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Purifying method for 1,2-epoxybutane

A technology of butylene oxide and butyraldehyde, which is applied in the field of purifying 1,2-butylene oxide, and can solve problems such as product loss

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical reaction treatments are generally less useful because some undesired reactions occur with associated product losses

Method used

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  • Purifying method for 1,2-epoxybutane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The crude 1,2-epoxybutane solution 1 containing 1,2-epoxybutane and water, butyraldehyde, propionaldehyde, methanol, and acetone impurities enters the middle and lower part of the weight removal tower 100, and the extractant dimethyl sulfoxide is extracted from The upper part of the light removal tower enters, and after separation by extraction and rectification, a stream 4 containing water, butyraldehyde and methanol is obtained in the tower reactor, and a stream 3 at the top of the tower goes to the light removal tower 200 .

[0029] The still liquid 4 of the weight-removing tower enters the extractant recovery tower 400 to recover the extractant dimethyl sulfoxide, and circulates to the weight-removing tower 100 as the extractant.

[0030] The overhead stream 3 of the de-lightening tower enters the middle and lower part of the light-removing tower 200, and isooctane enters from a position close to the top of the de-lightening tower. - stream 5 of butylene oxide.

[...

Embodiment 2

[0041]The composition of crude 1,2-butylene oxide solution 1: 94% of 1,2-butylene oxide, 3% of water, and the rest are impurities of butyraldehyde, propionaldehyde, methanol, acetone and methyl formate.

[0042] The embodiment is the same as [Example 1], except that the extractant B is a mixture of n-octane and isooctane.

[0043] The theoretical plate number of the weight removal tower is 50, the operating temperature is 85°C, the operating pressure is 180kPa, and the reflux ratio is 1.5.

[0044] The solvent ratio (mass ratio of extractant dimethyl sulfoxide to crude 1,2-epoxybutane feed flow) of the weight-removing tower is 5:1.

[0045] The theoretical plate number of the extraction agent recovery tower is 50, the operating pressure is 200kPa, the operating temperature is 90°C, and the reflux ratio is 12.

[0046] The theoretical plate number of the light removal tower is 50, the operating temperature is 75°C, the operating pressure is 180kPa, and the reflux ratio is 10. ...

Embodiment 3

[0051] The composition of crude 1,2-butylene oxide solution 1: 96% of 1,2-butylene oxide, 2% of water, and the rest are impurities of butyraldehyde, propionaldehyde, methanol, acetone and methyl formate.

[0052] The embodiment is the same as [Example 1], except that the extractant B is 2-methylheptane.

[0053] The theoretical plate number of the weight removal tower is 35, the operating temperature is 73°C, the operating pressure is 140kPa, and the reflux ratio is 3.

[0054] The solvent ratio (mass ratio of extractant A to crude 1,2-butylene oxide feed flow) of the weight-removing tower is 4:1.

[0055] The theoretical plate number of the extraction agent recovery tower is 35, the operating pressure is 150kPa, the operating temperature is 64°C, and the reflux ratio is 15.

[0056] The theoretical plate number of the light removal tower is 35, the operating temperature is 74°C, the operating pressure is 140kPa, and the reflux ratio is 25.

[0057] The solvent ratio of the ...

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Abstract

The invention relates to a purifying method for 1,2-epoxybutane. The method comprises the following steps: carrying out extraction and rectification to remove methanol, water and butyraldehyde with dimethyl sulfoxide as an extractant and then removing methyl formate, propionaldehyde and acetone with C7-20 hydrocarbons as an extractant so as to obtain 1,2-epoxybutane with purity as high as 99.9%. The purifying method provided by the invention can be applied to industrial purification of 1,2-epoxybutane.

Description

technical field [0001] The invention relates to a method for purifying 1,2-epoxybutane. Background technique [0002] 1,2-Butene oxide (BO), also known as butylene oxide, is an important organic synthesis raw material and organic synthesis intermediate, and has a wide range of uses. Industrially, the production of 1,2-epoxybutane by catalytic epoxidation of 1-butene (such as CHP method) with a clean process is gradually replacing the traditional chlorohydrin process. During the catalytic epoxidation of 1-butene to produce 1,2-epoxybutane, impurities such as water, aldehydes, alcohols, and esters are produced, such as methanol, water, and 1,2-epoxybutane to form an azeotrope, The relative volatility of acetone and 1,2-butylene oxide is close to 1, which makes it difficult to separate and purify 1,2-butylene oxide by ordinary distillation. However, only 1,2-epoxybutane with relatively high purity can be polymerized, so the crude product of 1,2-epoxybutane should be separated...

Claims

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Application Information

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