Method for producing lactic acid from glycerin catalyzed by a supported catalyst
A catalyst-catalyzed glycerol, supported technology, used in chemical instruments and methods, physical/chemical process catalysts, oxidation of carboxylic acids, etc., can solve the problem of high reaction temperature and reaction pressure, low reaction concentration of glycerol, long reaction time, etc. problem, to achieve the effect of low reaction temperature and reaction pressure, good industrial prospects, and fast reaction rate
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Embodiment 1
[0020] Weigh 4.58g of sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 0.46g of 5% CuO / MgO into a 400mL autoclave, then weigh 9.20g of glycerin (Sinopharm Chemical Reagent Co., Ltd.) with a 100mL volumetric flask Make constant volume, add it into the reaction kettle, ventilate it with nitrogen gas, then seal it well, heat it to 230°C, time it, and react for 2 hours.
[0021] At the end of the reaction, take 20mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2~3, measure the volume after acidification, transfer 1mL with a pipette and dilute it to 25mL with deionized water, and perform high performance liquid chromatography detection to determine the content of lactic acid. Yield; then use a pipette to 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 95%, and the selectivity of lactic acid is 89%.
[0022] Reaction conditions: Glycero...
Embodiment 2
[0024] Weigh 4.58g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 0.46g20%CuO / ZrO 2 , put them together into a 400mL autoclave, then weigh 9.20g of glycerin (Sinopharm Chemical Reagent Co., Ltd.) and use a 100mL volumetric flask to make a constant volume, add it to the autoclave, pass in nitrogen to evacuate, then seal it well, and heat After reaching 230°C, the timer was used to react for 4 hours.
[0025] At the end of the reaction, take 20mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2~3, measure the volume after acidification, transfer 1mL with a pipette and dilute it to 25mL with deionized water, and perform high performance liquid chromatography detection to determine the content of lactic acid. Yield; pipette 20 μL of 1 mL acidified sample for gas chromatography analysis; analysis shows that the conversion rate of glycerol is 75%, and the selectivity of lactic acid is 70%.
[0026] Reaction conditions: Glycerol concentra...
Embodiment 3
[0028] Weigh 4.58g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 0.46g20%CuO / TiO 2 , put them together into a 400mL autoclave, then weigh 9.20g of glycerin (Sinopharm Chemical Reagent Co., Ltd.) and use a 100mL volumetric flask to make a constant volume, add it to the autoclave, pass in nitrogen to evacuate, then seal it well, and heat After reaching 230°C, time it and react for 2 hours.
[0029] At the end of the reaction, take 20mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2~3, measure the volume after acidification, transfer 1mL with a pipette and dilute it to 25mL with deionized water, and perform high performance liquid chromatography detection to determine the content of lactic acid. Yield; then pipette 20 μL of 1 mL acidified sample for gas chromatography analysis; the analysis shows that the conversion rate of glycerol is 85%, and the selectivity of lactic acid is 90%.
[0030] Reaction conditions: Glycerol concentrat...
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