Efficient continuous falling film melt crystallizer

Abstract

The invention provides an efficient continuous falling film melt crystallizer. The falling film melt crystallizer comprises a barrel, a feeding port and a discharging port are formed in the top and the bottom of the barrel respectively, a plurality of layers of crystallization areas are sequentially arranged in the barrel from top to bottom, each crystallization area is provided with a plurality of vertically-arranged crystallization pipes, and the crystallization pipes are sleeved with heat exchange pipes. The crystallization pipe heat exchange pipes of the adjacent crystallization areas are in one-to-one correspondence and are communicated with each other; the crystallization pipe positioned on the uppermost layer and the crystallization pipe positioned on the lowermost layer are respectively communicated with the feed port and the discharge port; a cold and hot medium inlet and outlet communicated with the top end of the heat exchange tube in each layer of crystallization area is formed in the cylinder body; and a cold and hot medium inlet and outlet communicated with the bottom end of the heat exchange tube on the lowest layer is formed in the lower part of the cylinder body. The cold and hot medium inlet and outlet is additionally formed in the middle of the barrel, so that the heat exchange uniformity between to-be-purified materials at the upper part and the lower part of the barrel and a cold medium can be improved, and the uniformity of crystallization at the upper part and the lower part of the barrel is further improved.

Description

technical field [0001] The invention relates to the technical field of crystallization equipment, in particular to an efficient continuous falling film melting crystallizer. Background technique [0002] Crystallization is the process by which a substance forms crystals from a liquid (liquid or melt) or gaseous state. Crystallization is an important method for solid purification. It can separate high-purity products, and has the advantages of low energy consumption, safe operation, and wide application range (such as the separation and purification of azeotropes and heat-sensitive substances that cannot be separated by conventional separation methods), etc. . [0003] Falling film crystallization is a new type of crystallization separation technology, which includes three steps of crystallization, sweating and melting. The principle is: the material flows from top to bottom along the tube wall and crystallizes during the flow process, the cooling medium flows along the oth...

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Problems solved by technology

[0006] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of falling film melting crystallizer, is used to solve the separation and purification of adopting existing falling film melting crystallizer, high energy consumption, uneven crystallization thickness, product Technical problems of low purity, low yield and poor production continuity

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