Method for synthesizing lactic acid by using glycerol

Abstract

The invention discloses a synthesis method of lactic acid by using glycerol, which is characterized in that the glycerol is adopted as the material; the lactic acid is obtained via reaction under the alkaline condition with the reaction pressure of 1 to 15 atm, the reaction temperature of 20 to 140 DEG C, the reaction time of 0.5 to 48 h and the catalyst and the oxidant existing; and when the synthesis method of lactic acid is adopted, the glycerol can be partially converted into the lactic acid with conversion rate of the glycerol being 12% to 70%, selectivity of the lactic acid being 33% to 81% and yield of the lactic acid being 9.7% to 32%. The synthesis method of lactic acid by using glycerol has the advantages that high reaction temperature is not needed, and the reaction can be conducted under the condition of normal temperature or close to normal temperature, thus a large amount of energy is saved; the reaction is conducted under the condition of atmospheric pressure or close to atmospheric pressure with the oxygen existing, thus requirement to equipments is low and investment is small; and the reaction system is simple which is beneficial to industrialization, and the catalyst has long service life without loss.

Description

technical field [0001] The invention relates to a method for synthesizing lactic acid from glycerin. Background technique [0002] Lactic acid is an organic acid with a wide range of uses. It has a wide range of uses in food, medicine, light industry, tobacco, plastics and paints. Polylactic acid obtained from lactic acid is the future due to its biodegradability and excellent physical and chemical properties. Ideal polymer material. At present, the main methods of industrial production of lactic acid are starch fermentation and chemical synthesis. Among them, the starch fermentation method has problems such as uncontinuous production, large consumption of raw materials, high energy consumption, and unstable product quality; the chemical synthesis methods mainly include lactonitrile method and acrylonitrile method. Low consumption, but due to the use of acetaldehyde and highly toxic hydrocyanic acid and other substances in the raw materials, there is a greater risk of poll...

AI Technical Summary

Problems solved by technology

The problem that this method exists is: (1) needs to use a large amount of H in the reaction 2 As a reaction raw material, while H 2 It is a very important energy source, its source is limited, its cost is high, and it is not easy to store and transport; Avoid avoiding equipment corrosion, increasing equipment investment costs, and unsafe operation process

The problem with this method is that the temperature required for the reaction process is relatively high, which imposes strict requirements on the production equipment.

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