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Solid catalyst for synthesizing propylene glycol ether and its preparing process

A solid catalyst, propylene glycol ether technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as pollution, storage and transportation inconvenience, and achieve conversion High yield, simple preparation method and high isomerization ratio

Inactive Publication Date: 2008-05-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is characterized in that the catalyst and the product do not need to be separated, and the ratio of product isomers (primary ether: secondary ether) is high (generally 95-97:5-3), but the solid base catalyst is easily polluted by water and carbon dioxide in the air, and there is storage and transportation inconvenience, while the activity stability needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 10g Zn(OH) 2 , 15g pseudoboehmite and 2gMg(OH) 2 Mix the powder thoroughly and evenly, then add 6ml of deionized water, and knead until the water is mixed evenly, and the uniformly mixed material is formed into a bar on a bar machine, and the formed sample is dried at 110°C for 12 hours. Raise to 600°C at 10°C / min and keep the temperature constant for 4h to obtain the catalyst for this reaction. Put 5ml of catalyst into the fixed bed reactor, the molar ratio of methanol and propylene oxide is 5:1, and the liquid hourly space velocity is 3.5h -1 , bed temperature 100 ° C, reaction pressure 8atm, the product was cooled by ice-water mixture, and analyzed by gas chromatography. The results are shown in Table 1.

Embodiment 2

[0022] 15g Zn(OH) 2 , 15g pseudoboehmite and 3.1gMg(OH) 2 Mix the powder well, then add 6ml of deionized water, and knead until the water is mixed evenly. The uniformly mixed material is formed into a bar on a bar machine. The formed sample is dried at 110C for 12 hours, and the heating rate is 10C. / min rises to 600C, constant temperature 4 hours, obtains this reaction catalyst. Put 5ml of catalyst into the fixed bed reactor, the molar ratio of methanol and propylene oxide is 5:1, and the liquid hourly space velocity is 3.5h -1 , Bed temperature 100C, reaction pressure 8atm, the product was cooled by ice-water mixture, and analyzed by gas chromatography. The results are shown in Table 1.

Embodiment 3

[0024] 6g Zn(OH) 2 , 15g pseudoboehmite and 2.5gMg(OH) 2 Mix the powder thoroughly and evenly, then add 6ml of deionized water, and knead until the water is mixed evenly, and the uniformly mixed material is formed into a bar on a bar machine, and the formed sample is dried at 110°C for 12 hours. Raise to 600°C at 10°C / min and keep the temperature constant for 4h to obtain the catalyst for this reaction. Put 5ml of catalyst into the fixed bed reactor, the molar ratio of methanol and propylene oxide is 5:1, and the liquid hourly space velocity is 3.5h -1 , bed temperature 100 ° C, reaction pressure 8atm, the product was cooled by ice-water mixture, and analyzed by gas chromatography. The results are shown in Table 1.

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PUM

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Abstract

The catalyst for synthesizing propylene glycol ether is prepared with Zn(OH)2 or zinc citrate, pseudo boehmite and Mg(OH)2, and through mechanical kneading, extruding to form, stoving at 110 deg.c for 12 hr and roasting at 600 deg.c for 4 hr. It contains ZnO in 10-60 wt%, MgO in 6-15 wt% and Al2O3 in 30-80 wt%. The preparation process is simple, easy operation, less pollution caused by CO2 and water in the air and environment friendly, and the catalyst has high propylene oxide converting rate, high isomerization ratio and high propylene glycol ether selectivity.

Description

Technical field: [0001] The invention belongs to the field of fine chemicals, and relates to a solid catalyst and a preparation method thereof, in particular to a novel solid catalyst for synthesizing flash glycol ether by a propylene oxide method and a preparation method thereof. Background technique [0002] Propylene glycol ether, as a low-toxic high-grade solvent product, is widely used in inks, paints, printing, dyes, electronic chemicals and textile industries, and is gradually replacing highly toxic glycol ethers. In the past ten years There is rapid development in. Industrially, propylene glycol ether is synthesized by propylene oxide method, that is, it is synthesized by propylene oxide and lower aliphatic alcohol under the action of a catalyst. Due to the ring-opening orientation problem of epoxy flashane, there are two isomers in the product, 1-alkoxyl-2-propanol (primary ether) and 2-alkoxyl-1-propanol (secondary ether), According to the research results, prima...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J21/10B01J21/04C07C43/10
Inventor 张文郁班青
Owner QILU UNIV OF TECH