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Preparation method of gamma-butyrolactone

A technology for butyrolactone and polybutylene succinate, which is applied in the field of γ-butyrolactone preparation, can solve problems such as environmental pollution of polybutylene succinate, achieves low production cost and solves environmental problems , the effect of convenient operation

Active Publication Date: 2020-11-10
XIANTAO XIANSHENG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of γ-butyrolactone preparation method that utilizes waste polybutylene succinate one-step reaction to directly obtain γ-butyrolactone in view of the existing technical status, which not only solves the problem of polybutylene succinate To solve the environmental pollution problem of butanediol ester solid waste, the high-value chemical γ-butyrolactone was prepared to realize the high-value utilization of waste resources

Method used

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  • Preparation method of gamma-butyrolactone

Examples

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Effect test

Embodiment 1

[0029] A preparation method of gamma-butyrolactone, comprising the following steps:

[0030] S1. Take 5g of polybutylene succinate and 0.5g of palladium carbon catalyst in a 100ml high-temperature and high-pressure reactor, turn on the stirrer to stir, and control the stirring speed to 100-500RPM to make it mix evenly, and pass in hydrogen , remove the air in the high-temperature and high-pressure reactor, and then introduce 6MPa hydrogen, seal the high-temperature and high-pressure reactor, and then raise the temperature to 240°C at a heating rate of 6 degrees per minute, and react at 240°C for 12 hours;

[0031] S2. After the above reaction is completed, cool to room temperature, open the high-temperature and high-pressure reactor, collect samples, and obtain a crude liquid sample containing γ-butyrolactone by centrifugation;

[0032] S3. The crude liquid sample obtained in the previous step is rectified, and the fraction with a boiling point of about 204° C. is collected to...

Embodiment 2

[0035] A preparation method of gamma-butyrolactone, comprising the following steps:

[0036] S1. Take 5g of polybutylene succinate, 0.5g of palladium carbon catalyst and 40ml of tetrahydrofuran solvent in a 100ml high-temperature and high-pressure reaction kettle, turn on the stirrer to stir, and control the stirring speed to 100-500RPM to make it evenly mixed , feed hydrogen, remove the air in the high-temperature and high-pressure reactor, then feed 4MPa hydrogen, seal the high-temperature and high-pressure reactor, then raise the temperature to 200°C at a heating rate of 6 degrees per minute, and react at 200°C for 12 hours;

[0037] S2. After the above reaction is completed, cool to room temperature, open the high-temperature and high-pressure reactor, collect samples, and obtain a crude liquid sample containing γ-butyrolactone by centrifugation;

[0038] S3. The crude liquid sample obtained in the previous step is rectified, and the fraction with a boiling point of about ...

Embodiment 3

[0041] A preparation method of gamma-butyrolactone, comprising the following steps:

[0042] S1. Take 5g of polybutylene succinate and 0.5g of ruthenium carbon catalyst in a 100ml high-temperature and high-pressure reaction kettle, turn on the stirrer to stir, and control the stirring speed to 100-500RPM to make it evenly mixed, and pass in hydrogen , remove the air in the high-temperature and high-pressure reactor, and then introduce 4MPa hydrogen, seal the high-temperature and high-pressure reactor, then raise the temperature to 240°C at a heating rate of 6 degrees per minute, and react at 240°C for 12 hours;

[0043] S2. After the above reaction is completed, cool to room temperature, open the high-temperature and high-pressure reactor, collect samples, and obtain a crude liquid sample containing γ-butyrolactone by centrifugation;

[0044] S3. The crude liquid sample obtained in the previous step is rectified, and the fraction with a boiling point of about 204° C. is collecte...

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Abstract

The invention relates to the technical field of polyester material recycling, in particular to a gamma butyrolactone preparation method which comprises the following steps: S1, putting poly (butylenesuccinate) and a metal hydrogenation catalyst into a high-temperature and high-pressure reaction kettle, introducing hydrogen, removing air in the high-temperature and high-pressure reaction kettle, introducing 3-6MPa hydrogen, and reacting at 180-280 DEG C for 3-24 hours; or S1, putting poly (butylene succinate) and the metal hydrogenation catalyst into a high-temperature and high-pressure reaction kettle, adding a solvent, introducing hydrogen, removing air in the high-temperature and high-pressure reaction kettle, introducing 3-6MPa hydrogen, and reacting at 150-250 DEG C for 3-24 hours; s2, after the reaction is finished, cooling to room temperature to obtain a liquid crude sample containing gamma butyrolactone; and S3, rectifying the liquid crude sample, and collecting a fraction witha boiling point of about 204 DEG C to obtain gamma butyrolactone. The preparation method provided by the invention not only solves the problem of environmental pollution caused by solid waste of poly(butylene succinate), but also prepares the high-value chemical gamma-butyrolactone, so that high-value utilization of waste resources is realized.

Description

technical field [0001] The invention relates to the technical field of recycling polyester materials, in particular to a method for preparing gamma-butyrolactone. Background technique [0002] γ-Butyrolactone (GBL) is an important chemical intermediate in the fields of chemistry, medicine, fragrance and fine organic synthesis, and has a wide range of applications and economic value. For example, γ-butyrolactone can be used to synthesize vitamin B, ciprofloxacin, general anesthetic sodium γ-hydroxybutyrate, tranquilizer succinic acid, α-bromo γ-butyrolactone and other medical agents or pesticide intermediates. As a high boiling point solvent, γ-butyrolactone has strong solubility, good electrical properties and stability, and is safe to use. γ-butyrolactone, as a proton-type strong solvent, can dissolve most low-molecular polymers and some high-molecular polymers, and can be used as battery electrolyte instead of strong corrosive acid. γ-butyrolactone can be used as a carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/33
CPCC07D307/33Y02P20/584
Inventor 康世民张航张一德张佳翔黄慕榕
Owner XIANTAO XIANSHENG FINE CHEM