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High efficiency and clean production method of oxidized starch

A technology of oxidized starch and a manufacturing method, which is applied in the field of efficient and clean manufacturing of continuous fluidized oxidized starch, can solve the problems of increasing production cost, waste water pollution, reducing product yield and the like, and achieves low production cost, less investment, and reaction time. short effect

Inactive Publication Date: 2009-06-17
HANGZHOU PAPERMATE SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The preparation of the above-mentioned oxidized starch is carried out in aqueous solution, and some deeply oxidized starch fragments in the oxidation process will enter the wastewater during filtration, which not only causes wastewater pollution, but also reduces the product yield and increases the production cost, especially when sodium hypochlorite is used to prepare oxidized starch. , there are also a large amount of toxic chloride ions in the wastewater

Method used

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  • High efficiency and clean production method of oxidized starch

Examples

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Effect test

Embodiment 1

[0016] This example oxidized starch efficient and clean manufacturing method (continuous fluidized manufacturing method), adopts cornstarch and potassium permanganate (its consumption is 1.5% of starch) as the proportioning raw materials, selects NiSO 4 To activate the catalyst, it was used in an amount of 30 ppm by weight of cornstarch.

[0017] Catalyst NiSO 4 Dissolve in water to prepare a 5% aqueous solution, then mix the oxidizing agent and the catalyst according to the above ratio, and then mix and homogenize with corn starch continuously and rapidly for 15 minutes in a coulter-type closed device with a rotation speed of 800 rpm.

[0018] The mixed and homogenized material continuously and evenly enters the pipeline reactor with an auger. The material is reacted at 65°C for 30 minutes, and the moisture content of the reaction system is 20%. The viscosity of the primary product of oxidized starch is continuously obtained at about 200mpa. s (BROOKFIELD viscosity, concentr...

Embodiment 2

[0020] As operating according to Example 1, the reaction temperature is controlled at 60°C, the starch adopts potato starch and sodium peroxide (its consumption is 5% of the starch) as raw materials, and CuCl is selected. 2 When it is a catalyst, when its consumption is 40ppm of potato starch, the viscosity of the first product of potato oxidized starch obtained is about 10mpa.s (BROOKFIELD viscosity, concentration 5%, 90°C).

Embodiment 3

[0022] As operating according to Example 1, the reaction temperature is controlled at 70°C, the starch adopts cornstarch and persulfuric acid (its consumption is 3% of the starch) as the proportioning raw materials, and selects FeSO 4 And when CaO (weight part 2:1) is catalyzer, when its consumption is 70ppm of cornstarch, the viscosity that obtains corn oxidized starch first product is about 50mpa.s (NDJ-1 viscosity 60rpm / l No. rotor, concentration 10%, 70°C), the carboxyl content is about 0.09.

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Abstract

The invention relates to a high efficiency clean production method for oxidized starch. The technical problem to be solved by the invention is to carry out the production of the oxidized starch under the conditions of continuous fluidization without waste discharge, shorten the reaction time and reduce the energy consumption. The preparation method comprises: premixing and activating an oxidant and an activating catalyst in advance; and continuously metering and mixing the premixed and activated oxidant and the activating catalyst and the crude starch at a high speed, continuously inputting the mixed material into a pipeline reactor with a packing auger, and carrying out the pipeline reaction at 20 to 80 DEG C for 20 to 100 minutes so as to continuously obtain the oxidized starch crude product. The water content in the reaction system is 12 to 35 percent.

Description

technical field [0001] The invention relates to a dry method for producing oxidized starch, in particular to a continuous fluidized method for efficiently and cleanly producing oxidized starch. Background technique [0002] Oxidized starch is an important modified starch, which is the product obtained by oxidation of starch with oxidants in acid, alkali and neutral medium. Compared with natural starch, it has good fluidity, low viscosity, high stability and strong permeability. , good adhesion, etc., and the production process is simple and low cost. It has a wide range of uses in textile, papermaking, adhesives and other industries, especially in the surface sizing of the papermaking industry. It occupies the first place in various modified starches. . Oxidized starches with different properties and brands can be made by using different oxidation processes, oxidants and raw starch. For example, the use of periodate oxidation can produce dialdehyde starch that has both dry...

Claims

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Application Information

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IPC IPC(8): C08B31/18
Inventor 姚献平郑丽萍龚关善田清泉
Owner HANGZHOU PAPERMATE SCI & TECH
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