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Evaporation technology for the concentration of glycerine water Glycerine, also referred to as propantriol, is a trivalent alcohol which due to its special properties is used in many sectors of industry as lubricant, solvent, plasticisers and humidity stabilisers. Glycerine can be produced by saponification or hydrolysis of natural fats and oils, by fermentation of sugar, by hydrogenation and cracking of carbohydrates or synthetically of propylene. The hydrolysis of animal and vegetable fats and oils (saponification glycerine), the saponification of neutral fats (spent lye glycerine) and, in recent times, the ...

Different concentrations and qualities of glycerine are sold. For this reason, the preparation of raw glycerine which ‐ depending on the production process ‐ is produced with 8 ‐ 15 %, has to meet different requirements. Design of evaporation plants Numerous information are required and marginal conditions have to be considered to find the optimal solution for the particular and customized operating requirements. The following items are especially important: • Product‐specific properties such as initial concentration and final concentration, type and amount of the contained organic impurities ...

For smaller evaporation rates the Wiegand natural circulation evaporator (fig. 4) is frequently used. Its liquid content is smaller, the required construction height is lower and thanks to the fact that circulation pumps are not required it can be operated easily and at very low cost. For higher concentrations up to approx. 90 % the circulation evaporator with divided boiling chamber (fig. 6) is used in order to save heating surface. The product passes three separate chambers one after the other and for this reason, the concentrations and boiling temperatures are different each time....

For higher evaporation rates and for the use of a thermal or mechanical vapour recompressor in order to save energy the falling film evaporator (fig. 6) offers important advantages. Cooling water Service water The use of a falling film evaporator as high concentrator with very low boiling pressure allows to achieve final concentrations of up to 99.8 %. When evaporating salt‐containing spent lye glycerine sodium chloride will precipitate during the concentration if the saturation concentration is exceeded. Contrary to the circulation evaporator which requires a min. temperature difference of 6‐10 °C for a stable ...

Fig. 13: 3‐effect falling film forced circulation evaporator, heated by thermal vapour recompressor A Glycerine water feed B Glycerine water discharge C Vapour condensate D Live steam E Ventilation F Cooling water G Service water Fig. 15: 1‐effect falling film high concentrator, directly heated with live steam A Glycerine water feed (>90%) B Vapour from the pre‐evaporator C1 Live steam condensate C2 Glycerine condensate C3 Vapour condensate D Live steam E Ventilation F Cooling water G Service water K Glycerine water discharge (>99.5%) ...

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