Reaction circulation rectification process method for producing ethyl methyl carbonate and diethyl ester

Abstract

The invention discloses a reaction circulation rectification process method for producing ethyl methyl carbonate and diethyl carbonate, which is characterized in that a solid catalyst is filled on a tower plate of a reaction rectification section, and the reaction rectification process for producing ethyl methyl carbonate and diethyl carbonate is divided into an independent gas phase stage and a liquid phase stage. In the gas phase operation stage, the liquid is still on the tower tray, steam flows to the condenser from the reboiler, and the gas phase and the liquid phase transfer mass and heat on the tower tray and are subjected to ester exchange reaction in the tower tray liquid phase; in the liquid phase operation stage, the steam stops, and the liquid moves among the trays; the periodic operation of the gas phase and the liquid phase is realized through a tower internal part provided with a valve and a gate chamber positioned below the tower tray; in the gas phase operation stage, the valve on the tower tray is closed; in a liquid phase operation stage, a valve is opened, liquid flows to a lock chamber below from a tower tray, periodic feeding of raw materials of dimethyl carbonate and ethanol is completed, azeotrope of dimethyl carbonate and methanol is extracted from the top of a reactive distillation tower, and ethyl methyl carbonate and diethyl carbonate are extracted from a tower kettle.

Description

technical field [0001] The invention relates to reaction and rectification process strengthening, relates to a production method of lithium battery electrolyte solvent ethyl methyl carbonate and diethyl carbonate, in particular to a reaction cycle rectification process method for producing ethyl methyl carbonate and diethyl carbonate . Background technique [0002] As an important means of process enhancement, reactive distillation is used in systems such as esterification, hydrolysis, transesterification, and disproportionation. For processes with limited equilibrium, it can significantly increase the yield of the target product and reduce the energy consumption and equipment of the reaction and separation process. invest. However, due to the space limitation of the tray space and the limited loading of the catalyst, it is difficult to control the reaction residence time, especially the single-pass conversion rate of the reactive distillation process of the reaction rate-c...

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Problems solved by technology

[0004] Aiming at the problems of large liquid phase flow resistance, limited reaction residence time, low single-pass conversion rate of raw materials and tray separation efficiency, and high process energy consumption in the existing reactive distillation column, the present invention aims to propose a method for producing ethyl methyl carbonate and The reaction cycle rectification process method of diethyl carbonate, the reaction cycle rectification process can flexibly change the loading amount of the catalyst, increase the conversion rate and yield of the target product by precisely controlling the residence time of the liquid phase reaction, and increase the conversion rate and yield of the target product through the independent gas-liquid phase The operation makes the distribution of the liquid phase on the tray more uniform, reduces the flow resistance of the liquid phase on the tray, and significantly increases the throughput and separation performance of the process

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