Short Path Evaporation

Short film evaporation

The Short Film Evaporator System ESF is used for gentle partial evaporation of liquid mixtures, especially when requirements – e.g. high viscosities or very short dwell times – exceed the capabilities of classic evaporators and of the falling film and thin film evaporator systems EFF and ETF.

The raw solution is fed from a feed batch vessel or continuously into the evaporator. A wiper system distributes it evenly around the circumference as a thin film. The low boilers are then partially evaporated from the film flowing down and constantly redistributed on the evaporator surface by the wiper system, condense as distillate on the internal condenser and flow off from there. Similarly, the concentrate exits the evaporator along the heated wall. The distillate and concentrate are either collected in a receiver tank or continuously discharged by a pump.

Vacuum pumps are used to set the desired process conditions such as pressure and temperature. Thermostats (laboratory and pilot scale) are used for heating, evaporation and condensation. On a production scale, classic energy sources such as steam, thermal oil respectively cooling water, brine and glycol are used. A cold trap is used to reduce the undesired entry of low boilers from the exhaust gas flow into the vacuum pump system.

• Evaporators with low hold-up and corresponding short dwell time with narrow dwell time distribution and gentle operating conditions for
  • Laboratory and pilot systems made of stainless steel with borosilicate glass 3.3 in standardized design, optional process-specific adaptations
  • Production systems made of stainless steel in process- and customer-specific design
• Modular supplementary evaporator systems according to process requirements, e.g.
  • Upstream and downstream evaporators, e.g. EFF-ETF system
  • Flash-Box
• Process and customer-specific guidelines, e.g. ATEX, PED, FDA, GMP, ASME, UL standards
• Suitable for media with increased demands:
  • Viscous and highly viscous media
  • Heat-sensitive media
  • Solids-containing media
  • Higher-melting media
• Feasibility studies or existing expertise for typical applications
  • Fatty acids and fatty acid derivatives
  • By-products from the production of edible oil
  • Special polymers or oligomers
  • Pharmaceutical and cosmetic products
  • Specialty chemicals
  • Fragrances and flavourings

Laboratory and pilot evaporator systems and prelminiary test

For many applications, in addition to the composition of distillate and/or residue or concentrate, product properties such as odour and colour are also relevant. Likewise, possible effects that may occur during evaporation, such as foaming or fouling on the heat exchanger surface, must be taken into account. The latter cannot be determined or estimated theoretically, but require a visual evaluation of the evaporation process. This can best be implemented in glass plants from COROSYS, which can be individually assembled in a modular system.

Once the general feasibility has been established, the process parameters for the design of a production plant shall be verified, i.e. heat transfer and maximum area-related evaporation rates or practical number of stages as well as the achievable yields and qualities shall be determined. For this purpose, COROSYS has a standardized series of pilot plants made of stainless steel (optionally also special materials) in various sizes and designs to choose from.

For new evaporation or distillation tasks, COROSYS offers in-house services ranging from literature research, thermodynamic simulations and laboratory tests to piloting of single systems or combinations of falling film (EFF), thin film (ETF) and short path evaporators (ESF), if necessary also in combination with rectification (ERF).

The main objectives and possibilities of preliminary studies/test distillations as well as laboratory and pilot plants are again briefly and clearly summarized in the following table:

Standard modules and options

Short Film Evaporators for laboratory and pilot applications can be assembled from numerous modules and options listed in the table below. For a detailed characterization with process requirements, the questionnaire for evaporator processes is available as a supplement.

Technical specification of industrial evaporators

1) T = Thermostat S= Steam E=Electrical C= Cooling Media CW=Cooling Water

Production-scale evaporator systems

Production plants are usually designed for specific processes, usually on the basis of pilot tests. Typical evaporation capacities of industrial ESF evaporators start from a few kilograms up to several tons per hour. Depending on the product and task, different wiper systems are available. The wiper systems are overhung, optionally equipped with dynamic droplet separators as well as a double-acting mechanical seal to protect the wiper basket shaft from the atmosphere. In principle, fine machining of the surfaces in contact with product and the use of alternative materials are also possible.

The production plants are preferably designed as package units, which on the one hand reduces the customers’ planning effort and on the other hand especially the time required for installation and commissioning on site at the customer.

The construction of the production systems is carried out in compliance with the necessary directives such as PED 2014/68 EU or ASME, ATEX 2014/34 EU, UL standards, GMP guidelines, TA-Luft and the machinery directive 2006/42/EG.

Technical specification laboratory and pilot evaporators

Larger evaporators on request.

Contact us

Do you have any questions?

Contact Engineering

Dr. Lukas Karst
Project Engineering

Phone: +49 6122 / 70 75 - 0
Email lukas.karst@corosys.com

Mr.Mrs.divers

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