Method for preparing catalyst for glycerin dehydration, and method for preparing acrolein

a technology of glycerin and catalyst, which is applied in the direction of catalyst activation/preparation, metal/metal-oxide/metal-hydroxide catalyst, etc., can solve the problems of rapid reduction of catalytic activity and limit the use of catalysts for the production of acrolein with high purity, and achieves the effects of improving acrolein selectivity, reducing by-product formation, and high catalytic activity during reaction

Active Publication Date: 2016-02-04
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038]According to the present invention, provided are a method for preparing a catalyst for glycerin dehydration, which is able to minimize by-product formation to improve acrolein selectivity and to maintain high catalytic activity during the reaction, and a method for preparing acrolein.
[0039]The present invention will be described in more detail with reference to the following examples. However, the following examples are for the illustrative purpose only, and the present invention is not intended to be limited by these examples.

Problems solved by technology

However, since the catalysts which were previously used to prepare acrolein from glycerin produce by-products such as hydroxy acetone, hydroxy propanone, propane aldehyde, acetaldehyde, acetone, and polycondensation products of glycerin, there is a limitation in the use of the catalysts for the production of acrolein with high purity.
Further, there is a problem that when the catalyst is supported on a carrier, the catalytic activity is rapidly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040]A predetermined amount (7.723 g) of cerium nitrate (Ce(NO3)2.6H2O, YAKURI, 98.0%) was dissolved in 8 ml of distilled water in a beaker so as to prepare a cerium precursor solution. Further, 3.366 g of citric acid (YAKURI, 99.99%) at the same molar equivalent as cerium nitrate was dissolved in 4 ml of distilled water in another beaker so as to prepare a citric acid solution. Then, the cerium nitrate solution and the citric acid solution thus prepared were mixed with each other, and stirred for 30 minutes to completely mix the two solutions. While the mixed solution was heated and stirred at a temperature of 70° C., distilled water in the solution was evaporated to form a sol, and the sol thus formed was continuously heated for about 3 hours to form a gel. After gel formation, 2.211 g of phosphate (H3PO4 DAEJUNG, 85%) solution at an equivalent weight of 1.1 was added dropwise. Then, the gel was allowed to swell by continuous heating and stirring, and dried in an oven at 170° C. ...

example 2

[0041]A predetermined amount (0.565 g) of cerium nitrate (Ce(NO3)2.6H2O, YAKURI, 98.0%) and 0.739 g of citric acid (YAKURI, 99.99%) at the same molar equivalent as cerium nitrate were mixed with each other, and then a cerium precursor and citric acid which were weighed so as to correspond to the pore volume of 2.7 g of silica (SYLOPOL, SP948) as a carrier were dissolved in distilled water. Then, the precursor solution thus prepared was added to 2.7 g of the silica carrier and the solution was allowed to be absorbed into the pores of the carrier by stirring. Thereafter, distilled water remaining in the pores was completely removed by drying in an oven at 110° C. for 5 hours or longer. A phosphate solution prepared by dissolving 2.294 g of phosphate (H3PO4 DAEJUNG, 85%) at an equivalent weight of 2 in distilled water in a volume corresponding to the pore volume of the carrier was also supported in the same manner, and dried in an oven at 110° C. for 12 hours or longer, and then calcin...

examples 3 to 5

[0042]A 15 wt % CePO4 / SiO2 catalyst was prepared in the same manner as in the method for preparing the supported catalyst of Example 2, except that the molar ratio of cerium nitrate and phosphate was changed to 1:3 (Example 3) or 1:4 (Example 4).

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Abstract

The present invention relates to a method for preparing a catalyst for glycerin dehydration, a catalyst for glycerin dehydration prepared thereby, and a method for preparing acrolein. More particularly, the catalyst for glycerin dehydration prepared by the preparation method is able to minimize by-product formation to improve acrolein selectivity and to maintain high catalytic activity during the reaction.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for preparing a catalyst for dehydration and a method for preparing acrolein, and particularly, to a method for preparing a catalyst for glycerin dehydration, which is able to minimize by-product formation to improve acrolein selectivity and to maintain high catalytic activity during the reaction, and a method for preparing acrolein.BACKGROUND OF ART[0002]Acrolein is a simple unsaturated aldehyde compound including an incomplete reactive group and having high reactivity, and the main uses thereof are as an intermediate in the synthesis of numerous compounds. In particular, acrolein has been widely used as an intermediate in the synthesis of acrylic acid and its esters, superabsorbent polymers, animal feed supplements, food supplements, etc.[0003]Conventionally, acrolein has been prepared by a selective gas-phase oxidation reaction with atmospheric oxygen using a starting material, propylene, which is obtained from the pr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J27/182B01J37/08B01J37/28C01B25/37C07C45/51
CPCB01J27/182C01B25/37C07C45/512B01J37/08B01J37/28B01J23/10C07C45/52B01J37/036C07C47/22B01J37/04
Inventor JOE, WANG RAECHOI, JUN SEONKIM, JI YEONCHEON, JOO YOUNG
Owner LG CHEM LTD
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