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Method for catalyzing high-concentration glycerol to prepare lactic acid by bimetallic Cu-Pd catalyst

A catalyst and bimetallic technology, which is applied in the field of bimetallic Cu-Pd alloy catalyst to catalyze the conversion of high-concentration glycerin to prepare lactic acid, can solve the problems of lactic acid selectivity and low conversion rate of glycerin, mild reaction conditions, long reaction time, etc. Simple, safe and environmentally friendly, low reaction temperature and fast reaction rate

Inactive Publication Date: 2016-12-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a by-product of biodiesel production, glycerin has a very large output, accounting for about 10%-20% of the total biodiesel. According to relevant literature, the annual production of glycerin from biodiesel is about 2500kt, which shows that glycerin is very surplus in the market. According to its huge The availability of glycerol, and the three active hydroxyl groups in the molecule, are easy to replace and convert to produce a series of chemicals and chemical intermediates, with the characteristics of regeneration and zero carbon dioxide emissions, so the development and utilization of glycerol has great prospects; in recent years, research has found , lactic acid is an important chemical compound synthesized from glycerol, which not only opens up a new way for the development and utilization of glycerol, but also provides a sustainable raw material source for lactic acid; it is reported in the literature that there are fermentation methods and chemical methods for the preparation of lactic acid from glycerol. Synthesis method, chemical synthesis method has precious metal aerobic catalysis method and high temperature hydrothermal anaerobic oxidation method, while fermentation method and noble metal aerobic catalysis method have disadvantages such as high cost, low glycerin concentration, long reaction time and low selectivity
[0004] Patent CN104045543A discloses a method for preparing lactic acid from glycerin catalyzed by nano-copper. Glycerin is used as raw material, the reaction temperature is 150-230°C, and the reaction time is 0.5-4h. Lactic acid is prepared in medium, and the conversion rate of glycerin can be 70-100%, and the selectivity of lactic acid is 67-90%. The reaction conditions of this technology are mild, but the concentration of glycerol is low.

Method used

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  • Method for catalyzing high-concentration glycerol to prepare lactic acid by bimetallic Cu-Pd catalyst
  • Method for catalyzing high-concentration glycerol to prepare lactic acid by bimetallic Cu-Pd catalyst
  • Method for catalyzing high-concentration glycerol to prepare lactic acid by bimetallic Cu-Pd catalyst

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Experimental program
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Embodiment 1

[0020] Copper-palladium alloy catalyst (CuPd 2 ) preparation: weigh 1.826g Cu(NO 3 ) 2 ·3H 2 O and 0.040g Pd(NO 3 ) 2 2H 2 0, to ensure that the total mass of the catalyst copper-palladium alloy is 0.5g. First the Cu(NO 3 ) 2 ·3H 2 O was added to 30 mL of 15% polyethylene glycol-6000 absolute ethanol solution with a mass concentration of 15%, sonicated for 30 min to completely dissolve it, and then the solution was poured into a round-bottomed flask equipped with a stirrer, and preheated in a water bath at 55 °C For 15 minutes, adjust the pH value of the solution to 9-10 with a saturated NaOH solution in absolute ethanol, and then add a solution of hydrazine hydrate in absolute ethanol mixed with 8 mL of hydrazine hydrate and 80 mL of absolute ethanol dropwise into the round bottom flask for reaction. solution, reacted in a water bath for 2.5h, then lowered the temperature of the water bath to 30°C and added 20mL of Pd(NO 3 ) 2 2H 2 The aqueous solution of O was re...

Embodiment 2

[0029] Copper palladium alloy catalyst (CuPd 3 ) preparation: preparation conditions and steps are the same as those of CuPd in ​​Example 1 2 Catalyst preparation method is the same, 1.826g Cu(NO 3 ) 2 ·3H 2 O and 0.04g Pd(NO 3 ) 2 2H 2 O was changed to 1.798g Cu(NO 3 ) 2 ·3H 2 O and 0.059g Pd(NO 3 ) 2 2H 2 O.

[0030] Weigh 64.4g of glycerin (Sinopharm Chemical Reagent Co., Ltd.), use a 100mL volumetric flask to make a constant volume, add it to a 300mL autoclave, and then weigh 30.8g of sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 2.58g of CuPd 3 , together into the autoclave, evacuate with high-purity nitrogen, then seal the autoclave, stir at 300 rpm, heat the autoclave to 160°C and start timing, and react for 2 hours.

[0031] After the reaction, use a pipette to pipette 1 mL of the reaction solution and add 20 μL of isopropanol for gas chromatography analysis; also take 20 mL of the reaction solution and acidify it with hydrochloric acid until...

Embodiment 3

[0039] Copper palladium alloy catalyst (CuPd 4 ) preparation: preparation conditions and steps are the same as CuPd in ​​Example 1 2 Catalyst preparation method is the same, 1.826g Cu(NO 3 ) 2 ·3H 2 O and 0.04gPd(NO 3 ) 2 2H 2 O was changed to 1.770g Cu(NO 3 ) 2 ·3H 2 O and 0.078g Pd(NO 3 ) 2 2H 2 O.

[0040] Weigh 64.4g glycerol (Sinopharm Chemical Reagent Co., Ltd.), use a 100mL volumetric flask to make a constant volume, add it to a 300mL autoclave, then weigh 30.8g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 2.58g CuPd 4 , together into the autoclave, evacuate with high-purity nitrogen, then seal the autoclave, stir at 300 rpm, heat the autoclave to 160°C and start timing, and react for 2 hours.

[0041] After the reaction, use a pipette to pipette 1 mL of the reaction solution and add 20 μL of isopropanol for gas chromatography analysis; also take 20 mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2.5, calcula...

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Abstract

The invention relates to the technical field of lactic acid preparation, and in particular, relates to a method for catalyzing and converting high-concentration glycerol to prepare lactic acid by a bimetallic Cu-Pd alloy catalyst. The method provided by the invention comprises that biomass glycerol is used as a raw material, the reaction temperature is 100-180 DEG C, the reaction time is 1-2 h, in the presence of the bimetallic Cu-Pd alloy catalyst, in an anaerobic environment with the alkalinity provided by NaOH, and in an anaerobic high-pressure reaction kettle vented with high-purity nitrogen, a reaction is performed to obtain lactic acid.

Description

technical field [0001] The invention relates to the technical field of lactic acid preparation, in particular to a method for preparing lactic acid by catalytically converting high-concentration glycerin with a bimetallic Cu-Pd alloy catalyst. Background technique [0002] Lactic acid is one of the three major organic acids. It is an important biochemical product, mainly used in industries such as food and medicine. Since lactic acid has no side effects on the human body and is easily absorbed, it can directly participate in internal metabolism, promote digestion and Inhibit the harmful bacteria in the intestinal tract, etc., so it is widely used. Lactic acid and its derivatives are recognized as safe food additives. For example, the use of lactic acid with a mass fraction of 80% in the brewing industry can prevent the growth of miscellaneous bacteria, promote the development of yeast, prevent the turbidity of wine and enhance the flavor of wine. In the food industry, lacti...

Claims

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Application Information

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IPC IPC(8): C07C59/08C07C51/295B01J23/89B22F9/24
CPCC07C51/295B01J23/8926B22F9/24B01J35/40C07C59/08
Inventor 尹海旭殷恒波王爱丽沈灵沁
Owner JIANGSU UNIV