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Method for preparing lactic acid through catalyzing glycerol by nano copper

A technology for catalyzing glycerin and nano-copper, which is applied in the direction of oxidative preparation of carboxylic acid, carboxylate preparation, carboxylate preparation, etc., can solve the problems of high reaction temperature and reaction pressure, low reaction concentration of glycerin, and long reaction time. Achieve the effects of low reaction temperature and reaction pressure, good industrial prospects, and fast reaction rate

Inactive Publication Date: 2014-09-17
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004]Glycerin is a by-product in the biodiesel production process, and one ton of glycerol is produced for every ten tons of biodiesel produced; The output is also very large, using glycerin to produce a series of chemicals and chemical intermediates, which has the characteristics of regeneration and zero carbon dioxide emissions, and glycerin is rich in active hydroxyl groups, which are easy to replace and synthesize special chemicals. Development and utilization have great prospects; recent studies have found that the use of glycerol to prepare lactic acid not only develops new uses of glycerin, but also provides a sustainable source of raw materials for lactic acid; it can be known from literature reports that there are fermentation methods and chemical synthesis methods for the preparation of lactic acid from glycerol. Chemical synthesis methods include noble metal aerobic catalysis and high-temperature hydrothermal anaerobic oxidation; while fermentation and noble metal aerobic catalysis have the disadvantages of high cost, low glycerol reaction concentration and long reaction time; high-temperature hydrothermal anaerobic oxidation Higher requirements on reaction temperature and reaction pressure; Debdut Roy et al. used industrially produced Cu / SiO2, CuO / Al2O3 and Cu2O can effectively reduce the reaction temperature, but the reaction temperature, reaction time and lactic acid selectivity need to be improved

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  • Method for preparing lactic acid through catalyzing glycerol by nano copper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 4.58 g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 0.32 g nanometer copper (d 平均 =20 nm), add them together into a 400 mL autoclave, then weigh 9.20 g of glycerol (Sinopharm Chemical Reagent Co., Ltd.) with a 100 mL volumetric flask, add it to the autoclave, and ventilate it with nitrogen , and then airtight, heated to 220 ° C, timed, and reacted for 2 hours.

[0021] At the end of the reaction, take 20 mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2~3, measure the volume after acidification, transfer 1 mL with a pipette and dilute to 25 mL with deionized water, and perform high performance liquid chromatography detection. Measure the production of lactic acid; pipette 1 mL of the acidified sample and 20 μL of n-butanol for gas chromatography analysis; the analysis shows that the conversion rate of glycerol is 100% and the selectivity of lactic acid is 90%.

[0022] Reaction conditions: Glycerol concentration: 1...

Embodiment 2

[0024] Weigh 4.58 g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 0.32 g nanometer copper (d 平均 =100 nm), add them together into a 400 mL autoclave, then weigh 9.20 g of glycerol (Sinopharm Chemical Reagent Co., Ltd.) with a 100 mL volumetric flask to constant volume, add it to the autoclave, and ventilate it with nitrogen , and then airtight, heated to 230 ° C, timed, and reacted for 0.5 hours.

[0025] At the end of the reaction, take 20 mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2~3, measure the volume after acidification, transfer 1 mL with a pipette and dilute to 25 mL with deionized water, and perform high performance liquid chromatography detection. The production of lactic acid was measured; then 20 μL of 1 mL acidified sample was pipetted for gas chromatography analysis; the analysis showed that the conversion rate of glycerol was 93% and the selectivity of lactic acid was 88%.

[0026] Reaction conditions: Glycero...

Embodiment 3

[0028] Weigh 4.58 g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 0.32 g nanometer copper (d 平均 =150 nm), add them together into a 400 mL autoclave, weigh 9.20 g of glycerin (Sinopharm Chemical Reagent Co., Ltd.) with a 100 mL volumetric flask, add it to the autoclave, and ventilate it with nitrogen , and then airtight, heated to 220 ° C, timed, and reacted for 2 hours.

[0029] At the end of the reaction, take 20 mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2~3, measure the volume after acidification, transfer 1 mL with a pipette and dilute to 25 mL with deionized water, and perform high performance liquid chromatography detection. The production of lactic acid was measured; then 20 μL of 1 mL acidified sample was pipetted and analyzed by gas chromatography; the analysis showed that the conversion rate of glycerol was 83%, and the selectivity of lactic acid was 82%.

[0030] Reaction conditions: Glycerol concentration: 1.0 M...

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Abstract

The invention relates to the technical field of lactic acid preparation and particularly relates to a method for preparing lactic acid through catalyzing glycerol by nano copper. According to the method provided by the invention, reaction is carried out on glycerol which serves as a raw material for 0.5-4 hours in a high-pressure reactor at the temperature of 150-230 DEG C under anaerobic alkaline conditions in the presence of nano copper, thereby obtaining lactic acid. The method has the advantages that the reaction temperature and reaction pressure are low, the catalyst activity is high, the selectivity is good, the reaction rate is high, the process flow is safe and environmental-friendly, and the like, so that the industrial prospect is good.

Description

technical field [0001] The invention relates to the technical field of lactic acid preparation, in particular to a method for preparing lactic acid from glycerin catalyzed by nanometer copper. Background technique [0002] Lactic acid, the chemical system is named 2-hydroxypropanoic acid (2-Hydroxypropanoic acid). Since the carbon atom at the alpha position of the carboxyl group in the lactic acid molecule is an asymmetric carbon atom, lactic acid has two kinds of optical activity: left-handed (L-type) and The dextrorotatory (D-type) enantiomer; lactic acid was first discovered in yoghurt by Scheele in 1850, hence the name of lactic acid; lactic acid is one of the three recognized organic acids in the world, widely present in the human body, animals and The metabolism of microorganisms also exists in all aspects of people's lives. [0003] Lactic acid is an organic acid with a wide range of uses, mainly used in the food and pharmaceutical industries; the use of lactic acid ...

Claims

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Application Information

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IPC IPC(8): C07C51/02C07C51/16C07C59/08
CPCC07C51/02C07C51/16C07C51/41C07C59/08
Inventor 张长华尹海旭殷恒波沈灵沁冯永海王爱丽陆秀凤鲁华胜
Owner JIANGSU UNIV
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