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Method for preparing isobutylaldehyde by performing selective hydrogenation on methylacrolein

A technology for the selective hydrogenation of methacrolein, applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, to achieve good stability, mild reaction conditions, and good selectivity

Inactive Publication Date: 2012-02-15
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing isobutyraldehyde by selective hydrogenation of methacrolein, the method adopts a supported Pd catalyst with Pd as the active component, the reaction conditions are mild, the catalyst activity is high, and the selectivity Good, has good stability, effectively solves various problems existing in the existing process, and provides a new and effective way for the synthesis of isobutyraldehyde

Method used

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  • Method for preparing isobutylaldehyde by performing selective hydrogenation on methylacrolein
  • Method for preparing isobutylaldehyde by performing selective hydrogenation on methylacrolein
  • Method for preparing isobutylaldehyde by performing selective hydrogenation on methylacrolein

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preparation example Construction

[0018] One, the preparation of catalyst:

[0019] Prepare a certain concentration of Pd-containing soluble brine solution, add it to the corresponding carrier for impregnation according to the metering ratio, and prepare the catalyst precursor, then dry it at 110 ° C for 12 hours, after high-temperature roasting, cool it down to room temperature, and put it into the reactor. Use hydrogen or hydrogen-nitrogen mixed gas at a pressure of 1.0MPa and a hydrogen space velocity of 1000h -1 Reduction treatment under the same conditions can obtain the supported Pd catalyst of the present invention.

Embodiment 1～20

[0021] The supported Pd catalyst prepared above is adjusted to the reaction conditions, and the feed is reacted. The catalyst carrier, Pd content, preparation conditions, target product reaction conditions, and reaction results are shown in Table 1, Table 2, and Table 3, respectively.

[0022] Table 1

[0023]

[0024] 2. Evaluation of the reactivity of the catalyst:

[0025] 1. Catalyst tank reaction activity evaluation:

[0026] In a 500 milliliter stainless steel high-pressure stirred reactor, add 300 grams of methacrolein and a certain amount (calculated based on the reaction raw materials) of one of the catalysts in the above-mentioned examples 1 to 8, and heat up to Reaction temperature, control reaction pressure 0.5~10MPa, reaction temperature 50~100 ℃, stirring speed 500~2000 rpm. The specific reaction conditions and reaction results in Examples 1-8 are shown in Table 2.

[0027] Table 2

[0028]

[0029] 2. Evaluation of the fixed bed tubular reaction activ...

Embodiment 21～22

[0035] 100 grams of the catalysts in Examples 2 and 5 were respectively loaded into a fixed-bed tubular reactor, and reduced according to the corresponding conditions in Table 1. The methacrolein raw material and hydrogen were mixed and preheated and then entered into the reactor for reaction to investigate the stability of the catalyst. The reaction conditions were the same as in Examples 2 and 5 respectively. The reaction results are shown in Table 4.

[0036] Table 4

[0037]

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Abstract

The invention discloses a method for preparing isobutylaldehyde by performing selective hydrogenation on methylacrolein. In the method, isobutylaldehyde is prepared by performing selective hydrogenation on methylacrolein under the catalytic action of a loaded Pd catalyst, wherein the content of Pd in the catalyst is 0.1-5 percent by weight; and a catalyst carrier is selected from one or more of a molecular sieve, a metal oxide, mesoporous silica, amorphous aluminum silicate, active carbon or a carbon nanotube. The method has a mild reaction condition, high catalyst activity and high selectivity, the conversion rate of the methylacrolein is more than or equal to 99 percent, the isobutylaldehyde selectivity is more than or equal to 95.4 percent, and the catalyst has continuously stable performance after over 1,000 hours of continuous reaction. The method is an effective measure for preparing the isobutylaldehyde by performing selective hydrogenation on the methylacrolein which is prepared by oxidizing isobutene or tertiary butanol serving as a C4 raw material with the air.

Description

technical field [0001] The invention relates to a method for preparing isobutyraldehyde by selective hydrogenation of methacrolein, in particular to a method for preparing isobutyraldehyde by selective hydrogenation of methacrolein by using a supported Pd catalyst. Background technique [0002] Isobutyraldehyde is an important organic chemical raw material, which can be used to produce isobutanol, neopentyl glycol, isobutyric acid, methyl ethyl ketone and other chemical products, among which neopentyl glycol and isobutanol are the two most important downstream products . Isobutanol is a good solvent and can also be used in petroleum additives, antioxidants, antifreeze, synthetic rubber, artificial musk, fruit essential oils and synthetic drugs. Starting from isobutanol, 2,6-di-tert-butyl-p-cresol and diisobutyl phthalate, isobutyl acetate, isobutyl butyrate, isobutyl lactate and triisobutyl citrate can be synthesized Esters, isobutyl sebacate, isobutyl stearate and other e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/02C07C45/62
Inventor 宁春利王剑吴文娟罗鸽张春雷
Owner SHANGHAI HUAYI GRP CO
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