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Process for one-step synthesizing ester from aldehyde

A single technology for the synthesis of esters, applied in the field of ester synthesis, can solve the problems of long process routes and serious pollution, and achieve the effects of high reaction yield, easy separation, and low water content

Inactive Publication Date: 2005-01-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method not only has a long process route and serious pollution, but also many alcohols and acids used are usually derived from aldehydes

Method used

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  • Process for one-step synthesizing ester from aldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: add 35g isoamyl alcohol (analytically pure) and 1.8g aluminum powder (100-200 order, chemically pure) in 100 milliliters of there-necked flasks with electric stirrer, condenser, thermometer, add under constant stirring 1.5g anhydrous aluminum trichloride and 0.018g iodine (analytically pure), be warming up to reflux, at this moment visible reaction system color becomes gray, dark gray, black gradually, and gas is released, after stirring reaction 5h, cooling, reducing After pressure distillation removed excess isoamyl alcohol, obtain 21g aluminum isoamyl alcohol products. Then add 40g isovaleraldehyde (chemically pure) in 100 milliliters there-necked flasks with electric stirrer, condenser, thermometer, add 3.2g aluminum isoamyloxide, 1.6 aluminum isoamyloxide prepared in front in many batches in a small amount under constant stirring g anhydrous zinc chloride (analytical pure), control the temperature to 15-25 ° C, with the addition of aluminum isoamyloxi...

Embodiment 2

[0015] Embodiment 2: in 100 milliliters of there-necked flasks with electric stirrer, condenser, thermometer, add 36g propanol (analytical pure) and 2.7g aluminum powder (100-200 order, chemically pure), add 1.8 under constant stirring g of anhydrous aluminum trichloride and 0.036g of iodine (analytically pure), heated to reflux, stirred and reacted for 2 hours, cooled and distilled off under reduced pressure to remove excess propanol to obtain 23g of aluminum propoxide product. Then add 40g propionaldehyde (industrial product) in 100 milliliters of there-necked bottles with electric stirrer, condenser, thermometer, add aluminum propoxide, 2g anhydrous chlorine in many batches altogether in a small amount made before 4g under constant stirring Zinc chloride (analytical pure), the temperature is controlled to 15-25 ° C, with the addition of aluminum propoxide and zinc chloride, the system is accompanied by a phenomenon of temperature rise, after 5 hours of reaction, cooling, vac...

Embodiment 3

[0016] Embodiment 3: add 35g isoamyl alcohol (analytically pure) and 1.8g aluminum powder (100-200 order, chemically pure) in 100 milliliters of there-necked flasks with electric stirrer, condenser, thermometer, add under constant stirring 1.5g of anhydrous aluminum trichloride and 0.018g of iodine (analytically pure), heated to reflux, stirred and reacted for 5h, cooled and distilled under reduced pressure to remove excess isoamyl alcohol to obtain 21g of aluminum isoamyl alcohol product. Then add 20g isovaleraldehyde (chemically pure) and 20g propionaldehyde (chemically pure) in the 100 milliliter there-necked flask with electric stirrer, condenser, thermometer, add 3.2g front preparation altogether in many batches under constant stirring The obtained aluminum isoamyloxide and 1.6g anhydrous zinc chloride (analytical pure) are controlled at a temperature of 15-25°C. With the addition of aluminum isoamyloxide and zinc chloride, the system is accompanied by a temperature rise p...

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Abstract

The invention provides a single step process for synthesizing esters, wherein esters are synthesized from aldehydes in one step at the presence of alkoxy aluminium catalyst and waterless zinc chloride catalyst promoter. Compared with the conventional alcohol acid esterification method, the invention realizes high yield, low moisture content in synthesized product, and readily releasable high purity esters.

Description

(1) Field of invention [0001] The present invention relates to the synthetic method of ester. (2) Background technology [0002] As we all know, the traditional synthesis method of ester is prepared by esterification reaction of alcohol and acid under the catalysis of protonic acid or Lewis acid: [0003] <chemistry num="001"> <chem file="03137599_cml001.xml" / > < / chemistry> [0004] This method not only has a long process route and serious pollution, but also many alcohols and acids used are usually derived from aldehydes. [0005] People such as Zhang Junhua are published on the 4th period of the 15th volume of " fine chemical industry " in 1998 " acetaldehyde method synthesis ethyl acetate " article discloses the synthesis of ethyl acetate and catalyst, but does not disclose can directly make such as Fragrances such as isoamyl isovalerate and isoamyl acetate, and aromatic esters such as benzyl benzoate. (3) Contents of the invention [0006] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/44
Inventor 郑来昌曹镭贾乃红
Owner PETROCHINA CO LTD
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