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Vanadium/phosphorus mixed oxide catalyst precusor, active catalyst for preparing maleic anhydride and method of preparing maleic anhydride

A technology of mixed oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, etc., which can solve problems such as difficult removal

Inactive Publication Date: 2004-10-06
LONZA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] A major disadvantage of the conventional methods described above is that, even after drying, the precursors contain a certain amount of organic compounds from the organic reaction medium, presumably these compounds (i) are strongly adsorbed on the solid surface and are therefore not easily processed by washing and drying removed, or (ii) physically trapped between the crystals of the precursor, or (iii) physically or chemically trapped ("embedded") in the crystalline structure of the precursor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] In the following examples, the carbon content was determined by combustion in high temperature pure oxygen using the equipment and methods described below, and the carbon dioxide formed was detected by infrared analysis.

[0049] Equipment: ELTRA 900CS

[0050] Measuring range: 0.001-100% (weight) C

[0051] Sensitivity: 0.0001% (weight) C

[0052] Time per sample: 90 seconds

[0053] Sample size: 0.1-0.5 grams

[0054] Furnace temperature: 400-1500℃

[0055] Oxygen purity: 99.5% min.

[0056] Oxygen flow rate: 4 liters / minute

[0057] method:

[0058] The furnace was heated to 1330 °C, the oxygen flow was turned on for 10 minutes, and then the analysis was started. Choose a high carbon content detector and calibrate with a standard sample of known carbon content. The sample size used was 150 ± 10 mg.

Embodiment 1

[0075] 4.11 g V 2 o 5 and 5.11 g H 3 PO 4 (100%) was suspended in 37.5 ml of a 1,2-ethanediol / isobutanol (20 / 80 by volume) mixture. The mixture was kept stirring, heated to reflux and held at these conditions for 6 hours. The color of the mixture changed from reddish brown to dark green and finally bright blue.

[0076] The mixture was cooled to room temperature, then filtered, washing with copious amounts of isobutanol. The solid was then dried in air at 125°C for 5 hours.

[0077] The carbon content of the dried catalyst precursor was 2.3% by weight, while the residual carbon content was 1.2% by weight after the initial calcination treatment in air at 300°C.

[0078] Activation was performed as in Comparative Example 1.

Embodiment 2

[0084] 8.20 g V 2 o 5 and 10.07 g H 3 PO 4 (100%) was suspended in 75 ml of a 1,3-propanediol / isobutanol (20 / 80 by volume) mixture. The mixture was kept stirring, heated to reflux and held at these conditions for 6 hours. The color of the mixture changed from reddish brown to dark green and finally bright blue.

[0085] The mixture was cooled to room temperature, then filtered, washing with copious amounts of isobutanol. The solid was then dried in air at 125°C for 5 hours.

[0086] The carbon content of the dried catalyst precursor was 2.8% by weight, while the residual carbon content was 1.8% by weight after the initial calcination treatment in air at 300°C.

[0087] Activation was carried out according to the method described in Comparative Example 1.

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PUM

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Abstract

Active vanadium / phosphorus mixed oxide catalyst for the conversion of non-aromatic hydrocarbons, e.g., n-butane, into maleic anhydride. The catalyst is prepared from the catalyst precursor, that is, prepared by the reaction of a source of vanadium in an organic medium in the presence of a phosphorus source. The organic medium is (a) isobutyl alcohol or a mixture of isobutyl alcohol and benzyl alcohol and (b) a polyol. The catalyst precursor is transformed into the active catalyst by an activation process that includes a heat treatment that includes applying a temperature of up to 600 DEG C.

Description

[0001] The present invention is a divisional application whose filing date (international filing date) is May 30, 2000, the Chinese national application number is 00808376.2, and the title of the invention is "vanadium / phosphorus mixed oxide catalyst precursor". technical field [0002] The present invention relates to vanadium / phosphorus mixed oxide catalyst precursors, methods of converting them into active catalysts, and methods of using such catalysts for the production of maleic anhydride. Background technique [0003] It is known that maleic anhydride is a universal intermediate for the preparation of unsaturated polyester resins, medicines or pesticides. Maleic anhydride is usually prepared by partial oxidation of aromatic hydrocarbons (such as benzene) or non-aromatic hydrocarbons (such as n-butane). [0004] The main component of the active catalyst for the oxidation of non-aromatic hydrocarbons such as n-butane to maleic anhydride is vanadyl pyrophosphate (VO) 2 P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60B01J27/198B01J31/02B01J37/08C07B61/00C07C51/215
CPCC07C51/215B01J27/198B01J23/002B01J37/086B01J2523/00C07C57/145B01J2523/51B01J2523/55B01J37/08B01J37/04
Inventor S·阿尔博内蒂F·卡瓦尼S·利吉G·马佐尼
Owner LONZA SPA