light color transparent alkyl glycoside

A technology for preparing alkyl glycosides, which is applied in the field of preparing light-colored transparent alkyl glycosides, can solve problems such as inability to use, and achieve the effects of convenient operation, simple process, and wide product applicability

Inactive Publication Date: 2005-07-06
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above process, due to the presence of magnesium oxide, a bleaching aid, the obtained product has a large amount of apparent suspended matter, and this type of product cannot be used in engine emulsified fuel oil, electronic depression, and other application systems that require clear appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 2M 3 Add C to the reactor 8-12 550kg of natural aliphatic alcohol, pass nitrogen, turn on stirring and external circulation pump, add anhydrous glucose 150kg, p-toluenesulfonic acid catalyst 1kg at one time. React at a pressure of 25 mmHg and 120° C. for 3 hours, cool down to 80° C., add 270 g of a mixture of MgO and NaOH, and adjust the pH value to 8. At this time, the reaction mixture is light yellow. The material is sent to the thin film scraper evaporator at 140-150. C temperature condition, pressure 0.5mmHg, release free natural fatty alcohol. Under stirring conditions, it is prepared into a 50% alkaline aqueous solution of alkyl glycoside, adding H 2 o 2 Bleach to get 450kg light color C k-10 Alkyl glycoside products.

[0022] Diatomite filter layer is prefabricated in the fine filter, the filter mesh of the fine filter has a pore size of 3 microns, the temperature of the material in the fine filter is kept at 75±2°C, and the filtration pressure is maintaine...

Embodiment 2

[0024] 2M 3 Add C to the reactor 12-16 600kg of natural aliphatic alcohol, vent nitrogen, turn on stirring and external circulation pump, add anhydrous glucose 125kg, dodecylbenzenesulfonic acid catalyst 1.8kg at one time. React at a pressure of 15 mmHg and 110° C. for 3.5 hours, cool down to 90° C., add 210 g of a MgO / NaOH mixture, and adjust the pH to 8. At this time, the reaction mixture is khaki. The material is sent to the thin film scraper evaporator, and the free natural fatty alcohol is released under the temperature condition of 160-180°C and the pressure of 0.2mmHg. Prepare a 50% alkaline aqueous solution of alkyl glycosides under stirring conditions, add H 2 o 2 Bleach to get 426kg light yellow C 12-16 Alkyl glycoside products.

[0025] The pore size of the fine filter is 5 microns, the temperature of the material in the fine filter is kept at 88±2°C, the filtration pressure is maintained at 0.5-0.6MPa, and the above-mentioned yellowish C 12-16 The alkyl gluco...

Embodiment 3

[0027] 2M 3 Add C to the reactor 8-12 550kg of natural aliphatic alcohol, blow nitrogen, turn on the stirring and material external circulation pump, add anhydrous glucose 180kg, p-toluenesulfonic acid / phosphoric acid / ethylenediaminetetraacetic acid mixed catalyst 1.2kg at one time. React at a pressure of 10 mmHg and 100° C. for 4 hours, cool down to 80° C., add 270 g of a mixture of MgO and NaOH, and adjust the pH value to 9. At this time, the reaction mixture is light yellow. The material is sent to the thin film scraper evaporator, and the free natural fatty alcohol is released under the temperature condition of 150-160°C and the pressure of 1.5mmHg. Prepare a 50% alkaline aqueous solution of alkyl glycosides under stirring conditions, add H 2 o 2 Bleach to get 522kg light yellow C 8-10 Alkyl glycoside products.

[0028] The above yellowish C 8-10 Alkyl glucoside products enter the fine filter continuously, the filter mesh of the fine filter has a pore size of 8 micro...

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PUM

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Abstract

A process for preparing a light colored transparent alkyl glycoside is provided. Glucose and fatty alcohol are charged into a reaction kettle for outside loop. Neutralizer is charged under the conditions of inert gas shield, acid catalyst existence and vacuum after reaction. The pH value is regulated to 8~9. Free fatty alcohol is removed by distillation under the conditions of temperature in the range of 130~180íµ and pressure less than 2mmHg. Oxydol is charged into alkyl glycoside alkaline aqueous solution after dealcoholization, The light colored transparent alkyl glycoside product is obtained after fine filtration. The process is simple, and the operation is convenient.

Description

technical field [0001] The invention belongs to the preparation process of alkyl glucoside nonionic surfactant, in particular to a process for preparing light-colored transparent alkyl glycoside products. Background technique [0002] At present, the technical routes for the production of alkyl glycosides in the world are transglycosylation method (also known as two-step method or acetal exchange method) and direct glycosidation method (also known as one-step method or direct method). Long and poor product quality is gradually being eliminated; the direct method technology is to make medium and long chain C 8-18 Alkyl glycosides are prepared by direct solid / liquid phase reaction between fatty alcohol and glucose. The reaction principle is the acetalization process of the hemiacetal radical on the glucose ring and the fatty alcohol radical. In the preparation process of alkyl glycosides, in order to obtain alkyl glycoside products with a suitable degree of sugar polymerizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H15/02
Inventor 杨秀全张剑杨庆利王军郝栩李秋小董万田程玉梅
Owner CHINA RES INST OF DAILY CHEM IND
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