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Catalyst for producing isobutyraldehyde by selective hydrogenation of methylacrolein, and preparation method thereof

A methacrolein and catalyst technology, applied in the direction of catalyst activation/preparation, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of propylene resource consumption and unsatisfactory demand, and achieve the guarantee of raw materials and low cost Effect

Active Publication Date: 2021-01-12
RUNTAI CHEM TAIXING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current supply of isobutyraldehyde in the market is far from meeting the demand
And adopting this method will also consume a large amount of valuable propylene resources

Method used

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  • Catalyst for producing isobutyraldehyde by selective hydrogenation of methylacrolein, and preparation method thereof
  • Catalyst for producing isobutyraldehyde by selective hydrogenation of methylacrolein, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The catalyst steps for the selective hydrogenation of methacrolein to produce isobutyraldehyde are as follows:

[0025] Mix 64g of nickel chloride hexahydrate (0.27 moles), 150mL of hydrazine hydrate (3.0 moles), 2g of NaOH (0.05 moles), 500mL of ethylene glycol and 120g of tetraethyl orthosilicate (0.58 moles), stir and mix and place in the reaction vessel , heated to 75 ° C for 3 h, the reaction product was fully washed with ethanol, and then dried in vacuum to obtain Ni / SiO 2 , then the Ni / SiO 2 Heating to 300°C for 8 hours under the atmosphere of ammonia gas to generate Nitriding product Ni 3 N / SiO 2 . Among them Ni 3 N accounted for SiO 2 50% of the quality score.

Embodiment 2

[0027] The catalyst steps for the selective hydrogenation of methacrolein to produce isobutyraldehyde are as follows:

[0028] Take 47.5g of nickel chloride hexahydrate (0.2 moles), 200mL of hydrazine hydrate (4.0 moles), 4g of NaOH (0.1 moles), 600mL of ethylene glycol and 106g of tetraethyl orthosilicate (0.51 moles), mix them, stir and mix them and place them in the reaction Kettle, heated to 90 ° C for 4 hours, the product obtained by the reaction was fully washed with ethanol, and then dried in vacuum to obtain Ni / SiO 2 , then the Ni / SiO 2 Heating to 350°C for 7 hours in an ammonia atmosphere produces Nitriding product Ni 3 N / SiO 2 . Among them Ni 3 N accounted for SiO 2 40% of the quality score.

Embodiment 3

[0030] Take 63g of nickel chloride hexahydrate (0.28 mole), 250mL of hydrazine hydrate, 5g of NaOH, 500mL of ethylene glycol and 106g of tetraethyl orthosilicate (0.51 mole), mix them, stir and mix them, put them in a reaction kettle, and heat them to 70-100°C Insulate for 2 to 4 hours, wash the product obtained by the reaction with ethanol, and then dry it in vacuum to obtain Ni / SiO 2 , then the Ni / SiO 2 Heating to 280-350°C for 4-10 hours under the atmosphere of ammonia gas to generate the nitriding product Ni 3 N / SiO 2 . Among them Ni 3 N accounted for SiO 2 60% of the quality score.

[0031] The catalyst prepared in Examples 1-3 is used for the selective hydrogenation of methacrolein to prepare isobutyraldehyde: the catalyst for the selective hydrogenation of methacrolein is loaded into a fixed-bed reactor, and the amount of catalyst added is the mass of methacrolein 1.5% of methacrolein is passed into the reactor, the reaction temperature is 100°C, the pressure is 1...

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Abstract

The invention belongs to the technical field of isobutyraldehyde synthesis, and particularly relates to a catalyst for producing isobutyraldehyde through selective hydrogenation of methylacrolein, anda preparation method of the catalyst. According to the method, methylacrolein is selectively hydrogenated under the action of a catalyst to generate isobutyraldehyde; the used catalyst is Ni3N / SiO2,and Ni3N accounts for 40-60% of the mass fraction of SiO2; and the catalyst is obtained by heating Ni / SiO2 to 280-350 DEG C in an ammonia atmosphere and carrying out a nitridation reaction for 4-10 h.When the catalyst is used in a reaction for generating isobutyraldehyde by selective hydrogenation of methylacrolein, the conversion rate of methylacrolein reaches about 98.5%, and the yield of isobutyraldehyde can reach about 92%. The method is good in economic benefit, and the catalyst low in cost, simple in preparation method, high in activity and selectivity and good in stability, and has potential industrial application value.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for preparing methacrolein from isobutene, a catalyst for selectively hydrogenating methacrolein to generate isobutyraldehyde and a preparation method thereof. Background technique [0002] In order to reduce air pollution caused by gasoline combustion, improve air quality, reduce PM2.5, and protect the environment, ethanol gasoline has been widely promoted across the country, which makes methyl tert-butyl ether, a blending component of gasoline, discontinued. As a result, the 13 million tons / year of isobutene used to produce methyl tert-butyl ether needs to seek other ways of application. [0003] The company uses isobutyraldehyde as the raw material to produce dodecyl alcohol esters. At present, isobutyraldehyde is mainly produced by acryloformylation. Since acryloformylation mainly obtains n-butyraldehyde, the output of isobutyraldehyde is small, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/16B01J37/03B01J37/08C07C45/62C07C47/02
CPCB01J27/24B01J37/16B01J37/033B01J37/08C07C45/62C07C47/02Y02P20/584
Inventor 卢小松宋文国张世元
Owner RUNTAI CHEM TAIXING CO LTD
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