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 the separation process, and high three wastes in heavy components, and achieve considerable economic benefits and high yields. The effect of high efficiency and simple production process

Active Publication Date: 2019-05-28
WANHUA CHEM GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for preparing 2-ethylhexanal
  • Method for preparing 2-ethylhexanal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] One stage catalyst preparation:

[0055] Add 65.6L of deionized water to the reactor, and then add 998.6g of nano-alumina with a particle size of 20-50nm to prepare a nano-oxide dispersion, 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 , Adding 323.95g of water, adding the resulting mixed salt solution and alkaline precipitant sodium carbonate to the nano-oxide dispersion at the same time for reaction, the reaction temperature is 80°C, the dropping time is 2h, and the pH of the reaction system during the reaction is controlled to 6. After the dripping is completed, an alkaline precipitation agent is added to adjust the pH to 8, and then aging, the aging temperature is 90°C, and the aging time is 1.5h to obtain a slurry;

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

Embodiment 2

[0064] One stage catalyst preparation:

[0065] Add 98.8L of deionized water to the reaction kettle, and then add 997.6g of nanometer titanium oxide with a particle size of 20-50nm to prepare a nanometer 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, add the resulting mixed salt solution and alkaline precipitant potassium bicarbonate into the nano-oxide dispersion at the same time for reaction, the reaction temperature is 85°C, the dropping time is 2.5h, and the pH of the reaction system during the reaction is controlled as 5. After the dripping is completed, add alkaline precipitant to adjust the pH to 7.5, then age, the aging temperature is 85°C, the aging time is 1h, and the slurry is obtained;

[0067] The slurry was filtered, washed, and dried at 100°C for 12h to obtain a filter cake; then, it was calcined at 800°C for 10h, crushed and pressed into p...

Embodiment 3

[0074] One stage catalyst preparation:

[0075] Add 198.3L of deionized water to the reactor, and then add 996.6g of nano-zirconia with a particle size of 20-50nm to prepare a nano-oxide dispersion, 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, add the resulting mixed salt solution and alkaline precipitant ammonium bicarbonate into the nano-oxide dispersion at the same time to react, the reaction temperature is 85℃, the dropping time is 2.5h, and the pH of the reaction system is controlled during the reaction 7. After the dripping is completed, add alkaline precipitant to adjust the pH to 8.5, then age, the aging temperature is 90℃, and the aging time is 2h to obtain the slurry;

[0077] The slurry was filtered, washed, and dried at 100°C for 24 hours to obtain a filter cake; then, it was calcined at 1200°C for 5 hours, crushed, and pressed into pieces, reduced at 150°C and...

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Abstract

The invention relates to a method for preparing 2-ethylhexanal. The method comprises the following steps that condensation dehydration is carried out on n-butyraldehyde so as to obtain reaction liquidcontaining 2-ethyl-2-hexenal to serve as a raw material, the reaction liquid firstly makes contact with a first-stage catalyst containing Pd, Pt, Cu and Ni, so that an aldehyde polymer can be converted into the 2-ethylhexanal and the like, then the reaction liquid makes contact with a second-stage catalyst containing Pd, Co and Ag, so that a small amount of residual 2-ethyl-2-hexenal can be converted into 2-ethylhexanal, and meanwhile, the aldehyde polymer is further decomposed; and after rectification is carried out, a kettle bottom solution containing 2-ethylhexanal, 2-ethyl-2-hexenal, 2-ethylhexanol and an aldehyde polymer is circulated back to a first-stage reactor, and therefore the conversion rate of the 2-ethyl-2-hexenal is increased, meanwhile, parts of high-boiling residues suchas the aldehyde polymer are converted into the 2-ethylhexanal, and the yield of the 2-ethylhexanal is increased. The method has the advantages that the 2-ethylhexanal can be continuously produced withhigh selectivity and high yield, the product quality is good, and the energy consumption of the three wastes is low.

Description

Technical field [0001] The invention relates to a method for preparing 2-ethylhexanal, in particular to a method for preparing 2-ethylhexanal by two-stage hydrogenation and two-stage recycling. Background technique [0002] 2-Ethylhexanal, also known as isooctyl aldehyde (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 that can be widely used in coatings, plastics, tanning, 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-end light-colored coatings. Isooctanoic acid is mainly used as a salt-forming reagent for the synthesis of penicillin sodium salt by solvent method in medicine. In addition, glyceryl isooctanoate is an excellent plasticizer....

Claims

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Application Information

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Patent Type & Authority Applications(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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