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Method for preparing lactic acid by using alkaline-earth metal modified Sn-beta catalyst

An alkaline earth metal and catalyst technology, applied in the field of lactic acid production, can solve the problems of limited sources of monosaccharide and polysaccharide reactants, low cellulose hydrolysis efficiency, small contact area, etc., and achieve short preparation cycle, high atom utilization rate, and process easy-to-use effects

Inactive Publication Date: 2019-12-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some progress has been made in the heterogeneous catalysis of lactic acid from monosaccharide or polysaccharide reported so far, they generally face the problems of low yield and limited sources of monosaccharide and polysaccharide reactants themselves; and in reaction systems with poor water solubility such as cellulose In this method, the solid acid catalyst used reacts with the substrate in a solid-solid manner, and the contact area is small, resulting in low cellulose hydrolysis efficiency.

Method used

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  • Method for preparing lactic acid by using alkaline-earth metal modified Sn-beta catalyst
  • Method for preparing lactic acid by using alkaline-earth metal modified Sn-beta catalyst
  • Method for preparing lactic acid by using alkaline-earth metal modified Sn-beta catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Preparation of catalyst:

[0026] The preparation method of Sn-β-Ca is: mix 0.4g Sn-β catalyst with 20mL 1.0M Ca(NO 3 ) 2 The solution was subjected to ion exchange reaction at 353K, the reaction time was 12h, after centrifugation, the obtained solid was washed with deionized water several times, then the obtained solid was dried at 120°C for 12h, and then calcined at 773K in a muffle furnace for 5h, and the obtained catalyst was recorded as It is Sn-β-Ca.

[0027] (2) Preparation of lactic acid:

[0028] With 0.05g levoglucosan as substrate in reactor, 20mL deionized water is solvent, add the catalyst Sn-beta-Ca prepared in 0.2g step (1), add the lactic acid of 0.2mmol as B acid; Reaction conditions For: the reaction pressure is 2MPa N2, the reaction temperature is 190°C, and the reaction time is 120min. After the reaction finishes, carry out the productive rate analysis of lactic acid with high performance liquid chromatography, and the productive rate result ...

Embodiment 2

[0030] The preparation step of catalyst is similar to embodiment 1, and difference is: Ca(NO 3 ) 2 The solution was changed to Mg(NO 3 ) 2 Solution, the gained catalyzer is recorded as Sn-β-Mg; The preparation of lactic acid is similar to embodiment 1, and difference is: the catalyst Sn-β-Be is replaced by catalyst Sn-β-Mg; All the other conditions are the same as the productive rate of lactic acid The results are shown in Table 1.

Embodiment 3

[0032] The preparation step of catalyst is similar to embodiment 1, and difference is: Ca(NO 3 ) 2 The solution was changed to Be(NO 3 ) 2 Solution, the gained catalyzer is recorded as Sn-β-Be; The preparation of lactic acid is similar to embodiment 1, and difference is: change catalyzer Sn-β-Ca into catalyzer Sn-β-Be; All the other conditions are the same productive rate of lactic acid The results are shown in Table 1.

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Abstract

The invention discloses a method for preparing lactic acid by using an alkaline-earth metal modified Sn-beta catalyst. The method comprises the following steps: carrying out ion exchange reaction on an Sn-beta catalyst and an alkaline-earth metal solution to prepare the alkaline-earth metal modified catalyst; and mixing the catalyst, a saccharide substrate and a solvent, adding lactic acid, and carrying out lactic acid preparation reaction. In the catalytic reaction process, hydrolysis of levoglucosan and the polysaccharide substrate can be promoted by externally adding lactic acid, Sn is taken as an L acid active site in the reaction, alkaline earth metal ions and adjacent skeleton oxygen are taken as Lewis acid-base pair active sites, and generation of a trans-aldol reaction can be promoted through the synergistic effect of Sn, the alkaline earth metal ions and the adjacent skeleton oxygen, so that the selectivity of lactic acid is improved. Compared with other methods, the method provided by the invention has the advantages of simple catalyst preparation, short reaction time, good catalytic effect, easy industrialization and the like. The substrate used in the catalytic method is suitable for biomass thermal cracking product levoglucosan which can be obtained on a large scale, and has a good effect on high-molecular polysaccharides such as cellulose and inulin.

Description

technical field [0001] The invention relates to a method for preparing lactic acid, in particular to a method for using an alkaline earth metal modified Sn-β catalyst to prepare lactic acid. Background technique [0002] The production of lactic acid traditionally uses the method of glucose fermentation (Datta, R.; Henry, M., Lactic acid: recent advances in products, processes and technologies-a review. Journal of Chemical Technology & Biotechnology [J]. 2006, 81 (7): 1119-1129), however, this biofermentation method suffers from many limitations, such as low production efficiency, high separation cost, large amount of waste liquid and complicated purification process. Therefore, it is necessary to develop new lactic acid production processes. Compared with the traditional biological fermentation method, the chemical catalytic method has more advantages, such as: higher concentration of lactic acid can be produced, easier separation method, higher production efficiency, lowe...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C51/00C07C59/08
CPCB01J29/7057B01J2229/18C07C51/00C07C59/08
Inventor 万绍隆迟子鑫胡文达王勇
Owner XIAMEN UNIV
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