Method for preparing lactic acid

A technology of lactic acid and titanium-silicon molecular sieves, which is applied in the preparation of carboxylate, carbon-based compounds, chemical instruments and methods, etc., can solve the problems that lactic acid cannot be produced and applied on a large scale, the reaction route is long, and the air environment is polluted. Achieve the effect of being suitable for large-scale industrial production application, high conversion rate and lactic acid yield, safe and efficient process

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has a long reaction route, high production cost and produces a large amount of solid waste, which makes it impossible to realize large-scale production and application of lactic acid at present.
The commonly used chemical synthesis methods are the lactonitrile method and the propionic acid method. The lactonitrile method uses acetaldehyde and highly toxic hydrocyanic acid as the reaction raw materials, and concentrated sulfuric acid as the catalyst. Therefore, the production process is seriously polluted and has potential safety hazards.
The propionic acid method uses toxic chlorine gas as a raw material, which not only requires high operational safety and airtightness, but also easily pollutes the atmospheric environment

Method used

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  • Method for preparing lactic acid

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0046] This preparation example prepares Sn-MFI molecular sieve, and specific preparation method is:

[0047] tin tetrachloride pentahydrate (SnCl 4 .5H 2 O) Dissolve in water, add this aqueous solution to tetraethyl orthosilicate (TEOS) and stir, add tetrapropylammonium hydroxide (TPAOH, 20% aqueous solution) and water under stirring, and continue stirring for 30 minutes to obtain a chemical composition of 0.03SnO 2 : SiO 2 :0.45TPA: 35H 2 The clear liquid of O was then crystallized at 433K for 2 days, and then the obtained solid was filtered, washed with distilled water, dried at 393K for 5 hours, and then calcined at 823K for 10 hours to obtain a molecular sieve sample. Among them, the amount of TEOS is 15.31g, the amount of TPAOH is 33.67g, SnCl 4 .5H 2 The amount of O used is 0.38g, and the amount of water used is 39.64g.

preparation Embodiment 2

[0049] This preparation example references "Nemeth L, Moscoso J, Erdman N, et al.Synthesis and characterization of Sn-Beta as a selective oxidation catalyst [J]. Studies in Surface Science & Catalysis, 2004, 154 (04): 2626-2631" Method prepares Sn-Beta molecular sieve, the preparation method of the adopted Sn-Beta molecular sieve is:

[0050] tin tetrachloride pentahydrate (SnCl 4 .5H 2 O) Dissolve in water, add tetraethyl ammonium hydroxide (TEAOH) to this aqueous solution and stir with tetraethyl ammonium hydroxide (TEAOH), stir until TEOS evaporates to obtain alcohol, add hydrogen fluoride (HF) to the clarified liquid , forming a paste-like thin layer. Finally, a suspension of dealuminated nano Beta seeds (20nm) and water is added to obtain a chemical composition of 0.03SnO 2 : SiO 2 :6TEA:15H 2 O: 10HF clear liquid, then crystallized at 413K for 10 days, then filtered the obtained solid, washed with distilled water, dried at 393K for 5 hours, and then roasted at 823K ...

preparation Embodiment 3

[0052] References for this preparation example "Yang X, Wu L, Wang Z, et al. Conversion of dihydroxyacetone to methyl lactate catalyzed by highly active hierarchical Sn-USY at room temperature [J]. Catalysis Science & Technology, 2016, 6 (6): 1757- 1763" method to prepare Sn-USY molecular sieve, the preparation method of the adopted Sn-USY molecular sieve is:

[0053] H-USY molecular sieve was mixed with nitric acid, treated at 85°C for 8h, the sample was filtered and washed with deionized water, and dried at 120°C for 12h to obtain a solid sample. This solid sample was mixed with tin tetrachloride pentahydrate (SnCl 4 .5H 2 O) mixed for 1h to obtain a chemical composition of 0.03SnO 2 : 100SiO2 2 The mixed liquid was dried at 100°C for 12 hours, and finally calcined at 550°C for 3 hours to obtain a molecular sieve sample. Among them, the amount of H-USY is 2.0g, the amount of nitric acid is 50mL, the amount of SnCl 4 .5H 2 The amount of O used is 0.6 g.

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Abstract

The invention relates to a method for preparing lactic acid. The method comprises the following steps of: contacting reaction raw materials, water and a catalyst in a reactor, and reacting to obtain aproduct containing lactic acid, wherein the reaction raw materials contain dihydroxy acetone and/or glyceraldehydes, a molar ratio of dihydroxyacetone and/or glyceraldehydes to water is 1:(50-450), the reaction temperature is 30-180 DEG C, the reaction time is 1-10 hours, the catalyst contains a mixture of a titanium-silicon molecular sieve and a tin-silicon molecular sieve, and the weight ratioof dihydroxy acetone and/or glyceraldehyde to the mixture of the titanium-silicon molecular sieve and the tin-silicon molecular sieve (calculated as dry basis weight) is 1:(0.1-6). The method providedby the invention has high conversion rate of dihydroxyacetone/glyceraldehyde and high yield of lactic acid.

Description

technical field [0001] The present invention relates to a method for preparing lactic acid. Background technique [0002] Lactic acid (scientific name: 2-hydroxypropionic acid) is a compound that plays a role in a variety of biochemical processes with the formula C 3 h 6 o 3 . It is a carboxylic acid containing a hydroxyl group and is therefore an alpha-hydroxy acid. In aqueous solution, its carboxyl group releases a proton to produce lactate ion. Lactate dehydrogenase converts pyruvate to L-lactate during fermentation. Lactate is continuously produced during normal metabolism and exercise, but its concentration generally does not rise. Lactic acid is a colorless liquid, and the industrial product is a colorless to pale yellow liquid. Odorless, hygroscopic, relative density 1.200, melting point 18°C, boiling point 122°C, flash point greater than 110°C, miscible with ethanol, ether, water, glycerin, insoluble in chloroform, carbon disulfide and petroleum ether, widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/00C07C45/51C07C45/52C07C49/185C07C51/00C07C59/08B01J29/89B01J37/10
CPCC07C45/00C07C45/512C07C45/52C07C51/00B01J29/89B01J37/10B01J37/0018B01J2229/18C07C49/185C07C59/08
Inventor 林民刘聿嘉赵毅夏长久彭欣欣朱斌罗一斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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