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
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[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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