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Method for preparing lactic acid by using Cu-Pd (copper-palladium) alloy catalyst to catalyze high-concentration glycerin

An alloy catalyst, high-concentration technology, used in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, preparation of organic compounds, etc. And glycerol conversion rate is low, undisclosed catalyst recycling performance and other problems, to achieve good industrialization prospects, high recycling performance, low investment effects

Inactive Publication Date: 2017-09-29
JIANGSU UNIV
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Problems solved by technology

The noble metal aerobic catalysis method and the high temperature hydrothermal non-oxidation method have disadvantages such as high cost of noble metal catalysts
[0005] 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 China, and the conversion rate of glycerin can be 70-100%, and the selectivity of lactic acid is 67-90%. This technology uses non-noble metals as catalysts, and the catalyst cost is low, but the selectivity of lactic acid and the conversion rate of glycerin are low, and the catalyst cycle is not disclosed. use performance
[0006] For the reaction temperature of this reaction, high pressure, long reaction time, high cost of noble metal catalysts, low catalytic activity of non-noble metals and problems of catalyst reuse, the present invention proposes to use a recyclable bimetallic Cu-Pd alloy catalyst, the non-noble metal / The noble metal alloy catalyst has high activity in catalyzing the preparation of lactic acid from glycerol, and has good recycling characteristics

Method used

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  • Method for preparing lactic acid by using Cu-Pd (copper-palladium) alloy catalyst to catalyze high-concentration glycerin
  • Method for preparing lactic acid by using Cu-Pd (copper-palladium) alloy catalyst to catalyze high-concentration glycerin
  • Method for preparing lactic acid by using Cu-Pd (copper-palladium) alloy catalyst to catalyze high-concentration glycerin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Copper-palladium alloy catalyst (CuPd 2 ) preparation: weigh 1.8268g Cu(NO 3 ) 2 ·3H 2 O and 0.04028g 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 40 mL of 12.5% ​​polyethylene glycol 20000 absolute ethanol solution and ultrasonically treated for 30 min to completely dissolve it, then pour the solution into a round bottom flask equipped with a stirrer, and preheat it in a water bath at 55°C for 15 min , adjust the pH value of the solution to 8-9 with a saturated NaOH solution in absolute ethanol, and then add a solution of hydrazine hydrate in absolute alcohol mixed with 6 mL of hydrazine hydrate and 80 mL of absolute ethanol dropwise to the reaction solution in the round-bottomed flask , reacted in a water bath for 2h, 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 reacted for half an hour, ...

Embodiment 2

[0039] Copper palladium alloy catalyst (CuPd 3 ) preparation: preparation conditions and steps are the same as CuPd in ​​Example 1 2 Catalyst preparation method is the same, 1.827g Cu(NO 3 ) 2 ·3H 2 O and 0.040g 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.

[0040] Weigh 36.8g glycerol (Sinopharm Chemical Reagent Co., Ltd.), use a 100mL volumetric flask to make a constant volume, add it to a 300mL autoclave, then weigh 19.6g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 1.47g CuPd 3 , together into the autoclave, evacuate with high-purity nitrogen, then seal the autoclave, stir at 300rpm, heat the autoclave to 180-240°C, 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, calcula...

Embodiment 3

[0052] 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, 1.827g Cu(NO 3 ) 2 ·3H 2 O and 0.040g Pd(NO 3 ) 2 2H 2 O was changed to 1.769g Cu(NO 3 ) 2 ·3H 2 O and 0.078g Pd(NO 3 ) 2 2H 2 O.

[0053] Weigh 36.8g glycerol (Sinopharm Chemical Reagent Co., Ltd.), use a 100mL volumetric flask to make a constant volume, add it to a 300mL autoclave, then weigh 19.6g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 1.47g CuPd 4 , together into the autoclave, evacuate with high-purity nitrogen, then seal the autoclave, stir at 300rpm, heat the autoclave to 180-240°C, start timing, and react for 2 hours.

[0054] 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, calcula...

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Abstract

The invention provides a method for preparing lactic acid from high-concentration glycerin catalyzed by a Cu-Pd alloy catalyst. The steps are as follows: using biomass glycerin as a raw material, the reaction temperature is 180-240°C, and the reaction time is 1-2h. Under an alkaline environment, a Cu-Pd alloy catalyst is added, and the reaction is carried out in an oxygen-free high-pressure reactor to obtain lactic acid. The method of the invention has the advantages of low reaction temperature, high glycerin conversion rate, high target product selectivity, fast reaction rate, high catalyst reusability, simple process, safety and environmental protection, etc., and has good industrialization prospect.

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; in the pharmaceutical industry, lactic acid has a strong bactericidal effect, strong polarity and hydrophilicity, and at the same time it can be used as an astringent bactericide, which can also reduce Serum cholesterol, enhance human immunity. In addition, la...

Claims

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Application Information

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IPC IPC(8): C07C51/295C07C59/08B01J23/89
CPCC07C51/295B01J23/8926
Inventor 周心殷恒波沈灵沁
Owner JIANGSU UNIV
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