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Purification method of crude glycerine obtained from kitchen waste and application thereof

A purification method, a technology for kitchen waste, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, organic chemistry, etc., can solve problems such as limiting the speed at which the film can be processed, sticking to the roller, and the film cannot be collected. , to maximize resource utilization and prevent waste

Inactive Publication Date: 2018-09-04
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cast film extrusion and blown film extrusion are two common methods of film production. In cast film extrusion, the film is cooled on chilled rolls immediately after leaving the film die. Molten PHA often sticks to the rolls. , limiting the speed at which the film can be processed, or even preventing the film from being collected

Method used

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  • Purification method of crude glycerine obtained from kitchen waste and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, the pretreatment of purified crude glycerol for PHA fermentation is demonstrated. Methanol was first removed from crude glycerol by evaporation under vacuum at 50-90°C over 2 hours. The crude glycerol is then acidified to the desired pH level (pH 5-6) with an acid (such as sulfuric acid, hydrochloric acid and / or phosphoric acid at a mass concentration of 5-6%) and held for a time long enough to allow the formation of three separate The layers: the upper layer is the fatty acid phase, the middle layer is the glycerol-rich phase, and the bottom layer is the inorganic salt phase and other aqueous residues. The bottom phase was separated by simple decantation. The fatty acid-rich upper phase was separated from the glycerol-rich phase by using a separating funnel. The extracted glycerol was neutralized with 12M KOH solution, and then evaporated to remove water at 110° C. for 2 hours, and then filtered with activated carbon to remove the solid residue, and ...

Embodiment 2

[0021] In this example, the fermentation and extraction of PHA using the purified glycerol in Example 1 is demonstrated.

[0022] The yield of PHA production varied with different nitrogen and phosphorus concentrations. Therefore, nitrogen concentrations (50 mM and 70 mM NH 4+ ) and phosphorus concentration (7 mM, 70 mM and 100 mM PO 4 3- ) on the production of PHA. Different concentrations of NH 4+ and PO 4 3- Add glycerol (32 g / L) to the Erlenmeyer flask, and then incubate aerobically at 100 rpm at 35°C in a shaking incubator.

[0023] After 28 h and 96 h of fermentation, the bacterial cells were collected by centrifugation and then freeze-dried for the subsequent PHA extraction process. The hypochlorite method has been found to be a simple and quick method of extracting PHA. The hypochlorite dissolves the non-PHA cellular material while precipitating insoluble polymers in solution. PHA was extracted with hypochlorite in 2% (w / v) active chlorine, and the remaining l...

Embodiment 3

[0025] In this example, PHA formulations for film production by cast film extrusion and / or blown film extrusion are shown. The key to film formation is to increase the crystallization rate of PHA. The solution in this example is to add a nucleating agent to the formula to accelerate crystallization.

[0026] Conventional nucleating agents include, for example, talc, micronized mica, calcium carbonate, boron nitride, ammonium chloride, and the like. In addition to those, carboxylates of metals of Groups I and II of the periodic table can also be used as nucleating agents. Examples of carboxylic acids are acetic, propionic, caproic, palmitic, stearic, oleic, behenic, montanic, etc.; while group I and II metals include sodium, potassium, lithium, magnesium, calcium, barium, and zinc. The addition amount may be in the range of 0.5 wt% to 5 wt%.

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PUM

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Abstract

The invention discloses a purification method of crude glycerine obtained from kitchen waste and application thereof, and relates to the purification of crude glycerine obtained from kitchen waste andvarious applications of the purified crude glycerine. In order to solve the conventional problem, the first purpose of the invention is to provide the purification method of the crude glycerine obtained from kitchen waste, the second purpose of the invention is to provide a method for producing poly-hydroxyalkanoates through microbial fermentation, the third purpose of the invention is to providea method for accelerating crystallization in a PHA membrane preparation process, and the fourth purpose of the invention is to provide a PHA membrane preparation method. The method has the beneficialeffects that the kitchen waste can be utilized to the maximum extent to prevent waste, and the maximization of resource utilization is realized.

Description

technical field [0001] The present invention relates to purifying crude glycerol obtained from kitchen waste and various uses of the purified crude glycerin. Background technique [0002] Today, cooking oil is usually recovered and converted into biodiesel for use as fuel, and currently 10 wt% of the glycerol used in biodiesel production is provided by waste glycerol. Although glycerol has been widely used in the cosmetic, food, and pharmaceutical industries, it is expensive to purify waste glycerol to high purity for commercial applications, so landfill disposal is usually the fate of waste glycerol. [0003] Bacterial fermentation may be an economically viable route to utilize low-value waste glycerol and produce high-value-added biological products such as biodegradable plastics. Biodegradable plastics can come from renewable biomass sources. Polyhydroxyalkanoates (PHAs) are linear polyesters produced in nature by bacterial fermentation of sugars or lipids and are accum...

Claims

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Application Information

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IPC IPC(8): C07C29/74C07C29/76C07C29/86C07C31/22C12P7/62
CPCC07C29/74C07C29/76C07C29/86C12P7/625C07C31/225
Inventor 刘若天冼穗娴逯丽严郭庄其
Owner NANO & ADVANCED MATERIALS INST
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