System and technology for continuously concentrating and collecting crystals

Abstract

The invention discloses a system and a technology for continuously concentrating and collecting crystals. The system comprises an efficient distiller, a solvent condenser, a solvent receiving tank and a crystallizer, wherein the efficient distiller is used for continuously receiving a dilute solvent solution and an evaporating out solvent; the solvent condenser is used for continuously receiving and condensing the solvent evaporated out from the efficient distiller; the solvent receiving tank is used for receiving the solvent condensed by the solvent condenser; the crystallizer is used or continuously receiving a super-saturated solution, transferred by a delivery pump, from the efficient distiller and carrying out cooling crystallization; mother liquor after crystallization continuously returns to the efficient distiller from the upper part of the crystallizer, crystals are collected from the lower part of the crystallizer, and the solvent receiving tank is connected with a vacuum pump, so that the system pressure is between 0 and 20KPa. According to the system and the technology, three high energy consumption working procedures of twice distillation, the cooling crystallization and the centrifugal separation in a conventional technology are cancelled, the one-time equipment and civil engineering investment can be reduced by more than 1.1 million RMB compared with that of the conventional technology, the energy consumption and the labor cost are saved by more than 5 million RMB, and the economical benefit is obvious.

Description

technical field [0001] The invention belongs to a solvent extraction process, in particular to a continuous concentration and crystal picking system and process. Background technique [0002] In the chemical production process, the production process of extracting a certain product that is solid at room temperature from a certain solvent solution is the solvent extraction process. [0003] As a common chemical production process, the traditional solvent extraction production process has to go through a process of solvent distillation, solvent distillation, freezing and crystallization, and solid-liquid separation, such as figure 2 shown. The dilute solvent solution of a certain crystal is sent to the forced circulation ascending film distillation system for a distillation and concentration. When the distillation reaches a supersaturated solution, crystals of the solute product will be precipitated. When the solid content of the solution is greater than 20%, in order to avo...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned process has cumbersome process, many control points, difficult control of product quality and product yield; large number of equipment and high investment; large amount of steam consumption, high energy consumption; many positions, many operators, high labor costs, etc.

Therefore, solving the problems of high energy consumption and high investment in the solvent extraction process is a problem faced by many companies

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