Short-path Distillation (SPD) ¨C often also called ¡±molecular distillation¡± ¨C offers the advantage of distillation at considerably reduced pressure and thus reduced evaporation temperature with distillation rates of 100-150 kg per square meter evaporator surface area an hour. These economical distillation rates can be achieved in the fine vacuum range, i.e. within the pressure range of 0,001 to 1 mbar. It is an excellent method for gently thermal treatment of heat sensitive and high boiling products.
The Short Path Distillation plants in current use for industrial production£¬the mixture of substances to be evaporated is distributed as a very thin film onto the evaporator surface. The thin film is creating by a mechanical agitation system to distribute and mix the film as it flows down the evaporator wall. By mixing this film with wiping elements, the material and heat transfer within the film are additionally improved. The internal condenser is located at the centre of the apparatus to at least be able to distil in the pressure range of the fine vacuum.
• High vacuum degree
• Low evaporation temperature
• Short residence time for heating
• High evaporating efficiency with wiped thin film
• High flexibility for variation in requirements
• High separating degree
Solution in Concentrates
A typical base material for commercial crude Omega-3 fish oil is sardine or anchovy oil from the Pacific, with a content of approx. 18% EPA and approx. 12% of DHA. Tuna oil is also used for special DHA concentrates, as it has up to 25 % of DHA in the crude oil. In general, the concentration of Omega-3 fatty acids in the crude oil should be less than 30 % in total.
Crude fish oil is in form on triglyceride. the distillation of triglycerides requires high temperatures, risking thermal decomposition or transisomerisation of the unsaturated fatty acids, State-of-the-art for the concentration of Omega-3 fatty acids by distillation is the fractionation of their ethyl esters. By multi-stage Short Path Distillation, total Omega-3 EPA and DHA content can be up to 70% or higher. While variability of EPA to DHA ratio is realizable through control of distillation condition and degree of concentration
Solution in Refinery (Purification)
The physical refining of edible oils by short-path distillation instead of the classic physical or chemical refining ¨C especially the removal of free fatty acid and bad-tasting and odour-giving components which are mainly found in the first fractions of a ¡°molecular distillation¡± at comparably low operating temperatures, i.e. between 80¡ãC and 120 ¡ãC with proper range of vacuum.
Advantages in fish oil production
The fish oil processed by Short Path Distillation Technology stands on much better quality on:
• Low level of trans-fattyacids (TFAs)
• low level of oxidation
• Odourless & Colorless
• High purity