Catalyst for preparing phthalic anhydride as well as preparation method and application thereof

A catalyst, phthalic anhydride technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unmentioned catalyst life, hot spot temperature, etc., to maintain catalyst performance, prolong catalyst life, The effect of improving activity and selectivity

Active Publication Date: 2018-06-01
DALIAN DRAGON WIN CATALYTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above patents, the load is at the upper-middle level of the current phthalic anhydride technology, and the hot spot temperature is generally high. Only one patent is below 425°C, and none of them mentions catalyst life.

Method used

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  • Catalyst for preparing phthalic anhydride as well as preparation method and application thereof
  • Catalyst for preparing phthalic anhydride as well as preparation method and application thereof
  • Catalyst for preparing phthalic anhydride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Carrier treatment: The carrier is a talc ring with an outer diameter of 7*7*4mm. The carrier is screened, washed with deionized water, and dried for later use.

[0036] Slurry preparation:

[0037] (1) Add 2.50 g of tungsten phosphate to 700 mL of 50% ethanol aqueous solution, then add 0.28 g of cesium carbonate dropwise, and stir for 12 hours at room temperature.

[0038] (2) Add 17.1g vanadyl oxalate to the solution prepared in (1), then add 6.58g silver nitrate, 158g titanium dioxide, 10g organic binder (acrylic acid:maleic acid=3:1, weight ratio, other Embodiment is the same) and 120mL formamide. Stir evenly, and use a homogenizing pump to homogenize at 4000 rpm for 30 minutes to form a suspension.

[0039] Spray drying:

[0040] Put the treated 1000g carrier into the spraying machine, heat the carrier to 105°C by hot air, start spraying, and control the temperature during spraying to 110°C. After the slurry is atomized, it is sprayed onto the turning carrier. ...

Embodiment 2

[0046] The preparation method is the same as in Example 1, and the amounts of each component are respectively: 750 ml of 50% ethanol aqueous solution, 6.54 g of phosphomolybdic acid, 1.68 g of cesium carbonate, 20.3 g of vanadyl oxalate, 15.0 g of silver nitrate, 168 g of titanium dioxide, and 168 g of trichloride 0.1g of iron, 0.5g of antimony trioxide, 2.0g of stannous chloride, 11g of binder, and 120ml of formamide. Catalyst product B was obtained.

Embodiment 3

[0050] The preparation method is the same as in Example 1, and the amounts of each component are: 800ml of 50% ethanol aqueous solution, 7.8g of phosphotungstic acid, 4.77g of phosphomolybdic acid, 2.36g of cesium carbonate, 26.0g of vanadyl oxalate, 180g of titanium dioxide, and 0.5 g of iron oxide, 1.0 g of antimony trioxide, 1.0 g of stannous chloride, 12 g of binder, and 120 ml of formamide. Catalyst product C was obtained.

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PUM

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Abstract

The invention relates to a catalyst for preparing phthalic anhydride as well as a preparation method and application thereof and is especially suitable for ortho-xylene or naphthalene gas phase oxidation to prepare the phthalic anhydride. The catalyst for preparing the phthalic anhydride is prepared from active ingredients, wherein the active ingredients are prepared from 0.01 to 20% of polyoxometalate and the balance of oxide or salt by mass percent, wherein the polyoxometalate is of a keggin structure and is prepared from any one or combination of any two of tungstophoric acid cesium and phosphomolybdic acid cesium according to any proportion; the oxide is at least one of V2O5, TiO2, Sb2O3, P2O5, Cs2O, Fe2O3, WO2, MoO3, SnO2 or Ag2O. The catalyst disclosed by the invention can reduce a reaction hot-spot temperature through a decomposing and controlled-release effect of the polyoxometalate and an adjusting effect to a catalyst acidity; thus, selectivity of the catalyst is improved, and service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a catalyst for preparing phthalic anhydride, a preparation method and application thereof, and is particularly suitable for preparing phthalic anhydride by gas-phase oxidation of o-xylene or naphthalene. Background technique [0002] Phthalic anhydride is an important organic chemical raw material, which is mostly prepared by gas-phase catalytic oxidation of o-xylene or naphthalene, and the active components of the catalyst used are mainly vanadium pentoxide and titanium dioxide. In the development of catalyst technology for many years, people have tried various metal and metalloid oxides and salts (excluding heteropoly acid salts) to improve catalyst performance. ZL97119198.0 introduces a catalyst for producing phthalic anhydride, the active components of which are vanadium pentoxide, titanium dioxide, phosphorus pentoxide, niobium pentoxide and rubidium oxide. The load is 60-80g / standard cubic meter of air, and the weight yi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188B01J27/19B01J27/228B01J37/02C07D307/89
CPCB01J27/188B01J27/19B01J27/228B01J37/0217B01J37/0236C07D307/89
Inventor 刘竖毅董军营
Owner DALIAN DRAGON WIN CATALYTIC
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