A kind of preparation technology of 2-ethylhexenal and 2-ethylhexanol

A preparation technology of ethylhexenal and 2-ethylhexenal, which is applied in the field of preparation technology of 2-ethylhexenal and 2-ethylhexanol, can solve problems such as side reactions, complicated process, and large energy consumption, and achieve the goal of reaction The process is mild, the process is simplified, and the effect of increasing the alkali concentration

Active Publication Date: 2011-11-30
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, in the three reaction loops of the n-butyraldehyde condensation part, the first loop is passed into fresh alkaline catalyst aqueous solution, and in the first loop, the condensation reaction intensity is larger, the reaction is faster, and it is easier to generate polybutyraldehyde, polybutyraldehyde, Byproducts such as 2-ethyl-4-methylpentenal; secondly, the alkali concentration of the fresh alkaline catalyst aqueous solution is usually controlled as 2%, if the concentration of the fr

Method used

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  • A kind of preparation technology of 2-ethylhexenal and 2-ethylhexanol
  • A kind of preparation technology of 2-ethylhexenal and 2-ethylhexanol
  • A kind of preparation technology of 2-ethylhexenal and 2-ethylhexanol

Examples

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Example Embodiment

[0040] Example 1:

[0041] Such as image 3 As shown, a system for preparing 2-ethylhexenal provided by the present invention includes a first reactor 311, a second reactor 312, a first chromatograph 331, and a second chromatograph 332; The outlet of the first reactor 311 and the inlet of the first chromatograph 331 are connected by a heat exchanger 361 through a pipeline; the lower outlet of the first chromatograph 331 communicates with the outside through an alkaline liquid circulation pump 321, the first chromatograph The upper outlet of 331 is connected to the inlet of the second reactor 312 through a pipeline; the lye inlet of the second reactor 312 is connected to the lye tank 38 through a lye supply pump 35 through a pipeline, and the outlet of the second reactor 312 is connected to the second The inlet of the chromatograph 332 is connected by a pipeline through a heat exchanger 362; the lower outlet of the second chromatograph 332 and the lye inlet of the first reactor 3...

Example Embodiment

[0045] Example 2:

[0046] See attached for process flow image 3 , 100ml / min of fresh raw material containing 99.8wt% n-butyraldehyde, and 31.2ml / min of the alkaline catalyst aqueous solution from the lye circulation pump 322 enter the first condensation reactor 311, mix and react, the reaction temperature is 80°C, With a residence time of 15 minutes, the discharge from the first condensation reactor 311 is cooled to 40°C by the cooler 361, and then sent to the chromatograph 331 for stratification. The lower layer of dilute lye is sent to the lye tank or discharged by the lye pump as required After reprocessing, the upper layer of the mixed liquid of butyraldehyde and octenal (2-ethylhexenal content 56.4wt%) was sent to the second condensation reactor 312 at 85ml / min, and 47ml from the lye supply pump 5 After mixing 2wt% lye per min, further reaction occurs. The reaction temperature is 120℃, and the residence time is 10min. The discharge from the second condensation reactor 312...

Example Embodiment

[0047] Example 3:

[0048] The process flow and reaction conditions are the same as in Example 2, except that the raw materials are fresh 99wt% n-butyraldehyde and 1wt% isobutyraldehyde. After the first condensation reactor 311 completes the reaction, it is stratified by the chromatograph 331, and the upper layer of the mixed liquid of butyraldehyde and octenal (the content of 2-ethylhexenal is 53.1wt%) is reacted by the second condensation reactor 322 , Separated by the chromatograph 332, the upper layer solution is 96.4wt% 2-ethylhexenal and 0.7% polybutyraldehyde, 0.17% of 2-ethyl-4-methylpentenal and unreacted n-butyraldehyde 1% and other impurities. After hydrogenation and rectification, the final product of 2-ethylhexanol with a purity of ≥99.6% is obtained. The main impurities of the product are 2-ethyl-4-methylpentanol 0.14%, water 0.12%, 2-ethylhexanol Aldehyde 0.05%.

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Abstract

The invention provides a preparation process of 2-ethyl-hexenal and 2-ethyl hexanol. The preparation process comprises the following steps: carrying out condensation reaction and dehydration reaction on butyraldehyde used as a raw material under the catalysis action of an alkaline catalyst in a first reactor and a second reactor which are connected in series, thus generating 2-ethyl hexenal, wherein the raw material butyraldehyde contacts the alkaline catalyst aqueous solution in the reactors in a counter-flow mode, and the fresh alkaline catalyst aqueous solution is added into the second reactor. In the process provided by the invention, the reaction occurring in the reactors is milder and has less possibility to generate by-products, therefore the raw material butyraldehyde for the condensation reaction can be directly introduced into an aldehyde condensation section for the condensation reaction as long as the content of n-butyraldehyde in the raw material butyraldehyde is not less than 90wt%; and furthermore, the alkali concentration of the fresh alkaline catalyst is improved, and the emission of the alkaline wastewater is reduced. In addition, crude 2-ethyl hexenal products containing a small amount of impurities, prepared by the preparation process, can be introduced into hydrogenation and rectification sections to prepare 2-ethyl hexanol products.

Description

technical field [0001] The invention relates to a preparation process of 2-ethylhexenal and 2-ethylhexanol, which belongs to the technical field of chemical industry. Background technique [0002] 2-Ethylhexanol (commonly known as octanol) is a colorless oily liquid with luster and fruity aroma. It has the largest output in oxo synthesis, accounting for more than half of the total oxo alcohol. 2-Ethylhexanol is mainly used in the production of the plasticizer dioctyl phthalate in the plastic industry and as a plasticizer for polyvinyl chloride resin. It has a good compatibility with most synthetic resins and rubbers used in industry. Solvent effect, high plasticizing efficiency, low volatility, good low temperature softness, good heat resistance and corrosion resistance. 2-Ethylhexanol is also used as a raw material for synthetic lubricants and antioxidants. It is also a solvent and a defoamer with good performance. It can be used in paper pulp sizing, photography, paint, ...

Claims

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Application Information

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IPC IPC(8): C07C47/21C07C45/72C07C31/125C07C29/141C07C29/17
Inventor 张佶璘蒋文陈建伟
Owner SHANGHAI HUAYI ENERGY CHEM
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