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Tungsten-containing multiphase catalyst for cyclopentene line to prepare glutaraldehyde and its preparation method

A technology of glutaraldehyde and cyclopentene is applied in the field of heterogeneous tungsten-containing catalysts and their preparation, which can solve the problems of limiting the industrial application of supported catalysts, weak support, and short catalyst life, and is convenient for large-scale industrial production. , low price, long service life

Inactive Publication Date: 2004-11-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because these supported tungstic acid catalysts are only dispersed on the surface of the carrier, the interaction with the carrier is very weak, and it is easy to fall off during the reaction, resulting in a very short catalyst life; and the preparation of the carrier requires a large amount of expensive ortho-silicon Ethyl titanate or butyl titanate, increasing the cost
These disadvantages severely limit the industrial application of these supported catalysts

Method used

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  • Tungsten-containing multiphase catalyst for cyclopentene line to prepare glutaraldehyde and its preparation method
  • Tungsten-containing multiphase catalyst for cyclopentene line to prepare glutaraldehyde and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: take by weighing 5.83 grams of sodium silicate, 2.45 grams of CTAB are dissolved in 162 milliliters of distilled water, place a 250 milliliters of three-necked flasks, add 2 milliliters of concentrations of 0.2 mol / liter to this solution with a pipette Sodium tungstate solution. The temperature of the oil bath was maintained at 85°C and 7.5 mL of ethyl acetate was added by pipette while the above solution was stirred mechanically. Continue mechanical stirring for 6 minutes, then use electromagnetic stirring to maintain a medium stirring speed and install a condenser, stop stirring after aging for 24 hours, pour the solid-liquid mixture in the three-necked bottle into a centrifuge tube, and centrifuge at 2000 rpm After 10 minutes, the centrifugal liquid was poured out, and the solid sediment was washed with 500 ml of distilled water. After centrifugation again, the solid was dried under an infrared lamp, then transferred to an oven at 120°C for 2 hours, and...

Embodiment 2

[0021] Example 2: 3.3 milliliters of sodium tungstate (0.2 mol / liter) was pipetted and added to the solution, and the rest of the synthesis conditions were the same as in Example 1. A mesoporous molecular sieve catalyst with a molar ratio of silicon to tungsten of 30 can be obtained, denoted as 2#.

Embodiment 3

[0022] Example 3: Change the content of tungsten, and refer to Example 1 for the remaining conditions. A series of mesoporous molecular sieve catalysts with a silicon-tungsten molar ratio of 80, 70, 60, 40, and 20 can be obtained in turn, respectively marked as: 3#, 4#, 5#, 6# and 7# catalysts.

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Abstract

The present invention relates to a new type multiphase tungsten-containing catalyst for cyclopentene line to prepare glutaric dialdehyde and its production method. Said catalyst is obtained by utilizing synthesis method of in-situ adding tungstic acid precursor in the course of synthesizing holo-silicon mesopore molecular sieve to introduce tungsten component into the skeleton of mesopore molecular sieve. The silicon source adopted by said invention is sodium silicate aqueous solution, and its hydrolysis agent is an ester compound capable of slowly-releasing weak acidity, its tungsten source is a soluble tungsten-containing compound and its template agent is hexadecyltrimethyl ammonium bromide. Said catalyst possesses high catalytic activity, and is suitable for industrial large-scale application.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a heterogeneous tungsten-containing catalyst for preparing glutaraldehyde by oxidizing cyclopentene with aqueous hydrogen peroxide solution as an oxidant and a preparation method thereof. Background technique [0002] Glutaraldehyde is an extremely important chemical product, which is widely used in tanning, oil exploration and medical and health industries, and is in great demand. At present, the acrolein route is used in industry to produce glutaraldehyde. The source of raw materials for this method is difficult, the operation is complicated, and the cost of the glutaraldehyde produced is relatively high. Over the years, the synthetic route using cyclopentadiene, one of the cheap carbon 5 fractions, as raw material has received extensive attention. The key technical part in the method for the preparation of glutaraldehyde by the hydrogenation product cyclopentene of cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J29/035B01J37/00C07C45/60C07C47/12
Inventor 戴维林陈浩曹勇
Owner FUDAN UNIV