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Method for preparing amyl alcohol by utilizing n-valeraldehyde

A technology of n-valeraldehyde and pentanol, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems such as the inability to meet the requirements of industrialized batch production of isovaleraldehyde, the easy pulverization of catalysts, and the difficulty in regeneration. , to achieve the effect of ensuring conversion rate and purity, high safety and less pollution

Inactive Publication Date: 2016-08-24
SHANDONG CHENGTAI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The hydrogenation of n-valeraldehyde is a main method for preparing pentanol. The conversion rate of the existing preparation method is only 80-90%, and the purity can only reach 96%. At the same time, there are high energy consumption, and the catalyst is easy to pulverize at high temperature. , coking, difficult regeneration and other shortcomings, still can not meet the requirements of industrial mass production of isovaleraldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment, a kind of method utilizing n-valeraldehyde to prepare pentanol comprises the steps:

[0019] 1) Add n-valeraldehyde and hydrogenation catalyst into the autoclave and seal it well;

[0020] 2) After replacing 5 times with 1-2MPa hydrogen, fill the kettle with 5 MPa hydrogen, heat it to 200 ℃ and keep it warm for 4 hours. After the reaction, lower the temperature, release the pressure, open the kettle, filter, and take the upper organic phase , to get semi-finished pentanol;

[0021] 3) Take semi-finished amyl alcohol and add sodium hydroxide to it, shake, stand still and separate layers, discard the water layer, filter the organic layer, and keep the filtrate;

[0022] 4) Pass the filtrate obtained in step 3) into an adsorbent column filled with alumina for adsorption treatment;

[0023] 5) In the step 4), the filtrate flows through the adsorbent column equipped with modified activated carbon at a rate of 0.5-30 column volume / hour;

[0024] 6) Carry out re...

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Abstract

The invention discloses a method for preparing amyl alcohol by utilizing n-valeraldehyde. The method comprises the following steps: 1) adding n-valeraldehyde and a hydrogenation catalyst into a high-pressure kettle, filling and sealing; 2) replacing for five years by use of 1-2MPa hydrogen gas, charging 5 MPa hydrogen gas into the kettle, heating to 200 DEG C, preserving the heat to react for 4 hours, cooling, releasing pressure, opening the kettle and filtering after the reaction is ended, getting upper-layer organic phase, thereby obtaining a semi-finished product amyl alcohol; 3) adding sodium hydroxide into the semi-finished product amyl alcohol, shaking, stewing and layering, discarding a water layer, filtering an organic layer, and keeping filtrate; and 4) introducing the filtrate obtained in the step 3) into an adsorbent column with aluminum oxide to carry out adsorption treatment. According to the technical scheme adopted by the invention, a n-valeraldehyde conversion rate can be up to 99.8%, the purity of the obtained amyl alcohol can be up to 99.99%, the energy consumption is low, the manufacturing cost can be reduced, corrosion on equipment is avoided, the pollution is less and the safety is high on the premise of guaranteeing a conversion rate and purity.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing amyl alcohol by utilizing n-valeraldehyde. Background technique [0002] N-valeraldehyde is a colorless liquid, also known as valeraldehyde, slightly soluble in water, soluble in ethanol and ether, and belongs to flammable products. It is mainly used to hydrogenate pentanol and oxidize valeric acid. It is also used as a spice. Organic synthesis intermediate, rubber accelerator. [0003] The hydrogenation of n-valeraldehyde is a main method for preparing pentanol. The conversion rate of the existing preparation method is only 80-90%, and the purity can only reach 96%. At the same time, there are high energy consumption, and the catalyst is easy to pulverize at high temperature. , coking, difficult regeneration and other shortcomings, still can not meet the industrialized mass production requirements of isovaleraldehyde. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/141B01J29/80
CPCC07C29/141B01J29/48B01J29/7815B01J29/80B01J2229/20C07C31/125
Inventor 张国华王纪伟
Owner SHANDONG CHENGTAI CHEM IND
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