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Method for separating cyclohexane-methanol heterogeneous azeotrope through 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: 2017-02-22
QINGDAO UNIV OF SCI & TECH
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AI Technical Summary

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 through double-tower rectification

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Effect test

Embodiment 1

[0032] The feed temperature is 25°C, the flow rate is 1000kg / h, the pressure is 1atm (absolute pressure), the feed contains 40% cyclohexane and 60% methanol. After the materials are separated in the phase separator (DEC), the methanol phase Enter the methanol tower (T1) from the first tray, the operating pressure is 0.5atm (absolute pressure), the theoretical number of plates is 20, the reflux ratio is 2.0, the top temperature is 39.86℃, and the bottom temperature is 50.26℃; The alkane phase enters the cyclohexane tower (T2) from the first tray, the operating pressure is 0.5atm (absolute pressure), the theoretical number of plates is 20, the reflux ratio is 2.9, the top temperature is 38.24℃, and the bottom temperature is 66.45 ℃; The mass fraction of cyclohexane product obtained after separation is 99.92%, the recovery rate is 99.92%, the methanol purity is 99.95%, and the recovery rate is 99.96.

Embodiment 2

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

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 materials are separated in the phase separator (DEC), the methanol phase Enter the methanol tower (T1) from the first tray, the operating pressure is 0.5atm (absolute pressure), the theoretical number of plates is 28, the reflux ratio is 3.4, the top temperature is 40.25℃, and the bottom temperature is 58.46℃; The alkane phase enters the cyclohexane tower (T2) from the first tray, the operating pressure is 0.5atm (absolute pressure), the theoretical number of plates is 26, the reflux ratio is 3.2, the top temperature is 43.46°C, and the bottom temperature is 73.21 ℃; The mass fraction of cyclohexane product obtained after separation is 99.98%, the recovery rate is 99.98%, the purity of methanol is 99.99%, and the recovery rate is 99.99.

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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 specifically relates to a method for separating cyclohexane-methanol heterogeneous azeotropes by double-tower rectification, and is particularly suitable for separating heterogeneous azeotropes that are difficult to separate by ordinary rectification. Background technique [0002] Cyclohexane is a colorless, fluid liquid with a gasoline odor. It is often used as a solvent for rubber, paint, varnish, adhesive diluent, grease, and essential oil extractant. Due to the low toxicity of this product, it is often used instead of benzene in industrial processes such as degreasing, degreasing and paint removal. Methanol is a colorless and volatile liquid, used in the manufacture of formaldehyde and pesticides, and used as an extractant of organic matter and a denaturant of alcohol. [0003] When cyclohexane is used in paint stripping or oil cleaning agent industry, a mixtu...

Claims

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Application Information

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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
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