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Rare earth-doped tin oxide as well as preparation method and application thereof

A rare earth doping and rare earth oxide technology, which is applied in the chemical industry and can solve the problems of low product yield

Inactive Publication Date: 2019-03-19
HUAIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The classic preparation method is to use acetic anhydride or acetyl chloride to acylate salicylic acid under the catalysis of concentrated sulfuric acid. Although the process is mature, the product yield is low

Method used

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  • Rare earth-doped tin oxide as well as preparation method and application thereof
  • Rare earth-doped tin oxide as well as preparation method and application thereof
  • Rare earth-doped tin oxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0028] The preparation method of the rare earth doped tin oxide of one embodiment, comprises the following steps:

[0029] S110, preparing tin oxide.

[0030] Specifically, the steps of preparing tin oxide include S111~S113:

[0031] S111. Under the condition of 55°C-95°C, tin tetrachloride and alkali are mixed and reacted to obtain tin hydroxide, wherein the molar ratio of tin tetrachloride to alkali is 1:1.5-1:3.5. The base is selected from at least one of NaOH and KOH.

[0032] In one embodiment, the temperature for the mixed reaction of tin tetrachloride and NaOH is 65°C-95°C. Further, the temperature for the mixed reaction of tin tetrachloride and NaOH is 75°C-95°C. Furthermore, the temperature for the mixed reaction of tin tetrachloride and NaOH is 75°C, 95°C, 80°C or 85°C.

[0033] In one embodiment, the ratio of tin tetrachloride to alkali is 1:1.5, 1:2, 1:3, 1:2.5 or 1:3.5.

[0034] S113. Calcining tin hydroxide under the condition of 500° C. to 900° C. to obtain...

Embodiment 1～9

[0060] (1) Prepared as SnCl according to Table 1 4 ·5H 2 O solution and NaOH solution, SnCl in Table 1 4 ·5H 2 The ratio of O and NaOH is the ratio of the amount of substances. Slowly add the NaOH solution to the SnCl 4 ·5H 2 In the O solution, the reaction temperature and the reaction time of each embodiment are shown in Table 1 to obtain the reaction solution. Then the reaction solution was cooled to room temperature, and then centrifuged to obtain a crude product, which was washed with deionized water until the crude product was free of C1- (AgNO3 detection), and then dried without C1 - The crude product was obtained as tin hydroxide. Then tin hydroxide was ground and calcined for 4h to obtain the SnO 2 , the calcination temperature of each embodiment is shown in Table 1.

[0061] Table 1

[0062]

[0063] (2) adopt laser particle size analyzer to measure the SnO of each embodiment respectively 2 particle size and specific surface area. SnO of each example 2 ...

Embodiment 10～15

[0067] (1) Combine the rare earth salt solution with the SnO prepared in Example 7 respectively 2 Mix to get the mixed liquor of each embodiment, wherein, the mass percent of rare earth in the rare earth salt solution corresponding to each embodiment, the rare earth salt solution, the SnO corresponding to each embodiment 2 The dosage is shown in Table 3. Then, the mixtures of each example were mixed with ultrasound at a frequency of 80 Hz for 2 hours, then centrifuged and dried, and then calcined for 4 hours. The calcination temperature is shown in Table 3.

[0068] (2) The particle size of the doped tin oxide obtained in each embodiment is measured respectively by using a laser particle size analyzer method, and the specific surface area of ​​the doped tin oxide obtained in each embodiment is calculated by a laser particle size analyzer method. The particle size and specific surface area of ​​the doped tin oxide obtained in each embodiment are shown in Table 3. The X-ray di...

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Abstract

The invention relates to rare earth-doped tin oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a rare earth salt solution with tin oxide, so as to obtain a mixture; and calcining the mixture at 500-900 DEG C, so as to obtain rare earth-doped tin oxide. The preparation method is simple and easy in implementation, and rare earth-doped tin oxide prepared by virtue of the method is stable, large in specific surface area and high in catalytic activity to acetylsalicylic acid.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a rare earth-doped tin oxide and its preparation method and application. Background technique [0002] Acetylsalicylic acid, also known as aspirin, is an antipyretic and analgesic drug. It is usually used to treat colds, fever, headache, toothache, joint pain, rheumatism, and also to prevent and treat ischemic heart disease, angina pectoris, cardiopulmonary infarction, and cerebral thrombosis. [0003] The classic preparation method is to acylate salicylic acid with acetic anhydride or acetyl chloride under the catalysis of concentrated sulfuric acid. Although the process is mature, the product yield is low. Therefore, in the process of improving the synthesis process of acetylsalicylic acid, it has become a research hotspot both at home and abroad to seek a catalyst with high catalytic activity to synthesize acetylsalicylic acid. Contents of the invention [0004] ...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01J35/10C07C69/157C07C67/08
CPCC07C67/08B01J23/14B01J35/61C07C69/157
Inventor 陈桂郭风仪李秀运肖和导徐春雪
Owner HUAIHUA UNIV
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