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Method for separating benzene-toluene-cyclohexane ternary azeotropy system through double thermal coupling ternary extraction rectifying

A three-way, extractive distillation technology for cyclohexane, which is applied in the field of dual-thermal coupling three-way extractive distillation to separate benzene-toluene-cyclohexane three-way azeotropic system, which can solve the problem of large carbon dioxide emissions and low energy utilization , Difficulty in separation and other problems, to achieve the effect of improving energy utilization efficiency, reducing losses and CO2 emissions, and high product purity

Active Publication Date: 2018-11-06
CHONGQING UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal pressure, benzene, toluene and cyclohexane can form a ternary azeotropic system, which cannot be separated by ordinary distillation, and the separation is difficult
And the traditional rectification has high energy consumption, low energy utilization rate, and large carbon dioxide emissions, so special rectification must be used

Method used

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  • Method for separating benzene-toluene-cyclohexane ternary azeotropy system through double thermal coupling ternary extraction rectifying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The mixed solution of a petrochemical enterprise, after separation, the mixed solution is composed of 30% benzene, 30% cyclohexane, and 40% toluene.

[0029] The operating parameters of the extractive distillation column C1 are: the operating pressure is 0.8 bar (absolute pressure), the number of theoretical plates is 80, the position of the mixed liquid inlet b is at the 44th plate, and the position of the extractant inlet a is at the 25th column plate, the reflux ratio is 3.3308, the temperature at the top of the column is 73.1°C, and the temperature at the bottom of the extractive distillation column C1 is 147.4°C. The temperature of the benzene-toluene-cyclohexane mixed solution is 50° C., the flow rate is 100 kmol / h, and the pressure is 1.0 bar (absolute pressure). The extractant DMF (50° C.) enters from the extractant inlet, and the flow rate is 150 kmol / h.

[0030] Cyclohexane is extracted from the top of the extractive distillation tower C1, and enters the cyclo...

Embodiment 2

[0037] Others are the same as Example 1, the difference is:

[0038] The mixed solution of a petrochemical enterprise, after separation, the mixed solution is composed of 35% benzene, 25% cyclohexane, and 40% toluene.

[0039] The temperature of the benzene-toluene-cyclohexane mixed solution is 50° C., the flow rate is 100 kmol / h, and the pressure is 1.0 bar (absolute pressure). The extractant DMF (50° C.) enters from the extractant inlet, and the flow rate is 100 kmol / h.

[0040] The operating parameters of extractive distillation column C1 are: the operating pressure is 0.8 bar (absolute pressure), the number of theoretical plates is 80, the inlet position of the mixed solution is the 45th plate, the position of the extractant inlet is the 24th plate, and the reflux The ratio is 4.0009, the temperature at the top of the column is 73.6°C, and the temperature at the bottom of the extractive distillation column C1 is 147.4°C.

[0041] The operating parameters of the rectificatio...

Embodiment 3

[0044] Others are the same as Example 1, the difference is:

[0045] The mixed solution of a petrochemical enterprise, after separation, the mixed solution is composed of 25% benzene, 35% cyclohexane, and 40% toluene.

[0046] The temperature of the benzene-toluene-cyclohexane mixed solution is 50° C., the flow rate is 100 kmol / h, and the pressure is 1.0 bar (absolute pressure). The extractant DMF (50° C.) enters from the extractant inlet with a flow rate of 120 kmol / h.

[0047] The operating parameters of extractive distillation column C1 are: the operating pressure is 0.6bar (absolute pressure), the number of theoretical plates is 80, the inlet position of the mixed solution is the 44th plate, the position of the extractant inlet is the 25th plate, and the reflux The ratio is 3.2500, the temperature at the top of the column is 73.14°C, and the temperature at the bottom of the extractive distillation column C1 is 147.4°C.

[0048] The operating parameters of the rectificatio...

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Abstract

The invention discloses a method for separating a benzene-toluene-cyclohexane ternary azeotropy system through double thermal coupling ternary extraction rectifying. An extraction reaction is performed on an extraction agent DMF and a mixture in an extraction rectifying column C1, then a high-purity cyclohexane product is obtained at the top of the extraction rectifying column, a high-purity extraction agent DMF is obtained at the bottom of the extraction rectifying column to be recycled, two gas-phase material flows are extracted from the lateral lines of the extraction rectifying column C1and enter rectifying columns C2 and C3, and a high-purity benzene product and a high-purity toluene product are obtained at the tops of the rectifying columns C2 and C3. The separation problem of a benzene-toluene-cyclohexane ternary azeotropy system is solved by a double thermal coupling ternary extraction rectifying column, so that defects that traditional extraction rectifying energy consumption is high, the energy utilization rate is low, and the CO2 emission is high and the like are overcome.

Description

technical field [0001] The invention relates to a method for separating a benzene-toluene-cyclohexane ternary azeotropic system by dual-thermal coupling ternary extraction and rectification, which belongs to the field of rectification and purification. Background technique [0002] Benzene, cyclohexane and toluene are important chemical raw materials. Benzene is a kind of hydrocarbon, which is the simplest aromatic hydrocarbon. At normal temperature, it is a sweet, flammable, carcinogenic and toxic colorless transparent liquid with a strong aromatic smell. It is hardly soluble in water, easily soluble in organic solvents, and can also be used as an organic solvent itself. Benzene is a basic petrochemical raw material, and its output and production technology level are one of the symbols of a country's petrochemical development level. Toluene is widely used as a solvent and high-octane gasoline additive, and is also an important raw material for organic chemical industry. ...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/08C07C7/04C07C13/18C07C15/04C07C15/06
CPCC07C7/005C07C7/04C07C7/08C07C2601/08C07C13/18C07C15/04C07C15/06
Inventor 申威峰杨傲
Owner CHONGQING UNIV
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