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Method for preparing allantion by titanium dioxide-based composite solid catalyst

A solid catalyst, titanium dioxide technology, applied in the field of allantoin, can solve the problems of polluted environment, equipment corrosion, low allantoin yield and the like

Inactive Publication Date: 2018-11-23
茆振斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing catalysts are generally inorganic strong acids. As a catalyst, inorganic strong acids will cause corrosion to equipment and pollute the environment; what is more important is that the catalytic effect of inorganic strong acid catalysts is not very superior, resulting in a generally low yield of allantoin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Mix tetrabutyl titanate, graphene, dimethylformamide, and ethanol in a weight ratio of 20:8:50:60 (mixing temperature is 25°C, mixing time is 50 minutes) to form solution A;

[0043] 2) Mix water, ethanol and acetic acid according to the weight ratio of 5:23:2.5 (mixing temperature is 25°C, mixing time is 50min) to form solution B;

[0044] 3) Mix copper salt (copper sulfate), zinc salt (zinc sulfate), silver salt (silver nitrate), water, and ethanol in a weight ratio of 10:3:0.5:23:18 (mixing temperature is 25°C, mixing time 50min) to form solution C;

[0045]4) Add solution B and solution C dropwise to solution A at the same time (the volume ratio of solution A, solution B and solution C is 100:23:10), and then stand still (the stand temperature is 15°C, and the stand time is 20h), drying (drying temperature is 105°C, drying time is 8h), grinding to obtain powder objects;

[0046] 5) The powder object was calcined (from 25°C at 2.3°C / min to 330°C and held for 35 ...

Embodiment 2

[0048] 1) Mix tetrabutyl titanate, graphene, dimethylformamide, and ethanol at a weight ratio of 20:5:40:50 (mixing temperature is 15°C, mixing time is 60 minutes) to form solution A;

[0049] 2) Mix water, ethanol and acetic acid in a weight ratio of 5:20:2 (mixing temperature is 15°C, mixing time is 60 minutes) to form solution B;

[0050] 3) Mix copper salt (copper chloride), zinc salt (zinc chloride), silver salt (silver nitrate), water, and ethanol in a weight ratio of 10:2:0.2:20:15 (mixing temperature is 15°C, The mixing time is 60min) to form solution C;

[0051] 4) Add solution B and solution C dropwise to solution A at the same time (the volume ratio of solution A, solution B and solution C is 100:20:8), and then stand still (the stand temperature is 10°C, and the stand time is 24h), drying (drying temperature is 100°C, drying time is 10h), grinding to obtain powder objects;

[0052] 5) The powder object was calcined (from 15°C at 2°C / min to 300°C and held for 30 m...

Embodiment 3

[0054] 1) Mix tetrabutyl titanate, graphene, dimethylformamide, and ethanol in a weight ratio of 20:10:60:70 (mixing temperature is 35°C, mixing time is 40 minutes) to form solution A;

[0055] 2) Mix water, ethanol and acetic acid according to the weight ratio of 5:25:3 (mixing temperature is 35°C, mixing time is 40min) to form solution B;

[0056] 3) Mix copper salt (copper nitrate), zinc salt (zinc nitrate), silver salt (silver nitrate), water, and ethanol in a weight ratio of 10:4:0.6:26:20 (mixing temperature is 35°C, mixing time 60min) to form solution C;

[0057] 4) Add solution B and solution C dropwise to solution A at the same time (the volume ratio of solution A, solution B and solution C is 100:25:12), and then stand still (the stand temperature is 20°C, and the stand time is 12h), drying (drying temperature is 110°C, drying time is 6h), grinding to obtain powder objects;

[0058] 5) Calcining the powder (from 35°C at 2.5°C / min to 360°C and holding for 40 minutes...

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Abstract

The invention discloses a method for preparing allantion by a titanium dioxide-based composite solid catalyst. The method comprises: 1) mixing tetrabutyl titanate, graphene, dimethyl formamide and ethanol to form a solution A; 2) mixing water, ethanol and acetic acid to form a solution B; 3) mixing copper salt, zinc salt, silver salt, water and ethanol to form a solution C; 4) simultaneously dropwise adding the solution B and the solution C to the solution A, then standing, drying and grinding to obtain a powder object; 5) calcining the powder object to obtain a solid catalyst; 6) soaking thesolid catalyst, zinc chloride and niobium pentachloride in hydrochloric acid, then drying to obtain a titanium dioxide-based composite / Lewis acid composition; and 7) performing oxidation reaction on glyoxal with nitric acid to produce glyoxylic acid, and performing condensation reaction on glyoxylic acid, urea and the composition to produce allantion. The method has an excellent yield.

Description

technical field [0001] The invention relates to allantoin, in particular to a method for preparing allantoin through a titanium dioxide-based composite solid catalyst. Background technique [0002] Allantoin, English name Allantion, chemical name 1-ureidodiazolane-2,4-dione, is an important fine chemical product with a wide range of uses. Allantoin has physiological functions such as promoting the growth of skin epithelial cells, healing sores, relieving pain, and softening keratin. It is also non-toxic, non-irritating, non-allergic, has light-proof, bactericidal, anti-corrosion, and anti-oxidation effects, and can keep the skin hydrated. , Moisturizing and soft, so it is widely used in the production of medicine and cosmetics. In addition, allantoin also has the function of stimulating biological growth, and can be used as a plant growth regulator in agricultural production, with effects such as fruit strengthening, ripening, and yield increase. [0003] Natural allanto...

Claims

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Application Information

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IPC IPC(8): C07D233/88B01J27/138B01J37/08B01J37/02
CPCB01J27/138B01J37/0036B01J37/0201B01J37/088C07D233/88
Inventor 茆振斌
Owner 茆振斌
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