Process for synthesizing propylene glycol ether

A technology of propylene glycol ether and propylene, which is applied in the direction of ether preparation, alkylene oxide preparation ether, organic chemistry, etc., can solve the problems of low product selectivity, harsh reaction conditions, and difficulty in realization, and achieve complex and simple process improvement. Effect

Active Publication Date: 2007-04-11
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the catalyst used in this patent is complicated, and the reaction temperature for the synthesis of propylene glycol ether is harsh, and it is required to be controlled at around 0°C, otherwise a large amount of by-products will easily be produced
However, propylene epoxidation is a strong exothermic process. Controlling the reaction temperature at around 0°C requires a lot of energy consumption and is difficult to achieve. As a result, the synthesis of propylene glycol ether is complicated, the reaction conditions are harsh, and the product selectivity is low. Carry out industrialized practical production application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dilute 15g of titanium-silicon molecular sieve catalyst with 10g of quartz sand and put it in a fixed-bed reactor. The molar ratio of methanol to hydrogen peroxide is 50:1, and the molar ratio of propylene to hydrogen peroxide is 1:1. Methanol and hydrogen peroxide are respectively injected into the reactor with metering pumps, and propylene enters the reactor through a gas mass flow meter. The three reactants react with the titanium-silicon molecular sieve catalyst. , Synthesis of propylene glycol monomethyl ether. Reaction conditions: reaction temperature 0°C, reaction pressure 0.5MPa, reaction bed liquid space velocity 65h -1 . The obtained product was analyzed by chromatography, and the selectivity of propylene glycol monomethyl ether was 93.25%, and the conversion rate of hydrogen peroxide was 98.36%.

Embodiment 2

[0021] The titanium-silicon molecular sieve is installed in a slurry bed reactor, the total liquid volume is 3 liters, and the catalyst loading accounts for 5% of the total liquid volume. The molar ratio of ethanol to hydrogen peroxide is 60:1, the molar ratio of propylene to hydrogen peroxide is 0.5:1, the reaction conditions: reaction temperature 60°C, reaction pressure 8.5MPa, reaction bed liquid space velocity 8.0h -1 , other steps are with embodiment 1. The obtained product was analyzed by chromatography, and the selectivity of propylene glycol monoethyl ether was 90.10%, and the conversion rate of hydrogen peroxide was 95.21%.

Embodiment 3

[0023] Mix 10g of titanium-silicon molecular sieve and 10g of sodium ethoxide evenly, dilute with 20g of quartz sand, and install it in a fixed-bed reactor. The molar ratio of propanol and hydrogen peroxide is 1:1, the molar ratio of propylene and hydrogen peroxide is 6:1, the reaction conditions: reaction temperature 80°C, reaction pressure 2.1MPa, reaction bed liquid space velocity 0.1h -1 , other steps are with embodiment 1. The obtained product is analyzed by chromatography, and the selectivity of propylene glycol monopropyl ether is 92.32%, and the conversion rate of hydrogen peroxide is 99.5%.

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Abstract

The present invention discloses process of synthesizing propylene glycol ether. Alcohol, propylene and hydrogen peroxide in the molar ratio of (1-60) to (0.5-10) to 1 are set inside a reactor with catalyst, propylene and hydrogen peroxide produce epoxidation reaction to produce epoxy propane, and the produced epoxy propane and alcohol produce etherification reaction to produce propylene glycol ether. The reaction conditions include reaction temperature of 0-200 deg.c, reaction pressure of 0.5-8.5 MPa, and space velocity of liquid hydrogen peroxide and alcohol of 0.1-65 / hr. The present invention has simple process, environment friendship and propylene glycol ether selectivity up to 90 %.

Description

1. Technical field [0001] The invention relates to a method for synthesizing propylene glycol ether, in particular to a method for synthesizing propylene glycol ether in one step from propylene. 2. Background technology [0002] Since the chemical structure of propylene glycol ether has two groups with strong dissolving ability-ether bond and hydroxyl group, the former is lipophilic and can dissolve hydrophobic compounds; the latter is hydrophilic and can dissolve water-soluble compounds, so it is A universal solvent with excellent performance, known as "universal" solvent. Its main use is as an industrial solvent, and it is widely used in coatings, cleaning, printing, leather, etc. In the paint industry, it can be used as a solvent for alkyd resin, epoxy resin, acrylic resin, polyurethane paint, etc. The prepared paint film has the advantages of smoothness, smoothness, and good fastness. In ink production, using propylene glycol ether, some formulations can be changed to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/10C07C41/03
Inventor 王伟林榕伟何驰剑伍小驹高计皂
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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