Benzoic anhydride catalyst and preparation method thereof

A technology of catalysts and co-catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems such as poor strength, high dust, product yield and product quality Decrease and other issues to achieve the effect of reducing production costs, improving the working environment, and reducing losses

Active Publication Date: 2009-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the catalyst active material forms an active material coating on the surface of the carrier, due to the influence of water vapor evaporation, the catalyst active material coating is loose, the strength is poor, the surface of the catalyst is rough, and the fine active material powder is easy to fall off
[0013] In the above-mentioned catalyst preparation method, due to the above problems, the loss of active substances in the preparation is large, which affects the production cost of the catalyst; due to the preparation of the catalyst at high temperature, the open equipment, poor working environment, and a lot of dust affect the environment and have

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Prepare a solution with 75.48g vanadyl oxalate, 5.74g cesium sulfate, 5.03g niobium oxalate, and 240mL formamide; mix the solution with 765.6g titanium dioxide, 8.44g antimony trioxide, and add 10% to 15% of the mass of solid matter The vinyl acetate / ethylene copolymer emulsion is mixed and ground in a ball mill for 2 to 3 hours, emulsified into a uniform suspension, and the viscosity of the suspension is controlled to be 11Pa·S~15Pa·S.

[0062] Add the prepared suspension into the mixing tank in the feeding system of the spraying equipment and stir, put 2000 grams of talc ring carrier with an outer diameter of 8mm, a height of 6mm, and a wall thickness of 1.5mm in a drum with a diameter of 500mm, and control the speed at 5 ~10rpm; turn on the hot air to preheat the carrier, when the temperature of the carrier reaches 100°C~150°C, preferably 120°C~130°C, open the feeding nozzle, spray the suspension of catalytically active substances on the surface of the carrier, and dr...

Embodiment 2

[0067] 100.22g of vanadyl oxalate, 1.13g of cesium sulfate, 12.45g of niobium oxalate, 5.74g of ammonium dihydrogen phosphate, and 240mL of formamide were formulated into a solution, and the solution was mixed with 696g of titanium dioxide and 18.60g of antimony trioxide, and the mass of the solid was added 10%-15% vinyl acetate-ethylene copolymer emulsion is placed in a ball mill to mix and emulsify into a uniform suspension, and the viscosity of the suspension is controlled to be 11Pa.S-15Pa.S. Catalyst 2 was prepared according to the method described in Example 1.

Embodiment 3

[0069] 104.04g of vanadyl oxalate, 0.57g of cesium sulfate, 6.07g of niobium oxalate, 5.74g of ammonium dihydrogen phosphate, and 240mL of formamide were formulated into a solution, and the solution was mixed with 696g of titanium dioxide, 25.05g of antimony trioxide, and added solids The vinyl acetate-ethylene copolymer emulsion with a mass of 10% to 15% is placed in a ball mill to be mixed and emulsified into a uniform suspension, and the viscosity of the suspension is controlled to be 11Pa·S˜15Pa·S. Catalyst 3 was prepared according to the method described in Example 1.

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PUM

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Abstract

The invention relates to a catalyst that is used in the catalytic oxidation reaction between raw materials of ortho-xylene and/or naphthalin and gas phase that contains molecular oxygen for producing phthalic anhydride, as well as a preparation method of the catalyst. The catalyst comprises an inert imperforated carrier material and a catalytic active substance layer that is coated on the carrier and contains vanadic oxide, diantimony trioxide, titanium dioxide and a cementing agent, etc. In a preparation process of the catalyst, serum is firstly prepared, viscosity of the catalytic active substance serum is controlled, the carrier is heated, the serum is sprayed onto the carrier in a barrate, and the carrier is dried by hot wind. The catalyst is used for the field of chemical industry.

Description

technical field [0001] The invention relates to a phthalic anhydride catalyst and a preparation method thereof, in particular to a catalyst used for preparing phthalic anhydride by gas-phase catalytic oxidation reaction of ortho-xylene and naphthalene as raw materials and a gas containing molecular oxygen, and a preparation method of the catalyst. Background technique [0002] To produce phthalic anhydride by fixed-bed catalytic oxidation of o-xylene and / or naphthalene as raw material, V-Ti type supported catalyst is generally used, that is, V 2 o 5 and TiO 2 It is a catalytically active substance, and at least one compound selected from the group consisting of alkali metal, Sb, P, Nb, Ag, Zr, W, Au, Sn, Bi is added as a cocatalyst, and a non-porous inert carrier material is used. The catalyst is prepared by coating the catalytically active material on an inert, non-porous carrier in the form of a thin layer, usually 0.02 to 2 mm. [0003] The catalyst used in the fixed-b...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J21/06C07D307/89
Inventor 盛丁杰吴保军罗国庆王刚卢灏赵彦霞王瑞璞胡英花
Owner CHINA PETROLEUM & CHEM CORP
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