الوصف

 Wiped film evaporator consists of a mechanical rotating device (rotor) consisting of an evaporator, to ensure uniform distribution of the liquid on the heat transfer surface, with the film formation of turbulence, thus reinforcing the heat transfer. We can provide different types of rotors.

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.

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.

Vertical Thin Film Evaporators Working Pinciple

The product to be treated is continuously fed into the vertical Thin Film Evaporator above the heating jacket  and is spread on to the periphery by the distribution ring. The product is then picked up by the rotor blades and immediately formed in to a thin turbulent film on the heat transfer surface.

The volatile components of the feed stock are therefore very quickly evaporated and flow counter-currently with reference to the feed, up towards the top of the evaporator to the rotating separator. Here, entrained droplets or foam are knocked out of the vapour steam and return to the evaporation zone. The evaporated components (low boilers) then flow out of the evaporator in to the condensation stage, column or to another downstream process step. For special applications co-current vapour/product flow can be used in which case a separation vessel is fitted at the bottom of the evaporator below the rotor in place of the normal rotor mounted separator and the upper vapour outlet nozzle.

Application areas:

In the heat exchange projects, wiped film evaporator to obtain a wide range of applications. In particular ( short time ) heat exchange for heat-sensitive materials , scraping the film is conducive to the exchange of heat and scrape through different membrane design , capable of distilling complex products .

Wiped film evaporator is used in the following areas have been concentrated by evaporation , precipitation , stripping reaction , degassing, deodorant ( gas ) for the purpose flavor , achieved good results :

In medicine : antibiotics, tripterygium , astragalus and other herbs , methylimidazole, single nitrile amines and other intermediates ;

Light food : fruit juice , gravy, colors, flavors , fragrances , enzymes , lactic acid, xylose , starch, sugar , potassium sorbate ;

Cosmetic oils : lecithin , VE, cod liver oil , oleic acid, glycerol , fatty acids, waste lubricating oil , alkyl polyglycosides , alcohol sulfates ;

Synthetic resin : polyamide resin , epoxy resin, paraformaldehyde , PPS ( sebacic acid esters of polypropylene ), PBT, acrylic acid esters ;

Synthetic : PTA, DMT, carbon fiber , polytetrahydrofuran polyether polyol ;

Petrochemical : TDI, MDI, trimethyl hydroquinone , trimethylolpropane , sodium hydroxide, etc. ;

Bio- pesticides : acetochlor, metolachlor , chlorpyrifos , furan phenol , Clomazone , such as herbicides, insecticides , herbicides , mites agent ;

Waste Water : inorganic wastewater ;