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A kind of preparation method and application of cold water instant high amylose starch

A high-amylose, instant technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of normal growth of trees and crops, coal powder falling, time-consuming tarpaulin covering, etc., to achieve reaction efficiency and uniformity Good performance, improve strength and toughness, reduce storage and transportation loss

Active Publication Date: 2022-02-22
HENAN CHEM IND RES INST +2
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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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  • A kind of preparation method and application of cold water instant high amylose starch
  • A kind of preparation method and application of cold water instant high amylose starch

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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 the agitator, add 40 parts by weight of high-amylose cornstarch to prepare starch slurry;

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

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

[0033] 4) Pre-gelatinization: the mixture is concentrated and centrifuged, washed with 10 parts by weight of 95% ethanol, dried by drum at a pressure of 0.3-0.5 MPa and a rotating 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 the agitator, add 40 parts by weight of high-amylose cornstarch to prepare starch slurry;

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

[0037] 3) Cross-linking reaction: add hydrochloric acid solution to adjust the pH to 10.0-11.0, then add 0.6 parts by weight of 2-aminoethylsulfonamide, react until the viscosity is 300-800mPa·s, and prepare the mixture;

[0038] 4) Pregelatinization: Concentrate and centrifuge the mixture, wash it with 10 parts by weight of 95% ethanol, dry it with a drum at a pressure of about 0.3-0.5 MPa and a speed of about 20-45 rpm, then crush and sieve to prepare starch .

Embodiment 3

[0040] 1) Starch slurry mixing: first put 200 parts by weight of ethanol into the reaction kettle, start the agitator, add 40 parts by weight of high-amylose cornstarch to prepare starch slurry;

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

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

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

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Abstract

The invention provides a preparation method and application of cold-water instant high-amylose starch. The cold-water instant high-amylose starch is reacted in ethanol, and the reaction efficiency and uniformity are good. A sulfoethyl group is introduced into the high-amylose molecule to increase its viscosity. , hydrophilicity, strength and toughness after film formation. By adopting cold-water instant modified high-amylose starch as a film-forming agent, a new, environmentally friendly, non-toxic special coal dust suppressant is developed to solve the problem of mildew, delamination, and viscosity drop in the current coal dust suppressant during storage. During the process, there are problems such as polluted road bed and long dissolution time; the successful development of environmentally friendly coal dust suppressant will overcome the common technical problems in the process of using coal dust suppressant, solve the problem of coal transportation dust pollution, and reduce coal storage. Transport loss, improve and purify the atmospheric environment of railway transport.

Description

technical field [0001] The invention belongs to the technical field of modified high-amylose starch, and in particular 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 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. The instantaneous strong turbulent airflow causes coal powder particles to fly down, resulting in 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 seri...

Claims

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Application Information

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Patent Type & Authority Patents(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