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Stannic oxide matrix composite solid catalyst suitable for preparing allantoin and preparation method thereof

A solid catalyst and tin dioxide technology, applied in the field of allantoin, can solve the problems of environmental pollution, equipment corrosion, low allantoin yield, etc., and achieve the effect of easy-to-obtain raw materials, simple process, and excellent catalytic efficiency

Inactive Publication Date: 2018-11-06
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

preparation example Construction

[0013] The invention provides a method for preparing a tin dioxide-based composite solid catalyst suitable for preparing allantoin, comprising:

[0014] 1) Mix tin salt, bismuth salt, cobalt salt, starch and hydrochloric acid solution, then add alkali to the system and perform ultrasonic vibration, and finally filter the filter cake to stand and dry to obtain the reaction product;

[0015] 2) Calcining the reaction product to obtain a tin dioxide-based composite solid catalyst suitable for the preparation of allantoin.

[0016] In step 1) of the present invention, the amount of each material can be selected within a wide range, but in order to further improve the catalytic effect of the catalyst, preferably, in step 1), tin salt, bismuth salt, cobalt salt, starch, The weight ratio of the hydrochloric acid solution to the alkali is 10:0.2-0.8:1-1.4:8-12:2-4:20-25; and the pH of the hydrochloric acid solution is 4-6.

[0017] In step 1) of the present invention, the mixing cond...

Embodiment 1

[0027] 1) Mix tin salt (tin tetrachloride), bismuth salt (bismuth bismuth laurate), cobalt salt (cobalt naphthenate), starch and hydrochloric acid solution (mixing temperature is 25°C, mixing time is 30min), then Add alkali (potassium hydroxide) into the system and perform ultrasonic oscillation (oscillation temperature is 20°C, oscillation time is 6h, ultrasonic frequency is 35kHz; the weight ratio of tin salt, bismuth salt, cobalt salt, starch, hydrochloric acid solution, and alkali is 10: 0.6: 1.2: 10: 3: 23; and the pH of the hydrochloric acid solution is 5), and finally filter the filter cake to stand (the standing temperature is -3°C, the standing time is 28h), dry (the drying temperature is 115 ℃, drying time is 4h) to obtain the reaction product;

[0028] 2) Calcining the reaction product (from 25°C at 1.7°C / min to 230°C and holding for 35 minutes, then at 1°C / min to 390°C and holding for 3 hours) to obtain tin dioxide suitable for the preparation of allantoin Based c...

Embodiment 2

[0030] 1) Mix tin salt (tin methanesulfonate), bismuth salt (bismuth isooctanoate), cobalt salt (cobalt stearate), starch and hydrochloric acid solution (mixing temperature is 15°C, mixing time is 40min), and then add Add alkali (sodium hydroxide) into the system and perform ultrasonic oscillation (oscillation temperature is 15°C, oscillation time is 8h, ultrasonic frequency is 30kHz; the weight ratio of tin salt, bismuth salt, cobalt salt, starch, hydrochloric acid solution, and alkali is 10 : 0.2: 1: 8: 2: 20; and the pH of the hydrochloric acid solution is 4), and finally filter the filter cake to stand (the standing temperature is -5°C, the standing time is 24h), dry (the drying temperature is 110°C , drying time is 5h) to obtain the reaction product;

[0031] 2) Calcinate the reaction product (from 15°C at 1.5°C / min to 200°C and hold for 30 minutes, then at 0.8°C / min to 380°C and hold for 2 hours) to obtain tin dioxide suitable for the preparation of allantoin Based comp...

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PUM

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Abstract

The invention discloses a stannic oxide matrix composite solid catalyst suitable for preparing allantoin and a preparation method thereof. The preparation method includes the following steps of: 1) mixing tin salts, bismuth salts, cobalt salts, starch and hydrochloric acid solution, adding alkali into the system and performing ultrasonic oscillation, filtering and taking a filter cake, standing and drying to obtain a reaction product; 2) calcining the reaction product to obtain a tin dioxide matrix composite solid catalyst suitable for preparing allantoin. The composite solid catalyst has excellent catalytic efficiency for the synthesis of allantoin, and the preparation method has the advantages of simple process and readily available raw materials.

Description

technical field [0001] The invention relates to allantoin, in particular to a tin dioxide-based composite solid catalyst suitable for preparing allantoin and a preparation method thereof. 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. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843B01J35/02C07D233/88
CPCC07D233/88B01J23/8437B01J35/00B01J35/30
Inventor 茆振斌
Owner 茆振斌
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