Epoxypropane purifying method

A technology of propylene oxide and purification method, applied in the direction of organic chemistry and the like, can solve the problems of low yield of propylene oxide and large loss of extractant, and achieve the effect of high extraction efficiency and good technical effect.

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that propylene oxide and extractant are entrained in the overhead stream of the extra

Method used

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Examples

Experimental program
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Example Embodiment

[0047] [Example 1]

[0048] The crude propylene oxide solution (stream 1) and the solvent recovery tower kettle liquid (stream 5) exchange heat to 80℃ and enter the extractive distillation tower T-101. The extractive distillation tower uses n-octane as the extractant. The flow rate ratio of reagent stream 6 to crude propylene oxide solution feed 1) is 4, and deionized water (stream 12) is sprayed into the gas phase at the top of the tower. After condensation, the oil-water separation operation is carried out in the top phase separator D-101. There are multi-layer partitions in the phaser, and the separated oil layer (stream 8) and the recovered extractant (stream 6) are mixed as the reflux of the extractive distillation column (stream 13), and the separated water layer (stream 9) enters the washing tower T -103, the theoretical plate number of T101 tower is 70, the operating pressure is controlled at 200kPa, the temperature of the tower bottom is 100°C, and the composition of the...

Example Embodiment

[0059] [Example 2]

[0060] The crude propylene oxide solution (stream 1) and the solvent recovery tower kettle liquid (stream 3) exchange heat to 70°C and enter the extractive distillation tower T-101. The extractive distillation tower uses n-heptane as the extractant. The flow rate ratio of reagent stream 6 to crude propylene oxide solution feed 1) is 5:1, and medium-pressure steam (stream 12) is sprayed into the gas phase at the top of the tower. After condensation, the oil-water separation operation is carried out in the top phase separator D-101 , There are multiple baffles in the phase separator, the separated oil layer (stream 8) and the recovered extractant (stream 6) are mixed as the reflux of the extractive distillation column (stream 13), and the separated water layer (stream 9) enters the water washing Column T-103, T101 column has 75 theoretical plates, operating pressure is controlled at 200kPa, tower bottom temperature is 95°C, and the composition of crude propylen...

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Abstract

The invention relates to an epoxypropane purifying method. The problems of low epoxypropane yield and large extractant loss due to the entrainment of epoxypropane and an extractant in the material flow from the top of an extraction distillation tower in the prior art are mainly solved. The method comprises the following steps: 1, a crude epoxypropane solution enters the extraction distillation tower to obtain a material flow 2 at the tower top and a material flow 3 at the tower bottom; 2, the material flow 3 enters a solvent recovery tower to obtain an epoxypropane product at the tower top and an extractant flow 5 at the tower bottom, and the flow 5 is divided into a flow 6 and a flow 7; 3, the material flow 2 is condensed, and the condensed flow 2 enters a phase splitter and undergoes oil and water separation to obtain an oil layer 8 and a water layer 9; 4, the oil layer 8 and the flow 6 return to the top of the extraction distillation tower; and 5, the flow 7 enters the lower portion of a water washing tower and the water layer 9 enters the upper portion of the water washing tower to obtain wastewater flow at the tower bottom and a flow 11 at the tower top, and the flow 11 enters the phase splitter. The method well solves the problems and can be used in the industrial production of epoxypropane purification.

Description

technical field [0001] The present invention relates to a kind of propylene oxide purification method, more specifically, the present invention mainly relates to the propylene oxide purification method that contains water, acetaldehyde, methyl alcohol and methyl formate as impurity. Background technique [0002] Propylene oxide is an important organic compound raw material and the third largest propylene derivative after polypropylene and acrylonitrile. Cumene hydroperoxide (CHP) and ethylbenzene hydroperoxide (EBHP) react with propylene to obtain propylene oxide in the presence of an epoxidation catalyst. In addition to propylene oxide, the target product also generates water , methanol, acetaldehyde, methyl formate and other oxygen-containing compounds. In order to obtain high-purity propylene oxide that meets the requirements of polymerization, the impurities contained in propylene oxide must be separated and removed. Because the relative volatility of methyl formate an...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/32
CPCC07D301/32C07D303/04
Inventor 杨卫胜胡松李木金
Owner CHINA PETROLEUM & CHEM CORP
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