Multi-level dephlegmation type solvent recovery tower

Abstract

The invention relates to a multi-level dephlegmation type solvent recovery tower. The multi-level dephlegmation type solvent recovery tower comprises a tube nest evaporator and a distillation still, wherein an evaporation chamber at the upper part of the tube nest evaporator is connected with a feed port of the distillation still, the top of the distillation still is connected with a distillation tower body, and the upper end of the distillation tower body is provided with a tower cap; the tower cap is connected with a vapor phase inlet of a first dephlegmator, and a vapor phase outlet of the first dephlegmator is connected with a vapor phase inlet of a second dephlegmator; a liquid phase outlet of the first dephlegmator is connected with a reflux liquid storing tank, a vapor phase outlet of the second dephlegmator is connected with a vapor phase inlet in the upper part of the third dephlegmator, and a liquid phase outlet in the lower part of the second dephlegmator is connected with the reflux liquid storing tank and a diluted alcohol storing tank; a vapor phase outlet in the lower part of the third dephlegmator is connected with a vapor phase inlet in the upper part of a fourth dephlegmator, and a liquid phase outlet in the lower part of the third dephlegmator is connected with the diluted alcohol storing tank; a third discharge pipe is connected with a fourth discharge pipe, and the fourth discharge pipe is connected with a thick alcohol storing tank; and a liquid phase outlet in the lower part of the fourth dephlegmator is connected with the thick alcohol storing tank. The multi-level dephlegmation type solvent recovery tower provided by the invention can increase the rising steam production, and can improve processing capacity.

Description

technical field [0001] The invention relates to a recovery tower, in particular to a multi-stage fractional condensation solvent recovery tower. Background technique [0002] In the process of stevioside production, a large amount of ethanol is required for analysis, and a large amount of methanol is required for the crystallization of Reba (high sugar) essence, and these solvents can be recovered by distillation. The traditional solvent recovery tower is based on the different concentrations of the solvent, the gas-liquid equilibrium data curve chart, and follows the plate theory to design the distillation column. The key point of the design is the number of theoretical plates. The correct number of theoretical plates can ensure the top of the column. The temperature is controlled at the boiling point temperature of the solvent, and of course reflux can also be used to adjust the tower top temperature. However, such a design concept limits the rising temperature, limits th...

AI Technical Summary

Problems solved by technology

However, such a design concept limits the rising temperature, limits the processing capacity of the recovery tower, and also affects the driving force of the rising steam in the tower, thereby affecting the output of the recovery tower; especially in the process of changing the solvent concentration, the impact is very great. obvious

The heating of the tower kettle of the traditional recovery tower mostly adopts the partition wall heating, the heating area is small, and the heat energy utilization rate is low. Although the tubular heating can also be added, the heat transfer efficiency is relatively low, so the energy consumption of the traditional recovery tower is relatively low. big

Especially when the solvent concentration in the kettle is lower than 5%, it takes a long time to completely remove and recover

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