Energy-saving rectification system and energy-saving rectification method for purifying fusel oil

Abstract

The invention discloses an energy-saving rectification system for purifying fusel oil. The system comprises a fusel oil feeding heat exchanger (22), a methanol rectification column (2), an ethanol rectification column (6), a fusel rectification column (14), and an extractant recovery column (18), wherein a methanol rectification column bottom heat exchanger (23) is further arranged at the bottom of the methanol rectification column (2), a fusel oil feeding line (S1) passes through the fusel oil feeding heat exchanger (22) and then is introduced into the methanol rectification column (2), a bottom discharging line of the methanol rectification column (2) is taken as a feeding line of the ethanol rectification column (6), a bottom discharging line of the ethanol rectification column (6) is taken as a feeding line of the fusel oil rectification column (14), a bottom discharging line of the fusel oil rectification column (14) is taken as a feeding line of the extractant recovery column (18), a bottom discharging line (S2) of the extractant recovery column passes through the methanol rectification column bottom heat exchanger (23) at the bottom of the methanol rectification column (2) and the fusel oil feeding heat exchanger (22) in sequence for heat exchange and then is divided into two branches, one of which is introduced to the ethanol rectification column (6) and the other is introduced to the fusel rectification column (14).

Description

technical field [0001] The invention belongs to the technical field of distillation and purification, and in particular relates to an energy-saving rectification system and an energy-saving rectification method for purifying fusel oil. Background technique [0002] In the process of methanol rectification unit, in order to ensure the product quality of refined methanol at the top of the tower, some fusel oil is extracted from the side line of the atmospheric tower. At present, most enterprises treat it as a cheap oil adjustment process, resulting in a huge waste of resources. waste. Through the analysis of fusel oil components, it can be seen that it contains various fatty alcohols such as methanol, ethanol, propanol, butanol, so it is called fusel oil. These fatty alcohols have high added value. If they are recovered Utilization can not only protect the environment but also reduce certain pressure for enterprises. [0003] figure 1 It is a traditional distillation method...

AI Technical Summary

Problems solved by technology

[0005] Many technicians use methods such as differential pressure thermal coupling and heat pump rectification. These methods can reduce the amount of heat utilities in operation to a certain extent, but because the heat exchange network is too complicated, it increases the actual difficulty in operation; at the same time, the heat pump Rectification requires the addition of high-cost equipment such as compressors and increased power consumption

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