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Method for producing phthalic anhydride

A kind of technology of phthalic anhydride and catalyst, applied in the field of preparing phthalic anhydride

Inactive Publication Date: 2003-12-24
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Despite the improvements proposed above, long start-up times of 2-8 weeks or more are still required to date

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: preparation catalyst I (a)

[0024] 700 g of ring-shaped talc (magnesium silicate) with an outer diameter of 8 mm, a length of 6 mm and a wall thickness of 1.5 mm was heated to 210 ° C in a coating cylinder and coated with a BET surface area of ​​21 m 2 400.0 grams of anatase / g, 57.6 grams of vanadyl oxalate, 14.4 grams of antimony trioxide, 3.3 grams of ammonium hydrogen phosphate, 2.60 grams of cesium sulfate, 618 grams of water and 128 grams of formamide for spraying until the sprayed layer The weight is 7.1% of the total weight of the finished catalyst. The catalytically active material coated in this way, the catalyst shell, contains 0.2% by weight of phosphorus (as P), 7.5% by weight of vanadium (as V 2 o 5 In terms of), 3.2% by weight of antimony (as Sb 2 o 3 ), 0.4% by weight of cesium (calculated as cesium) and 88.75% by weight of titanium dioxide.

Embodiment 2

[0025] Embodiment 2: preparation catalyst II (a)

[0026] 700 g of ring-shaped talc (magnesium silicate) with an outer diameter of 8 mm, a length of 6 mm and a wall thickness of 1.5 mm was heated to 210 ° C in a coating cylinder and coated with a BET surface area of ​​21 m 2 400.0 grams of anatase / g, 57.6 grams of vanadyl oxalate, 14.4 grams of antimony trioxide, 3.3 grams of ammonium hydrogen phosphate, 2.28 grams of cesium sulfate, 618 grams of water and 128 grams of formamide for spraying until the sprayed layer The weight is 7.5% of the total weight of the finished catalyst. The catalytically active material coated in this way, the catalyst shell, contains 0.2% by weight of phosphorus (as P), 7.5% by weight of vanadium (as V 2 o 5 In terms of), 3.2% by weight of antimony (as Sb 2 o 3 ), 0.35% by weight of cesium (calculated as cesium) and 88.8% by weight of titanium dioxide.

Embodiment 3

[0027] Embodiment 3: preparation catalyst III

[0028] 700 g of ring-shaped talc (magnesium silicate) with an outer diameter of 8 mm, a length of 6 mm and a wall thickness of 1.5 mm was heated to 210 ° C in a coating cylinder and coated with a BET surface area of ​​21 m 2 400.0 grams of anatase / g, 57.6 grams of vanadyl oxalate, 14.4 grams of antimony trioxide, 3.3 grams of ammonium hydrogen phosphate, 2.28 grams of cesium sulfate, 618 grams of water and 128 grams of formamide for spraying until the sprayed layer The weight is 6.8% of the total weight of the finished catalyst. The catalytically active material coated in this way, the catalyst shell, contains 0.2% by weight of phosphorus (as P), 7.5% by weight of vanadium (as V 2 o 5 In terms of), 3.2% by weight of antimony (as Sb 2 o 3 ), 0.35% by weight of cesium (calculated as cesium) and 88.8% by weight of titanium dioxide.

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PUM

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Abstract

The invention relates to a method for producing phthalic anhydride by catalytic vapor-phase oxidation of xylol and / or naphthalene with a gas which contains molecular oxygen, in a fixed bed, at an increased temperature and by means of at least three stacked shell catalysts. A layer comprised of catalytically active metal oxides is deposited on the core of said catalysts, said core being made of supporting material. From layer to layer, the catalyst activity increases from the gas inlet side to the gas outlet side. In addition, the activity of the catalysts of the individual layers is adjusted such that the least active catalyst comprises a smaller active mass quantity and optionally more alkali metal as doping, said alkali metal being selected from the group comprised of potassium, rubidium and cesium, than that of the catalyst of the next layer. The catalyst which is situated thereupon and which is more active comprises the same active mass quantity and less alkali metal, as doping or has a greater active mass quantity and optionally less alkali metal as doping than the catalyst of the second layer.

Description

technical field [0001] The invention relates to a process for the preparation of phthalic anhydride, in which the catalytic gas-phase oxidation of o-xylene and / or naphthalene is carried out via at least three zones of catalysts of increased activity, wherein the catalysts of these zones are boosted in a particular way active. Background technique [0002] It is known industrially that many carboxylic acids and / or carboxylic anhydrides are prepared by catalytic gas phase oxidation of aromatic hydrocarbons such as benzene, xylene, naphthalene, toluene and durene in fixed bed reactors, preferably multi-tubular reactors of. The method is used to obtain, for example, benzoic acid, maleic anhydride, phthalic anhydride, isophthalic acid, terephthalic acid or pyromellitic anhydride. The process is generally carried out by passing a mixture of molecular oxygen-containing gas, such as air, and the feedstock to be oxidized through a number of tubes arranged in a reactor. Each tube c...

Claims

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Application Information

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IPC IPC(8): B01J27/198B01J35/00B01J37/02C07D307/89
CPCB01J37/0223C07D307/89B01J27/198B01J23/002B01J2523/00B01J35/0006B01J35/19B01J2523/15B01J2523/47B01J2523/51B01J2523/53B01J2523/55C07C51/265C07C51/313
Inventor T·黑德曼H·宛捷柯
Owner BASF SE