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Multi-layered catalyst for producing phthalic anhydride

A technology of phthalic anhydride and multi-layer catalyst, which is applied in the direction of oxidative preparation of carboxylic acid, catalyst activation/preparation, physical/chemical process catalyst, etc.

Inactive Publication Date: 2011-10-12
SUD CHEM IP GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, PSA yield still needs to be improved

Method used

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  • Multi-layered catalyst for producing phthalic anhydride
  • Multi-layered catalyst for producing phthalic anhydride
  • Multi-layered catalyst for producing phthalic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] Example 1: Preparation of catalyst A

[0140] To prepare catalyst A, it has an active material ratio of 8% by weight and a composition of 7.5% by weight of vanadium pentoxide, 3.2% by weight of antimony trioxide, 0.40% by weight of cesium (calculated as cesium), 0.2% by weight The phosphorus (calculated as phosphorus) and the rest is titanium dioxide. In the so-called vortex bed coating machine, 2600g of a hollow cylindrical talc shaped body with a size of 8×6×5mm is used in a suspension composed of the following substances in 70 Coating at a temperature of ℃: 17.9g vanadium pentoxide, 7.6g antimony trioxide, 1.3g cesium sulfate, 1.9g ammonium dihydrogen phosphate, 211.1g, the BET surface area is 21m 2 / g of titanium dioxide, 130.5g of 50% water and vinyl acetate / ethylene copolymer ( EP 65W, a binder composed of a dispersion of Wacker Company), and 2000 g of water. The active substance is applied in a thin layer.

Embodiment 2

[0141] Example 2: Preparation of Catalyst B

[0142] To prepare catalyst B, it has an active material ratio of 8% by weight and a composition of 7.5% by weight of vanadium pentoxide, 3.2% by weight of antimony trioxide, 0.20% by weight of cesium (calculated as cesium), 0.2% by weight The phosphorus (calculated as phosphorus) and the rest is titanium dioxide. In a so-called vortex bed coating machine, 2200g of a hollow cylindrical talc shaped body with a size of 8×6×5mm is used in a suspension composed of the following substances at 70 Coating at a temperature of ℃: 15.4g vanadium pentoxide, 6.6g antimony trioxide, 0.5g cesium carbonate, 1.5g ammonium dihydrogen phosphate, 182.9g, the BET surface area is 21m 2 / g of titanium dioxide, 110.7g of 50% water and vinyl acetate / ethylene copolymer ( EP 65W, a binder composed of a dispersion of Wacker Company), and 2000 g of water. The active substance is applied in a thin layer.

Embodiment 3

[0143] Example 3: Preparation of Catalyst C

[0144] To prepare catalyst C, it has an active material ratio of 8% by weight and a composition of 7.5% by weight of vanadium pentoxide, 3.2% by weight of antimony trioxide, 0.2% by weight of phosphorus (calculated as phosphorus), and the remainder is titanium dioxide , In a so-called vortex bed coating machine, 2200g of a hollow cylindrical shape of talc with a size of 8×6×5mm is coated with a suspension composed of the following substances at a temperature of 70°C: 13.35g pentoxide Vanadium, 5.7g antimony trioxide, 1.34g ammonium dihydrogen phosphate, 158.65g BET surface area is 21m 2 / g of titanium dioxide, 109.4g of 50% water and vinyl acetate / ethylene copolymer ( EP 65W, a binder composed of a dispersion of Wacker Company), and 2000 g of water. The active substance is applied in a thin layer.

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Abstract

The present invention relates to a catalyst for preparing phthalic anhydride by gas phase oxidation of o-xylene and / or naphthalene, comprising at least three catalyst zones which have different compositions and, from the gas inlet side toward the gas outlet side, are referred to as first, second and third catalyst zone, the catalyst zones having in each case an active composition comprising TiO2,and the active composition content decreasing from the first catalyst zone disposed toward the gas inlet side to the third catalyst zone disposed toward the gas outlet side, with the proviso that (a)the first catalyst zone has an active composition content between about 7 and 12% by weight, (b) the second catalyst zone has an active composition content in the range between 6 and 11% by weight, the active composition content of the second catalyst zone being less than or equal to the active composition content of the first catalyst zone, and (c) the third catalyst zone has an active composition content in the range between 5 and 10% by weight, the active composition content of the third catalyst zone being less than or equal to the active composition content of the second catalyst zone. Also described is a preferred process for preparing such a catalyst and the preferred use of the titanium dioxide used in accordance with the invention.

Description

Technical field [0001] The present invention relates to a multilayer catalyst, that is, a catalyst having three or more different layers (film layers), which is used to prepare phthalic anhydride by gas phase oxidation of o-xylene and / or naphthalene ( PSA), in which the active material content decreases from the first catalyst layer toward the gas inlet side to the catalyst layer toward the gas outlet side. Background technique [0002] The industrial production of phthalic anhydride is realized by the gas phase catalytic oxidation of o-xylene and / or naphthalene. For this purpose, the reactor is filled with a catalyst suitable for the reaction, preferably a so-called tube bundle reactor, in which a large number of tubes are arranged in parallel and composed of the one or more hydrocarbons and oxygen-containing gas, for example The mixture of air flows through the catalyst from above or from below. Since this oxidation reaction is strongly exothermic, it is necessary to surround...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J37/02B01J27/198C07C51/265B01J35/00B01J35/10C07C51/31
CPCB01J21/063B01J23/002B01J23/22B01J27/198B01J37/0219B01J37/0221B01J2523/00C07C51/265C07C51/313B01J35/19B01J35/397B01J35/60B01J35/613B01J35/651C07C63/16B01J2523/47B01J2523/51B01J2523/53B01J2523/55B01J2523/15
Inventor C·古克尔M·涅德梅尔M·埃斯腾费尔德
Owner SUD CHEM IP GMBH & CO KG