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Citral liquid-phase hydrogenation method for synthesizing unsaturated alcohols
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A liquid-phase hydrogenation, citral technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of low selectivity of unsaturated alcohols, and achieve the effects of simple operation and simple process
Inactive Publication Date: 2010-06-23
FUDAN UNIV +1
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[0004] Oxide carriers commonly used in citral selective hydrogenation catalysts are SiO 2 、Al 2 o 3 and TiO 2 etc., but the selectivity of these carrier-supported catalysts for unsaturated alcohols is low, and the main products are citronellal and citronellol
Method used
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[0024] (2) At 80°C, by adding K 2 CO 3 solution, magnetically stirred for 2 hours, the catalytically active components were simultaneously precipitated, and left standing overnight;
[0025] (3) Suction filter the reaction solution obtained in (2), wash the filter residue, and dry at 80°C.
[0026] (4) Calcining the powder obtained in (3) in an air atmosphere at 400°C for 2h, that is, to obtain 5% loading of Pt / Fe 2 o 3 .
[0029] (2) At 80°C, by adding K 2 CO 3 solution, magnetically stirred for 2 hours, the catalytically active components were simultaneously precipitated, and left standing overnight;
[0030] (3) Suction filter the reaction solution obtained in (2), wash the filter residue, and dry at 80°C.
[0031] (4) Calcining the powder obtained in (3) in an air atmosphere at 400°C for 2 hours, that is, to obtain 10% loading of Pt / Fe 2 o 3 .
[0034] (2) At 80°C, by adding K 2 CO 3 solution, magnetically stirred for 2 hours, the catalytically active components were simultaneously precipitated, and left standing overnight;
[0035] (3) Suction filter the reaction solution obtained in (2), wash the filter residue, and dry at 80°C.
[0036] (4) Calcining the powder obtained in (3) in an air atmosphere at 400 ° C for 2 hours, that is, to obtain a Pt / Fe with a loading capacity of 15% 2 o 3 .
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Abstract
The invention belongs to the technical field of chemical industry, and relates to a citral liquid-phase hydrogenation method for synthesizing unsaturated alcohol. The method comprises the following steps: using a platinum catalyst loaded on ferricoxide as the catalyst for synthesizing the unsaturated alcohols in a citral optional hydrogenation way, adding the citral and the catalyst in mass ratio into normal hexane, and carrying out the reaction in an FCZ-1 magnetic high-pressure reaction kettle. The optionality of the prepared catalyst for catalyzing generation of unsaturated alcohols is better than that of the traditional loaded platinum catalyst. The invention is simple to operate, the citral liquid-phase hydrogenation is completed in one step, and thus, the technique is simple. The invention realizes optional regular regulation and control on geraniol and nerol. As the content of Pt gradually increases, the optionality of the nerol is obviously increased, and the optionality of the geraniol is gradually decreased.
Description
technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and relates to a method for synthesizing unsaturated alcohol by liquid-phase hydrogenation of citral, in particular to the preparation of iron oxide-loaded platinum catalyst and its application in selective liquid-phase hydrogenation of citral. Background technique [0002] Citral is a typical α, β-unsaturated aldehyde, which has important application value in industries such as spices and pharmaceutical intermediates. Its selective hydrogenation products unsaturated alcohols-nerol and geraniol (cis / trans -3,7-dimethyl-2,6-octadien-1-ol) are two kinds of precious spices and pharmaceutical intermediates, which have wide application value in flavor, medicine and other industries. Therefore, in recent years, citral The research on the selective hydrogenation of unsaturated alcohols is extensive. [0003] The prior art discloses that the catalyst active components for the ...
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