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Method for preparing dibasic alcohol

A technology of dihydric alcohol and polyethylene glycol, which is applied in the preparation of organic compounds, chemical instruments and methods, and the preparation of oxygen-containing compounds, etc., can solve the problems of increased production costs, reduce production costs, avoid hydrolysis catalyst recovery and The effect of attrition problems

Inactive Publication Date: 2008-07-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the hydrolysis process in the above-mentioned method has all adopted catalyst, therefore can involve the recovery of catalyst and loss problem, thereby causes the production cost of ethylene (propylene) glycol to increase

Method used

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  • Method for preparing dibasic alcohol
  • Method for preparing dibasic alcohol
  • Method for preparing dibasic alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] CO control 2 The mol ratio of / propylene oxide is 1.1, enters synthesis reactor, the amount of catalyzer tetraethylamine bromide is 1.0% of propylene oxide weight, 180 ℃ of reaction temperatures, 1 hour reaction time, the purity 99.5% of propylene carbonate, Yield 99.5% (calculated as propylene oxide)

[0039] Adjust the molar ratio of water / propylene carbonate to 2, enter the hydrolysis reactor, the pressure is 0.3MPa, the reaction temperature is maintained at 80°C, and the reaction is 0.5 hour, the conversion rate of propylene carbonate is 99.5%, and the selectivity of propylene glycol is 100%.

[0040] The rectification tower is a packed tower with 20 theoretical plates, a reflux ratio of 3.0, a tower inner pressure of 0.018Mpa, a tower bottom temperature of 160°C, a purity of propylene glycol above 99.5%, and a rectification yield of 97%. The total yield of propylene glycol is 96.0% (calculated as propylene oxide).

Embodiment 2

[0042] CO control 2 The molar ratio of / ethylene oxide is 1.05, enters synthesis reactor, the amount of catalyst KI / PEG is 1.0% of propylene oxide weight, 150 ℃ of reaction temperatures, 1 hour reaction time, the purity 99.5% of ethylene carbonate, yield Rate 99.5% (based on propylene oxide)

[0043] Adjust the molar ratio of water / ethylene carbonate to 1.5, enter the hydrolysis reactor, the pressure is 7.0MPa, the reaction temperature is maintained at 240 ° C, and the reaction is 4.0 hours. The conversion of ethylene carbonate is 100%, and the selectivity of ethylene glycol is 100%.

[0044] The rectification tower is a tray tower with 30 theoretical plates, reflux ratio of 2.5, tower inner pressure of 0.018Mpa, tower bottom temperature of 165°C, ethylene glycol purity of over 99.5%, and rectification yield of 98%. The total yield of ethylene glycol is 97.5% (calculated as ethylene oxide).

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Abstract

This invention relates to diatomic alcohol displayed as formula (1) preparation method. The procedures are that materials are ethylene (propylene) oxide and carbon dioxide, then they react to make ethylene carbonate (carbonic allyl ester) with condition of catalyst. Ethylene (propylene) glycol and carbon dioxide are generated by carbonate (carbonic allyl ester) and water under condition of pressuring and no catalyst, the carbon dioxide is recovered and back to the reactor for cycling using, 99.5 percent purity ethylene (propylene) glycol is got after hydrolysate is decompressed and rectified, its recovery can be more than 95 percent. The biggest advantage is that there is no catalyst in the hydrolysis of ethylene (propylene) oxide, so the problem of hydrolysis catalyst recovery and consumption in existing technique is avoided; ethylene (propylene) glycol preparation cost is reduced.

Description

technical field [0001] The present invention relates to a kind of preparation method of dibasic alcohol, specifically, relate to a kind of C 2 ~C 3 Method for the preparation of dihydric alcohols. Background technique [0002] C 2 ~C 3 Dihydric alcohols, whose typical representatives are ethylene glycol and 1,2-propanediol (hereinafter referred to as propylene glycol), are important chemical raw materials. [0003] At present, the large-scale production of ethylene (propylene) glycol in all countries in the world adopts the process of direct pressurized hydration of ethylene oxide (propylene) alkane. The following two reactions mainly occur in the reaction process: [0004] Main reaction: EO (or PO) + H 2 O→EG (or PG) [0005] Side reaction: EO (or PO) + EG (or PG) → DEG (or DPG) [0006] EO (or PO) + DEG (or DPG) → TEG (or TPG) [0007] Among them: EO means ethylene oxide, PO means propylene oxide, EG means ethylene glycol, PG means propylene glycol, DEG means ethyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C27/02C07C31/20
Inventor 方云进李殷
Owner EAST CHINA UNIV OF SCI & TECH
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