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Crystallization apparatus and purification method for refining and purifying ethylene carbonate

A ethylene carbonate and crystallization device technology, which is applied in the field of crystallization devices for refining and purifying ethylene carbonate, can solve problems such as low yield, residual impurities, unstable product quality, etc., and achieve high yield, low cost, and suitable for large-scale The effect of production

Pending Publication Date: 2018-08-24
LIAONING GANGLONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a crystallization device and a purification method for the refining and purification of ethylene carbonate, which solves the problem of low yield and product failure in the purification of ethylene carbonate by distillation, rectification or a combination of adsorption and rectification in the prior art. Unstable quality and residual impurities

Method used

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  • Crystallization apparatus and purification method for refining and purifying ethylene carbonate
  • Crystallization apparatus and purification method for refining and purifying ethylene carbonate
  • Crystallization apparatus and purification method for refining and purifying ethylene carbonate

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Embodiment 1

[0035] A crystallization device for refining and purifying ethylene carbonate, specifically as Figure 1-3 As shown, it includes an external crystallizer 1 with a cylindrical structure and an embedded crystallizer 2 with a cylindrical structure coaxially sleeved in the external crystallizer 1. The top of the external crystallizer 1 is provided with an upper head, The bottom end is provided with a lower head, the upper head is provided with a feed pipe 3, and the lower head is provided with a circulating fluid outlet pipe 4;

[0036] The bottom of the embedded crystallizer 2 is fixedly connected to the lower head, the top of the embedded crystallizer 2 is provided with a liquid distribution pan 5, and the bottom end is provided with a liquid collection tray 6; the upper end of the embedded crystallizer 5 is provided with a circulating liquid inlet The liquid pipe 7, the circulation pipe 8 is connected between the circulation liquid inlet pipe 7 and the circulation liquid outlet...

Embodiment 2

[0046] A method for purifying ethylene carbonate, comprising the steps of:

[0047] Step 1, feed: Add ethylene carbonate with a purity of 98.000% and a temperature of 40-45°C after being purified by a rectifying tower into the external crystallizer 1 from the feed pipe 3, and then use the circulation pump 9 to feed the ethylene carbonate The ester is sent into the crystallization tube 12 in the embedded crystallizer 2 through the liquid distribution tray 5 at a rate of 5L / h;

[0048] Step 2, cooling crystallization: during the process of ethylene carbonate entering the crystallization tube 12, gradually reduce the temperature in the external crystallizer 1 at a cooling rate of 0.1°C / h, so that after the ethylene carbonate enters the crystallization tube 12, the crystallization tube The inner wall of 12 forms a crystalline layer, and when the temperature in the external crystallizer 1 drops to 32-34°C, stop the cooling, and stop feeding the crystallization tube 12 at the same t...

Embodiment 3

[0052] A method for purifying ethylene carbonate, comprising the steps of:

[0053] Step 1, feed: Add ethylene carbonate with a purity of 99.851% and a temperature of 40-45°C after being purified by a rectifying tower into the external crystallizer 1 from the feed pipe 3, and then use the circulation pump 9 to circulate the carbonic acid Vinyl ester is sent into the crystallization tube 12 in the embedded crystallizer 2 through the liquid distribution tray 5 at a rate of 3L / h;

[0054] Step 2, cooling and crystallization: during the process of ethylene carbonate entering the crystallization tube 12, gradually reduce the temperature in the external crystallizer 1 at a cooling rate of 1 °C / h, so that after the ethylene carbonate enters the crystallization tube 12, the crystallization tube The inner wall of 12 forms a crystalline layer, and when the temperature in the external crystallizer 1 drops to 32-34°C, stop the cooling, stop feeding the crystallization tube 12 at the same ...

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Abstract

The invention discloses a crystallization apparatus for refining and purifying ethylene carbonate and a purification method with its application. Specifically the ethylene carbonate obtained through the rectification and purification processes is transported into a crystallizer to be crystallized by a stepwise cooling method. Through step-by-step heating and melting processes, the ethylene carbonate of over 99.99% purity is obtained. The invention introduces a continuous industrial production, which solves the problems such as high energy consumption, high cost and unmanageable quality controlin preparing high-purity ethylene carbonate in the prior art. By comparison, the obtained product has the advantages of high purity, high yield, stable quality and low cost. In addition, the invention has the advantages of simple processes, convenient operation, easy control, low energy consumption, less equipment investment, low operation cost, stable and reliable operation, high safety, considerable economic benefit and suitability for mass production.

Description

technical field [0001] The invention belongs to the technical field of fine chemical production, and in particular relates to a crystallization device and a purification method for refining and purifying ethylene carbonate. Background technique [0002] Ethylene carbonate, also known as 1,3-dioxolan-2-one, has the molecular formula C 3 h 4 o 3 EC, referred to as EC, is an organic solvent with excellent performance, soluble in water, ethanol, benzene, acetone and other solvents, can dissolve polyacrylonitrile, polyvinyl chloride, etc., and can be used to prepare dimethyl carbonate, diphenyl carbonate, Ethylene glycol, polyurethane, glycerin carbonate, urea, oxazolone and other important intermediates, spinning liquid on textiles, acid gas remover and concrete additive, plastic foaming agent and synthetic lubricating oil stabilizer ; It can be used as pharmaceutical raw materials in medicine; in the capacitor battery industry, the mixed solution of ethylene carbonate and pr...

Claims

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Application Information

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IPC IPC(8): C07D317/38B01D9/02
CPCB01D9/0013B01D9/005B01D9/0063C07D317/38B01D2009/0086
Inventor 许兆石李守芬张军陈明明庄昊徐东李洋
Owner LIAONING GANGLONG CHEM
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