Thin Film Evaporator

Drive head of a thin film evaporator
Rigid blade rotor for a thin film evaporator
Bottom part of a thin film evaporator

Thin Film Evaporator, Wiped Film Evaporator

Introduction

Since their introduction more than 50 years ago by Luwa and Samesreuther, today Buss-SMS-Canzler, Thin Film Evaporators, which are also frequently called wiped film evaporators or agitated thin film evaporators have become a generally recognised and accepted solution for difficult and demanding process problems in the areas of distillation, concentration, degassing, drying and reactions.

Buss-SMS-Canzler offers the widest range of different types of Thin Film Evaporators available worldwide, such as:

  • different types of rotor to suit a wide range of different applications
  • vertical or horizontal construction
  • cylindrical or conical design
  • counter or co-current working principle

Features

Thin Film Evaporators differ in the following main technical features from other evaporator types:

  • Continuous and trouble-free processing of viscous, fouling and contaminated fluids by high turbulence in the liquid film, which also reduces the required temperature difference accross the heating surface;
  • Gentle product treatment because of the short residence time and the narrow residence time spectrum in the whole equipment;
  • High evaporation performance because of high surface heat flux;
  • High evaporation ratio in a single pass;
  • Minimum losses in case of product change because of the low hold-up.

Operating Window

Buss-SMS-Canzler Thin Film Evaporators can be used within the following range:

Operating parameters

Operating window

Feed rate kg/h

20 - 100.000

Evaporation rate kg/h

up to 40.000

Heating temperature °C

up to 380 1)

Pressure on process side barg

-1 to 30

Product viscosity at operating temperature mPas

up to 70.000

Residence time min

< 1 2)

Evaporation ratio (concentrate/feed)

up to 1:50 3)

Through put %

20 - 100 3)

1) evaporators with electrical inductive heating up to 600 °C
2) in horizontal evaporators longer residence times possible
3) depending on evaporator type

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