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Process for producing alpha-phenylethyl alcohol

A technology for phenethyl alcohol and acetophenone is applied in the field of producing α-phenethyl alcohol when the temperature exceeds 150°C, and achieves the effects of high selectivity and superior industrial production.

Inactive Publication Date: 2003-04-23
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a method for producing α-phenylethanol by hydrogenating acetophenone with high selectivity and high efficiency using a fixed bed is unknown

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]Add copper-silica spherical catalyst (1 liter) (containing 63% (weight) CuO, 1.5mm×4mmL) into a fixed-bed adiabatic reactor. The reactor is a vertically fixed tube (with an inner diameter of 4.1cm catalyst The length of the bed is 78cm). Then, will contain 56% (weight) acetophenone (hereinafter referred to as "ACP"), 16% (weight) α-phenylethanol (hereinafter referred to as "MBA"), 0.04% (weight) ethylbenzene (hereinafter referred to as " EB” represents) and 28% (weight) of the raw material liquid of other compounds, at a rate of 11 / hr, the mixed gas (standard state) composed of 84% (volume) hydrogen and 16% (volume) methane is adjusted to 0.3Nm 3 / hr rate, added to the reactor in an upward flow mode (the molar amount of hydrogen is 2.4 times the molar amount of raw material acetophenone), and then at 24kg / cm 2 The hydrogenation reaction is carried out at G. In this step, part of the hydrogenation reaction liquid at the outlet of the reactor is recycled to the inlet of the r...

Embodiment 2

[0025] The experiment was performed in the same manner as in Example 1, except that the raw material liquid and hydrogen were fed into the reactor through a downward flow, and the liquid retention ratio was set at 35%. The inlet and outlet temperatures of the reactor at steady state were measured to be 109°C and 118°C, respectively. The reaction results measured from the composition of the reactor inlet and outlet are as follows: ACP conversion ratio is 94%, and EB selectivity ratio is 1.8%.

Embodiment 3

[0027] The experiment was carried out in the same way as in Example 1, except that the catalyst volume was 21 (the height of the catalyst bed was 148cm), and it would contain 46% by weight ACP, 20% by weight MBA, and 34% by weight. The raw material liquid of other compounds is used at a rate of 21 / hr, and the mixed gas composed of 84% (volume) hydrogen and 16% (volume) methane is adjusted to 1.8Nm 3 / hr rate into the reactor. The inlet temperature was controlled at 84°C and the outlet temperature was 119°C. The reaction results measured from the composition of the reactor inlet and outlet are as follows: ACP conversion ratio is 96%, and EB selectivity ratio is 1.7%. Comparative example 1

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Abstract

A process for producing alpha -phenylethyl alcohol, which comprises hydrogenating acetophenone by a fixed bed flow reaction in the presence of a catalyst, wherein the reaction is conducted in the state where the liquid hold up ratio in a reactor is in the range of from 30% to 90%.

Description

Background of the invention [0001] The present invention relates to a method for producing α-phenylethanol. More specifically, in this method, acetophenone is hydrogenated through a fixed-bed flow reaction in the presence of a catalyst, and the output of the by-product ethylbenzene during the reaction is controlled at a sufficiently low level, so that the The selectivity is high, therefore, this method is very superior in industrial production. [0002] α-Phenylethanol can be used as a raw material for the production of styrene and various spices, for example. It is known to produce α-phenethyl alcohol by hydrogenating acetophenone. For example, Japanese Patent Publication No. 59-27216 discloses a method of hydrogenating acetophenone using a copper-chromite catalyst containing barium, zinc, and magnesium. However, a method for producing α-phenethyl alcohol by hydrogenating acetophenone with high selectivity and high efficiency using a fixed bed is unknown. Summary of the inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/145
CPCC07C29/145C07C33/22
Inventor 奥宪章石野胜
Owner SUMITOMO CHEM CO LTD