Scraped Surface Continuous Crystallizers

CHEM SHOW '99: Scraped surface continuous crystallizers consist of multiple double pipe elements, with 6, 8, 10, or 12 inch nominal diameter inner pipes and larger diameter outer pipes. The annular space between the inner pipe and outer pipe is filled with cooling fluid. Each inner pipe contains a rotating scraper blade element which mixes the process fluid flowing through the inner pipe and scrapes deposits from the inner pipe wall which form as cooling occurs. The majority of crystallization takes place in the bulk fluid which allows growth of easily separable crystals.

A typical commercial sized installation will consist of several double pipe elements, each with a length of 20 to 40 feet, connected in series. Typical equipment uses include dewaxing lubricating oil, crystallization of organic compounds, and viscous liquid cooling.

Armstrong Engineering Associates, Inc., P.O. Box 566, West Chester, PA 19381-0566. Tel: 610-436-6080. Fax: 610-436-0374.