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A kind of ethanol-tert-butanol-water rectification separation method

A separation method and technology for tert-butanol, applied in chemical instruments and methods, separation/purification of hydroxy compounds, organic chemistry, etc., can solve the difficulty of separating ethanol and tert-butanol, and the purity of ethanol and tert-butanol is difficult to achieve. requirements and high energy consumption in the separation process, to achieve the effect of increasing the added value of the enterprise, low price and high purity

Active Publication Date: 2021-12-17
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] When ethanol-tert-butanol-water ternary azeotrope exists at the same time, because water and ethanol azeotrope, tert-butanol and water azeotrope, ethanol and tert-butanol azeotrope, cause the difficulty of separating ethanol and tert-butanol to increase Large, the energy consumption of the separation process is high, and the purity of ethanol and tert-butanol is difficult to meet the requirements

Method used

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  • A kind of ethanol-tert-butanol-water rectification separation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: as figure 1 shown, including the following steps:

[0041] S1. The raw material enters the pre-dehydration tower 1 for pre-dehydration treatment. The operating pressure of the pre-dehydration tower 1 is 101kpa, the operating temperature at the top of the tower is 85-100°C, and the number of theoretical plates is 36-85, preferably 44; the optimal feed Position 26-44 blocks, preferably 29 blocks; the operating reflux ratio of the pre-dehydration tower is 1.8 to obtain gas phase material and water, the gas phase material is a mixture of ethanol, tert-butanol and a small amount of water, and the pre-dehydration tower 1 passes through the preheater at the bottom of the tower The heat of the tower kettle is recovered to effectively save energy consumption, and the water in the tower kettle meets the second-level water quality discharge standard of the national comprehensive sewage discharge standard (GB8978-2002) and is directly discharged;

[0042] S2. enter t...

Embodiment 2

[0048] A1. The raw material enters the pre-dehydration tower 1 for pre-dehydration treatment. The operating pressure of the pre-dehydration tower 1 is 105kpa, the operating temperature at the top of the tower is 85-100°C, the number of theoretical plates is 55, and the optimal feeding position is 38; the pre-dehydration tower The operating reflux ratio is 1.4, and the liquid phase material and water are obtained. The gas phase material is a mixture of ethanol, tert-butanol and a small amount of water. The pre-dehydration tower 1 recovers the heat of the tower kettle through the tower bottom preheater, which effectively saves energy consumption. The water in the kettle meets the national comprehensive sewage discharge standard (GB8978-2002) secondary water quality discharge standard and is discharged directly;

[0049] A2. The liquid phase material that A1 obtains enters azeotropic tower 2 and adds cyclopentane to carry out azeotropic rectification, obtains the mixture of low-bo...

Embodiment 3

[0054] C1. The raw material enters the pre-dehydration tower 1 for pre-dehydration treatment. The operating pressure of the pre-dehydration tower 1 is 110kpa, the operating temperature at the top of the tower is 88-108°C, the number of theoretical plates is 44, and the optimal feeding position is 26; the pre-dehydration tower The operating reflux ratio is 1.6, and the liquid phase material and water are obtained. The gas phase material is a mixture of ethanol, tert-butanol and a small amount of water. The pre-dehydration tower 1 recovers the heat of the tower kettle through the tower bottom preheater, which effectively saves energy consumption. The water in the kettle meets the second-level water quality discharge standard of the national comprehensive sewage discharge standard (GB8978-2002), and is directly discharged

[0055] C2. The liquid phase material that C1 is obtained enters azeotropic tower 2 and adds cyclopentane to carry out azeotropic rectification, obtains the mix...

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Abstract

The invention discloses a rectification separation method for ethanol-tert-butanol contained in waste water, which belongs to the field of multi-component azeotrope separation, and aims to provide a method with low investment, low energy consumption, no discharge of three wastes and high yield Ethanol-tert-butanol-water rectification separation method, the main points of its technical scheme are as follows, the waste water containing ethanol, tert-butanol and water is subjected to pre-dehydration treatment, azeotropic treatment, stripping treatment, extractive distillation treatment, and then ethanol and The tert-butanol is separated to obtain the product ethanol and tert-butanol; the azeotropic treatment stage adds an entrainer to remove water from the remaining material. The invention eliminates the pollution to the environment from the difficult-to-treat waste water, and at the same time recycles and obtains high value-added products.

Description

technical field [0001] The invention relates to the technical field of multi-component azeotrope separation, in particular to an ethanol-tert-butanol-water rectification separation method. Background technique [0002] The molecular formula of ethanol is C 2 h 6 O, liquid density is 0.789g / cm³, ethanol gas density is 1.59kg / m³, commonly known as alcohol, it is a flammable, volatile colorless transparent liquid at normal temperature and pressure, relative density is 0.816, boiling point is 78.4 °C, melting point is -114.3 °C, miscible with water in any ratio; miscible in most organic solvents such as ether, chloroform, methanol, acetone, glycerin, etc. Ethanol has a wide range of uses. Ethanol can be used to make acetic acid, beverages, flavors, dyes, fuels, etc. Ethanol with a volume fraction of 70%~75% is also commonly used as a disinfectant in medical treatment, and it is widely used in national defense chemical industry, medical and health care, food industry, and indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/82C07C29/76C07C29/84C07C31/08C07C31/12
CPCC07C29/76C07C29/82C07C29/84C07C31/08C07C31/12
Inventor 张岩杨海清薛健谢佳华
Owner BINZHOU UNIV
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