Composite catalytic solid-phase prepared hydroxypropyl starch and preparing method therefor

A technology for the preparation of hydroxypropyl starch and solid phase, which is applied in the field of preparation of hydroxypropyl starch and its preparation, achieving obvious economic benefits, no pollution to the environment, and reduced production costs

Inactive Publication Date: 2007-08-29
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equipment and process conditions involved in industrial production have not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 40-liter sealed reactor with stirring device, thermometer, pressure gauge and pressure reducing valve, add 10kg of cornstarch and 1.5kg of 20% aqueous sodium hydroxide solution, stir at room temperature for 20min, then add 0.6kg of fatty alcohol polyoxyethylene Ether, continue stirring at room temperature and mix evenly (about 10min), then add 2.5kg 1,2-propylene oxide, seal the reactor, and stir to react. During the reaction, adjust the stirring speed to keep the reaction temperature at 80°C-85°C, and the pressure in the reactor at 0.3-0.7MPa. Stir the reaction for 50 minutes. At this time, increase the stirring speed, and the pressure in the reactor does not increase, which proves that the reaction is complete. After the reaction, the pressure in the reactor was released to obtain 12.3 kg of basically dry white powdery hydroxypropyl starch, the water content of the product was 12%, and the molar degree of substitution MS=0.21.

Embodiment 2

[0033] In a 40-liter sealed reactor with a stirring device, a thermometer, a pressure gauge and a pressure reducing valve, add 10kg of cornstarch and 2.5kg of 20% aqueous sodium hydroxide solution, stir and react at room temperature for 20min, then add 0.8kg of fatty alcohol polyoxyethylene Ether, continue to stir and mix at room temperature (about 10min), then add 7.0kg 1,2-propylene oxide, seal the reactor, and stir for reaction. During the reaction, adjust the stirring speed to keep the reaction temperature at 80°C-85°C, the pressure in the reactor at 0.3-0.7MPa, and stir for 50 minutes. At this time, increase the stirring speed, and the pressure in the reactor does not increase, which proves that the reaction is complete. After the reaction, the pressure in the reactor was released to obtain 14.5 kg of basically dry white powdery hydroxypropyl starch, the water content of the product was 14%, and the molar degree of substitution MS=0.46.

Embodiment 3

[0035] The product of Example 2 is used in the food industry, soaked in 75% alcoholic aqueous solution, neutralized with glacial acetic acid, washed to pH 7-8, filtered and dried to obtain pure white powdered hydroxypropyl starch, according to the food industry Determination of the use requirements to make it meet the use standards of the food industry, used for food thickeners.

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PUM

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Abstract

The invention relates to hydroxypropyl starch and the manufacture method. It is made from starch 1 portion, propylene oxide 0.2-0.8 portion, fatty alcohol polyethenoxy ether 0.06-0.15 portion, NaOH 0.03-0.06 portion, and water 0.12-0.3 portion. The method could obviously improve the reacting speed, and the product could meet the demand of paper industry without neutralization.

Description

Technical field: [0001] The invention mainly relates to the preparation of hydroxypropyl starch and a preparation method thereof, in particular to solid phase preparation of hydroxypropyl starch and a preparation method thereof. Background technique: [0002] Hydroxypropyl starch is a kind of non-ionic modified starch prepared by reacting starch with propylene oxide. Since the etherification reaction changes the properties of the original starch, hydroxypropyl starch is widely used in many industrial fields. It is used as a food thickener in the food industry, as an internal sizing agent and surface sizing agent for papermaking in the paper industry, as a warp sizing agent and as an adhesive for non-woven fabrics in the textile industry, and is often used as a sheet in the pharmaceutical industry. Binder and disintegrant, can replace hydroxyethyl cellulose or hydroxypropyl cellulose in oilfield chemicals, is a newly developed drilling fluid additive, especially suitable for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08K5/1525
Inventor 陈广德毛学峰史雪岩
Owner NORTHWEST NORMAL UNIVERSITY
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