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Novel process and device for separating and purifying industrial ethanol

A technology of industrial ethanol and new process is applied in the field of new processes and devices for separation and purification of industrial ethanol, which can solve the problems of low relative volatility and high energy consumption, and achieve the effect of saving steam and cooling water.

Active Publication Date: 2020-09-18
雅邦绿色过程与新材料研究院南京有限公司 +1
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AI Technical Summary

Problems solved by technology

Industrial ethanol production methods mainly include biomass fermentation method, ethylene hydration method and synthesis gas production process. In any production process, it is necessary to purify the reaction solution containing methanol, ethanol, water and fusel alcohol to industrial ethanol (95%). The relatively low volatility between methanol and ethanol, and the azeotropy in the ethanol-water system lead to the design of multiple distillation columns and high energy consumption to prepare industrial ethanol during the separation process
In addition, if extractive distillation or azeotropic distillation or membrane separation dehydration or molecular sieve dehydration is used to prepare and produce absolute ethanol, it is also necessary to first concentrate the industrial ethanol raw material solution to industrial ethanol (95%), so the separation process Energy consumption and equipment investment are also key factors affecting the cost of producing absolute ethanol

Method used

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  • Novel process and device for separating and purifying industrial ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Crude ethanol raw material for preparing ethanol from certain corn biomass (35% methanol, 60% ethanol, 4% water, 1% fusel alcohol), the feed rate is 20 tons / hour, and the operating conditions of the rectifying column with the next wall are: tower top The pressure is 150Kpa, the temperature at the top of the tower is 73°C, and the temperature at the bottom of the tower is 92°C. The output of industrial ethanol products is 6.31 tons / hour, and the product is 95.0wt%. Conditions: Tower top pressure 350Kpa, tower top temperature 113°C, tower kettle temperature 124°C, reflux ratio 3:1, production of industrial ethanol product 2 is 6.31 tons / hour, product purity 95.0%, separation element in the tower is Wire mesh structured packing BX500, the recovery rate of industrial ethanol is 99.9%, and the energy consumption of the separation process is 2.33 tons of saturated steam / ton of industrial ethanol product.

Embodiment 2

[0025] Example 2: Crude ethanol raw material (30% methanol, 62% ethanol, 5% water, 1% fusel alcohol) for preparing ethanol from certain potatoes and sugary raw material biomass, the feed rate is 10 tons / hour, and the rectifying column with the next wall Operating conditions: tower top pressure 130Kpa, tower top temperature 70°C, tower kettle temperature 95°C, output of industrial ethanol product: 2.71 tons / hour, product 95.0wt%, separation element in next-door tower is wire mesh structured packing BX500; Operating conditions of the ethanol rectification tower: tower top pressure 300Kpa, tower top temperature 110°C, tower bottom temperature 1124°C, reflux ratio 2:1, industrial ethanol product 2 output 3.81 tons / hour, product purity 95.0%, The separation element in the tower is wire mesh structured packing BX500, the recovery rate of industrial ethanol is 99.9%, and the energy consumption of the separation process is 2.34 tons of saturated steam / ton of industrial ethanol product....

Embodiment 3

[0026] Example 3: Crude ethanol raw material (40% methanol, 54% ethanol, 4% water, 2% fusel alcohol) for preparing ethanol from a synthesis gas through methyl acetate, the feed rate is 10 tons / hour, and the operating conditions of the rectifying column next to the wall : Tower top pressure 110Kpa, tower top temperature 65°C, tower kettle temperature 90°C, output of industrial ethanol products: 2.20 tons / hour, the product is 95.0wt%, the separation element in the next tower is wire mesh structured packing BX500; Distillation tower operating conditions: tower top pressure 250Kpa, tower top temperature 100°C, tower bottom temperature 115°C, reflux ratio 3:1, production of industrial ethanol product 2 is 3.19 tons / hour, product purity 95.0%, inside the tower The separation element is wire mesh structured packing, BX500, the recovery rate of industrial ethanol is 99.9%, and the energy consumption of the separation process is 2.32 tons of saturated steam / ton of industrial ethanol pro...

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Abstract

The invention provides a novel process and device for separating and purifying industrial ethanol. The industrial ethanol separation and purification device comprises a dividing wall rectifying tower,an ethanol rectifying tower, a dividing wall rectifying tower top condenser, a dividing wall rectifying tower reboiler, an ethanol rectifying tower reboiler and a feeding preheater; crude ethanol rawmaterial liquid exchanges heat with an extracted industrial ethanol product A and then enters the middle part of the left side of the dividing wall rectifying tower; the fraction conditions are controlled, heavy components rich in ethanol, water and fusel are extracted from the bottom of the tower; heavy-component substances at the bottom of the tower enter the ethanol rectifying tower and are separated; an industrial ethanol product B is obtained, part of the prepared industrial ethanol product B flows back to the top of the ethanol rectifying tower, a double-effect coupling rectifying process is adopted, thermal coupling heat exchange is carried out on tower top steam of the ethanol rectifying tower and a tower kettle reboiler of the dividing wall rectifying tower, steam of the tower kettle of the dividing wall rectifying tower is saved, and meanwhile cooling water of the tower top steam of the ethanol rectifying tower is saved.

Description

technical field [0001] The invention belongs to the technical field of rectification and purification, and in particular relates to a new process and device for separation and purification of industrial ethanol. Background technique [0002] Industrial ethanol is an ethanol product with a content of 95%, which can be used in printing, electronics, hardware, spices, chemical synthesis, pharmaceutical synthesis, etc. In medical treatment, industrial ethanol is also commonly used to configure ethanol with a volume fraction of 70%~75% as a disinfectant, etc., and it is widely used in the field of medicine and food industry production. Industrial ethanol production methods mainly include biomass fermentation method, ethylene hydration method and synthesis gas production process. In any production process, it is necessary to purify the reaction solution containing methanol, ethanol, water and fusel alcohol to industrial ethanol (95%). The relatively low volatility between methano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C31/08B01D3/14B01D3/32B01D3/42
CPCC07C29/80B01D3/14B01D3/32B01D3/4216B01D3/141C07C31/08Y02E50/10
Inventor 华超陆平唐斌宋太沧白芳
Owner 雅邦绿色过程与新材料研究院南京有限公司
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