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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

Inactive Publication Date: 2006-12-06
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the above method is complicated, the production cost is high, and the yield of the separation process is also low, it is difficult to obtain the corresponding methyl-cyclohexane

Method used

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

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Effect test

Embodiment 1

[0022] Example 1: No. 120 solvent oil extracted from Yangzi Petrochemical Olefin Factory was used. The solvent oil was analyzed by HP chromatograph. The composition is shown in Table 2, and the compositions in Table 2 are all in mass content. process such as figure 1 As shown, the raw material ① is separated by primary distillation tower T-1, and the light fraction can be cut off. The temperature at the top of the tower is controlled at 94-96°C, the reflux ratio (R) is 2-3, and the temperature at the bottom of the tower is 110-115°C. The bottom is obtained containing more than 34.5% n-heptane and more than 28.9% methylcyclohexane material 2, as shown in Table 3 for details; tower T-1 bottom material 2 is processed by rectifying tower T-2, and the temperature at the top of the tower is controlled 97~101℃, the reflux ratio (R) is 3~4, the temperature of the tower bottom is 112~117℃, and the top of the rectifying tower T-2 can obtain more than 51% of n-heptane and more than 44% o...

Embodiment 2

[0028] Embodiment 2 is substantially the same as embodiment 1, but the mass ratio of composite extractant is,

[0029] Raw materials: S1:S2=1:0.8:0.8.

Embodiment 3

[0030] Embodiment 3 is substantially the same as embodiment 1, but the mass ratio of composite extractant is,

[0031] Raw materials: S1:S2=1:1.2:1.2.

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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.

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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Application Information

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IPC IPC(8): C07C7/04C07C9/15C07C13/18
Inventor 顾正桂
Owner NANJING NORMAL UNIVERSITY
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