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Method for preparing high-substitution hydrobutyl starch through acid-base synergy pretreatment

A technology of hydroxybutyl and high substitution, which is applied in the field of acid-base synergistic pretreatment to prepare high-substituted hydroxybutyl starch, which achieves the effects of high reaction efficiency, improved reaction efficiency and simple equipment

Inactive Publication Date: 2017-10-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with starch before denaturation, starch after etherification and denaturation has been improved and enhanced in terms of freeze-thaw stability, paste liquid transparency and other properties, but it still cannot meet the requirements of various industries. It is urgent to develop a higher degree of substitution and more stable properties. new product of etherified starch

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 1) Disperse the waxy cornstarch in ethanol, configure the starch milk with a mass fraction of 30%, and place it in a three-necked flask. Stir well at room temperature, add concentrated hydrochloric acid with starch dry basis weight of 1.4mL / g, and stir for 0.3h. The water bath was warmed up to 50°C and stirred for 3h. Stop heating, neutralize with sodium carbonate solution to pH 6.8, wash the obtained product with ethanol / water (50v / v), and dry in an oven at 45°C for 24h to obtain acid pretreated waxy cornstarch.

[0073] 2) Take acid pretreated waxy cornstarch and disperse it in ethanol to prepare starch milk with a mass fraction of 10%, and put it in a three-necked flask. In a water bath at 40°C, add an alkali solution containing 0.06% of sodium hydroxide on a dry basis of starch dropwise at a uniform speed, and react for 50 minutes. The obtained product was neutralized to pH 6.8 with 10% by mass fraction of dilute hydrochloric acid, washed with ethanol / water (50v / v...

Embodiment 2

[0079]1) Disperse cornstarch in methanol, configure starch milk with a mass fraction of 35%, and place it in a three-necked flask. Stir well at room temperature, add concentrated hydrochloric acid with a starch dry basis weight of 1.7mL / g, and stir for 0.3h. The water bath was warmed up to 45°C and stirred for 4h. Stop heating, neutralize with sodium carbonate solution to pH 6.8, wash the obtained product with ethanol / water (70v / v), and dry in an oven at 45°C for 24h to obtain acid pretreated cornstarch.

[0080] 2) Disperse acid-pretreated cornstarch in ethanol to prepare starch milk with a mass fraction of 10%, and place it in a three-necked flask. In a water bath at 40°C, add an alkali solution containing 0.04% of sodium hydroxide on a dry basis of starch dropwise at a uniform speed, and react for 45 minutes. The obtained product was neutralized to pH 6.8 with 8% mass fraction of dilute hydrochloric acid, washed with 95% ethanol, and dried in an oven at 45°C for 24 hours ...

Embodiment 3

[0083] 1) Disperse potato starch in isopropanol, configure starch milk with a mass fraction of 35%, and place it in a three-necked flask. Stir evenly at room temperature, add concentrated hydrochloric acid with a dry weight of starch of 2 mL / g, and stir for 40 min. The water bath was warmed up to 45°C and stirred for 5h. Stop heating, neutralize to pH 6.8 with sodium carbonate solution, wash the obtained product with ethanol / water (60v / v), and dry in an oven at 45°C for 24h to obtain acid pretreated potato starch.

[0084] 2) Take acid pretreated potato starch and disperse it in isopropanol to prepare starch milk with a mass fraction of 12% in a three-necked flask. In a water bath at 40°C, add an alkali solution containing 0.05% by mass of sodium hydroxide on a starch dry basis dropwise at a uniform speed, and react for 50 minutes. The obtained product was neutralized with 8% dilute hydrochloric acid to a pH of 6.8, washed with 95% ethanol, and dried in an oven at 45°C for 2...

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Abstract

The invention discloses a method for preparing high-substitution hydroxybutyl starch through acid-base synergy pretreatment. The method comprises the following steps: adding starch into organic alcohol, and carrying out washing and suction filtration after adding concentrated hydrochloric acid for reacting, thus obtaining acid pretreated starch; preparing the acid pretreated starch into starch milk, putting the starch milk in a constant-temperature water bath kettle, dropwise adding a sodium hydroxide solution at a constant speed, neutralizing, washing and drying, thus obtaining acid-base synergistically treated starch; putting the acid-base synergistically treated starch into ethyl alcohol, adding sodium hydroxide and 1,2-epoxybutane for reacting, neutralizing, washing and drying, thus obtaining a target product. According to the method disclosed by the invention, the starch and the 1,2-epoxybutane are used as raw materials, and hydroxybutyl starch of which the substitution is up to 1 to 1.80 is prepared by utilizing an acid-base combination pretreatment mode.

Description

technical field [0001] The invention relates to hydroxybutyl starch, in particular to a method for preparing hydroxybutyl starch with a high degree of substitution through acid-base synergistic pretreatment; it is used in the field of chemical modification of natural macromolecules. Background technique [0002] Starch is a high-molecular carbohydrate, which is a polysaccharide composed of a single type of sugar unit. It is deposited in the seeds, tubers or roots of plants in the form of granules, and is transformed by photosynthesis. It is combined with protein, fiber, oil, sugar and minerals. Substances, etc. co-exist. Due to its wide range of sources, low price, and return to nature in the form of carbon dioxide and water after degradation, it is considered to be a natural and renewable polymer material that is completely pollution-free. The basic unit of starch is D-glucose, and the covalent polymer formed by glucose dewatering molecules connected together through glyco...

Claims

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Application Information

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IPC IPC(8): C08B31/12C08B30/02
CPCC08B31/12C08B30/02
Inventor 高群玉李赛
Owner SOUTH CHINA UNIV OF TECH