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Multi-component catalyst for pyromellitic dianhydride prepared by microwave hydrothermal method

A pyromellitic dianhydride, multi-component technology, applied in the field of chemistry, can solve the problems of poor selectivity, low yield, large catalyst particles, etc., and achieve the effects of fast heating speed, high purity and uniform particle size distribution

Inactive Publication Date: 2018-01-23
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the catalysts used in industry are based on V 2 o 5 -TiO 2 Mainly, other oxides as the auxiliary composite catalyst, but because the prepared catalyst particles are large and the selectivity is poor, the yield will be low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add ammonium metavanadate to the oxalic acid solution, and reduce it to vanadium at 80-90°C; take the amount of V as the standard 1, and add Cr (Cr 2 o 3 )(0.012), Sb(Sb 2 o 3 )(0.025), Sn(SnO 2 ) (0.005) into a suspension, and carry out microwave hydrothermal reaction to obtain a suspension spray liquid, and then spray the spray liquid on a ￠5-6mm SiC carrier preheated to 90-110°C, and cool it for use.

[0028] Put the catalyst into a ￠40mm reaction tube, and control the reaction temperature to 430-450°C. Pass through durene, use air for catalytic oxidation, and the space velocity is 4000-4500h -1 , the product yield is measured once every 2 hours, and the highest weight yield of the product obtained is 90-93%, and the purity of the average anhydride is about 95%.

Embodiment 2

[0030] Add ammonium metavanadate to the oxalic acid solution, and reduce it to vanadium at 80-90°C; take the amount of V as the standard 1, and add Cr (Cr 2 o 3 )(0.036), Sb(Sb 2 o 3 )(0.075), Sn(SnO 2 ) (0.015) into a suspension, and carry out microwave hydrothermal reaction to obtain a suspension spraying liquid, and then spray the spraying liquid on a ￠5-6mm SiC carrier preheated to 90-110°C, and cool it for use.

[0031] Put the catalyst into a ￠40mm reaction tube, and control the reaction temperature to 430-450°C. Pass through durene, use air for catalytic oxidation, and the space velocity is 4000-4500h -1 , the product yield is measured once every 2 hours, and the highest weight yield of the product obtained is 92-95%, and the purity of the average anhydride is about 95%.

Embodiment 3

[0033] Add ammonium metavanadate to the oxalic acid solution, and reduce it to vanadium at 80-90°C; take the amount of V as the standard 1, and add Cr (Cr 2 o 3 )(0.1), Sb(Sb 2 o 3 )(0.2), Sn(SnO 2 ) (0.04) into a suspension, and then carry out microwave hydrothermal reaction to obtain a suspension spray liquid, and then spray the spray liquid on a ￠5-6mm SiC carrier heated to 90-110°C in advance, and cool it for use.

[0034] Put the catalyst into a ￠40mm reaction tube, and control the reaction temperature to 430-450°C. Pass through durene, use air for catalytic oxidation, and the space velocity is 4000-4500h -1 , the product yield is measured once every 2 hours, and the highest weight yield of the product obtained is 90-92%, and the purity of the average anhydride is about 94%.

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PUM

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Abstract

The invention discloses a multi-component catalyst for pyromellitic dianhydride prepared by a microwave hydrothermal method. The multi-component catalyst comprises a main catalyst and auxiliary catalysts; the main catalyst is V2O5; the auxiliary catalysts comprise Cr2O3, Sb2O3 and SnO2; taking the amount of substance of V as a reference 1, the amount of substance of Cr is 0.005 to 0.5, the amountof substance of Sb is 0.005 to 0.5, and the amount of substance of Sn is 0.001 to 0.1. The catalyst disclosed by the invention is prepared by adopting the microwave hydrothermal method; the prepared catalyst is high in purity, uniform in particle size distribution and high in chemical activity.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a catalyst and a preparation method thereof, in particular to the technical field of a preparation method of a catalyst for preparing pyromellitic dianhydride (abbreviated as homoanhydride) by catalyzing durene and its formulation. Background technique [0002] Pyromellitic dianhydride is an important chemical raw material. Its appearance is white powder or needle crystal. Due to its special molecular structure, it can be used as a raw material for the synthesis of heat-resistant polymers, plasticizers, curing agents, surfactants and many other materials. [0003] At present, domestic preparation methods mostly use durene, vanadium-titanium oxide as the main catalyst and auxiliary catalyst, and use air catalytic oxidation to obtain homoanhydride. During the reaction, a large amount of heat will be released during the oxidation of durene, and TiO 2 Under high temperature cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/228B01J37/10B01J37/34C07D493/04
Inventor 王旭红惠洋柴文姚霞喜余磊王哲飞
Owner CHANGSHU INSTITUTE OF TECHNOLOGY