Method for preparing polylactic acid by using agricultural and sideline products

A technology of agricultural by-products and polylactic acid, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of incapable of industrial production, unsuitable for industrial production, not fully mature, etc., and achieve the effect of low cost

Inactive Publication Date: 2015-05-06
CHONGQING HENGYUAN JINTONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology makes use of crop residue from Northwestern regions where crops were used during cultivations instead of disposing them properly after harvesting. It involves preparing an agar-based liquid with specific ingredients added at different stages throughout its life cycle. These liquids can be stored until needed without losing their original quality when they're ready to be utilized by others. By adding these components together, this technique allows us to create a highly effective solution for producing high levels of lactate esters (lactic acid) while reducing costs associated with traditional methods such as incinerating it away.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency and quality of producing lactic esters from starch sources like corn grains. Current processes involve multiple stages involving different chemical reactions, leading to impurities during purifying these compounds. There have been attempts to develop new techniques without contaminating any unwanted substances found naturally occurring on plants grown throughout worldwide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Utilizes the method for fermenting lactic acid with straw

[0024] a seed medium

[0025] The formula of seed medium is: glucose 60g / L, peptone 10g / L, beef extract 6g / L, yeast powder 10g / L, sodium chloride 0.03g / L, ferrous sulfate 0.01g / L, sodium acetate 4g / L, Diamine citrate 2g / L, potassium dihydrogen phosphate 2g / L, Tween-801mL / L, magnesium sulfate 0.2g / L, manganese sulfate 0.2g / L. The strain Rhizopus oryzae was inserted into a 500mL Erlenmeyer flask containing 125mL of seed medium, shaken at 37°C for 12 hours, and the shaker rotated at 100 rpm.

[0026] 2. Straw pretreatment

[0027] Dry the straw stalks and cut them into 3-8cm straw strips. The straw is pulverized into a coarse powder with a straw crusher, and the coarse powder is ground again to a particle size of 80 meshes. Place it under high-pressure steam at 121°C for 60 minutes, and let it cool at room temperature. Soak in the PBS solution overnight to obtain the pretreatment material; the pr...

Embodiment 2

[0033] Embodiment 2 utilizes the method for fermenting lactic acid of corn stalk

[0034] a seed medium

[0035] The formula of seed medium is: glucose 60g / L, peptone 10g / L, beef extract 6g / L, yeast powder 10g / L, sodium chloride 0.03g / L, ferrous sulfate 0.01g / L, sodium acetate 4g / L, Diamine citrate 2g / L, potassium dihydrogen phosphate 2g / L, Tween-801mL / L, magnesium sulfate 0.2g / L, manganese sulfate 0.2g / L. The strain Rhizopus oryzae was inserted into a 500mL Erlenmeyer flask containing 125mL of seed medium, shaken at 37°C for 12 hours, and the shaker rotated at 100 rpm.

[0036] 2. Pretreatment of corn stalks

[0037] Dry the corn stalks and cut them into 5cm strips. The corn stalks were pulverized into coarse powder with a straw grinder, and the coarse powder was ground again to a particle size of 80 mesh. Place it under high-pressure steam at 121°C for 60 minutes, and let it cool at room temperature. Soak in the PBS solution overnight to obtain the pretreatment material...

Embodiment 3

[0043] The synthesis of embodiment 3 polylactic acid

[0044] The synthesis method of polylactic acid is the prior art, and the present invention is realized by citing one of them. Specifically: after directly mixing the lactic acid raw material, zinc salt, diacid or dianhydride in a weight ratio of 1:0.02:0.8:0.04:0.04, melt polycondensation at a temperature of 180°C and a pressure of 10KPa for 55 hours, and then The reaction product was successively dissolved in acetone, washed with methanol precipitation, washed with distilled water, and dried to obtain polylactic acid in the form of white powder.

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Abstract

The invention belongs to the fields of biological fermentation and chemistry, particularly relates to a lactic acid and polylactic acid preparation technology, and concretely relates to a method for preparing polylactic acid by using agricultural and sideline products. The agricultural and sideline products are cornstalks and/or straws. The method concretely includes the steps of pretreatment of the agricultural and sideline products, enzymatic hydrolysis pretreatment, lactic acid fermentation and polylactic acid preparation. A fermentation medium is prepared from agricultural product wastes cornstalks and straws in Southwest in China, Rhizopus oryzae is inoculated to the fermentation medium, and a stable fermentation technology is obtained through optimizing in order to obtain high yield of lactic acid. The method is inexpensive, changes wastes into valuables, and is suitable for industrial production.

Description

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Claims

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Application Information

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Owner CHONGQING HENGYUAN JINTONG TECH
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