A kind of ethylene carbonate continuous melt crystallization equipment and method

Abstract

The invention discloses a ethylene carbonate continuous melting and crystallization equipment and method. The equipment has a vertical structure and is divided into a crystallization area, a crystal bed area and a melting area along the axial direction of the equipment. The crystallization area is equipped with heat exchange fins and stirring The scraper is used to cool down and crystallize the raw solution of ethylene carbonate. The crystals sink down into the crystal bed section under gravity and mechanical action, where they are piled up to form a crystal bed of a certain height. The melting zone is equipped with heat exchange fins to provide crystals. The heat required for melting, part of the molten liquid is discharged from the outlet at the bottom of the crystallization equipment, and part of it flows upwards through the crystal bed in the axial direction, because the high-purity molten liquid carries heat, and when it flows countercurrently, it will produce ethylene carbonate crystals in the crystal bed Heat and mass exchange to realize the sweating process of ethylene carbonate. The continuous melting and crystallization equipment and method of the present invention can be used to prepare electronic grade ethylene carbonate, and has the advantages of high product purity, high production efficiency, compact equipment structure, low energy consumption, continuous and stable operation, and the like.

Description

technical field [0001] The invention belongs to the field of crystallization and purification, in particular to a continuous melting crystallization device and method for ethylene carbonate. Background technique [0002] Ethylene carbonate is a polar high-boiling solvent with good performance, and it can also be used as a surfactant raw material and an organic synthesis intermediate. It is widely used in the field of organic synthesis, for example, furazolidone, dimethyl carbonate, ethylene glycol, functional polymer materials, etc. can be further produced by using ethylene carbonate as raw material. At the same time, ethylene carbonate can also be used for polymer modification. A very important chemical basic raw material. In recent years, with the rapid development of the new energy field, the demand for ethylene carbonate as a battery electrolyte has continued to increase, and the market has continued to expand. At the same time, higher requirements have been placed on t...

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Problems solved by technology

[0003] There have been related patent reports on the separation and purification of ethylene carbonate by melting crystallization, such as Japanese patent document JP-7-89905 and Chinese patent CN201811248553.3, but most of them are intermittent operations, which have low production efficiency, high labor intensity, and need to change jobs Condition control, unstable product quality and other issues

At the same time, since the intermittent process needs to continuously switch between hot and cold media for temperature rise and fall, a large part of energy consumption is wasted, which cannot well reflect the energy-saving advantages of the crystallization process

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