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Pyromellitic dianhydride catalyst and preparation method thereof

A technology of pyromellitic dianhydride and catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., and can solve the problems of low catalyst yield and selectivity

Inactive Publication Date: 2011-04-13
INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low catalyst yield and selectivity in the preparation of pyromellitic dianhydride by the existing gas phase oxidation method; and provide a pyromellitic dianhydride catalyst and a preparation method thereof

Method used

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specific Embodiment approach 1

[0010] Specific embodiment one: In this embodiment, the pyromellitic dianhydride catalyst is composed of an active component and a carrier, and the active component is composed of molecular parts V 2 o 5 , 10-12 molecular parts TiO 2 , 0.02~0.1 molecular parts P 2 o 5 , 0.05~0.15 molecular parts Sb 2 o 3 It is composed of 0.01-0.05 molecular parts of alkali metal oxide, and the total mass of the active component is 10%-20% of the mass of the carrier.

specific Embodiment approach 2

[0011] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the alkali metal oxide is K 2 O or Cs 2 O. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the material of the carrier is spherical non-porous silicon carbide, α-alumina, talc or bisque. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a pyromellitic dianhydride catalyst and a preparation method thereof, relates to a catalyst and the preparation method and solves the problems of low catalyst yield and low selectivity of the conventional gaseous oxidation method for preparing pyromellitic dianhydride. The catalyst consists of an active ingredients and a carrier, wherein the active ingredients consist of V2O5, TiO2, P2O5, Sb2O3 and alkali metal oxides. The method comprises the following steps of: 1, weighing; 2, adding an antimony source and a vanadium source into oxalic acid solution with stirring to obtain vanadyl oxalate solution; 3, adding a phosphorus source, the antimony source and alkali metal salt into the vanadyl oxalate solution, uniformly mixing, then adding a titanium source, adding polyvinyl acetate emulsion and then pulping and grinding to obtain size; and 4, adding the carrier into a revolving drum of spray painting equipment, heating and spraying the size on the carrier, putting into a Muffle furnace to carry out air purge and cooling to obtain the catalyst. The catalyst is used for catalysis and preparation of pyromellitic dianhydride.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof. Background technique [0002] Pyromellitic dianhydride (PMDA) is an important chemical raw material, mainly used as a monomer of polyimide, polyimidazole and other heat-resistant resins, powder coating matting agent intermediates, pharmaceutical intermediates, and environmental protection materials. Oxygen resin curing agent, etc., the products made of it have been widely used in the cutting-edge technology departments of aviation, aerospace, electronic industry and other fields. [0003] At present, the production method of pyromellitic dianhydride mostly adopts durene with vanadium-titanium oxide as a catalyst, and uses air catalytic oxidation to obtain crude product pyromellitic dianhydride (crude anhydride for short), which is further purified by hydrolysis and recrystallization. Get fine pyromellitic dianhydride (referred to as homoanhydride). [0004] The existing gas-phase o...

Claims

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Application Information

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IPC IPC(8): B01J27/198C07D493/04
Inventor 刘传玉王勃王文彬田勇张春荣
Owner INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
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