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CTRM-oilsFT Technologies – Short Path Distillation


FT Industrial has developed the RM series of Centritherm evaporators specifically for short path distillation (also known as molecular distillation / evaporation). Short path distillation covers a range of applications not possible in traditional evaporation units. Specifically short path distillation requires high temperature and high vacuum operation. This RM series of Centritherms have been designed to meet the requirements of short path or molecular distillation, including a unique internal condensing system.


The FT Industrial Centritherm is a thin-film, single-effect, spinning cone evaporator. It operates under vacuum, offers an exceptionally short residence time (approximately 1 sec over the heating surface) and a very small hold up volume.


All this results in minimal thermal impact on the product, the ability to process viscous products and a high degree of processing flexibility. It is ideal for short runs of different products, especially high value products, as there is minimal product loss at the end of the processing run.

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The Centritherm evaporator has a high thermal efficiency. It evaporates more solvent (aqueous or organic) per unit area giving a higher single pass concentration ratio than traditional rising and/or falling film evaporators (plate, tubular or wiped film).


The Centritherm (RM series) for short path distillation is ideal for applications in the edible oil, polymer, chemical, flavor chemical, essential oil and similar industries. Specific applications like recovery of fatty acids (such as omega 3), removal of monomers from polymers and purification of essential oils are just an example of what is possible.

CTRM-product flowCTRM – Advantages


Very thin film
The Centritherm uses centrifugal force to create a thin film of product on a conical heating surface. The film thickness can be measured in fractions of a millimeter resulting in a rapid transfer of heat energy and hence effective evaporation of the volatile (low boilers) material. The film developed is much thinner and more evenly distributed than traditional wiped film evaporator units.

Short residence time

The use of centrifugal force to evenly distribute a thin film results in residence times on the heating surface of typically less than one second. This is substantially shorter than other forms of thin film evaporators. It compares with residence times in the order of 15 to 20m seconds for vertical wiped film short path evaporators.

Low thermal impact

Due to the very short contact time with the heating surface the thermal impact on heat sensitive products in minimal. Even when working at the relatively high temperatures required to separate some higher boiling compounds the impact on the product is minimised.

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Suitable for “short path” and “molecular” distillation

The unique design of these units makes them suitable for short path operation. The internal condenser is designed to reduces the distance that the evaporated molecules travel before contacting the condensing surface to a few centimetres. Product surfaces easily inspected and validated (GMP)

The unit has been designed so that product surface validation is easily achieved. As with all Centritherm evaporation units CIP (clean in place) capabilities are built into the system.


Compact, modular, flexible unit
The RM series Centritherm® thin film evaporation units are constructed as compact modular systems, complete with supporting pumps, pipe work, electrical and control systems. The modular design allows for easy installation of the units in parallel or in series to suite specific applications, particularly where multiple separation steps are required to isolate a particular compound.


The same unit can be delivered with both an internal and an external condenser. To fit the internal condenser and therefore change from medium vacuum to high vacuum operation is a simple task taking only an short time. This makes the unit particularly suitable for production or R&D facilities where multiple tasks are required.


The high heat transfer coefficients developed in the Centritherm lead to greater evaporation rates per unit area than for other types of units. They offer substantial advantages over other thin film evaporation systems, such as wiped film, in terms of size.


The units also offer a choice of materials (including Hastelloy), seal design and heating media