Method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone

A technology of hexene and hydroxyl, applied in the field of dehydration of 4-hydroxy-3-hexanone to produce 4-hexen-3-one, can solve the problems of high reaction temperature, poor catalyst activity, low space velocity, etc., and achieve effective surface area Large, good catalytic performance, the effect of many catalytic active sites

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of high reaction temperature, low space velocity and poor catalyst activity in the prior art, and a new method for preparing 4-hexen-3-one by dehydration of 4-hydroxy-3-hexanone is provided

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone
  • Method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone
  • Method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 7.4 grams of silica sol (SiO 2 Weight content 40%), add sodium metaaluminate, 40% sodium hydroxide aqueous solution again, make molar ratio be: 6.36Na 2 O:Al 2 o 3 : 80.22SiO2 2 , and add water to mix, knead and extrude. After that, it was dried at 100° C. for 1 hour, and then pelletized. A mixture of 2 grams of tetrabutylammonium bromide and 10 grams of distilled water was added in advance in the reaction kettle, a stainless steel mesh was placed above the mixture, the formed molecular sieve was placed on the stainless steel mesh, and the reaction kettle was sealed. The reactor was subjected to gas-solid phase treatment at 150°C for 10 days. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 5 hours to remove the template agent. For the XRD characterization results of the sample, see figure 1 . Afterwards, the obtained material was exchanged three times with 10% by weight ammonium nitrate aqu...

Embodiment 2

[0022] Weigh 7.4 grams of silica sol (SiO 2 40% by weight), then add sodium metaaluminate, 40% aqueous sodium hydroxide solution, so that the molar ratio is: 8Na 2 O:Al 2 o 3 : 100SiO2 2 , and add water to mix, knead and extrude. Thereafter, it was dried at 120° C. for 1 hour, and then pelletized. Add a mixture of 2 grams of tetrabutylammonium hydroxide and 10 grams of distilled water in advance in the reaction kettle, place a stainless steel mesh above the mixture, place the formed molecular sieve on the stainless steel mesh, and seal the reaction kettle. The reactor was subjected to gas-solid phase treatment at 170°C for 5 days. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 5 hours to remove the template. Afterwards, the obtained material was exchanged three times with 10% by weight ammonium nitrate aqueous solution at 80° C., washed twice with water, dried at 120° C. for 10 hours, and calcined at 55...

Embodiment 3

[0025] Weigh 7.4 grams of silica sol (SiO 2 40% by weight), then add sodium metaaluminate, 40% aqueous sodium hydroxide solution, so that the molar ratio is: 4Na2 O:Al 2 o 3 : 60SiO 2 , and add water to mix, knead and extrude. After that, it was dried at 120° C. for 2 hours and cut into pellets. A mixture of 7 grams of tetrabutylammonium hydroxide and 10 grams of distilled water was added to the reaction kettle in advance, a stainless steel mesh was placed above the mixture, the formed molecular sieve was placed on the stainless steel mesh, and the reaction kettle was sealed. The reactor was subjected to gas-solid phase treatment at 180°C for 3 days. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 5 hours to remove the template. Afterwards, the obtained material was exchanged three times with 10% by weight ammonium nitrate aqueous solution at 80° C., washed twice with water, dried at 120° C. for 10 hours,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone and mainly solves the problem that catalysts are low in activity, high in reaction temperature and low in space velocity in the prior art. The 4-hydroxyl-3-hexanone is used as material to contact with catalyst at the reaction temperature of 200 DEG C-400 DEG C at weight hourly space velocity of 0.5-15 hours-1 relative to the 4-hydroxyl-3-hexanone so as to generate 4-hexene-3-one. The catalyst is molecular sieve ZSM-11 (zeolite socony mobil-11). The problem is solved well by the application of the technical scheme. The method is applicable to industrial production of 4-hexene-3-one by 4-hydroxyl-3-hexanone.

Description

technical field [0001] The invention relates to a method for preparing 4-hexen-3-one by dehydrating 4-hydroxyl-3-hexanone. Background technique [0002] 4-Hexen-3-one (CAS: 2497-21-4) is a unique spice (China GB 2760-2007), which is mainly used to prepare food flavors such as Laomu, butter, and horseradish, and has a wide range of uses. [0003] The dehydration reaction of hydroxyl compounds is a reaction in which the hydroxyl and hydrogen atoms on two adjacent atoms in the reactant molecule are removed in the form of water in the presence of a catalyst. Since the oxygen atom of the hydroxyl group contains a lone pair of electrons, it can interact with the proton (H + ) to form oxonium ions, which become strong electron-withdrawing groups due to the positive charges on the oxygen atoms, making the C-O bond easy to dissociate. The whole dehydration reaction includes: generating protonated oxonium salt (R-OH 2 + ), the oxonium salt slowly dissociates into a carbanion, and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C07C49/203C07C45/66B01J29/40
Inventor 李亚男金照生孙兰萍
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap