Method for distilling normal heptane and methyl - cyclohexane by using combination of rectification and compound extracted rectification

A technology of methylcyclohexane and extractive distillation, which is applied in the field of rectification and compound extractive distillation and separation of n-heptane and methyl-cyclohexane, can solve the problem of low yield in the separation process and difficulty in obtaining methyl cyclohexane. -Cyclohexane, complex process and other problems, to achieve the effect of simple process
CN1872820AInactive Publication Date: 2006-12-06NANJING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING NORMAL UNIVERSITY
Publication Date
2006-12-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to a method for rectification and extraction of n-heptane and methyl cyclohexane. The method comprises: (1) pretreating 120# solvent oil in a primary rectification column to obtain a material containing more than 63% of n-heptane and methyl cyclohexane; (2) rectifying the material in a rectification column to obtain an overhead material containing more than 51% of n-heptane and more than 44% of methyl cyclohexane; (3) extracting the overhead material by a composite extractant at an overhead temperature of 98-100 deg.C to obtain an overhead material containing more than 98.9% of n-heptane and a mixed liquid, and discharging the mixed liquid; (4) treating the mixed liquid in a regenerating column to obtain a fraction containing 67% of n-heptane and more than 98.5% of methyl cyclohexane; (5) recycling the other fractions and the extractant. In this invention, the concentrations of n-heptane and methyl cyclohexane are both higher than 98%. The yield of n-heptane is up to 87.5%, and the energy consumption is only 55% that of hydrogenation and rectification method.
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Description

technical field

[0001] The present invention relates to a combination process of rectification and compound extractive rectification, in particular to a combination of rectification and compound extractive rectification to extract n-heptane and methyl-cyclohexane from No. 120 solvent oil, especially a kind of n-heptane Heptane and methyl-cyclohexane rectification and compound extraction rectification separation method. Background technique

[0002] The amount of n-heptane and methyl-cyclohexane contained in No. 120 solvent oil is as high as 40%, so extracting n-heptane and methyl-cyclohexane from No. 120 solvent oil can not only increase the added value of the product, At the same time, the quality of solvent oil can be improved. At present, the market prices of n-heptane and methyl-cyclohexane are relatively good: n-heptane (industrial): 10,000 yuan / T; methyl-cyclohexane: 13,000 / 14,000 yuan / T. N-heptane can be used as an extraction solvent for animal and vegetable oils, a...

Claims

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