Preparation method and production control method of HPS (hydroxypropyl starch)

A technology of hydroxypropyl starch and corn starch, which is applied in the field of starch production, can solve the problems that the degree of substitution of hydroxypropyl starch cannot be controlled according to the demand, the raw material propylene oxide is volatilized and wasted, and the production process is difficult to control, so as to achieve easy operation , high utilization rate of raw materials, convenient operation

Inactive Publication Date: 2018-04-06
山东福洋生物科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The industrial production of hydroxypropyl starch is carried out by the etherification reaction of starch and propylene oxide under alkaline conditions. The etherification reaction mainly occurs on the hydroxyl groups of C2 and C6 on the glucose unit in starch. The existing technology produces Hydroxypropyl starch has the problem of low degree of substitution caused by the volatilization and waste of raw material propylene oxide, and the production process is difficult to control, and it is impossible to control the degree of substitution of hydroxypropyl starch according to the demand and then control the problem of the end point of the reaction

Method used

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preparation example Construction

[0028] The invention provides a kind of preparation method of hydroxypropyl starch, comprises the following steps:

[0029] (1) Put cornstarch milk into the reaction tank, add water to adjust the cornstarch milk into a 35wt%-40wt% aqueous solution, and stir evenly;

[0030] (2) Then add 8%-10% sodium chloride of cornstarch dry weight;

[0031] (3) Slowly add sodium hydroxide with a concentration of 3wt%-5wt% until the pH of the solution reaches 11.0-12.0;

[0032] (4) Control the material temperature in the reaction tank to be 18°C-20°C, and slowly add propylene oxide;

[0033] (5) Take an ethanol solution with a concentration of 10-50%, spray it through the spray pipe at the top of the reactor, raise the temperature of the material in the reaction tank to 38°C-40°C, and fully react until the end to obtain hydroxypropyl starch.

[0034] During the reaction process of the materials in the reaction tank, the production control step of hydroxypropyl starch is also included, and...

Embodiment 1

[0036] This embodiment provides a method for the preparation and production control of hydroxypropyl starch, which requires the degree of substitution to be within the range of 0.08-0.09, and the steps include:

[0037] a. Reaction process: drop into 1.5 tons of cornstarch milk in the reaction tank, add water to adjust concentration and become the aqueous solution that concentration is 35wt%, add the sodium chloride (120kg) that accounts for 8% of cornstarch dry weight after stirring; Slowly add concentration again 3wt% sodium hydroxide, adjust the pH value of the solution to 11.0, and cool to 18°C; then slowly add 5% propylene oxide (75kg) accounting for cornstarch dry weight, get 100kg of ethanol solution of 10% concentration, and pass through the reactor The spray pipe at the top is used for spraying, and the flow rate is controlled to be 50kg / h for 2 hours, and then the temperature is raised to 38°C to continue the reaction.

[0038] b. Monitoring process: During the react...

Embodiment 2

[0041] This embodiment provides a method for the preparation and production control of hydroxypropyl starch, which requires the degree of substitution of the target product to be above 0.08, and the steps include:

[0042] a. Reaction process: drop into 1.75 tons of cornstarch milk in the reaction tank, add water to adjust concentration and become the aqueous solution that concentration is 37wt%, add the sodium chloride (157.5kg) that accounts for 9% of cornstarch dry weight after stirring; Slowly add The sodium hydroxide of concentration 4wt% adjusts the pH value of solution to 11.5, is cooled to 19 ℃; Then slowly adds the propylene oxide (175kg) that accounts for 10% of cornstarch dry weight, gets the ethanol solution 130kg of 30% concentration, passes reaction Spray with the spray pipe at the top of the device, control the flow rate to 65kg / h, spray for 2h, then raise the temperature to 39°C, and continue the reaction.

[0043] b. Monitoring process: During the reaction pro...

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Abstract

The invention provides preparation and control methods of HPS (hydroxypropyl starch). The methods comprise the specific process as follows: an ethanol solution is sprayed at the top of a starch reaction tank to adsorb volatile epoxypropane; Brabender viscosity is used for directly reflecting the substitution degree and the reaction process is controlled. By use of the preparation and control methods, HPS is prepared, various resources can be effectively utilized, waste of raw materials can be prevented, the higher substitution degree can be obtained, more importantly, the reaction process canbe controlled according to the required substitution degree, the production process is simpler to operate, has mild reaction conditions and considerable yield and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of starch production, in particular to a preparation method and production control method of hydroxypropyl starch. Background technique [0002] Hydroxypropyl Starch (HPS) is a non-ionic starch derivative. The introduction of a certain amount of hydroxypropyl groups into starch molecules can enhance the hydrophilic and water-retaining properties of starch paste, improve the transparency and freeze-thaw stability of starch paste, It is a safe edible modified starch recognized at home and abroad. Adding an appropriate amount of hydroxypropyl starch to flour can effectively improve the quality of dough, and it is also widely used in konjac bionic products, meat products and frozen food industries. In addition, hydroxypropyl starch can partially replace expensive natural gums (agar, gelatin, pectin, etc.); It can be used as a thickener and suspending agent in cosmetics and as a binder in building materials. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12
CPCC08B31/12
Inventor 赵伟崔巍巍刘民王健李红利
Owner 山东福洋生物科技股份有限公司
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