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Process for producing absolute ethanol through low-grade heat source

An anhydrous ethanol, low-quality heat source technology, applied in the chemical industry, sustainable manufacturing/processing, preparation of organic compounds, etc., can solve the problems of consumption, loss of competitiveness, etc., achieve high efficiency, reduce heat loss, energy The effect of low consumption

Inactive Publication Date: 2013-12-04
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When benzene azeotropic distillation is used, 80kg of absolute ethanol is produced, 175kg of steam and 370kg of water are consumed, and the value of each ton of absolute ethanol produced is about 2,000 yuan, greatly losing the competitiveness with gasoline

Method used

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  • Process for producing absolute ethanol through low-grade heat source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: 100 tons / year absolute ethanol is produced by vacuum heat pump rectification

[0019] The production method operating steps of absolute ethanol are as figure 1 As shown, it is mainly composed of atmospheric rectification tower, reflux tank, heat exchanger, compression heat pump and vacuum rectification tower, etc. Valves and corresponding pipelines are provided between each equipment. Preheat 90% of the raw material liquid to 45°C through heat exchanger H-03, then heat it to 72°C through heat exchanger H-01, and then enter rectification tower T-01, the tower height of rectification tower T-01 is 12 m, tower diameter 0.2 m, structured packing, operating pressure is normal pressure, reflux ratio is 1.1, the gas phase at the top of rectification tower T-01 is compressed by compression heat pump S-01 and heated to 103°C, then enters rectification tower T- 01 Reboiler H-02, the heat released by condensation is used as the heat source of reboiler H-02. After th...

Embodiment 2

[0020] Embodiment 2: 1000 tons / year absolute ethanol is produced by vacuum heat pump rectification

[0021] Preheat 15% raw material liquid to 35°C through heat exchanger H-03, then heat it to 68°C through heat exchanger H-01, and then enter rectification tower T-01, the tower height of rectification tower T-01 is 24 m, tower diameter 0.6 m, structured packing, operating pressure is normal pressure, reflux ratio is 1.8, the gas phase at the top of rectification tower T-01 is compressed by compression heat pump S-01 and heated to 103°C, and then enters rectification tower T- 01 Reboiler H-02, the heat released by condensation is used as the heat source of reboiler H-02. After the condensate passes through the heat exchanger H-01 to heat the raw material liquid, it is depressurized by the throttle valve J-01 and then enters the reflux tank V- 01 reflux, the mass concentration of ethanol taken from the top of the tower is 94.1%. The still liquid of rectification tower T-01 is tr...

Embodiment 3

[0022] Embodiment 3: Production of 10,000 tons / year absolute ethanol by vacuum heat pump rectification

[0023] Preheat the 3% raw material liquid to 31°C through heat exchanger H-03, then heat it to 65°C through heat exchanger H-01, and then enter rectification tower T-01, the tower height of rectification tower T-01 is 30 m, tower diameter 0.8 / 1.4 m, structured packing, operating pressure is normal pressure, reflux ratio is 1.95, the gas phase at the top of rectification tower T-01 is compressed by compression heat pump S-01 and heated to 102.5°C before entering the rectification tower T-01 reboiler H-02, condensation heat release is used as the heat source of reboiler H-02, after the condensate passes through the heat exchanger H-01 to heat the raw material liquid, it is depressurized by the throttle valve J-01 and then enters the reflux tank V-01 refluxes, and the mass concentration of ethanol produced at the top of the tower is 94.4%. The still liquid of rectification to...

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Abstract

The invention relates to a method for producing absolute ethanol, which aims to provide a new process and a device for producing absolute ethanol through low-grade heat source with high efficiency and energy conservation. Main equipment adopted by the invention comprises an atmospheric pressure rectification column, a reflux tank, a heat exchanger, a compressive heat pump, a decompressed rectification column and the like; 3 to 90 percent feed liquid of raw materials is thickened by the atmospheric pressure rectification column and rectified by the decompressed rectification column to obtain the absolute ethanol with mass concentration of over 99.5 percent; in the process, heat in steam at the tops of the columns and waste heat at the bottom of the columns (low-grade heat) are fully used as reboiler heat source to preheat the raw materials; the decompressed rectification column does not need extra heat source so as to reduce the steam consumption for producing the absolute ethanol of mass unit by 30 to 50 percent; and the loss of the ethanol is less than 0.005 to 0.15 percent. The process has the advantages of low energy consumption, high efficiency, no pollution and the like.

Description

field of invention [0001] The invention relates to a new process for producing anhydrous ethanol with high efficiency and energy saving by using a low-grade heat source. Background technique [0002] Absolute ethanol, also known as absolute ethanol, refers to ethanol with little water content. Its relative density is 0.7893 (20°C), melting point is -117.3°C, boiling point is 78.32°C, refractive index is 1.3614, and flash point is 14°C. Absolute ethanol is widely used in many industries such as chemical reagents, medicine, pesticides, paints, pigments, cosmetics, spices, national defense industry, electronics industry, aerospace industry, etc. Add it to gasoline to make gasoline alcohol, which is used as fuel for internal combustion engines. Since the combustion of ethanol does not produce harmful gases, and this gasoline alcohol does not contain lead, the use of this fuel will greatly improve the urban air pollution. [0003] Anhydrous ethanol began to be developed and pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/80
CPCY02P20/10
Inventor 张志炳邵旻周政孙德芳许开天王冠楠
Owner NANJING UNIV
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