Benzene tetramethyl acid dianhydride catalyst and preparation method thereof

A technology of pyromellitic dianhydride and catalysts, which is applied in the fields of chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., and can solve the problems of complex equipment flow and operation process, low yield of crude products of pyromellitic anhydride, and catalyst increase. Low weight rate and other problems, to achieve the effect of reducing energy consumption, concise process steps, and good pressure resistance

Inactive Publication Date: 2017-02-22
RUGAO CITY LEHENG CHEM COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the oxidation process of homoanhydride production is a complex heterogeneous catalytic process, it consists of a series of reactions. The demethylation reaction of mesitylene will generate trimethylbenzene, mesitylene, o-xylene, benzene, etc., which will lead to homogeneous The crude anhydride product has low yield, poor quality, heavy color, less crystal particles, and more solid powder; at the same time, the catalyst used has a low weight gain rate and poor selectivity, and the equipment flow and operation process are complicated, and the operating cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment prepares the catalyst that pyromellitic dianhydride is used, and is made through the following steps:

[0023] (1) Weighing: Accurately weigh 3 parts by weight of ammonium metavanadate, 11.4 parts by weight of oxalic acid, 0.4 parts by weight of diammonium hydrogen phosphate, 0.3 parts by weight of anhydrous sodium phosphate, 0.2 parts by weight of antimony oxide, 1.3 parts by weight The ammonium molybdate of weight part, the potassium hydroxide of 1 weight part, the sodium dihydrogen phosphate of 0.8 weight part, the potassium carbonate of 0.2 weight part, the potassium dihydrogen phosphate of 0.7 weight part, the potassium phosphate of 1.18 weight part and 8.8 weight part titanium dioxide;

[0024] (2) Dosing: Heat 70.3 parts by weight of distilled water to 80°C on a water bath, then add weighed diammonium hydrogen phosphate, anhydrous sodium phosphate, ammonium molybdate, antimony oxide, ammonium metavanadate, hydrogen Potassium oxide, sodium ...

Embodiment 2

[0028] The present embodiment prepares the catalyst that pyromellitic dianhydride is used, and is made through the following steps:

[0029] (1) Weighing: Accurately weigh 5 parts by weight of ammonium metavanadate, 11.2 parts by weight of oxalic acid, 0.2 parts by weight of diammonium hydrogen phosphate, 0.1 parts by weight of anhydrous sodium phosphate, 0.18 parts by weight of antimony oxide, 1.1 parts by weight The ammonium molybdate of weight part, the potassium hydroxide of 0.98 weight part, the sodium dihydrogen phosphate of 0.6 weight part, the potassium carbonate of 0.18 weight part, the potassium dihydrogen phosphate of 0.68 weight part, the potassium phosphate of 1.16 weight part and 8.6 weight part titanium dioxide;

[0030] (2) Dosing: Heat 70.1 parts by weight of distilled water to 75°C on a water bath, then add weighed diammonium hydrogen phosphate, anhydrous sodium phosphate, ammonium molybdate, antimony oxide, ammonium metavanadate, hydrogen Potassium oxide, s...

Embodiment 3

[0034] The present embodiment prepares the catalyst that pyromellitic dianhydride is used, and is made through the following steps:

[0035] (1) Weighing: Accurately weigh 4 parts by weight of ammonium metavanadate, 11.3 parts by weight of oxalic acid, 0.3 parts by weight of diammonium hydrogen phosphate, 0.2 parts by weight of anhydrous sodium phosphate, 0.19 parts by weight of antimony oxide, 1.2 parts by weight The ammonium molybdate of parts by weight, the potassium hydroxide of 0.99 parts by weight, the sodium dihydrogen phosphate of 0.7 parts by weight, the potassium carbonate of 0.19 parts by weight, the potassium dihydrogen phosphate of 0.69 parts by weight, the potassium phosphate of 1.17 parts by weight and 8.7 parts by weight titanium dioxide;

[0036] (2) Dosing: Heat 70.2 parts by weight of distilled water to 78°C on a water bath, then add weighed diammonium hydrogen phosphate, anhydrous sodium phosphate, ammonium molybdate, antimony oxide, ammonium metavanadate, ...

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PUM

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Abstract

The invention relates to a tetramethyl benzene catalytic oxidation prepared benzene tetramethyl acid dianhydride catalyst, including a spray solution and a carrier, the spray solution comprises by weight of 3-5 parts of partial ammonium vanadate, 11.2-11.4 parts of oxalic acid, 0.2-0.4 part of diammonium hydrogen phosphate, 0.1-0.3 part of sodium phosphate, 0.18-0.2 part of antimony oxide, 1.1-1.3 parts of ammonium molybdate, 0.98-1 part of potassium hydroxide, 0.6-0.8 part of sodium dihydrogen phosphate, 0.18-0.2 part of potassium carbonate, 0.68-0.7 part of potassium dihydrogen phosphate, 1.16-1.18 parts of potassium phosphate and 8.6-8.8 parts of titanium dioxide; the carrier is a 78.5-78.7 parts of ceramic ring; and the catalyst is prepared through the four steps of weighing, apportioning, spraying and roasting. The advantages of the provided catalyst are characterized in that when applying, the catalyst has relatively good activity, high select ability, low heat point reaction temperature, long service life, low energy consumption for certain resources.

Description

technical field [0001] The invention belongs to the technical field of catalytic oxidation, in particular to a catalyst for preparing pyromellitic dianhydride, and also to a preparation method of the catalyst. Background technique [0002] Pyromellitic dianhydride, referred to as homoanhydride or PMDA, is mainly used as a monomer of polyimide film heat-resistant resin, powder coating, matting agent, epoxy resin curing agent and plasticizer. Because PMDA has many excellent properties such as high temperature resistance, impact resistance and cryogenic resistance, the products made of it have been widely used in cutting-edge technology sectors, such as aircraft, aerospace, aviation, electronics industry and other fields. [0003] At present, domestic pyromellitic dianhydride production methods mostly use durene as raw material, vanadium-titanium series yellow catalyst as catalysis, gas phase oxidation method to produce crude product, referred to as crude anhydride, after hydro...

Claims

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Application Information

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IPC IPC(8): B01J27/199C07D493/04
CPCB01J27/199C07D493/04
Inventor 冯立杰唐泉清唐正华
Owner RUGAO CITY LEHENG CHEM COMPANY
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