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Catalyst for preparation of 2,3,5-trimethylhydroquinone by hydrogenation of 2,3,5-trimethylbenzoquinone and preparation method of catalyst

A technology of trimethylbenzoquinone and trimethylhydroquinone, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, and can solve problems that have not been reported yet.

Inactive Publication Date: 2019-10-18
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the design, synthesis and application of this catalyst to the hydrogenation of 2,3,5-trimethylbenzoquinone to prepare 2,3,5-trimethylhydroquinone have not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] At 50°C, according to the molar ratio of styrene, acrylic acid, methyl methacrylate, ammonium bicarbonate and ammonium persulfate as 80:7:4:3:1, take 36.40g styrene, 2.10g acrylic acid, 1.90 Put g methyl methacrylate, 1.0 g ammonium bicarbonate, and 1.0 g ammonium persulfate in a flask, heat and stir at 50°C for 24 hours. The obtained turbid liquid was centrifuged, washed with distilled water, and the solid was collected, which was the carboxylic acid functionalized PS nanosphere; 0.30 g of the obtained carboxylic acid functionalized PS nanosphere was dispersed in 50 mL of methanol, and 0.002 mol Zn(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 A mixture of O, where Zn(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 8:1. Then 0.02 mol of 2-methylimidazole was dispersed in the methanol solution, reacted at 25° C. for 5 h, and the solid was collected by centrifugation and washed with methanol. The obtained solid was dried in a vacuum oven at 100°C to o...

Embodiment 2

[0020]According to the molar ratio of styrene, acrylic acid, methyl methacrylate, ammonium bicarbonate, and ammonium persulfate at 50°C, 18.20g styrene, 1.10g acrylic acid, and 0.95 g methyl methacrylate, 0.50 g ammonium bicarbonate, and 0.50 g ammonium persulfate were placed in a flask, heated and stirred to 90°C for 6 hours. The obtained turbid liquid was centrifuged, washed with distilled water, and the solid was collected, which was the carboxylic acid functionalized PS nanosphere; 0.30 g of the obtained carboxylic acid functionalized PS nanosphere was dispersed in 50 mL of methanol, and 0.002 mol Zn(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 A mixture of O, where Zn(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 0:1. Then 0.02 mol of 2-methylimidazole was dispersed in the above methanol solution, reacted at 75° C. for 1 h, and the solid was collected by centrifugation and washed with methanol. The obtained solid was dried in a vacuum oven at 100°C ...

Embodiment 3

[0023] According to the molar ratio of styrene, acrylic acid, methyl methacrylate, ammonium bicarbonate and ammonium persulfate at 50°C, 27.30g styrene, 1.60g acrylic acid, 1.40 g methyl methacrylate, 0.75 g ammonium bicarbonate, and 0.75 g ammonium persulfate were placed in a flask, heated and stirred to 70°C for 12 hours. The obtained turbid liquid was centrifuged, washed with distilled water, and the solid was collected, which was the carboxylic acid functionalized PS nanosphere; 0.30 g of the obtained carboxylic acid functionalized PS nanosphere was dispersed in 50 mL of methanol, and 0.002 mol Zn(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 A mixture of O, where Zn(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 1:1. Then 0.02 mol of 2-methylimidazole was dispersed in the above methanol solution, reacted at 50° C. for 3 h, and the solid was collected by centrifugation and washed with methanol. The obtained solid was dried in a vacuum oven at 100°C to ...

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PUM

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Abstract

The invention provides a catalyst for preparation of 2,3,5-trimethylhydroquinone by hydrogenation of 2,3,5-trimethylbenzoquinone and a preparation method of the catalyst. A precursor of the catalyst is composed of carboxylic acid functionalized polystyrene (PS) nanospheres and a zeolite imidazole framework (ZIF) composite structure with a shell layer containing Zn / Ni mixed metals, the precursor ofthe catalyst is subjected to pyrolysis in the N2 atmosphere at 800-1100 DEG C to remove the PS nanospheres to form a hollow structure, at the same time, metal Zn in the ZIF is removed to form a N-doped porous carbon structure, subsequent acid treatment is performed, and finally the N-doped porous carbon supported metal Ni catalyst having a hollow structure is obtained, wherein metal Ni accounts for 2%-10% of a total weight of the catalyst, and heteroatom N accounts for 2%-8% of the total weight of the catalyst. The catalyst provided by the invention has high catalytic performance when used for preparation of the 2,3,5-trimethylhydroquinone by hydrogenation of the 2,3,5-trimethylbenzoquinone.

Description

technical field [0001] The invention relates to a heterogeneous catalyst and a preparation method thereof, in particular to a catalyst for preparing 2,3,5-trimethylhydroquinone by hydrogenation of 2,3,5-trimethylbenzoquinone and a preparation method thereof. Background technique [0002] Vitamin E, as one of the vitamin products with the largest market capacity in the world, has important uses in the fields of food industry, pharmaceutical industry, feed industry, and cosmetics, and is one of the indispensable substances for the human body. Due to its rich biochemical functions, the market demand for vitamin E is increasing year by year. 2,3,5-Trimethylhydroquinone is an important intermediate in the synthesis of vitamin E, which can produce vitamin E through condensation reaction with isophytic alcohol. At present, the synthesis of 2,3,5-trimethylhydroquinone mainly has the following two ways: one is to extract from petrochemical products, but this method has complicated p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C07C37/07C07C39/08
CPCB01J27/24B01J37/0018C07C37/07B01J35/60B01J35/61C07C39/08
Inventor 张富民蔡秋兰徐琼皓朱伟东
Owner ZHEJIANG NORMAL UNIVERSITY
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