Preparation method of water-soluble depepsen

A technology of water-soluble starch and sodium starch sulfate, which is applied in the field of preparation of water-soluble starch sodium sulfate, can solve the problems of environmental pollution, high toxicity of alkyl halide sulfonic acid, etc., achieve safe and non-toxic process, prevent large-scale degradation, and produce and the effect of low raw material cost

Inactive Publication Date: 2008-10-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent (4,093,79) once reported to prepare sodium starch sulfate with alkyl halide sulfonic acid, but alkyl halide sulfonic acid is very toxic and serious to environmental pollution
Some people in China (Hebei Chemical Industry, 27 (3): 41, 2004) r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add concentrated sulfuric acid into the reactor, slowly add n-propanol dropwise, the molar ratio of n-propanol and concentrated sulfuric acid is 1:1.9, stir and react at -10°C for 8 hours, the stirring speed is 1800 rpm, and mix well to obtain Sulfonating agent: add potato starch into the sulfonating agent, the mass ratio of sulfonating agent and potato starch is 25:1, stir and react at -6°C for 4h, let stand, filter, and rinse the solid precipitate with n-propanol for 9 times to obtain starch sulfate; dissolve starch sulfate in water, adjust the pH value to 9 with sodium hydroxide solution, filter to obtain starch sodium sulfate solution; add ethanol to starch sodium sulfate solution, precipitate, centrifuge, and centrifuge speed 4000 rev / min, 30 ℃ drying, obtain sodium starch sulfate product. The degree of substitution of sodium starch sulfate is 0.23.

Embodiment 2

[0018] Add concentrated sulfuric acid into the reactor, slowly add n-propanol dropwise, the molar ratio of n-propanol and concentrated sulfuric acid is 1:2.6, stir and react at -6°C for 9 hours, the stirring speed is 1500 rpm, mix well, and get Sulfonating agent: add wheat starch to the sulfonating agent, the mass ratio of sulfonating agent to wheat starch is 30:1, stir and react at -8°C for 16 hours, let stand, filter, and rinse the solid precipitate with isopropanol for 8 times to obtain starch sulfate; dissolve starch sulfate in water, adjust the pH value to 10 with sodium hydroxide solution, filter to obtain starch sodium sulfate solution; add ethanol to starch sodium sulfate solution, precipitate, centrifuge, and centrifuge speed It is 6000 rpm, dried at 35°C to obtain sodium starch sulfate product. The degree of substitution of sodium starch sulfate is 0.48.

Embodiment 3

[0020] Add concentrated sulfuric acid into the reactor, slowly add n-butanol dropwise, the molar ratio of n-butanol and concentrated sulfuric acid is 1:2.1, stir and react at -8°C for 10h, the stirring speed is 1200 rpm, and mix well to obtain Sulfonating agent: Add cornstarch to the sulfonating agent, the mass ratio of sulfonating agent to cornstarch is 40:1, stir and react at -6°C for 12h, let stand, filter, and rinse the solid precipitate with isopropanol for 7 times to obtain starch sulfate; dissolve starch sulfate in water, adjust the pH value to 8 with sodium hydroxide solution, filter to obtain starch sodium sulfate solution; add ethanol to starch sodium sulfate solution, precipitate, centrifuge, and centrifuge speed It is 7500 rpm, dried at 40°C to obtain sodium starch sulfate product. The degree of substitution of sodium starch sulfate is 0.31.

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PUM

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Abstract

The invention discloses a method for making water-soluble sodium amylosulfate. The method comprises the following steps that: (1) concentrated sulfuric acid is added in a reactor and then alcohol is slowly dripped and stirred with the molar ratio between the alcohol and the sulfuric acid ranging from 1:1.6 to 1:2.8; moreover, the concentrated sulfuric acid and the alcohol are evenly stirred to be made into a sulfonating agent; (2) starch is added in the sulfonating agent with the mass ratio between the sulfonating agent and the starch ranging from 18:1 to 60:1; then, the mixture undergoes stirring reaction, keeping stand and sedimentation and filtration so as to obtain starch sulphate after a plurality of times of alcohol flushing and deposition; (3) the starch sulphate is added in water with the pH value adjusted to between 8 and 10 by sodium hydroxide solution, and sodium amylosulfate solution is obtained after filtration; (4) ethanol is added in the sodium amylosulfate solution to carry out deposition, centrifugal separation and drying, thereby obtaining sodium amylosulfate. The making process does not adopt toxic solvent and the made sodium amylosulfate has the characteristics of higher degree of substitution, less molecular degradation of starch and greater molecular weight and so on.

Description

technical field [0001] The invention relates to a preparation method of water-soluble sodium starch sulfate. Background technique [0002] Starch is an abundant renewable resource in nature, which is a polysaccharide polymer compound connected by dehydration condensation between glucose units through glycosidic bonds. Starch can be divided into two major categories, namely amylose and amylopectin. The amylopectin and amylose contents of different starch sources are different, and most of them are composed of about 30% amylose and 70% amylopectin. There are many kinds of starch-containing crops. In industry, cereal crops (such as corn, wheat, rice) and potato crops (such as potatoes, cassava, sweet potatoes, yams, etc.) are mainly used as raw materials for production. The resulting starch products are called native starch. Starch is modified by derivatization, that is, modified starch, which can significantly improve its performance. Sodium starch sulfate is a chemically m...

Claims

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Application Information

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IPC IPC(8): C08B31/00
Inventor 姚善泾林东强方磊
Owner ZHEJIANG UNIV
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