Epoxypropane refinement system and method

A technology of propylene oxide and refining system, applied in the direction of organic chemistry, etc., can solve the problem of not being able to obtain high-purity propylene oxide, and achieve the effects of high purity of propylene oxide product, improving separation efficiency, and reducing reflux ratio.

Inactive Publication Date: 2016-06-15
江苏道尔顿石化科技有限公司
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Problems solved by technology

The crude propylene oxide material obtained from the cumene hydroperoxide cyclization unit contains, in addition to propylene oxide, cumene, dimethyl benzyl alcohol, acetophenone, phenol, acetone, water, methanol, propylene glycol, Formaldehyde, methyl formate, formic acid and other impurities, due to multi-component azeotropy, the relative volatility ratio of single component and propylene oxide is close to 1, and high-purity propylene oxide cannot be obtained by conventional distillation technology. Therefore, advanced refining technology It is an important link to obtain high-end propylene oxide products

Method used

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  • Epoxypropane refinement system and method

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Embodiment 1

[0039] A propylene oxide refining system, such as figure 1 Shown, comprise extraction tower 1, extraction agent recovery tower 2 and propylene oxide rectification tower 3, the middle part of extraction tower 1 is provided with propylene oxide crude product raw material import, the top of extraction tower 1 is provided with extraction agent inlet, extraction tower 1 The bottom material outlet of the tower is connected to the middle material inlet of the extraction agent recovery tower 2 through the recovery tower feed pump 20, and the tower top material outlet of the extraction agent recovery tower 2 is connected to the middle material inlet of the propylene oxide rectification tower 3 through a pipeline Generally, the top of the propylene oxide rectifying tower 3 is provided with a high-purity propylene oxide material outlet.

[0040] In this particular embodiment, the extraction tower is also equipped with an extraction tower condenser 11 and a first stratifier 12, and the to...

Embodiment 2

[0047] A method for refining propylene oxide, using C6 n-hexane as an extraction agent to determine the required process parameters for the rectification system of the present invention, specifically comprises the following steps:

[0048] (1) Extraction and separation in the extraction tower

[0049] The crude propylene oxide from the propylene oxide cyclization unit at 96°C is sent to the middle of the extraction tower, and the extractant at 54°C is sent to the top of the extraction tower in a liquid phase state, and the mass ratio of crude propylene oxide to the extractant is controlled as 1:2.7, the top operating temperature of the extraction tower is controlled at 98°C, the operating temperature at the bottom of the tower is controlled at 120°C, the reflux ratio in the tower is controlled at 1:1.3, and the crude propylene oxide and the extractant are directly exchanged in the tower. The content of propylene oxide in the light components at the top of the tower is less tha...

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Abstract

The invention discloses an epoxypropane refinement system which comprises an extraction tower, an extractant recovery tower and an epoxypropane rectification tower, wherein the middle part of the extraction tower is provided with an epoxypropane crude product inlet; the top of the extraction tower is provided with an extractant inlet; a tower bottom material outlet of the extraction tower communicates with a middle part material inlet of the extractant recovery tower; a tower top material outlet of the extractant recovery tower communicates with a middle part material inlet of the epoxypropane rectification tower; and the tower top of the epoxypropane rectification tower is provided with a high-purity epoxypropane material outlet. The system has the advantages of high product purity, low consumption, short process, less equipment and low investment.

Description

technical field [0001] The invention relates to a propylene oxide refining system and a method thereof. Background technique [0002] Propylene oxide is mainly used in the production of polyether polyol, propylene glycol, polyurethane, degradable plastics, isopropanolamine, etc. It is also the main raw material of the fourth generation of nonionic surfactants, demulsifiers, plasticizers, flame retardants, lubricants, pesticide emulsifiers, etc. It is widely used in surfactants, food, tobacco, medicine and cosmetics and other industries. It is an important raw material for fine chemicals and has a broad market in the future. [0003] At present, the industrial production routes of propylene oxide in China mainly include chlorohydrin method, isobutane co-oxidation method, ethylbenzene co-oxidation method and hydrogen peroxide method. At present, the chlorohydrin method accounts for a high proportion in my country. The chlorohydrin method discharges 40-50 tons of saline organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/32
CPCC07D303/04C07D301/32
Inventor 叶子茂姜博文
Owner 江苏道尔顿石化科技有限公司
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