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Preparation method and application of high-amylose starch capable of rapidly dissolving in cold water

A high-amylose, instant technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of the normal growth of trees and crops, the temperature rise of the working environment of electrical equipment, and the time-consuming method of covering tarpaulins, etc., to achieve reaction efficiency Good uniformity, low preparation cost, and reduced storage and transportation losses

Active Publication Date: 2021-01-12
HENAN CHEM IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country's coal railway transportation mainly adopts open car transportation. Due to the relative speed difference between the high-speed train and the air, it will form a relatively large wind speed. When the trains meet and pass through the tunnel, huge wind and negative pressure will be generated. Instantaneous strong disturbance airflow, which makes coal powder particles fly down, causing losses, dust pollution, and a series of safety and environmental pollution problems
During the transportation process, the powdery materials will be scattered along the railway due to bumps, forming a coal pollution zone, and then rolled by subsequent vehicles to form secondary dust with smaller particle size and higher concentration, which seriously pollutes the coal along the railway. The ecological environment seriously affects the normal growth of trees and crops within 50-100m on both sides of the railway
When the train passes through the tunnel, because the dust diffuses in the tunnel, the coal dust concentration in the tunnel is suffocating, which greatly reduces the visibility in the tunnel, which not only seriously affects the train crew's sight, but once the dust concentration in the tunnel reaches 114mg / m 3 When above (lower limit of coal dust explosion concentration), an explosion accident may be caused when encountering an open flame; because coal dust blocks the locomotive cooling net, the working environment temperature of the electrical equipment in the locomotive rises, often causing equipment failure, which is harmful to train transportation and related serious impact on personnel
[0003] In view of the safety and environmental pollution problems caused by coal transportation, people generally adopt three methods to suppress the formation of coal dust, such as covering tarpaulins, spraying water, and spraying coal dust suppressants. However, the method of covering tarpaulins is time-consuming. The problem of being blown away or cracked; the water spray method has the problem of water evaporation and drying, and repeated water spraying has the problem of unqualified conditions; at present, the main method to suppress coal transportation loss and dust pollution is to spray coal dust suppressant to form a dust on the coal surface. The thickness of the crust layer is 10-20mm, which can well restrain the coal dust from flying out and play a good dust suppression effect. However, mildew, odor, delamination, and viscosity will appear during the storage of the current coal transportation dust suppressant. decline, pollution of the ballast bed during use, long dissolution time, and poor strength and toughness of the solidified layer; the successful development of an environmentally friendly coal dust suppressant will overcome the common technical problems existing in the use of coal dust suppressants and solve The problem of coal transportation dust pollution, reduce the loss of coal storage and transportation, improve and purify the atmospheric environment of railway transportation

Method used

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  • Preparation method and application of high-amylose starch capable of rapidly dissolving in cold water
  • Preparation method and application of high-amylose starch capable of rapidly dissolving in cold water

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Starch slurry preparation: first put 200 parts by weight of ethanol into the reactor, start a stirrer, add 40 parts by weight of high-amylose corn starch, and prepare starch slurry;

[0031] 2) Sulfoethylation reaction: add sodium hydroxide solid to the starch slurry to adjust to pH=13.0, and react at 35°C for 100min; continue to heat up to 55°C, add 42.5 parts by weight of sodium 2-chloroethylsulfonate, and react 100min;

[0032] 3) Cross-linking reaction: add hydrochloric acid solution to adjust pH between about 10.0-11.0, then add 0.6 parts by weight of 2-aminoethylsulfonamide, react to viscosity 300-800mPa·s, and prepare a mixture;

[0033] 4) Pregelatinization: the mixture is concentrated, centrifuged, washed with 10 parts by weight of 95% ethanol, drum-dried under the conditions of a pressure of 0.3-0.5 MPa and a rotation speed of 20-45 rpm, and then crushed and sieved to prepare starch.

Embodiment 2

[0035] 1) Starch slurry preparation: first put 200 parts by weight of ethanol into the reactor, start a stirrer, add 40 parts by weight of high-amylose corn starch, and prepare starch slurry;

[0036] 2) Sulfoethylation reaction: add sodium hydroxide solid to the starch slurry to adjust pH=13.0, and react at 35°C for 100 min; continue to heat up to 55°C, add 30 parts of sodium 2-chloroethyl sulfonate, and react 100min;

[0037] 3) Cross-linking reaction: adding hydrochloric acid solution to adjust pH to be between 10.0-11.0, then adding 0.6 parts by weight of 2-aminoethylsulfonamide, reacting to a viscosity of 300-800 mPa·s to prepare a mixture;

[0038] 4) Pre-gelatinization: the mixture is concentrated, centrifuged, washed with 10 parts by weight of 95% ethanol, drum-dried under the conditions of about 0.3-0.5 MPa pressure and about 20-45 rpm of rotation speed, and then pulverized and sieved to prepare starch .

Embodiment 3

[0040] 1) Sizing of starch slurry: first put 200 parts by weight of ethanol into the reaction kettle, start a stirrer, and add 40 parts by weight of high-amylose corn starch to prepare starch slurry;

[0041] 2) Sulfoethylation reaction: add sodium hydroxide solid to the starch slurry to adjust to pH=13.0, and react at 35°C for 100min; be warming up to 55°C, add 20 parts by weight of sodium 2-chloroethylsulfonate, and react for 100min ;

[0042] 3) Cross-linking reaction: add hydrochloric acid solution to adjust pH between about 10.0-11.0, then add 0.6 parts by weight of 2-aminoethylsulfonamide, react to viscosity 300-800mPa·s, and prepare a mixture;

[0043] 4) Pregelatinization: the mixture is concentrated, centrifuged, washed with 10 parts by weight of 95% ethanol, drum-dried under the conditions of a pressure of 0.3-0.5 MPa and a rotation speed of 20-45 rpm, and then crushed and sieved to prepare starch.

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Abstract

The invention discloses apreparation method and application of high-amylose starch capable of rapidly dissolving in cold water. According to the invention, the high-amylose starch capable of rapidly dissolving in cold water is adopted for a reaction in ethanol, so reaction efficiency and reaction uniformity are good; and a sulfoethyl group is introduced to a high-amylose starch molecule, so the viscosity, hydrophilicity, strength after film formation and toughness of the high-amylose starch are improved. A novel, environment-friendly and non-toxic special coal dust suppressant is developed byadopting the high-amylose starch capable of rapidly dissolving in cold water as a film-forming agent, so the problems of mildewing, layering, viscosity reduction, ballast bed pollution in a use process, long dissolution time and the like in the storage process of existing coal dust suppressants are solved; through successful development of the environment-friendly coal dust suppressant, common technical problems existing in the using process of the conventional coal dust suppressants are solved, the problem of dust pollution in coal transportation is solved, the storage and transportation lossof coal is reduced, and the atmospheric environment of railway transportation is improved and purified.

Description

technical field [0001] The invention belongs to the technical field of modified high amylose starch, and particularly relates to a preparation method and application of cold water instant high amylose starch. Background technique [0002] my country's coal railway transportation mainly adopts gondola transportation. Due to the relative speed difference between the train and the air, the high-speed train will form a large wind speed. Instantaneous strong disturbance of airflow, which causes coal powder to fly, resulting in loss, dust pollution, and a series of safety and environmental pollution problems. During the transportation process, the powdery materials will be scattered along the railway line due to bumps, forming a coal pollution belt. After being rolled by subsequent vehicles, secondary dust with smaller particle size and higher concentration will be formed, which will seriously pollute the environment along the railway line. The ecological environment seriously aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B33/00C08B33/04C09K3/22
CPCC08B33/00C08B33/04C09K3/22
Inventor 霍二福鲁鹏高明谦程伟琴杨帅冯明王柏楠师传兴王延花吴磊张永王毅楠吴宗帅张淑芬付华杰李迎春邢文听韩娟陈蔚李雪萍郭歌杜玉杰王燕王泽涛王运熙陈天天高青环李磊张志岩吴泽鑫付政辉黄蓓罗迎娣王宏力
Owner HENAN CHEM IND RES INST