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Method of hydrolyzing and cracking isopentenyl methylpentenes ketone for preparing methylheptanone

A technology for prenyl methyl pentenone and methyl heptenone, which is applied in the field of preparing methyl heptenone by hydrolysis and cracking of prenyl methyl pentenone, can solve the problem that the composition of waste liquid is complex and difficult to achieve. Problems such as obtaining high-boiling ketone mixtures to achieve the effect of mitigating conditions

Inactive Publication Date: 2005-03-30
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex components of the waste liquid, and the boiling points of diprenyl ether and isophorone and PMO are very close, it is difficult to obtain a high-boiling ketone mixture containing only PMO by general rectification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0020] The waste liquid is subjected to rectification under reduced pressure to obtain the cracking raw material. The temperature at the bottom of the rectifying tower is 130-180° C., and the rectifying pressure is 10-20 mmHg absolute pressure.

[0021] Content (wt%)

[0022] Add 45.0 grams of the above-mentioned cracking raw materials into a 0.1-liter three-necked flask, and add the required amount of catalyst ethanolamine and sodium hydroxide, stir and heat to 100-140° C. Then slowly add the required amount of water and react for 3 to 5 hours. During the reaction, condense and collect the generated acetone and evaporated other low boiling point substances. When there is no condensate, slowly add the fraction collected by condensation into the reaction solution, and continue the reaction with full reflux for 0.5 to 2 hours. Add 25-110 grams of water to cool down the reaction liquid and continue to stir it, then let it stand to separate layers, and take the upper o...

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Abstract

The preparation process of methyl heptenone with the waste liquid from the production of methyl heptenone from isoprene includes the following steps: decompressing rectification of waste liquid to obtain cracked material; adding inorganic alkali and water into the material to produce hydrolysis cracking reaction in the presence of ethanolamine catalyst with the produced acetone and other evaporated low boiling point matter being condensated and collected; returning the collected matters to reactant to maintain reaction temperature for further reaction; water extracting and separating the reaction product after finishing reaction and taking oil phase material as coarse methyl heptenone product; and further rectifying to obtain refined methyl heptenone product with purity over 98 wt%.

Description

technical field [0001] The invention relates to a method for preparing methyl heptenone by hydrolysis and cracking of prenyl methyl pentenone (Prenyl Mesityl Oxide, hereinafter referred to as PMO). Background technique [0002] Methylheptenone is an important fine chemical raw material, which can be used to prepare linalool, citral and pseudoionone, etc. Methylheptenone can be prepared through the synthesis of isoprene. Firstly, isoprene is reacted with hydrogen chloride to generate chloroisoamylone, and then chloroisoamylone is condensed with acetone to obtain methylheptenone. Since isoprene can be separated from the C5 fraction produced by petroleum cracking to produce ethylene, this is beneficial to the comprehensive utilization of petroleum resources. However, there are many side reactions in this process, that is, the amount of waste liquid (hereinafter referred to as waste liquid) produced by the isoprene synthesis method to produce methyl heptenone is very large, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/67C07C49/203
CPCY02P20/582
Inventor 刘华兵夏顺伟沈连玲徐晓红
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD