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Process for the oxidation of starch-based materials

A technology for oxidizing starch and powdery materials, applied in chemical instruments and methods, hydrogen peroxide, chemical/physical processes, etc., can solve problems such as changing the color of coarse powder

Inactive Publication Date: 2018-02-06
AMBIENTE E NUTRIZIONE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In this case there is the disadvantage of the persistence of metallic compounds in the final product which change the color of the meal and which are undesirable in products intended for human or animal food use

Method used

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  • Process for the oxidation of starch-based materials
  • Process for the oxidation of starch-based materials

Examples

Experimental program
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Effect test

no. 1 approach

[0027] When using such a device, according to a first embodiment of the invention, the method of oxidizing a starch-containing powdery material comprises the following steps:

[0028] a) feeding a continuous flow of starch-containing powdery material to a first reactor of the type described above, wherein the rotor rotates at a speed greater than or equal to 50 rpm to disperse the continuous flow of starch-containing powdery material into the Particle flow of the above materials;

[0029] b) feeding a continuous flow of aqueous hydrogen peroxide into said reactor together with said continuous flow of starch-containing powdery material, said continuous flow of aqueous hydrogen peroxide being dispersed into a flow of tiny droplets by said rotor;

[0030] c) centrifuging the granules and the droplets against the inner wall of the first reactor to form a highly turbulent, dynamic, thin tubular fluid layer in which the granules of starch-containing pulverulent material are mixed wi...

Embodiment 1

[0116] A stream of powdered potato starch with a moisture content of 20% was fed continuously (100 kg / h) through the opening 6 to the reactor R in which the vane rotor 8 was rotating at a speed of 700 rpm. Simultaneously, a stream of 36 volumes of aqueous hydrogen peroxide solution corresponding to about 10.9% w / v was fed continuously (10 l / h) through the opening 5 .

[0117] The temperature of the inner wall is maintained at about 20°C.

[0118] At the feed inlet of reactor R, the starch stream is immediately mechanically dispersed into granules, which are immediately centrifuged against the inner wall of the reactor, where a dynamic, tubular, thin fluid layer forms. Simultaneously, the aqueous hydrogen peroxide solution supplied through the opening 5 is finely atomized by the blades of the rotor 8, and the blades of the rotor 8 also immediately centrifuge the obtained extremely fine droplets. The latter are thus introduced into a fluid layer of dynamic, tubular, thin starch...

Embodiment 2

[0130] Be that the cornstarch flow of the powder of 18% water content is continuously supplied (80kg / h) reactor R " through opening 306 ", and wherein blade rotor 308 rotates with the speed of 800rpm. Simultaneously, is equivalent to about 9.1%w / v excess Hydrogen oxide solution flow was continuously fed (10 l / h) through opening 305, and a continuous flow of 30 volumes of 9% w / v ammonia solution was continuously fed (10 l / h) through inlet 310. The temperature of the inner wall was maintained at about 20° C. .

[0131] After an average residence time in the reactor of about 30 seconds, the powder with a water content of 33% was continuously discharged from the opening 307 .

[0132] The wet powder is continuously supplied to the turbo dryer T' at a flow rate of 80kg / h through the injector 351 through the opening 405, and at the same time through the opening 406 at a temperature of 100°C (flow rate 400m 3 / h) Supply air flow.

[0133] In the turbo dryer T', the wall temperature...

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Abstract

A process for the oxidation of powder materials containing starch, which comprises the successive steps of mixing a powder material comprising starch with an aqueous solution of hydrogen peroxide (H2O2) and adding to the mixture thus obtained an aqueous solution of ammonia and reacting it with said mixture; the process may also comprise a further step of drying the aforementioned mixture to obtaina powder material containing oxidized starch; the process may advantageously comprise the steps of: - feeding a continuous flow of powder material containing starch into a first reactor (R) comprising a cylindrical tubular body (1) and a rotor, arranged in the cylindrical tubular body, comprising a shaft (8) provided with elements (9) projecting radially therefrom and rotated at a speed greater than or equal to 50 rpm, - feeding into said reactor also a continuous flow of an aqueous solution of hydrogen peroxide - reacting the powder material containing starch and the hydrogen peroxide; - discharging from a discharge opening (7) of the first reactor a continuous flow of a wet powder and feeding this continuous flow into a second reactor (R') comprising a cylindrical tubular body (101) anda rotor, arranged in the cylindrical tubular body, comprising a shaft (108) provided with elements (109) projecting radially therefrom and rotated at a speed greater than or equal to 50 rpm; - feeding into the second reactor (R') also a continuous flow of an aqueous solution of ammonia, - discharging from a discharge opening (107) of the second reactor a continuous flow of a wet powder comprisingoxidized starch; - drying the wet powder to a moisture content less than or equal to 20% by weight, thereby obtaining a powder material containing oxidized starch.

Description

technical field [0001] The present invention relates to a method of oxidizing starch-based materials, in particular meal obtained from cereals and starch. Background technique [0002] Oxidized starches are used in all industrial fields where additives with good film-forming and adhesive properties are required. [0003] In the food industry, oxidized starch is a thickener that allows (E-1404) to be used, for example, in creams, sauces and sweet products, while in the paper industry it is used as an additive to increase the strength of paper, with It is used to improve its printing performance and improve the retention of cationic additives, and as a binder for papermaking fibers. WO 00 / 15670 describes the use of oxidized starch as binder for coatings. [0004] Through oxidation, the viscosity of starch in solution or dispersion decreases, and the average molecular weight of starch decreases. [0005] Oxidation of starch is usually carried out using alkaline hypochlorite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18
CPCC08B31/18B01J19/1812C01B15/01B01J2204/005B01J2208/00752B01J2208/065B01J2219/00033B01J2219/00085
Inventor 马西莫·韦扎尼
Owner AMBIENTE E NUTRIZIONE
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