Purifying method for 1,2-epoxybutane

A technology of butylene oxide and purification method, which is applied in the direction of organic chemistry, can solve the problems of low yield and large loss of extractant, and achieve the effect of high separation efficiency and low equipment investment

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

[0008] The technical problem to be solved by the present invention is that 1,2-epoxybutane and extractant are entrained in the overhead stream of the extractive distillation tower in the prior art, resulting in low yield of 1,2-epoxybutane and large loss of extractant problem, to provide a new 1,2-epoxybutane purification method

Method used

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  • Purifying method for 1,2-epoxybutane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] The crude 1,2-epoxybutane solution is calculated by mass percentage, 93.5% of 1,2-epoxybutane, 5% of water, and the rest are impurities of propionaldehyde, methanol and methyl formate.

[0045] Using the extractive distillation column T101, the crude 1,2-epoxybutane solution 1 containing impurities is supplied to C 7 ~C 12 In the extractive distillation where hydrocarbons are used as the extractant; medium-pressure steam or deionized water 3 is sprayed into the overhead gas 2 of the extractive distillation tower T101, and the condensate 4 is separated into an oil layer 6 and a water layer 5 in the phase separator D101, The oil layer 6 and the recovery extractant 12 are circulated to the extractive distillation tower T101 as the extractant and also as reflux 7; the liquid 11 of the extractive distillation tower T101 enters the solvent recovery tower T102, and after separation, 1,2-epoxybutane is obtained at the top of the tower Product 13, solvent recovery tower liquid ...

Embodiment 2

[0054] The crude 1,2-epoxybutane solution is expressed in mass percent, 94.5% of 1,2-epoxybutane, 4% of water, and the rest are impurities of propionaldehyde, methanol and methyl formate.

[0055] The implementation mode is the same as [Example 1], the difference is:

[0056] The theoretical plate number of the extractive distillation column is 45, the operating pressure is 160kPa, and the operating temperature is 78°C.

[0057] The solvent ratio of the extractive distillation column was 5.

[0058] The theoretical plate number of the solvent recovery tower is 35, the operating pressure is 160kPa, and the operating temperature is 80°C.

[0059] The operating pressure of the liquid-liquid separator is 130kPa, and the operating temperature is 40°C.

[0060] Extractant A is isooctane.

[0061] The weight ratio of stream I to stream II is 600:1.

[0062] In terms of mass percentage, the purity of 1,2-butylene oxide in stream 13 reaches 99.96%, propionaldehyde is 10ppm, and n-o...

Embodiment 3

[0064] The crude 1,2-epoxybutane solution is expressed in mass percent, 96% of 1,2-epoxybutane, 2% of water, and the rest are impurities of propionaldehyde, methanol and methyl formate.

[0065] The implementation mode is the same as [Example 1], the difference is:

[0066] The theoretical plate number of the extractive distillation tower is 60, the operating pressure is 200kPa, and the operating temperature is 85°C.

[0067] The solvent ratio of the extractive distillation column is 4.

[0068] The theoretical plate number of the solvent recovery tower is 40, the operating pressure is 200kPa, and the operating temperature is 90°C.

[0069] The operating pressure of the liquid-liquid separator is 160kPa, and the operating temperature is 45°C.

[0070] Extractant A is 2-methylpentane.

[0071] The weight ratio of stream I to stream II is 650:1.

[0072] In terms of mass percentage, the 1,2-epoxybutane product in stream 13 has a purity of 99.98%, 5 ppm of propionaldehyde, an...

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Abstract

The invention relates to a purifying method for 1,2-epoxybutane. The purifying method mainly overcomes the problems of low yield of 1,2-epoxybutane, great loss of extractant and high waste water treatment cost since waste water of an extraction distillation column carries 1,2-epoxybutane and the extractant in the prior art. According to the invention, a liquid-liquid separator is additionally arranged and the extractant is used for treating and recovering 1,2-epoxybutane in waste water, so the above problems are overcome; and the purifying method provided by the invention can be applied to industrial production of 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 used in the manufacture of intermediates and polymers, such as the production of 1,2-butanediol, and is also used to replace Acetone acts as a thinner for nitro lacquer. 1,2-butylene oxide can also be used as a standard substance for chromatographic analysis, and can also be used to make foam plastics, synthetic rubber, and non-ionic surfactants. 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 propionaldehyde, methyl formate and ...

Claims

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Application Information

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