A purification process of pyrolysis by-products in condensation reaction
A condensation reaction and by-product technology, applied in the field of purification technology, can solve the problem of in-depth research in a blank state, achieve significant economic significance, and make full use of the improved effect.
Active Publication Date: 2021-10-08
JIANGSU HUANXIN NEW MATERIAL CO LTD
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Problems solved by technology
[0008] According to the data reported so far, the application of mesitylene and mesityl oxide produced in the process of preparing 3,5-dimethylphenol from isophorone in the acetone condensation reaction has not yet been patented and documented. report, in-depth research in this area is blank
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[0025] As a very important fine chemical product, 3,5-dimethylphenol is widely used, and the preparation of 3,5-dimethylphenol by catalytic cracking of isophorone is a very convenient and efficient method. production process. Isophorone will undergo cracking and dehydration reaction at high temperature to generate mesitylene, and at the same time, isophorone itself will decompose to form mesityl oxide. The total content of these two by-products in the cracking process is relatively low, generally used as Industrial by-products are collected without further utilization. In the present invention, the by-product is processed through a certain procedure to obtain an organic fraction with use value, and then added to the process for preparing isophorone by liquid phase condensation of acetone, so as to realize full utilization of raw and auxiliary materials.
[0026] figure 1 It schematically shows the purification process of the pyrolysis by-product in the condensation reaction ...
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The invention provides a purification process of cracking by-products in condensation reaction, including the preparation of organic fraction and the purification in condensation reaction, the preparation of organic fraction: preparing 3,5-dimethylphenol from isophorone The products produced in the process are washed, removed from the high-temperature reaction and the light removal tower in sequence, and the NaOH solution with a concentration of 5% is mixed with the front fraction of the light removal tower at a temperature of 30-40°C to make the phenolic substances and the alkali The reaction produces sodium phenate salt soluble in water and an organic phase insoluble in water. The organic phase is washed at room temperature and separated to obtain the organic phase as an organic fraction; purification in the condensation reaction: combine the organic fraction with acetone , water and catalyst carry out Michael addition and elimination reactions in the reactor to generate isophorone, and the reacted mixture goes through the first step of atmospheric pressure delightening, the second step of normal pressure delightening, The third step is vacuum delightening, deheavy treatment and impurity removal treatment to extract mesitylene and isophorone.
Description
technical field [0001] The present invention belongs to purification technology, more specifically relate to a kind of purification technology of pyrolysis by-product mesitylene and mesityl oxide in condensation reaction. Background technique [0002] Isophorone (Isophorone, ISO) is a condensation product of acetone, its chemical name: 3,5,5-trimethyl-2-cyclohexen-1 ketone, molecular formula: C9H14O, molecular weight: 138.21, colorless or Light yellow transparent liquid, with high boiling point, low hygroscopicity, good dissolving ability, dispersibility and leveling property, it is a good solvent for polymer materials, it can dissolve nitrocellulose, acrylate, alkyd resin, polyester and epoxy resin etc. Due to its unsaturated structure, the double bond can be further reacted to produce important products such as alcohols, acids, amines, esters and isocyanates, which are widely used in plastics, pesticides, medicines, coatings and other industries. [0003] 3,5-Dimethylphe...
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IPC IPC(8): C07C45/69C07C49/603
CPCC07C45/69C07C2601/16C07C49/603
Inventor 陈健明崔迎祥
Owner JIANGSU HUANXIN NEW MATERIAL CO LTD