Method for preparing propionic acid by catalysis of lactic acid

Abstract

The invention discloses a method for preparing propionic acid by catalyzing lactic acid, which comprises the following steps: firstly, adding materials into the reaction tank of the reaction component of the preparation device respectively, closing the sealing cover of the reaction tank, and then opening the heating component of the reaction component to heat the material, The material is reacted in the reaction tank, and when the reaction is completed, the sealing cover is opened, and the reacted material is discharged from the discharge pipe opened at the bottom of the reaction tank. In the present invention, by setting the reaction component and the circulation component, the liquid in the circulation tank flows into the reaction tank. When the liquid passes through the rotary nozzle and enters the upper rotary nozzle and the first lower rotary nozzle, it rotates under the thrust of the liquid ejection. The second Rotate the nozzle once to rotate and spray the liquid downward, and the sprayed liquid is sprayed to the bottom of the reaction tank to accelerate the flow rate of the liquid at the bottom of the reaction tank, so as to avoid catalysts, reducing agents, etc. from sinking to the bottom.

Description

technical field [0001] The invention relates to the technical field of chemical equipment. Specifically, it is a method for preparing propionic acid by catalyzing lactic acid. Background technique [0002] Propionic acid has a wide range of uses, mainly used as esterification agent, plasticizer, chemical reagent and food raw materials, etc.; when preparing propionic acid through lactic acid catalysis, it is necessary to put lactic acid, catalyst, reducing agent and other raw materials into the hydrothermal reactor Heating inside to prepare propionic acid. Most of the existing hydrothermal reactors use magnetic stirring and motor-driven stirring in the stirring methods. The stirring efficiency of magnetic stirring is greatly affected by the magnetic force, and the stirring effect is not ideal. However, the motor-driven Stirring requires high sealing requirements on the stirring shaft, resulting in complex equipment structure and high cost; and because the hydrothermal reacto...

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Problems solved by technology

[0002] Propionic acid has a wide range of uses, mainly used as esterification agent, plasticizer, chemical reagent and food raw materials, etc.; when preparing propionic acid through lactic acid catalysis, it is necessary to put lactic acid, catalyst, reducing agent and other raw materials into the hydrothermal reactor Heating inside to prepare propionic acid. Most of the existing hydrothermal reactors use magnetic stirring, motor-driven stirring, etc. in the stirring method. The stirring efficiency of magnetic stirring is greatly affected by the magnetic force, and the stirring effect is not ideal. Stirring requires high sealing requirements on the stirring shaft, resulting in complex equipment structure and high cost; and because the hydrothermal reactor needs to withstand high pressure, its wall thickness is relatively large, resulting in low heat transfer efficiency and slow cooling, which affects the preparation speed. After the reaction, it is necessary to filter the reaction product to remove the catalyst. Filtration for a long time will block the pores of the filter screen, resulting in a decrease in filtration efficiency.

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