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Novel catalysts and process for dehydrating glycerol

a technology of catalysts and glycerol, which is applied in the preparation of carbonyl compounds by oxidation, physical/chemical process catalysts, metal/metal-oxide/metal-hydroxide catalysts, etc., can solve the problems of unsuitable industrial scale processes, and achieve the effect of low carbonization tendency and easy regeneration

Inactive Publication Date: 2008-07-31
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]It is an object of the invention to provide a catalyst for the dehydration of glycerol, which has a relatively low carbonization tendency and is easy to regenerate.

Problems solved by technology

Owing to the low yields and the high salt burdens, this process is, however, not suitable for the industrial scale.

Method used

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  • Novel catalysts and process for dehydrating glycerol
  • Novel catalysts and process for dehydrating glycerol

Examples

Experimental program
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Effect test

example 1

[0055]Comparative Example 1 was repeated, except that tungstic acid pressed to tablets was used as the catalyst. At a reactor temperature of 260° C., a full conversion and a yield of 79% were achieved within the first 5 h. Within the next operating hours, the conversion and, correspondingly, the yield were reduced significantly. In the further course, a decline in the yield by approx. 5% per 10 h was detected. After the catalyst had been flowed through exclusively with a hydrogen stream of 4 l (STP) / h at a temperature of 350° C. for 10 h, the activity of the catalyst was improved significantly. The glycerol conversion was again complete at the start. In the further course, the conversion and the yield were reduced as before the regeneration. This cyclic operation of glycerol dehydration and regeneration of the catalyst was repeated three times within 300 h. After the unregenerated catalyst had been deinstalled, it was black in colour. The carbon content of the catalyst was 22% by we...

example 2

[0056]Comparative Example 1 was repeated, except that tungstic acid pressed to tablets was used as the catalyst. This catalyst was additionally impregnated with 1% by weight of Pd. To this end, lead acetate was used by means of incipient wetness. At a reactor temperature of 260° C., a full conversion and a yield of 77% were achieved within the first 5 h. Within the next operating hours, the conversion and, correspondingly, the yield were reduced significantly. After the catalyst had been flowed through exclusively with a hydrogen stream of 4 l (STP) / h at a temperature of 350° C. for 10 h, the activity of the catalyst was improved significantly. The glycerol conversion was then complete again at the start. Compared to Example 1, the decline in the conversion in the dehydration reaction was significantly lower after the regeneration, and the high conversion level was maintained for longer.

example 3

[0057]Comparative Example 1 was repeated, except that a powder mixture of 15% by weight of montmorillonite and 85% by weight of WO3 / ZrO2 (11% by weight of WO3 on ZrO2) pressed to tablets was used as the catalyst. At a reactor temperature of 260° C., a full conversion and a yield of 79% were achieved within the first 5 h. Within the next operating hours, the conversion and, correspondingly, the yield were reduced. After the catalyst had been flowed through exclusively with an air stream of 4 l (STP) / h at a temperature of 300° C. for 5 h, the activity of the catalyst was improved significantly. During the first hour of the regeneration, the air was diluted 1:1 with nitrogen in order to limit the exothermicity as a result of the burning-off of the coke. The glycerol conversion was again complete at the start after the regeneration. After 6 cycles of dehydration and of regeneration had been passed through, the regeneration temperature was increased to 390° C. In the subsequent dehydrati...

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Abstract

A process for preparing acrolein from glycerol using an acidic solid-state catalyst which comprises tungsten compounds and further promoters.

Description

INTRODUCTION AND BACKGROUND [0001]The invention relates to a process for preparing acrolein from glycerol using an acidic catalyst which comprises tungsten compounds and at least one further promoter.[0002]Acrolein is an important intermediate and is of great economic significance for the preparation of acrylic acid, D,L-methionine and the methionine hydroxy analogue 2-hydroxy-4-methylthiobutyric acid (MHA). Methionine is an essential amino acid which is used, inter alia, as a supplement in feeds. Nutrition-improving feed additives are nowadays an indispensable constituent in animal nutrition. They serve for better utilization of the food supply, stimulate growth and promote protein formation. One of the most important of these additives is the essential amino acid methionine, which assumes a prominent position as a feed additive in poultry breeding in particular. In this field, though, methionine replacements such as methionine hydroxy analogue (abbreviated to MHA) also have not in...

Claims

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Application Information

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IPC IPC(8): C07C45/29C07C319/02B01J29/04B01J23/10B01J27/188B01J27/24B01J27/20B01J23/30B01J21/16C07C319/14
CPCB01J23/30B01J23/6527C07C319/18C07C45/52B01J37/04B01J23/888B01J23/92B01J23/94B01J23/96B01J29/076B01J35/002B01J37/0009B01J37/0201C07C47/22C07C323/22Y02P20/584B01J35/30
Inventor REDLINGSHOFER, HUBERTWECKBECKER, CHRISTOPHHUTHMACHER, KLAUSDORFLEIN, ANDREAS
Owner EVONIK DEGUSSA GMBH
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