Multifunctional multiple-effect automatic continuous evaporative crystallization technique and crystallization device

Abstract

The invention relates to an evaporative crystallization process, in particular to the multifunctional multi-effect automatic continuous evaporative crystallization process and a crystallization device. The process preheats unsaturated water solution or organic solution of materials and carries out the continuous evaporation to the material liquid by a multi-effect evaporator, the temperature of the multi-effect evaporator is gradually reduced and the vacuum degree is gradually increased; when the concentration of the material liquid achieves the saturation, the material liquid enters a crystallizer for the flash evaporation crystallization, and products after the crystallization are subjected to the solid-liquid separation in a centrifuge; the unsaturated solution after the centrifugalization is sent back to the device for the further evaporation crystallization, and the evaporated water or the organic solvent is recycled for use after cooling, thereby realizing the continuous production. The evaporative crystallization process can greatly reduce the labor use and improve the productivity, thereby directly bringing economic benefits to enterprises which use the device and simultaneously reducing the national energy consumption.

Description

technical field [0001] The invention relates to an evaporation crystallization process, in particular to a multifunctional and multi-effect automatic continuous evaporation crystallization process and crystallization equipment, which can be widely used in the treatment and recovery of waste in various chemical materials sewage, continuous evaporation crystallization of chemical materials, and solvent extraction. Recycling, environmental sewage treatment, industrial wastewater treatment, seawater desalination treatment, etc. Background technique [0002] In the existing evaporative crystallization process, the evaporator and the crystallizer are operated separately in production, which consumes a lot of energy for equipment operation and increases labor force for equipment operation. Most of the equipment manufacturers use reactors to concentrate the materials, then heat or cool the materials after reaching the required concentration, and crystallize at the corresponding crys...

AI Technical Summary

Problems solved by technology

Most of the equipment manufacturers use reactors to concentrate the materials, heat or cool the materials after reaching the required concentration, and crystallize when the materials meet the corresponding crystallization temperature, and the crystallization temperature is difficult to control

Moreover, the original evaporator did not use the heat source generated when the raw steam heated the material, resulting in high energy consumption and increased production costs

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