Preparation of amorphous particulate carboxymethyl starch

A technology of carboxymethyl starch and amorphous granules, applied in the field of starch modification, can solve the problems of increased production cost, low reaction efficiency, increased load of ethanol washing and ethanol recovery, etc., and achieve high stability, uniform and rapid dissolution Effect

Inactive Publication Date: 2009-01-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, industrial enterprises generally have the problem of low reaction efficiency in the production of carboxymethyl starch, especially when preparing carboxymethyl starch with a high degree of substitution, a large amount of sodium hydroxide and chloroacetic acid are invested, which not only increases the production cost, but also produces a large amount of acid. Alkali waste liquor, increasing the load of ethanol washing and ethanol recovery

Method used

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  • Preparation of amorphous particulate carboxymethyl starch
  • Preparation of amorphous particulate carboxymethyl starch
  • Preparation of amorphous particulate carboxymethyl starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 10g of cornstarch was added to 990g of 30% ethanol solution at normal temperature, kept stirring and the container was airtight, so that the weight percent concentration of the starch milk after mixing was 1%.

[0018] Stir the starch milk evenly and heat it up to 80°C, keep it warm and keep stirring, take samples intermittently and observe under a polarizing microscope until the polarized crosses of more than 90% of the starch granules disappear, that is, the starch granules have completed the transformation of amorphization and loosening.

[0019] Keep the temperature of the starch emulsion after amorphization at 85°C, add 0.1g of chloroacetic acid with a relative starch weight of 1%, and supplement the amount of alkali so that the molar ratio of chloroacetic acid to sodium hydroxide is 1:2, and react for 1 hour , complete the carboxymethylation modification of starch.

[0020] After the carboxymethylation reaction is completed, cool down to room temperature, add glac...

Embodiment 2

[0022] 100g cassava starch is joined at normal temperature in the ethanol solution that 900g volume concentration is 40%, keep stirring and container airtight, make the weight percent concentration of starch milk after mixing be 10%.

[0023] Stir the starch milk evenly and heat up to 55°C, keep stirring continuously and slowly add sodium hydroxide solution to continuously increase the pH, and take samples intermittently to observe under a polarizing microscope until the polarized crosses of more than 90% of the starch granules disappear, stop adding Alkali, that is, completed the amorphous and loose transformation of starch granules.

[0024] Keep the temperature of the starch emulsion after amorphization at 55°C, add 10 g of chloroacetic acid relative to the starch weight of 10%, and supplement the amount of alkali so that the molar ratio of chloroacetic acid to sodium hydroxide is 1:1, and react for 5 hours. Complete the carboxymethylation modification of starch.

[0025] ...

Embodiment 3

[0027] At normal temperature, 200g of potato starch is added to 800g of 50% ethanol solution by volume concentration, and the stirring and container sealing are kept so that the weight percent concentration of starch milk after mixing is 20%.

[0028] Stir the starch milk evenly and heat it up to 82°C, keep it warm and continue to stir, take samples intermittently and observe under a polarizing microscope until the polarized crosses of more than 90% of the starch granules disappear, that is, the starch granules have completed the transformation of amorphization and loosening.

[0029] Keep the temperature of the starch emulsion after amorphization at 70°C, add 40g of chloroacetic acid relative to the starch weight of 20%, and supplement the amount of alkali so that the molar ratio of chloroacetic acid to sodium hydroxide is 2: 1, and react for 10 hours. Complete the carboxymethylation modification of starch.

[0030] After the carboxymethylation reaction is completed, cool dow...

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Abstract

The invention provides a method capable of making a starch carboxylmethyl with high dissolution velocity in water, high stability and high transparency through high efficiency chemical reaction. The method comprises the following steps that (1) the raw material of starch is prepared into a 1 to 40 mass percent emulsified starch in an 30 to 60 volume percent ethanol solution; (2) the emulsified starch is decrystalized through heating or raising pH with addition of alkali; (3) 1 to 20 percent of chloroactic acid or sodium chloroactic against the weight of the starch is added with alkali to achieve a molar ratio between chloroactic acid or sodium chloroactic to sodium hydroxide of 1-2: 1-2, and the reaction lasts for 1-10 hours to accomplish the modification of the hydroxylmethyl group and; (4) a neutralization is carried out with an acid to regulate the pH to be between 6.5 and 7.0, followed by filtration and subsequent repeated rinsing with a 30 to 95 volume percent ethanol; followed by drying, selecting, and packaging to obtain the final product. The product can be widely applied to the fields of medicine / pharmacy, food, textile, printing, petroleum, daily chemicals, construction material, foundry, and packaging.

Description

technical field [0001] The invention relates to the field of starch modification, in particular to performing amorphous and carboxymethyl etherification modification on starch in an ethanol solvent to prepare amorphous granular carboxymethyl starch. This technology can be directly applied in modified starch production enterprises, and the produced carboxymethyl starch products can be widely used in medicine, food, textile, printing and dyeing, oil drilling, daily chemical industry and building materials, casting, packaging and other fields. Background technique [0002] There are amorphous regions and crystalline regions in starch granules. The amorphous regions have high permeability, and chemical reactions mainly occur in this region. If there are more amorphous regions in starch granules, it will be beneficial to the reaction and improve the reaction rate. active and evenly distributed. The crystallization system of amorphous granular starch is destroyed and transformed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C08B30/00
Inventor 张本山张向阳于淑娟李国基高文宏朱思明
Owner SOUTH CHINA UNIV OF TECH
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