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Technical method for separating butyraldehyde, ethanol and water mixture

A process method and mixture technology, which are applied in the fields of water mixture, separation of ternary mixed system, separation of butyraldehyde and ethanol, can solve the problems of complex separation, many by-products, troublesome separation of substances, etc., and achieve good separation effect and simple operation. Effect

Active Publication Date: 2017-08-04
烟台国邦化工机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Butyraldehyde is soluble in ethanol, slightly soluble in water, and water and ethanol are miscible. It is more complicated to obtain a high-purity isolate
For the separation of butyraldehyde and ethanol, the rectification method is adopted in the laboratory. If the ethanol content in the raw material is not much, it is easy to take away the ethanol through azeotropy, and it is easy to oxidize, and there are many by-products
Separation of these two substances is cumbersome in the laboratory

Method used

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  • Technical method for separating butyraldehyde, ethanol and water mixture
  • Technical method for separating butyraldehyde, ethanol and water mixture
  • Technical method for separating butyraldehyde, ethanol and water mixture

Examples

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Embodiment 1

[0039] A process for separating butyraldehyde, ethanol, and water mixture, comprising a process for separating crude butyraldehyde, a process for separating ethanol, a washing process and a process for refining butyraldehyde, the steps of which are as follows:

[0040] (1) Process for separating crude butyraldehyde

[0041] Such as figure 1 As shown, the mixture raw material mainly containing ethanol, water, butyraldehyde is added to the butyraldehyde removal tower 1, then the process water extractant is added, and the material entering the butyraldehyde removal tower 1 rises to The top of the tower is condensed to a suitable temperature by the butyraldehyde removal tower primary condenser 7-1 and the butyraldehyde removal tower secondary condenser 7-2 at the top of the tower, and then enters the butyraldehyde removal tower reflux tank 17, and then flows back into the tower. The refluxed liquid and the rising steam carry out heat and mass transfer in the butyraldehyde removal...

Embodiment 2

[0049] On the basis of Example 1, but different from Example 1, in the process of separating ethanol, as Figure 4-6 Shown, the butyraldehyde removal tower 1 tower kettle material enters the first rectification tower 2 after being extracted, and the first rectification tower 2 tower kettle materials rise to the tower top after the first rectification tower reboiler 8 is heated, in the tower The top is condensed into liquid by the condenser 9 of the first rectification tower, and then enters the reflux tank 18 of the first rectification tower, and then flows back into the tower. The refluxed liquid and rising steam perform heat and mass transfer in the first rectification tower 2, After the first rectification tower 2 tower top sampling analysis is qualified, then extract a part of ethanol product and go to ethanol product buffer tank 10; The material in the bottom of the rectification tower 3 rises to the top of the tower after being heated by the second rectification tower re...

Embodiment 3

[0051] On the basis of Example 2, but different from Example 1, if the raw material contains hydrochloric acid, then the neutralization operation is carried out before the step (1), and the mixture raw material mainly containing ethanol, water, butyraldehyde After adding lye to the process water extractant for neutralization, it enters the butyraldehyde removal tower 1. Additionally, if Figure 7 As shown, the butyraldehyde removal tower 1 tower kettle is provided with the butyraldehyde removal tower coupling reboiler 14 to replace the butyraldehyde removal tower reboiler 6 in embodiment 1, and the butyraldehyde removal tower coupling reboiler 14 is also connected with The top of the first rectification tower 2, the steam at the top of the first rectification tower 2 enters the butyraldehyde removal tower coupling reboiler 14, and is condensed into liquid after heat exchange with the butyraldehyde removal tower 1 bottom material and returns to the first rectification tower Th...

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Abstract

The invention discloses a technical method for separating butyraldehyde, ethanol and water mixture. The method includes a butyraldehyde crude product separating technique, an ethanol separating technique, a water washing technique and a butyraldehyde refining technique. According to the technical scheme, a four-tower continuous rectification technique is adopted, wherein the enriched butyraldehyde is removed from a tower roof of a butyraldehyde removing tower; over 95% of ethanol product can be obtained at the roofs of a first rectification tower and a second rectification tower; a water washing tower is a fluid extraction tower, and the butyraldehyde crude product is obtained at the tower roof; the butyraldehyde crude product enters a third rectification tower to refine, and the butyraldehyde product is obtained. The whole continuous process is simple in operation, safe and controllable, good in separating effect, and suitable for industrial production; besides, a reverse three-effect rectification technique is also adopted according to the technical scheme; the steam at the first rectification tower roof is used as a hot source of a coupling reboiler of the butyraldehyde tower, and the steam at the second rectification tower roof is used as a hot source of a coupling reboiler of the first rectification tower. The steam usage and circular water usage are both reduced, the running cost is also reduced, the method is economical and environmentally friendly.

Description

technical field [0001] The invention relates to a method for separating a ternary mixed system, in particular to a process for separating a mixture of butyraldehyde, ethanol and water, and belongs to the technical field of chemical separation. Background technique [0002] Butyraldehyde and its derivatives are important organic chemical raw materials and fine chemical raw materials, and are widely used in the fields of plastic industry, agriculture, medicine, food, and feed. In the process of preparing butyraldehyde and its derivatives from ethanol, a mixture of butyraldehyde containing ethanol and water is often obtained, which requires purification of butyraldehyde and recovery of ethanol for reuse. The physical properties of ethanol, butyraldehyde and water are as follows: [0003] [0004] The properties of the azeotrope of ethanol, butyraldehyde, and water are as follows: [0005] [0006] Butyraldehyde is soluble in ethanol, slightly soluble in water, and water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/82C07C47/02C07C29/80C07C31/08
CPCC07C29/80C07C45/82C07C47/02C07C31/08
Inventor 张春灵李小刚毛学峰于秀刚李晓宁
Owner 烟台国邦化工机械科技有限公司
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