Method of prolonging service life of catalyst in dehydration of glycerol for production of acrolein

A catalyst, acrolein technology, applied in chemical instruments and methods, separation/purification of carbonyl compounds, organic chemistry, etc. Good activity, the effect of the price without pollution

Inactive Publication Date: 2012-10-10
CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Because of the homogeneous system of glycerol dehydration, there are problems such as harsh reaction conditions and the catalyst is easy to coke and cannot be recovered, so people turn the research direction to the heterogeneous reaction system , the currently reported heterogeneous reaction device for glycerin dehydration is mainly a fixed-bed reactor, and the catalysts used include solid acid, acidic molecular sieve and immobilized heteropolyacid, etc. For example, FR695931 reported that phosphate was immobilized on pumice Above, at 400-420°C, the yield of acrolein can reach 70%, but this...

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  • Method of prolonging service life of catalyst in dehydration of glycerol for production of acrolein
  • Method of prolonging service life of catalyst in dehydration of glycerol for production of acrolein
  • Method of prolonging service life of catalyst in dehydration of glycerol for production of acrolein

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Embodiment 1～4

[0021] Weigh 3g of HPW and HSiW and 7g of active Al ground to below 40 mesh 2 o 3 and SiO 2 , put into a 100ml flask equipped with a stirrer, then add 15ml of deionized water, heat and stir in a constant temperature water bath at 60°C, dry in an oven at 100°C after 4 hours, grind to 20-30°C after tableting For this purpose, the worthwhile solid-supported catalyst is: HPW / Al 2 o 3 , HPW / SiO 2 、HSiW / Al 2 o 3 and HSiW / SiO 2 (both loads are 30%).

[0022] Fixed bed process condition A: the reaction temperature is 240°C, the volume space velocity is 15 h -1 , the concentration of glycerin aqueous solution is 15%, normal pressure, and the catalyst loading is 30%.

[0023] Fixed bed process condition B: the reaction temperature is 300°C, the volume space velocity is 6h -1 , the concentration of glycerin aqueous solution is 20%, normal pressure, and the loading capacity of catalyst is 30%.

[0024] Determination of the carbon deposition amount of the catalyst: select th...

Embodiment 5

[0029] The preferred loading is 30%HPW / Al 2 o 3 as a catalyst, the reaction temperature is 240°C, and the volume space velocity is 15 h -1 , the concentration of glycerol aqueous solution was 15%, and the normal pressure was used to investigate the change of acrolein selectivity within 100 hours. The specific results are shown in Table 2.

[0030] Table 2

[0031]

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Abstract

The invention discloses a method for prolonging the service life of catalyst in dehydration of glycerol for production of acrolein. Reaction conditions in a fixed-bed reactor are changed for reaction of aqueous solution of glycerol of certain concentration at the low temperature of 240 DEG C and high space velocity of 15h-1, the product acrolein and unreacted glycerol are separated, and thus carbon deposition of the catalyst can be well inhibited and unreacted raw materials can be recycled. By adopting the process, the carbon deposition of the catalyst can be greatly inhibited, so that the catalyst can maintain high activity in a long time. Meanwhile, the problem of low conversion rate of raw materials under the conditions can be solved due to separation of the product, and the process is efficient and environmentally friendly.

Description

technical field [0001] The present invention relates to the field of catalytic glycerin dehydration to produce acrolein. The specific method is to react glycerin aqueous solution under low temperature and high space velocity conditions in a fixed bed reactor, and separate the product acrolein from unreacted glycerin. Under this condition It can well inhibit the carbon deposition of the catalyst, and the activity of the catalyst will not decrease for a long time. Background technique [0002] Acrolein is an unsaturated aldehyde with high chemical activity and can be used to sterilize or synthesize important chemical intermediates. The traditional production process of acrolein is too dependent on the development of petroleum resources, and the preparation of acrolein by dehydration of biological glycerol is a green and efficient process method. [0003] At present, the dehydration of glycerol to acrolein is mainly carried out in homogeneous and heterogeneous systems. In the ...

Claims

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Application Information

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IPC IPC(8): C07C47/22C07C45/52C07C45/82
Inventor 张宇滕诣迪戚湧孙瑜方赓朱长林
Owner CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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