TUBE CRYSTALLIZER

Continuous scraped surface crystallizer is generally used in cooling crystallization and viscous cooling duties.

WORKING PRINCIPLE

A scraped tube crystallizer, also known as a scraped surface crystallizer, is a device that uses a cooling medium to create crystals from a slurry. It is made up of a jacketed pipe with scrapers that remove solid deposits from the pipe walL

How it works

A cooling medium is circulated between the pipe wall and the jacket. The cooling medium removes heat from the slurry, causing crystallization. The crystals form and stick to the inner pipe wall.

Scraper blades rotate against the inner pipe wall to remove the crystals. The small crystals scraped from the wall act as "seeds" for further crystal growth.

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MAIN DESIGN FEATURES

SUNAKIER continuous scraped surface heat exchangers offer many advantages over other crystallization methods:
The exchangers are designed to run without clogging for extended periods between hot washings.
Fouling tendencies of some slurries are overcome by continuous scraping of the heat transfer surface.
The design is capable of handling higher MTDs than shell and tube equipment.
Operating temperatures range from -75°C ( -103 °F) to + 250°C (482°F).
Weight percent solids as high as 65% have been handled.
Can handle process fluids with viscosities in excess of 10,000 cP.
Near plug flow profile allows for easy transition from batch to continuous process.
Scraped surface crystallizers are more cost effective for larger installations where vacuum crystallization may seem attractive.
The design minimizes shear stress on delicate crystals but is rugged enough to handle tough crystals.
Simple, self-contained construction eliminates the need for excessive instrumentation, condensers, vacuum systems, etc.

BENEFITS

Cost effective for larger installations
Minimizes shear stress on delicate crystals
Rugged enough to handle tough crystals
Simple, self-contained construction

APPLICATIONS

Crystallization of specialty chemicals, polymers, waxes, and resins
Crystallization of edible fats and oils in the food industry
Crystallization of cosmetic ingredients and products
Purification and separation of chemicals
Separation of chiral isomers
Crystal formation of inorganic salts
Palm Oil
Separation of fatty acids
Sterane/olein separation
Shea bitter oil, wax
Lubricating oil
Organic chemicals .
Special Chemicals relevant to the Energy Industries

MODELS AND TECHNICAL SPECIFICATIONS

Feature	Scraped Tube HX	Shell-and-Tube HX	Plate HX	Agitated Crystallizers
Fouling Resista nee	Excellent	Poor	Moderate	Moderate
Viscosity Handling	High	Low-Medium	Low	High
Heat Transfer Efficiency	High	Medium	High	Medium
Crystal Size Control	Precise	Poor	Poor	Moderate
Maintenance Needs	Low	High	Medium	High
Capital Cost	Higher	Lower	Medium	Highest