Refining method and device for high-purity DMC (dimethyl carbonate)

A technology of dimethyl carbonate and a refining method, applied in the refining field of high-purity dimethyl carbonate, can solve the problems of large equipment investment, complicated process, poor quality of dimethyl carbonate, etc., and achieves a high degree of automation, a separation method and Simple process and good yield

Inactive Publication Date: 2016-03-16
TONGLING JINTAI CHEM INDAL
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Problems solved by technology

From the description of the patent, it can be seen that the patent process is complicated, the equipment investment is large, and the quality of the produced dimethyl carbonate is poor

Method used

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  • Refining method and device for high-purity DMC (dimethyl carbonate)

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Embodiment Construction

[0015] In this specific embodiment, the feed inlet of the raw material is selected on the horizontal kettle 2, and the packing layer 7 is divided into seven sections, and the height of each section of packing is 3 meters. Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0016] Step 1, feeding and steaming operation: continuously inject industrial-grade dimethyl carbonate with a purity of 99.5% into the horizontal kettle 2 with a material pump, and adjust the feeding when the liquid level gauge 4 of the horizontal kettle 2 shows 50cm The flow rate of port 1 is 790kg / h. At this time, open the steam valve of the built-in U-shaped tube bundle heat exchanger 3, add steam, control the steam pressure to 0.20Mpa, maintain total reflux in the tower and maintain the pressure in the tower at normal pressure . The specific method is to open the vent port of the secondary condensation gas-liquid separator 6 and ...

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Abstract

The invention discloses a refining method and device for high-purity DMC (dimethyl carbonate). The method comprises three steps including feeding and steam adding operation, light component collection operation and product collection. The adopted refining device comprises a horizontal retort, a rectifying tower and a secondary plate condenser, wherein the rectifying tower is filled with neat stainless steel wire mesh corrugated packing, the condenser is arranged in the tower top, a packing layer is divided into 5-8 sections, each section of the packing is 2-3.5 m high, and a liquid distributor and a liquid collector are arranged between every two sections of the packing; a charging port is arranged above the horizontal retort or at the upper part of the first section of the packing of the rectifying tower. With the adoption of the refining method and device, single-tower continuous operation is realized, the separation technology is simple, the yield is high, operation is safe and environment-friendly, energy consumption is low, and the automation degree is high.

Description

technical field [0001] The invention relates to a method and equipment for refining high-purity dimethyl carbonate, belonging to the field of fine chemicals. Background technique [0002] Dimethyl Carbonate (DimethylCarbnonate, DMC for short) is a colorless, transparent, slightly odorous, slightly sweet liquid at room temperature, with a melting point of 4°C, a boiling point of 90.1°C, and a density of 1.069g / cm3. It is hardly soluble in water, but it can be mixed with Almost all organic solvents such as alcohols, ethers, and ketones are miscible, and are environmentally friendly chemical products that have attracted widespread attention at home and abroad in recent years. It is an excellent solvent, its main features are narrow range of melting point and boiling point, high surface tension, low viscosity, small dielectric constant, good anti-static effect, low heat of evaporation, fast relative evaporation speed, and Quick-drying, good compatibility with other substances, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/08C07C69/96
CPCC07C68/08C07C69/96
Inventor 方诒胜李阳胡童亮查诺明祖箫霄徐利林
Owner TONGLING JINTAI CHEM INDAL
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