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Solid acid catalyst and reaction technique for synthesis of allantoin

A solid acid catalyst, catalyst technology, applied in molecular sieve catalysts, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve complex process routes, special reaction raw materials, inorganic strong acid catalyst corrosion, etc. question

Inactive Publication Date: 2009-01-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as special reaction raw materials, complex process routes, and inorganic strong acid catalysts corrode equipment and pollute the environment.

Method used

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  • Solid acid catalyst and reaction technique for synthesis of allantoin
  • Solid acid catalyst and reaction technique for synthesis of allantoin
  • Solid acid catalyst and reaction technique for synthesis of allantoin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare 100ml of ammonia water with a volume percentage of 2.5%, add 100ml of zirconium oxychloride solution with a concentration of 0.15mol / L dropwise under stirring, continue stirring for 2h after the dropwise addition, age for 24h, wash with deionized water until no chloride ions are detected, Add an appropriate amount of dilute sulfuric acid solution to make the pH of the system equal to 2 to obtain a transparent sol containing zirconium hydroxide, and then add WO 3 Powder, stir well and disperse evenly, put it in a 100°C oven for 12 hours and bake at 600°C for 4 hours to obtain ZrO 2 Composite carrier with a content of 53.6 wt%. According to the ratio of load liquid volume / carrier weight of 20ml / g, it is impregnated with 1M ammonium sulfate solution for 2h, filtered and dried at 100°C for 10h, and then roasted at 600°C for 4h to obtain SO 4 2- / ZrO 2 -WO 3 Composite solid superacid catalyst.

[0019]The obtained catalyst is used for the synthesis of allantoin,...

Embodiment 2

[0021] Prepare 100ml of ammonia water with a volume percentage of 2.5%, add 100ml of zirconium oxychloride solution with a concentration of 0.15mol / L dropwise under stirring, continue to stir for 2h after the dropwise addition, then leave it to age for 24h, separate the precipitate, and use deionized Wash well with water. The washed precipitate is redispersed in a small amount of deionized water, and an appropriate amount of dilute sulfuric acid solution is added to make the pH of the system equal to 2, and a transparent sol containing zirconium hydroxide is obtained. Add HZSM-5 molecular sieve to the sol, stir and disperse evenly, then dry at 100°C for 12 hours and roast at 550°C for 4 hours to obtain ZrO 2 Composite carrier with a content of 25% by weight. According to the ratio of loading liquid volume / carrier weight of 15ml / g, the carrier is impregnated and loaded with a sulfuric acid solution with a concentration of 0.5M, and the loading time is 2h. After filtration, th...

Embodiment 3

[0027] Prepare 100ml of ammonia water with a volume percentage of 2.5%, add 100ml of zirconium oxychloride solution with a concentration of 0.15mol / L dropwise under stirring, continue stirring for 0.5h after the dropwise addition, age for 24h, and wash with deionized water until no chloride ions can be detected , the obtained gel was dried at 100°C for 12 hours, after grinding, it was impregnated with 0.5M sulfuric acid solution for 4 hours according to the ratio of load liquid volume / carrier weight of 15ml / g, filtered, dried at 110°C for 12 hours, and then calcined at 600°C for 3 hours to obtain SO 4 2- / ZrO 2 solid acid catalyst.

[0028] The obtained catalyst is applied to the preparation of allantoin, and the reaction conditions are the same as in Example 2. After the reaction, the resulting mixture was cooled to room temperature and filtered with suction. The resulting filter cake was redispersed in hot water and suction filtered while it was hot. The filter cake is ...

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Abstract

The invention relates to a catalyst for synthesis of allantoin by the reaction of glyoxylic acid and urea and a corresponding reaction process. The catalyst is the solid acid catalyst and takes one or the combination of more of oxides and molecular sieves of IVB to VIB elements as a carrier, or a complex which is composed of one or the combination of more of the oxides and the molecular sieves of IVB to VIB elements and one or the combination of more of the oxides of IB, IIB, VIIB, VIIIB and rare earth element as the carrier, and the carrier is carried out the impregnation supporting, the drying and the calcination by using inorganic strong acid or ammonium salt solution thereof for the preparation. The use of the catalyst can synthesize an allantoin product by one-step reaction of the glyoxylic acid and the urea in an atmospheric pressure tank reactor. The catalyst of the invention has the advantages of high activity and stability, recyclable property, no corrosion of the device and environmental pollution, etc. The synthesis reaction process of the allantoin has the advantages of simple process, less using amount of the catalyst, short reaction time and high yield of the allantoin, etc.

Description

technical field [0001] The invention relates to a catalyst and a reaction process for synthesizing allantoin from glyoxylic acid and urea. 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 allantoin exists in the excrement of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J23/30B01J29/40C07D233/76
Inventor 晁自胜付薪菱刘奇梁海军
Owner HUNAN UNIV
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