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Method for preparing n-butyric acid from poly 3-hydroxybutyrate

A technology of hydroxybutyrate and n-butyric acid, applied in the preparation of carboxylate/lactone, preparation of carboxylate, chemical instruments and methods, etc., can solve the problems of high separation cost, environmental hazards, low yield and the like

Inactive Publication Date: 2019-01-25
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and deficiencies of high separation cost, low yield and harm to the environment in the production method of n-butyric acid in the prior art, and to provide a method for preparing n-butyric acid by using poly 3-hydroxybutyrate

Method used

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  • Method for preparing n-butyric acid from poly 3-hydroxybutyrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing n-butyric acid with poly-3-hydroxybutyrate, said method is as follows:

[0023] Put 5 g of poly-3-hydroxybutyrate in a 300 mL high-temperature and high-pressure reactor, pass through hydrogen to remove the air in the reactor, and keep the pressure of hydrogen at 4 MPa, and keep the reactor secret. Turn on the mechanical stirring, control the mechanical stirring speed to 1000 rpm, raise the temperature to 200 °C at 4 °C / min, and react at 200 °C for 24 h. After the reaction, cool down and put it at room temperature, poly 3-hydroxybutyrate is completely converted, and obtain a liquid product based on n-butyric acid (see figure 1 ). The yield of n-butyric acid detected by gas chromatography quantitative analysis is 97%, and the purity of n-butyric acid in the liquid product is 98%.

Embodiment 2

[0025] A method for preparing n-butyric acid with poly-3-hydroxybutyrate, said method is as follows:

[0026] Put 5 g of poly-3-hydroxybutyrate in a 300 mL high-temperature and high-pressure reactor, pass through hydrogen to remove the air in the reactor, and keep the pressure of hydrogen at 5 MPa, and keep the reactor secret. Turn on the mechanical stirring, control the mechanical stirring speed to 800 rpm, raise the temperature to 210 °C at 4 °C / min, and react at a temperature of 210 °C for 18 h. After the reaction, the temperature was lowered and cooled to room temperature, the poly-3-hydroxybutyrate was completely converted, and a liquid product mainly composed of n-butyric acid was obtained. The yield of n-butyric acid detected by gas chromatography quantitative analysis was 95%, and the purity of n-butyric acid in the liquid product was 97%.

Embodiment 3

[0028] A method for preparing n-butyric acid with poly-3-hydroxybutyrate, said method is as follows:

[0029] Put 5 g of poly-3-hydroxybutyrate in a 300 mL high-temperature and high-pressure reactor, pass through hydrogen to remove the air in the reactor, and keep the pressure of hydrogen at 3 MPa, and keep the reactor secret. Turn on the mechanical stirring, control the mechanical stirring speed to 800 rpm, raise the temperature to 220 °C at 4 °C / min, and react at 220 °C for 12 h. After the reaction, the temperature was lowered and cooled to room temperature to obtain a liquid product mainly composed of n-butyric acid.

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Abstract

The invention relates to a method for preparing n-butyric acid from poly 3-hydroxybutyrate. The method comprises the following steps that poly 3-hydroxybutyrate is put into a sealed device; hydrogen gas is introduced for eliminating air; after the pressure of initial hydrogen gas is 2 to 6 MPa, stirring reaction is performed for 6 to 36h at 190 to 240 DEG C; the n-butyric acid is obtained. The preparation method provided by the invention has the advantages that catalysts and reaction catalysts are not needed; under the hydrogen gas atmosphere condition, the poly 3-hydroxybutyrate is convertedinto the n-butyric acid through one-step reaction; the conversion rate of the 3-hydroxybutyrate is 100 percent; the yield of the n-butyric acid reaches up to 97 percent; the purity of the n-butyric acid in the obtained liquid product reaches up to 98 percent; the additional continuous separation process of the obtained n-butyric acid product is not needed.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of poly-3-hydroxybutyrate, and in particular relates to a method for preparing n-butyric acid by utilizing poly-3-hydroxybutyrate. Background technique [0002] The development of renewable biomass feedstocks to replace depleted petrochemical resources for the production of chemicals has attracted widespread attention. Poly 3-hydroxybutyrate is a kind of intracellular polyester synthesized by many microorganisms, and it mainly exists as a storage material of carbon source and energy in microorganisms. Poly(3-hydroxybutyrate) can be produced industrially on a large scale through microbial fermentation, and has become an important renewable biomass resource. [0003] N-butyric acid is an important organic chemical, such as being widely used in the synthesis of perfumes, as a raw material for fine chemical products in the synthesis of butyrates and cellulose butyrates. The existing industri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/124C07C51/09
CPCC07C51/09C07C53/124C08G63/06C07C51/377
Inventor 康世民张航李杰泰李志林徐勇军孙成华洪南龙
Owner DONGGUAN UNIV OF TECH
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