Sodium chloride aqueous methanol evaporation recovery system

Abstract

The invention relates to an evaporation recovery system for a salt-containing organic solution, which includes a raw liquid storage tank and a first-effect falling film evaporator, the outlet of the raw liquid storage tank is connected to the first-effect feed liquid inlet at the lower part of the first-effect falling-film evaporator through a feed pump, and one The first-effect steam inlet on the upper part of the shell side of the first-effect falling film evaporator is connected to the raw steam pipe, and the first-effect condensate outlet on the lower part of the shell side of the first-effect falling film evaporator is connected to the inlet of the condensate tank through the first-effect condensate pipe; The material separation port at the lower part of the falling film evaporator is connected to the first-effect separator through a connecting pipe, the exhaust port of the first-effect separator on the top of the first-effect separator is connected to the exhaust pipe of the first-effect separator, and the first-effect separator at the bottom of the first-effect separator The feed liquid outlet of the separator is connected with the first-effect feed liquid down pipe, and the first-effect feed liquid down pipe is connected with the first-effect evaporator circulating liquid inlet on the top of the first-effect falling film evaporator through the first-effect circulating pump and the first-effect circulating pipe, and the first-effect The outlet of the circulating pump is also connected with an output pipe for the feed liquid. The method can realize the co-recovery of organic solvent and salt, and has low energy consumption.

Description

technical field [0001] The invention relates to a methanol aqueous solution evaporation recovery system of sodium chloride, which can be applied to the treatment of high-salt organic solutions in the environmental protection industry and the recovery of organic solvents in the food and pharmaceutical industry, and belongs to the technical field of industrial water treatment. Background technique [0002] In the environmental protection and pharmaceutical industries, due to the diversity of the chemical industry, the solution components are becoming more and more complex, and most of them are high-salt and high-organic substances. Usually, the method of recovering organic solvents adopts a rectification process. After separation by rectification, the organic solvent overflows. Inorganic salts still remain in the tower kettle, and the tower kettle needs to be drained regularly. A part of the organic solvent will be entrained in the raffinate, causing loss and reducing the reco...

AI Technical Summary

Problems solved by technology

A part of the organic solvent will be entrained in the raffinate, causing loss and reducing the recovery rate of the organic solvent; at the same time, the inorganic salt is not recycled, which increases the burden of subsequent treatment

In addition, distillation in the tower still requires a large amount of steam and high energy consumption

Images