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Preparation method of polymerized 3-hydroxybutyric acid

A technology of hydroxybutyric acid and polymer, which is applied in the field of polymerizing 3-hydroxybutyric acid preparation, can solve the problems of harsh conditions, serious pollution, unfavorable industrial production, etc., and achieve the effect of increased yield and simple synthesis method

Pending Publication Date: 2021-06-25
SHANGHAI SHINE HIGH INT TRADE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since the current synthesis method is mainly microbial fermentation, the existing microbial fermentation has limited production capacity, serious pollution, harsh conditions, and is not conducive to large-scale industrial production.

Method used

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  • Preparation method of polymerized 3-hydroxybutyric acid
  • Preparation method of polymerized 3-hydroxybutyric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the hydrogenation reaction pot, add 84.07 grams of diketene, 160 ml of dichloroethane, replace with nitrogen 3 times, then raise the temperature to 50°C while feeding hydrogen, keep the pressure at 2.0MPa, and react under the conditions until the hydrogen is no longer consumed , terminated the reaction and lowered the temperature, and evaporated ethanol to obtain 81.8 grams of β-butyrolactone.

[0019] Add 81.8 grams of β-butyrolactone, 475 grams of water, 0.4 grams of biological enzyme catalyst, and 0.4 grams of magnesium octanoate in the flask, then raise the temperature to 120°C for reaction, take samples to detect the products in the reaction system, stop the reaction after passing the test, cool down and filter to obtain 77.8 grams of 3-hydroxybutyric acid was polymerized, and 472 grams of filtrate obtained by filtration was also applied to the next batch of polymerization in step (2). The total yield of the two steps was 92.5%.

Embodiment 2

[0021] In the hydrogenation reaction pot, add 84.07 grams of diketene and 250 milliliters of dichloroethane, use nitrogen to replace 3 times, then cool down to -10°C while feeding hydrogen, keep the pressure at 0.1MPa, and react under the conditions until it is no longer consumed Hydrogen, stop the reaction and lower the temperature, evaporate ethanol to obtain 80 grams of β-butyrolactone.

[0022] Add 80 grams of β-butyrolactone in the flask, add 472 grams of filtrate water in Example 1, add 5 grams of fresh water, add 0.5 grams of biological enzyme catalyst, 0.3 grams of magnesium octanoate, then heat up to 50 ° C for reaction, and take samples for detection The product in the reaction system was qualified and the reaction was terminated, and the temperature was lowered and filtered to obtain 78.2 grams of polymerized 3-hydroxybutyric acid, and the total yield of the two steps was 93.01%.

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Abstract

The invention provides a preparation method of polymerized 3-hydroxybutyric acid, and the method is characterized in that the method comprises the following steps: S1, preparation of beta-butyrolactone: adding a diketene solvent into a hydrogenation reactor, carrying out hydrogenation under certain conditions under the action of a metal rhodium catalyst or an iridium metal catalyst to obtain beta-butyrolactone, performing filtering, and carrying out reduced pressure distillation to remove the solven. The synthesis method is simple, the yield is remarkably improved, the method can be used for industrial production, a hydrogenation and polymerization clean and green chemical synthesis method is adopted, reaction water can be repeatedly used, and the method is close to zero wastewater discharge.

Description

technical field [0001] The invention relates to the field of degradable materials, in particular to a method for preparing polymerized 3-hydroxybutyric acid. Background technique [0002] Polymerized 3-hydroxybutyric acid, referred to as PHB, is a new type of thermoplastic that can be completely degraded by microorganisms. It is very friendly to the environment and can solve the problem of white pollution from the source. It has biodegradability, biocompatibility, optical activity, compression Its performance is equivalent to that of polypropylene and polystyrene at room temperature. In addition, it has similar mechanical properties at room temperature to PP, similar melting problems, lower solvent resistance, and better UV aging resistance. . [0003] However, since the current synthesis method is mainly microbial fermentation, the existing microbial fermentation has limited production capacity, serious pollution, harsh conditions, and is not conducive to large-scale indus...

Claims

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Application Information

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IPC IPC(8): C12P7/62
CPCC12P7/625
Inventor 呼延旺
Owner SHANGHAI SHINE HIGH INT TRADE CO LTD
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