Continuous multi-stage constant-temperature-difference cooling crystallizer

Abstract

The invention belongs to the technical field of chemical equipment and particularly relates to a continuous multi-stage constant-temperature-difference cooling crystallizer, comprising a crystallizerbody; the top and bottom of the crystallizer body are provided with a feed port and a discharge port respectively; the inside of the crystallizer body is divided into multiple cavities through cavitypartitions; each cavity partition is provided with a fluid passage which is openable; a heat exchange device and a stirrer are arranged in each cavity, and independent temperature control is carried in each cavity; a bottom stirrer is arranged at the lower portion of the bottom cavity; the stirrer in every cavity and the bottom stirrer are connected with a driving device through a stirring shaft.The continuous multi-stage constant-temperature-difference cooling crystallizer is suitable for continuous production, so that labor intensity is reduced, energy consumption for material transfer andpollution are decreased, and equipment utilization efficiency is improved; it can be ensured that crystallized products are good in quality stability and reliability and that the technique is reproducible, and differences between different batches of one material are decreased.

Description

technical field [0001] The invention relates to a continuous multi-stage constant temperature difference cooling crystallizer, which belongs to the technical field of chemical equipment. Background technique [0002] Crystallization is a basic chemical process. Crystallization technology is a conventional technology for separating solid products from liquids. It is often used in the production of products in various chemical fields, such as chemical reagents, medicines, food, etc. will involve crystallization . In industrial production, commonly used crystallization is generally divided into two types: evaporative crystallization and cooling crystallization. The function of cooling crystallization is not only used to produce crystalline substances, but also an integral part of many processes. On the other hand, cooling crystallization can perform purification, purify and purify substances, so as to obtain high-purity products or intermediate products. The crystallizer is a...

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Problems solved by technology

The existing crystallization process equipment is multi-batch, intermittent, slow heat exchange rate, and the operation mode of feeding materials outside the kettle, and there are generally defects such as no certain temperature gradient of the materials in the tank, difficult control of heat transfer temperature difference, uneven stirring, etc. , resulting in defects such as too fine crystal particle size and poor crystal form, and may lead to crystal purity that cannot meet the requirements and seriously affect product quality; moreover, the intermittent crystallization method has high energy consumption, long operation cycle, and high manual operation intensity. Causes operational errors between different batches and seriously affects product quality

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