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Synthesis method of food grade modified foaming agent azodicarbonamide

A technology of azodicarbonamide and a synthesis method, applied in the field of azodicarbonamide synthesis, can solve the problem of affecting the quality of "AC" foaming agent, difficult to remove highly toxic chemical impurities, and difficult to purify and remove oxidative impurities and other problems, to achieve the effect of low requirements for reaction equipment, less impurities and good product quality

Inactive Publication Date: 2012-06-27
GUANGDONG FOOD IND INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The "AC" foaming agent produced by the chlorate method is difficult to remove because it contains highly toxic chemical impurities, and under the action of strong oxidizing agents such as chloric acid, a large amount of oxidative impurities are generated, which is difficult to purify and remove, seriously affecting "AC" "The quality of the foaming agent, so the "AC" foaming agent produced by this method can only be used as a foaming agent for plastics and other products, and cannot be used as a food additive

Method used

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  • Synthesis method of food grade modified foaming agent azodicarbonamide
  • Synthesis method of food grade modified foaming agent azodicarbonamide
  • Synthesis method of food grade modified foaming agent azodicarbonamide

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The carrier macromolecular compound in the cerium composite catalyst contains the macromolecular silicate of alkylsulfonic acid group and is prepared by the following method: get 125g of potassium dodecylsulfonate, 200g of sodium silicate, and 2.5g of zinc bromide and mix them evenly. Add 800mL of deionized water and stir for 48 hours, then add 6.5g of manganese dioxide (powder, particle size 300 mesh) and mix well, then let it stand still, remove the water layer to get a jelly, let the jelly deposit into a block, and let it dry naturally , and then calcined in a muffle furnace at a high temperature of 850°C to prepare a macromolecular silicate containing an alkylsulfonic acid group.

[0027] Take 200g of the above-mentioned macromolecular silicate and 5.0g of cerium oxide, add it to 200mL of 18% sulfuric acid, soak at 45°C for 12 hours, filter and wash twice with dilute sulfuric acid with a pH of 2.5 to prepare the cerium composite catalyst.

[0028] In a 1000ml three-...

Embodiment 2

[0030] The carrier macromolecular compound in the cerium composite catalyst contains alkylsulfonic acid group-containing macromolecular silicate and is prepared by the following method: Take 100 g of potassium dodecyl sulfonate, 200 g of sodium silicate, and 2 g of zinc bromide, mix well, add 610mL of deionized water was fully stirred for 30 hours, then 5.5g of manganese dioxide (powder, particle size 300 mesh) was added and mixed thoroughly, then left to stand, the water layer was removed to obtain a jelly-like substance, and the jelly-like substance was allowed to settle into blocks, and then air-dried. Then in a muffle furnace, calcined at a high temperature of 650°C to prepare a macromolecular silicate containing an alkylsulfonic acid group.

[0031] Take 200g of the above-mentioned macromolecular silicate and 10g of cerium oxide, add it to 200mL of 18% sulfuric acid, soak at 45°C for 12 hours, filter and wash twice with dilute sulfuric acid with a pH of 2.5 to prepare the ...

Embodiment 3

[0034]The carrier macromolecular compound in the cerium composite catalyst contains the macromolecular silicate of alkylsulfonic acid group and is prepared by the following method: Take 150g of potassium dodecylsulfonate, 200g of sodium silicate, and 3g of zinc bromide, mix them evenly, add 1765mL of deionized water was fully stirred for 40 hours, then 12.7g of manganese dioxide (powder, particle size: 300 mesh) was added and mixed thoroughly, then left to stand, the water layer was removed to obtain a jelly, and the jelly was allowed to settle into blocks, and then air-dried. Then, in a muffle furnace, calcining at a high temperature of 1000° C. is prepared to obtain a macromolecular silicate containing an alkylsulfonic acid group.

[0035] Take 200g of the above-mentioned macromolecular silicate and 24g of cerium oxide, add it to 200mL of 18% sulfuric acid, soak at 45°C for 12 hours, filter and wash twice with dilute sulfuric acid with a pH of 2.5 to prepare the cerium compos...

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Abstract

The invention discloses a synthesis method of food grade modified foaming agent azodicarbonamide. Biurea is used as as raw material, and under the effect of a cerium composite catalyst and a reaction solvent, the temperature of the solution is adjusted to 60-70 DEG, the pH value is 2-5, catalytic oxidation reaction is carried out for 3-5h under the oxygen condition, and then the food grade modified foaming agent azodicarbonamide can be obtained through filtering and purifying. The synthesis method disclosed by the invention has a novel process, low requirements on reaction equipment, and is environment-friendly and safe. A product obtained by the method contains fewer impurities, has good quality and high yield, and can be used in food-grade additives.

Description

technical field [0001] The invention relates to a synthesis method of azodicarbonamide, in particular to a synthesis method of a modified foaming agent azodicarbonamide. Background technique [0002] Biurea: Its chemical formula is C 2 h 6 N 4 o 2 , the English name is 1,2-Hydrazinedicarboxamide, and the structural formula is , Azodicarbonamide, its English name is Azodicarbonamide, and its structural formula is: , Azodicarbonamide, commonly known as "AC" foaming agent, can be used as normal pressure or pressurized foaming agent for polyvinyl chloride, neoprene rubber, natural rubber and other products, and is a widely used foaming agent. "AC" foaming agent is non-toxic and odorless. It is easy to decompose at high temperature and release nitrogen and other gases. Due to its chemical properties, the bread produced has a large volume, good texture, appearance and formability. Therefore, in most European and American countries such as the United States, Britain, France...

Claims

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Application Information

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IPC IPC(8): C07C281/20
Inventor 李家林王三永徐勇张素娟杜晨光
Owner GUANGDONG FOOD IND INST
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