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Method for separating cyclohexane-methanol heterogeneous azeotrope by double-tower rectification

A double-tower rectification and cyclohexane technology, which is applied in the direction of distillation purification/separation, chemical instruments and methods, and preparation of organic compounds, can solve the problems of implementation and application without separation and low separation effect, and achieve product Purity improvement, effect of improving purity and product yield

Active Publication Date: 2018-10-30
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent (CN1760165A) discloses a method for separating tert-butanol and water by heterogeneous azeotropic distillation. The method uses cyclohexane as an entrainer to perform azeotropic distillation on the tert-butanol-water azeotropic system. As a result, only 98.2% tert-butanol product can be obtained with a mass purity. This method introduces a third substance, and the separation effect is not high
[0006] The patent (CN10986320A) discloses a modeling method for the solvent dehydration tower of heterogeneous azeotropic distillation in an industrial purified terephthalic acid plant. The specific modeling methods are all theoretical analysis, but the implementation and application of specific separation are not given
[0007] In the current published literature, there is no report on the method of utilizing a phase separator to separate cyclohexane-methanol heterogeneous systems

Method used

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  • Method for separating cyclohexane-methanol heterogeneous azeotrope by double-tower rectification

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The feed temperature is 25°C, the flow rate is 1000kg / h, and the pressure is 1atm (absolute pressure). The feed contains 40% cyclohexane and 60% methanol. After the material is separated in a phase separator (DEC), the methanol phase Enter the methanol tower (T1) tower from the first tray, the operating pressure is 0.5atm (absolute pressure), the number of theoretical plates is 20, the reflux ratio is 2.0, the temperature at the top of the tower is 39.86°C, and the temperature at the bottom of the tower is 50.26°C; The alkane phase enters the cyclohexane tower (T2) from the first tray, the operating pressure is 0.5atm (absolute pressure), the number of theoretical plates is 20, the reflux ratio is 2.9, the temperature at the top of the tower is 38.24°C, and the temperature at the bottom of the tower is 66.45 ℃; the cyclohexane product mass fraction obtained after separation is 99.92%, and the recovery rate is 99.92%, and the methanol purity is 99.95%, and the recovery ra...

Embodiment 2

[0034] The feed temperature is 25°C, the flow rate is 1000kg / h, and the pressure is 1atm (absolute pressure). The feed contains 60% cyclohexane and 40% methanol. After the material is separated in a phase separator (DEC), the methanol phase Enter the methanol tower (T1) tower from the first tray, the operating pressure is 0.5atm (absolute pressure), the number of theoretical plates is 25, the reflux ratio is 2.8, the temperature at the top of the tower is 37.16°C, and the temperature at the bottom of the tower is 54.54°C; The alkane phase enters the cyclohexane tower (T2) from the first tray, the operating pressure is 0.5atm (absolute pressure), the number of theoretical plates is 23, the reflux ratio is 2.8, the temperature at the top of the tower is 40.25°C, and the temperature at the bottom of the tower is 69.89 ℃; after separation, the cyclohexane product mass fraction is 99.94%, and the recovery rate is 99.95%, and the methanol purity is 99.89%, and the recovery rate is 99...

Embodiment 3

[0036] The feed temperature is 25°C, the flow rate is 1100kg / h, and the pressure is 1atm (absolute pressure). The feed contains 80% cyclohexane and 20% methanol. After the material is separated in a phase separator (DEC), the methanol phase Enter the methanol tower (T1) tower from the first tray, the operating pressure is 0.5atm (absolute pressure), the number of theoretical plates is 28, the reflux ratio is 3.4, the temperature at the top of the tower is 40.25°C, and the temperature at the bottom of the tower is 58.46°C; The alkane phase enters the cyclohexane tower (T2) from the first tray, the operating pressure is 0.5atm (absolute pressure), the number of theoretical plates is 26, the reflux ratio is 3.2, the temperature at the top of the tower is 43.46°C, and the temperature at the bottom of the tower is 73.21 ℃; the cyclohexane product mass fraction obtained after separation is 99.98%, and the recovery rate is 99.98%, and the purity of methanol is 99.99%, and the recovery...

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Abstract

The invention relates to a method for separating a cyclohexane-methanol heterogeneous azeotrope through double-tower rectification. A device mainly comprises: a methanol tower T1, a cyclohexane tower T2, a phase splitter DEC, a reboiler H1, a condenser H2, a reboiler H3, a refluxing tank D1, a refluxing tank D2, a valve, a pressurizing pump and a pipeline. The method comprises the following separation steps: conveying fresh materials into the phase splitter DEC; after carrying out phase splitting, conveying two liquid phases into the methanol tower and the cyclohexane tower respectively; obtaining methanol and cyclohexane products at tower bottoms of the two towers respectively; after mixing material flows at the tops of the two towers, condensing and circulating the material flows back to the phase splitter. According to the method provided by the invention, a related substance is a heterogeneous azeotrope mixture; the problem that common distillation of an azeotropic system is difficult to separate is overcome; a third substance does not need to be added; the method provided by the invention has the advantages of low energy consumption, high product purity and high recycling rate.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and in particular relates to a method for separating cyclohexane-methanol heterogeneous azeotropes by double-tower rectification, and is particularly suitable for separating heterogeneous azeotropes which are difficult to separate by ordinary rectification. Background technique [0002] Cyclohexane is a colorless liquid liquid with gasoline odor. It is often used as a solvent for rubber, paint, and varnish, as a thinner for adhesives, as a grease, and as an extractant for essential oils. Because of the low toxicity of this product, it is often used in industrial processes such as degreasing, degreasing and paint removal instead of benzene. Methanol is a colorless and volatile liquid that is used in the manufacture of formaldehyde and pesticides, as an extractant for organic matter and as a denaturant for alcohol. [0003] When cyclohexane is used in the paint s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/80C07C31/04C07C7/04C07C13/18
CPCC07C7/04C07C29/80C07C31/04C07C13/18
Inventor 朱兆友贾慧胡佳静赵婷然王英龙
Owner QINGDAO UNIV OF SCI & TECH