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A kind of preparation method of high carboxyl content oxidized starch

A technology of oxidizing starch and high carboxyl group, which is applied in the direction of chemical recovery, etc., can solve the problems that cannot be used to change the process, reduce the molecular weight of starch, and narrow the use, and achieve the effect of increasing the oxidation performance of oxidants, high carboxyl content and low carbonyl content

Active Publication Date: 2022-03-01
ANHUI XUELANG BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the oxidation of starch in this patent uses environmentally friendly ozone as an oxidant, since the main purpose of this patent is to reduce the molecular weight of starch, the oxidation process non-selectively cuts off the chemical bonds in the starch molecules, thus producing oxidized starch , cannot be used in the process of changing the groups and chemical bonds in the starch structure to obtain products, because the yield will be very low and the use will be narrowed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Green method to prepare oxidized starch:

[0037] Step 1: Use water as a solvent, turn on the stirring, m (starch): m (water) = 1:2, slowly add starch to water, and keep the temperature at 35°C.

[0038] The second step: add a composite oxidation catalyst with 1.5% starch mass.

[0039] Components in the composite oxidation catalyst include TS-1 molecular sieve and phosphomolybdic acid, wherein the silicon-titanium ratio of the TS-1 molecular sieve is 30; the preparation method of the composite oxidation catalyst is to add TS-1 molecular sieve to 20% phosphomolybdic acid aqueous solution, m (20% phosphomolybdic acid aqueous solution): m (TS-1 molecular sieve) = 4:1, keep the temperature at 50°C, stir for 5 hours, vacuum dry at 150°C for 4h, and then burn in a muffle furnace at 280°C for one hour. Burn at 360°C for two hours and turn over every fifteen minutes to obtain a composite oxidation catalyst;

[0040] Step 3: Add 5% sodium hydroxide solution dropwise to keep t...

Embodiment 2

[0046] Green method to prepare oxidized starch:

[0047] Step 1: Use water as a solvent, turn on the stirring, m (starch): m (water) = 1:1, slowly add starch to water, and keep the temperature at 30°C.

[0048] The second step: add a composite catalyst with 3% starch mass.

[0049] Components in the composite oxidation catalyst include TS-1 molecular sieve and phosphomolybdic acid, wherein the silicon-titanium ratio of the TS-1 molecular sieve is 80; (20% phosphomolybdic acid aqueous solution): m (TS-1 molecular sieve) = 8:1, keep the temperature at 50°C, stir for 5 hours, vacuum dry at 150°C for 4h, and then burn in a muffle furnace at 280°C for one hour. Burn at 380°C for two hours and turn over every fifteen minutes to obtain a composite oxidation catalyst.

[0050] Step 3: Add 5% sodium hydroxide solution dropwise to keep the pH in the range of 8 to 9, pass ozone gas into the starch suspension, and adopt the method of aerating at intervals of 1 hour and stopping for 15 m...

Embodiment 3

[0056] Green method to prepare oxidized starch:

[0057] Step 1: Use water as a solvent, turn on the stirring, m (starch): m (water) = 1: 3, slowly add starch to water, and keep the temperature at 20°C.

[0058] The second step: add a composite catalyst with 5% starch mass.

[0059] Components in the composite oxidation catalyst include TS-1 molecular sieve and phosphomolybdic acid, wherein the silicon-titanium ratio of the TS-1 molecular sieve is 50; the preparation method of the composite oxidation catalyst is to add TS-1 molecular sieve to 20% phosphomolybdic acid aqueous solution, m (20% phosphomolybdic acid aqueous solution): m (TS-1 molecular sieve) = 6:1, keep the temperature at 50°C, stir for 5 hours, vacuum dry at 150°C for 4h, and then burn in a muffle furnace at 280°C for one hour. Burn at 380°C for two hours and turn over every fifteen minutes to obtain a composite oxidation catalyst.

[0060] Step 3: Add 5% sodium hydroxide solution dropwise to keep the pH withi...

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Abstract

The invention provides a method for preparing oxidized starch with high carboxyl content, comprising: adding a composite oxidation catalyst to a water-based starch suspension at 20-35°C, controlling the suspension to be in a weakly alkaline state, and injecting ozone into the suspension, All the primary hydroxyl groups in the starch are oxidized; the composite oxidation catalyst contains TS‑1 molecular sieve and phosphomolybdic acid; after the oxidation suspension is removed from the composite oxidation catalyst, alcohol analysis, filtration and drying are carried out to obtain a carboxyl group content higher than 20 % and carbonyl content of less than 8% of the oxidized starch. The method of the invention not only has the advantage of being green, but also has high oxidation selectivity, and the carboxyl content in the prepared oxidized starch is significantly higher than that of the existing method.

Description

technical field [0001] The invention relates to a preparation method of oxidized starch. Background technique [0002] Starch, a natural high-molecular carbohydrate, has become an abundant regenerative industrial raw material due to its low price and easy availability. Oxidized starch is one of the main varieties of modified starch. Its production principle is to use α-1,4, α-1,6 glycosidic bonds and hydroxyl groups in starch molecules. The former can be oxidized and broken by oxidants to degrade starch molecules, while the latter can It can be oxidized to carboxyl by oxidant, thus changing the properties of starch. A large number of studies have shown that compared with natural starch, oxidized starch has the advantages of good fluidity, high viscosity stability, strong permeability, and good cohesive force; and the production process is simple and the cost is low. Wide range of uses. However, in the current process, the primary hydroxyl group in the starch is oxidized i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18
CPCC08B31/18Y02P20/584
Inventor 李福甲李云政万玉青
Owner ANHUI XUELANG BIOTECHNOLOGY CO LTD
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