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A kind of method for preparing 2-ethylhexanal

A technology of ethylhexanal and ethyl, which is applied in the field of preparation of 2-ethylhexanal, can solve the problems of low catalyst processing capacity, high energy consumption in separation process, and three wastes of heavy components, achieves considerable economic benefits, and reduces choice Sexuality, the effect of simple production process

Active Publication Date: 2022-03-08
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for preparing 2-ethylhexanal, so as to solve the problem of high three wastes of heavy components, low yield in the whole process, low catalyst processing capacity, reaction and subsequent separation process in the current 2-ethylhexanal production process. Problems with high energy consumption

Method used

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  • A kind of method for preparing 2-ethylhexanal
  • A kind of method for preparing 2-ethylhexanal

Examples

Experimental program
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Effect test

Embodiment 1

[0054] One-stage catalyst preparation:

[0055] Add 65.6L of deionized water to the reaction kettle, and then add 998.6g of nano-alumina with a particle size of 20-50nm to prepare a nano-oxide dispersion, and the temperature of the dispersion is 75°C;

[0056] Weigh 1.73g Pd(NO 3 ) 2 , 0.33gPt(NO 3 ) 2 , 0.59gCu(NO 3 ) 2 , 0.62gNi(NO 3 ) 2 , add 323.95g of water, and add the obtained mixed salt solution and alkaline precipitant sodium carbonate into the nano-oxide dispersion liquid for reaction at the same time, the reaction temperature is 80°C, the dropwise addition time is 2h, and the pH of the reaction system is controlled to be 6 during the reaction process. After the dropwise addition, add an alkaline precipitant to adjust the pH to 8, then age at 90°C for 1.5 hours to obtain a slurry;

[0057] The slurry was filtered, washed, and dried at 100°C for 18 hours to obtain a filter cake; then roasted at 1000°C for 8 hours, crushed, pressed into tablets, reduced at 135°...

Embodiment 2

[0064] One-stage catalyst preparation:

[0065] Add 98.8L of deionized water to the reaction kettle, and then add 997.6g of nano-titanium oxide with a particle size of 20-50nm to prepare a nano-oxide dispersion, and the temperature of the dispersion is 75°C;

[0066] Weigh 2.60g Pd(NO 3 ) 2 , 0.65gPt(NO 3 ) 2 , 1.18gCu(NO 3 ) 2 , 1.25gNi(NO 3 ) 2 , add 372.8g of water, and add the obtained mixed salt solution and alkaline precipitant potassium bicarbonate into the nano-oxide dispersion liquid for reaction at the same time. The reaction temperature is 85°C, and the dropping time is 2.5h. 5. After the dropwise addition, add an alkaline precipitant to adjust the pH to 7.5, and then age, the aging temperature is 85°C, and the aging time is 1h to obtain a slurry;

[0067] The slurry was filtered, washed, and dried at 100°C for 12 hours to obtain a filter cake; then roasted at 800°C for 10 hours, crushed, pressed into tablets, reduced at 120°C and 5 MPa for 24 hours, and dried...

Embodiment 3

[0074] One-stage catalyst preparation:

[0075] Add 198.3L of deionized water to the reaction kettle, and then add 996.6g of nano-zirconia with a particle size of 20-50nm to prepare a nano-oxide dispersion, and the temperature of the dispersion is 75°C;

[0076] Weigh 3.46g Pd(NO 3 ) 2 , 0.98gPt(NO 3 ) 2 , 1.77gCu(NO 3 ) 2 , 1.87gNi(NO 3 ) 2 , add 1608.80g of water, and add the obtained mixed salt solution and alkaline precipitant ammonium bicarbonate into the nano-oxide dispersion liquid for reaction at the same time, the reaction temperature is 85°C, and the dropping time is 2.5h. During the reaction, the pH of the reaction system is controlled to 7. After the dropwise addition, add an alkaline precipitant to adjust the pH to 8.5, and then age, the aging temperature is 90°C, and the aging time is 2 hours to obtain a slurry;

[0077] The slurry was filtered, washed, and dried at 100°C for 24 hours to obtain a filter cake; then roasted at 1200°C for 5 hours, crushed, p...

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Abstract

The invention relates to a method for preparing 2-ethylhexanal. The reaction solution containing 2-ethyl-2-hexenal obtained by condensation and dehydration of n-butyraldehyde is used as a raw material, and first contacted with a catalyst containing Pd, Pt, Cu, and Ni to convert the aldehyde polymer into 2- Ethylhexanal, etc., are then contacted with a two-stage catalyst containing Pd, Co, and Ag, so that the remaining small amount of 2-ethyl-2-hexenal is converted into 2-ethylhexanal, and at the same time, the aldehyde polymer is further decomposed; After rectification, the still bottom liquid containing 2-ethylhexanal, 2-ethyl-2-hexenal, 2-ethylhexanol and aldehyde polymers is circulated back to the first-stage reactor to increase 2-ethyl ‑2‑hexenal conversion rate, at the same time, some high boilers such as aldehyde polymers are converted into 2‑ethylhexanal, increasing the yield of 2‑ethylhexanal. The invention can continuously produce 2-ethylhexanal with high selectivity and high yield, has good product quality and low energy consumption of three wastes.

Description

technical field [0001] The invention relates to a preparation method of 2-ethylhexanal, in particular to a method for preparing 2-ethylhexanal by two-stage hydrogenation and two-stage circulation. Background technique [0002] 2-Ethylhexanal, also known as isooctylaldehyde (2-EH), is a synthetic raw material for perfume and isooctanoic acid (also known as 2-ethylhexanoic acid). Isooctanoic acid is an important organic chemical product, which can be widely used in coatings, plastics, leather, medicine, wood, chemical fiber, pesticides and other fields, but most of it is used to produce metal salts of isooctanoic acid. Because isooctanoate has a more obvious drying effect than naphthenate, it is widely used in the coating industry to meet people's demand for high-grade light-colored coatings. In medicine, isooctanoic acid is mainly used as a salt-forming reagent for the synthesis of penicillin sodium salt by solvent method. In addition, glyceryl isooctanoate is an excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/62C07C45/67C07C47/02B01J23/89
CPCY02P20/584
Inventor 丛鑫曹善健刘超何光文王泽圣崔乾董科王鹏余炎冰黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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