Method for preparing bio-based nylon polybutyrolactam

A polybutyrolactam, bio-based nylon technology, applied in the directions of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the limitation of the application of PA4, the high cost of PA4, and the high cost of butyrolactam production. and other problems to achieve the effect of reducing production costs

Active Publication Date: 2011-02-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods must use non-renewable resources as raw materials to produce butyrolactam through high temperature and high pressure reaction, which makes the production cost of butyrolactam high, resulting in high cost of PA4, which greatly limits the application of PA4

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] All percentages in this embodiment are mass percentages (w / w) if not otherwise specified

[0023] (1) Fermentation of glutamic acid, strain: Corynebacterium glutamicum

[0024] Seed medium: glucose 2.5%, corn steep liquor 3.0%, urea 0.8%, KH 2 PO 4 0.1%, MgSO 4 0.05%, pH 7.0, temperature 35°C, culture until OD ≥ 1.0, pH around 7.2, residual sugar ≤ 0.8%, fermentation medium: glucose 8.0%, corn steep liquor 0.2%, urea 0.1%, KH 2 PO 4 0.2%, MgSO 4 0.05%, antifoaming agent 0.05%, pH7.0, supplement sugar during the fermentation process, use liquid ammonia to adjust the pH, and control the pH at 7.0.

[0025] During the fermentation process, take 500mL of mature seeds and insert them into a 5L fermenter with 2.0L fermentation medium, control the stirring speed to 600rpm, the air volume to 0.8vvm, and cultivate at 35°C for 6 hours. If the dissolved oxygen is lower than 10% during the process, increase The air volume keeps the dissolved oxygen ≥ 10%. After 6 hours, the c...

Embodiment 2

[0037] Different carbon sources were used to carry out glutamic acid fermentation shake flask experiments, which proved that different carbon sources produced glutamic acid.

[0038] Strain: Corynebacterium glutamicum, seed medium: glucose 2.5%, corn steep liquor 3.0%, urea 0.8%, KH 2 PO 4 0.1%, MgSO 4 0.05%, pH 7.0, temperature 35°C, culture until OD ≥ 1.0, pH around 7.2, residual sugar ≤ 0.8%, can be replanted, fermentation shake flask medium: carbon source 6.0%, corn steep liquor 0.2%, urea 0.1 %, KH 2 PO 4 0.2%, MgSO 4 0.05%, CaCO 3 1.0%, pH7.0. During the fermentation process, 10 mL of mature seeds were taken and inserted into a 500 mL shaker flask containing 40 mL of fermentation medium, cultured at 200 rpm, 35°C for 36 hours, and the content of glutamic acid was measured. The results are shown in Table 1.

[0039] Table 1

[0040] carbon source

Embodiment 3

[0042] Get the Sodium Glutamate 600g that buys on the market, be mixed with 6% Sodium Glutamate solution, step 2 obtains 200mL centrifugation of fermented liquid, collect thalline, add thalline in 6% Sodium Glutamate solution, Transform at 35°C for 2 hours, until no bubbles are released and the reaction reaches the end, and L-sodium glutamate is converted into γ-aminobutyric acid.

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Abstract

The invention relates to a method for preparing bio-based nylon polybutyrolactam. The method comprises the following steps of: fermenting and converting a biomass material to obtain glutamic acid, enzymatically converting by using glutamic acid decarboxylase and extracting and purifying to obtain a gamma-aminobutyric acid, and performing high-pressure polymerization to prepare the bio-based nylonpolybutyrolactam. Compared with the prior art, the method does not require ring-opening polymerization when butyrolactam is taken as a raw material, so that the problem of raw material supply in the mass production of Polyamide (PA) 4 is solved; and the method replaces the chemical high-temperature and high-pressure process by utilizing a biological conversion process, so that the production costis greatly reduced, and the large-scale application of the PA4 becomes possible.

Description

technical field [0001] The invention relates to a polymer production process, in particular to a preparation method of bio-based nylon polybutyrolactam. Background technique [0002] PA4, also known as polybutyrolactan (polybutyrolactan), polyamide 4 (polyamide 4), is a translucent or milky white thermoplastic resin, relative density d = 1.22 ~ 1.24, melting point 260 ~ 265 ° C. Soluble in zinc chloride or other inorganic salt solutions at room temperature, also soluble in superheated water, at 0.1mol / dm 3 (0.1mol / L) sodium hydroxide and hydrochloric acid hydrolyze at 100°C, have better thermal stability than other nylons, and have the highest hydrophilicity among nylon resins. Mainly used for synthetic fiber, artificial leather, synthetic paper, etc. The artificial leather made of PA4 is elastic, porous, and has no static electricity. It can also be processed into plastic products by injection molding and extrusion molding. [0003] Because nylon 4 has a hydrophilicity v...

Claims

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Application Information

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IPC IPC(8): C12R1/13C12P13/00C08G69/08C12R1/15C12P13/14
Inventor 赵黎明刘旭勤纪念夏泉鸣
Owner EAST CHINA UNIV OF SCI & TECH
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