Fixed bed catalyst for preparing linalool by selective hydrogenation of dehydrolinalool

Abstract

The invention relates to a fixed bed catalyst for preparing linalool by selective hydrogenation of dehydrolinalool, wherein the catalyst is a supported catalyst, the carrier is granular Al2O3, the particle size is 3-5 mm, the active components comprise metals of Pd, Pb and Bi. The preparation process for the catalyst comprises that: the active components of the metal Pd, the metal Pb and the metal Bi are supported on the carrier by an impregnation method and high temperature baking to obtain a catalyst precursor; disodium ethylenediaminetetraacetate is absorbed on the catalyst precursor by the impregnation method, wherein the adsorption weight ratio of the disodium ethylenediaminetetraacetate to the catalyst precursor is controlled to 1000:(3-15); the catalyst precursor is subjected to a reduction activation treatment at a temperature of 200-250 DEG C in hydrogen to obtain the catalyst finished product. According to the present invention, the preparation method for the catalyst is convenient; the preparation cost is low; no other measures for inhibiting the deep hydrogenation adverse reaction are required; the conversion rate and the product selectivity can achieve the ideal levels; the space-time yield is significantly improved.

Description

Technical field [0001] The present invention relates to a fixed bed catalyst for selective hydrogenation of acetylenic bond-containing compounds to prepare corresponding olefinic bond-containing compounds, in particular to a carrier made of Al 2 O 3 The active components include metal Pd, Pb and Bi as a supported fixed-bed catalyst for the selective hydrogenation of dehydrolinalool to linalool. Background technique [0002] Linalool has high economic value. It can be used as a raw material for the preparation of high-grade spices or essences, and it is also an important intermediate for the synthesis of vitamin E and vitamin A. The preparation of linalool from the separation products of petroleum C5 fractions via 6-methyl-5-hepten-2-one and dehydrolinalool is an important process route for the artificial synthesis of linalool. The main and side reactions of dehydrolinalool to linalool by selective hydrogenation are shown in the following formula I and formula II. Since the side ...

AI Technical Summary

Problems solved by technology

However, the fixed-bed catalyst bed formed by such a material and a carrier with such a structural shape obviously cannot obtain an ideal catalyst load, which directly affects the space-time yield. For the technical solution disclosed in the above-mentioned Chinese patent 96110670.0, the space-time yield is only 0.31hr -1

Increasing the reaction residence time seems to be able to properly compensate for this defect. For example, the technical solution disclosed in the above-mentioned Chinese patent 00131057.7 adopts a two-stage series connection method to complete the entire hydrogenation process, and the space-time yield reaches 1.01hr. -1 However, this obviously leads to a great increase in the complexity of the production equipment and operation process

In addition, adding a certain amount of CO to hydrogen to inhibit the occurrence of deep hydrogenation and ensure the long-term stability of catalyst performance also has obvious defects, which further increases the complexity of production equipment and operating processes.

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