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a load type 2 o 3 Catalyst and its application in catalyzing cellulose hydrolysis to produce lactic acid

A supported, catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation of organic compounds, etc., can solve the problem of difficult separation, low lactic acid yield, and difficulty in industrial production. and other problems, to achieve the effects of easy separation, high conversion rate, and high recycling activity

Inactive Publication Date: 2016-11-23
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2011, 105, 171-181) reported a method of using aluminum tungstate (AlW) as a catalyst for cellulose hydrolysis to produce lactic acid. After reacting at 190°C for 24 hours, the conversion rate of cellulose is 45%, and the yield of lactic acid is only 27%. The yield of lactic acid is low, and it is difficult to be used in industrial production
The invention patent application with the publication number CN104045545A discloses a method for producing lactic acid from glycerin with a supported catalyst, which uses glycerol as a raw material, supports copper oxide as a catalyst, and supports MgO, ZrO 2 、TiO 2 , CeO 2 With metal oxides including ZnO, activated carbon or hydroxyapatite, the selectivity of lactic acid can reach 70% to 90%, and the conversion rate of glycerol can reach 72% to 100%, but the reaction is carried out under alkaline conditions, and the product It is not easy to separate from the lye, and the catalyst has poor cycle performance and short service life, so it is not suitable for large-scale production of lactic acid
[0004] In the above-mentioned method for producing lactic acid, it may need to add lye (corrosion to equipment at high temperature), or the yield of lactic acid is low, the economy is poor, or the life of the catalyst is short, which is difficult to meet the requirements of industrialization

Method used

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  • a load type <sub>2</sub> o <sub>3</sub> Catalyst and its application in catalyzing cellulose hydrolysis to produce lactic acid
  • a load type <sub>2</sub> o <sub>3</sub> Catalyst and its application in catalyzing cellulose hydrolysis to produce lactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put the aluminum hydroxide powder in a muffle furnace, raise the temperature to 800 °C at a rate of 5 °C / min and keep it for 3 hours to obtain Al 2 o 3 ; 0.4652g bait nitrate pentahydrate was completely dissolved in 4mL distilled water, and the gained solution was added to 4g Al under stirring condition 2 o 3 In the process, stir and impregnate at room temperature for 24 hours, then stir and dry at 40°C, place the obtained solid in an oven at 110°C for 12 hours, take it out and grind it through a 100-mesh sieve, and put the sieved powder into a tube furnace. Under the nitrogen flow rate of 40mL / min, the temperature was raised to 550°C at a heating rate of 5°C / min, and kept at a constant temperature for 3 hours to obtain an Er oxide with a loading capacity of 5wt%. 2 o 3 / Al 2 o 3 .

Embodiment 2

[0017] Dissolve 0.9304 g of bait nitrate pentahydrate completely in 4 mL of distilled water, and add the resulting solution to 4 g of Al 2 o 3 (The preparation method is the same as in Example 1), after stirring and impregnating at room temperature for 24 hours, stirring and drying at 40°C, placing the resulting solid in an oven at 110°C for 12 hours, taking it out and grinding it through a 100-mesh sieve, after sieving Put the powder into a tube furnace, raise the temperature to 550°C at a rate of 5°C / min at a nitrogen flow rate of 40mL / min, and keep the temperature at a constant temperature for 3 hours to obtain Er oxide with a loading capacity of 10wt%. 2 o 3 / Al 2 o 3 .

Embodiment 3

[0019] Dissolve 1.3956 g of bait nitrate pentahydrate completely in 4 mL of distilled water, and add the resulting solution to 4 g of Al 2 o 3 (The preparation method is the same as in Example 1), after stirring and impregnating at room temperature for 24 hours, stirring and drying at 40°C, placing the resulting solid in an oven at 110°C for 12 hours, taking it out and grinding it through a 100-mesh sieve, after sieving Put the powder into a tube furnace, raise the temperature to 550°C at a rate of 5°C / min at a nitrogen flow rate of 40mL / min, and keep the temperature at a constant temperature for 3 hours to obtain Er oxide with a loading capacity of 15wt%. 2 o 3 / Al 2 o 3 .

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Abstract

The invention discloses a load-type Er2O3 catalyst and an application thereof in preparation of lactic acid hydrolyzed by catalyzing cellulose. The catalyst is prepared in such a way that any one of Al2O3, active carbon, ZrO2 and TiO2 is used as a carrier, Er2O3 is an active component and the load capacity of the Er2O3 is 5-30 percent, and the steeping on the components is carried out. The catalyst is used for catalyzing the cellulose to hydrolyze lactic acid under a nitrogen atmosphere and a hydrothermal condition of 230-260 DEG C, so that the activity of the catalyst is high, the conversion rate of the cellulose can reach 100 percent, the selectivity and the yield of the lactic acid are high; the obtained product is easily separated from the catalyst, and the recovered catalyst can be recycled; and the catalyst is high in circulation activity and suitable for industrial production.

Description

technical field [0001] The invention relates to a catalyst for producing lactic acid by hydrolyzing cellulose, in particular to an Al 2 o 3 , activated carbon, ZrO 2 、TiO 2 Loaded Er 2 o 3 Catalyst and its application in catalyzing the hydrolysis of cellulose to produce lactic acid. Background technique [0002] Lactic acid has important applications in many fields such as pharmaceutical industry, industrial industry, beauty industry, and agricultural industry. At present, the preparation method of lactic acid is mainly based on fermentation method. The fermentation method generally uses corn, rice, sweet potato and other starchy materials or alfalfa and cellulose as raw materials. In the lactic acid fermentation stage, there are many lactic acid bacteria that can produce acid, but the output of lactic acid is not much, and the fermentation process takes a long time. Cellulose is a kind of renewable biomass, which is abundant and very cheap. Under certain catalytic co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10C07C59/08C07C51/00
CPCY02P20/584
Inventor 董文生李浩杨贝贝刘春玲杨高源刘杰
Owner SHAANXI NORMAL UNIV