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Method for preparing 1,2-cyclohexan-diol and n-amyl alcohol from light-oil of cyclohexanone by-product as raw material

A technology of cyclohexanediol and by-products, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of complex process, difficult separation, low yield, etc., and achieve simple process and difficult Effect of loss of n-pentanol and low production cost

Inactive Publication Date: 2003-03-26
杨政
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Problems solved by technology

However, because the boiling points of epoxycyclohexane and n-pentanol are very close, it is difficult to separate them by conventional rectification process, resulting in cyclohexanone by-product light oil being treated as three wastes for a long time
Chinese patents CN96118386.1, CN00113505.8, CN98112735.5, and CN94113151.3 have successively proposed methods for recovering the above three substances respectively, but these methods all have the disadvantages of relatively complicated processes and low yields

Method used

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Embodiment Construction

[0009] Take the by-product light oil of cyclohexanone as raw material, take 240 grams of the light oil, add 150 grams of water, 1 ml of concentrated sulfuric acid, react at 60 ° C for 2 hours, and then distill to obtain a 68% n-amyl alcohol solution. The n-pentanol product obtained by rectification has a purity of 99% and a recovery rate of 95.5%; an organic solvent is added to the residue after the crude n-pentanol is distilled to extract oil-soluble substances, and the residue is concentrated to obtain 1,2- The crude cyclohexanediol was recrystallized with an alcohol solvent to obtain 1,2-cyclohexanediol solid with a purity of 99% and a recovery rate of 112%.

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Abstract

The method for preparing 1,2-resorcitol and n-amyl alcohol by using cyclohexanone by-product light oil includes: making the said light oil implement hydration reaction in the presence of inorganic acid, reaction temp. is 30-100 deg.c and reaction time is 0.5-5 hr., and converting the epoxy cyclohexane in the light oil into 1,2-resorcitol; utilizing distillation to distil the n-amyl alcohol contained in the tight oil out, and making rectification to obtain the n-amyl alcohol product whose purity is higher than 99%, then making the bottom residue undergo the conventional processes of removing oil, concentration and recrystallization to obtain solid 1,2-resorcitol product whose purity is higher than 99%.

Description

technical field [0001] The invention relates to a method for preparing 1,2-cyclohexanediol and n-pentanol by using light oil, a by-product of cyclohexanone, as a raw material. Background technique [0002] Cyclohexanone by-product light oil contains a certain amount of epoxy cyclohexane, 1,2-cyclohexanediol and n-pentanol, and these substances are widely used in industry, such as epoxy cyclohexane for Producing decantide pesticide, 1,2-cyclohexanediol is used to synthesize cyclohexanediol ester products, and n-pentanol is used to produce pentanol flavor, etc. However, because the boiling points of epoxycyclohexane and n-pentanol are very close, it is difficult to separate them by conventional rectification process, resulting in light oil, a by-product of cyclohexanone, being treated as three wastes for a long time. Chinese patents CN96118386.1, CN00113505.8, CN98112735.5, and CN94113151.3 successively proposed methods for recovering the above three substances respectively, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/00C07C31/125C07C35/14
Inventor 杨政赵岚俞祖勋
Owner 杨政
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