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Method for simultaneously producing 1,3-propylene glycol and 1,2-propylene glycol

A technology of propylene glycol and alkanoyloxy propanol, applied in the production field of propylene glycol, can solve problems such as low selectivity

Inactive Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conversion rate of glycerol can reach 60%, the selectivity of 1,2-propanediol can reach 50%~60%, but the selectivity of 1,3-propanediol is relatively low, generally around 10%

Method used

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  • Method for simultaneously producing 1,3-propylene glycol and 1,2-propylene glycol
  • Method for simultaneously producing 1,3-propylene glycol and 1,2-propylene glycol
  • Method for simultaneously producing 1,3-propylene glycol and 1,2-propylene glycol

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Experimental program
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Effect test

Embodiment 1

[0113] Step 1: In a 100ml reactor, add 20ml of vinyl acetate as the raw material of vinyl carboxylate, 20ml of toluene as the solvent, and 0.2g of Co 2 (CO) 8 It is an olefin hydroformylation catalyst, and the reaction kettle is sealed. Replaced with nitrogen 3 times, with CO+H 2 (by mol ratio, CO:H 2=1:1) replacement 3 times, and with CO+H 2 The pressure was charged to 2.0MPa, and the temperature was raised to 115°C reaction temperature. The reactor CO+H is passed through the pressure regulator valve 2 The pressure was adjusted and stabilized at 7.0MPa reaction pressure, the stirring speed was adjusted to 800rmp, and the hydroformylation reaction was started. CO+H consumed by the reaction 2 Indicated by the pressure change of the gas storage tank until the gas is no longer consumed as the end of the reaction. The reaction kettle is lowered to room temperature, discharges unreacted gas, analyzes the reaction product composition with gas chromatography, quantifies by int...

Embodiment 2

[0117] Implement the first step of the present invention, wherein the solvent is changed into 20ml chlorobenzene, and all the other conditions are with embodiment 1. The reaction results are: the conversion rate of vinyl acetate is 98.5%, and the selectivities of 2-acetoxypropionaldehyde and 3-acetoxypropionaldehyde are 42.0% and 57.1%, respectively.

Embodiment 3

[0119] Implement the first step of the present invention, wherein the solvent is changed into 20ml methylcyclohexane, all the other conditions are with embodiment 1. The reaction results showed that the conversion rate of vinyl acetate was 98.0%, and the selectivities of 2-acetoxypropionaldehyde and 3-acetoxypropionaldehyde were 47.0% and 52.2%, respectively.

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Abstract

The invention relates to a chemical material production method, in particular to a method for simultaneously producing 1,3-propylene glycol and 1,2-propylene glycol. Alkyl carboxylic acid vinyl ester carries out hydroformylation with carbon monoxide and hydrogen under the action of olefin hydroformylation catalyst, so that 3-alkylacyloxy propaldehyde and 2- alkylacyloxy propaldehyde are produced, the 3-alkylacyloxy propaldehyde and the 2- alkylacyloxy propaldehyde react with hydrogen under the action of aldehyde hydrogenation catalyst, so that 3-alkylacyloxy propyl alcohol and 2-alkylacyloxy propyl alcohol are produced, and the 3-alkylacyloxy propyl alcohol and the 2-alkylacyloxy propyl alcohol are hydrolyzed under the action of esterolytic catalyst, so that the 1,3-propylene glycol and the 1,2-propylene glycol are produced.

Description

technical field [0001] The present invention relates to the production method of chemical raw material, more specifically relate to the production method of propylene glycol. Background technique [0002] 1,3-propanediol is an important polyester fiber monomer, polytrimethylene terephthalate (PTT) obtained by polycondensation with terephthalic acid has a higher ) or polybutylene terephthalate (PBT) more superior performance. [0003] The preparation methods of 1,3-propanediol studied by the predecessors include ethylene oxide one-step method, ethylene oxide two-step method, acrolein hydration method, acetaldehyde-formaldehyde condensation method, acrylate method, biological method and so on. Among them, the ethylene oxide two-step process developed by Shell Company and the acrolein hydration process developed by Degussa Company have both achieved industrial production. [0004] Ethylene oxide two-step method: [0005] The ethylene oxide two-step process refers to the use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/09
Inventor 张明森柯丽赵清锐武洁花
Owner CHINA PETROLEUM & CHEM CORP
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