Melt crystallization Sulzer falling film process

Sulzer A family of processes for purifying organic chemicals by melt-crystallization without using solvents. Two systems are in use static crystallization, and falling-film ciystalliza-tion. The latter is proprietary to Sulzer Chemtec, Switzerland. 

The second group of the batch type of solid layer techniques are those with moving melts. Here again, three processes must be named the MWB-Sulzer, nowadays called Sulzer falling film (CH-PS 1967 U.S. 1985), the ICI-process (GB-PS 1964), and the BASF-process (DE-PS 1976), which is now distributed by the Kvaerner company. In all processes, the crystallization takes place on the inside of tubes, which are cooled from the outside. The melt coming from a feed tank is continuously circulated through the tubes until the crystal coat at the walls is thick enough, i.e., until... 

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