CONTINUOUS SOLVENT EXTRACTION PLANT

Supplied with drum shaft, brush shaft and mesh cleaning arrangement

Horizontal model comprising of articulated band conveyor assembly, which receives the material from the  F e e d Hopper and transport, it at a very slow predetermined speed from the feed to the discharge end. The conveyor moves over the rails suitably located inside the Extractor and the rides on specially constructed sprocket at either end, adjustable damper for regulation of the height of the bed of material on the chain conveyor, series of Spray breakers for the perfect spray of the solvent on the moving bed, with liberal provision for light sight glasses. Band Conveyor Assembly designed in such a way to act as filter bed for eliminating fines, complete with rotary brushes & mesh cleaning system for effective cleaning of mesh.

Salient features of solvent extraction plant :

Drive : Extractor has single piece Hollow shaft gear box having out put of 0.05 rpm, which is mounted on the extractor main shaft. This is excellence of engineering that avoids the use of Big Gear and pinion arrangement prone to frequent maintenance. Extractor Motor is driven by Variable frequency drive that allows finite adjustment of speed as per processing rates and also allows the data-logging like Run time, stoppage history etc

 

Construction : • Extractor has Single piece miscella hoppers having no joint. This reduces the welding and chances of leakage during operations

  • All body plates and internals are sandblasted and Zink base epoxy primer coated prior to manufacture. This increase life by reducing chances of corrosion and increases life of equipment

Extractor is fabricated in factory, ( site fabrication is avoided) and running trial is taken in factory to ensure trouble free running at site

Prefabrication reduces the time for erection and plant will be started quickly

Selection of size – is such that the bed height is limited to 1.5m which reduces the chances of miscall channelling

Rate of mark feeding to DT is consistent. Which ensures consistence vapour flow and control on hexane loss

Loading of extractor Bed is low, i.e. weight per square m is low compared to true deep bed extractors which ensures low wear and tear of band conveyor, ensuring long life

  • Additional two hoppers – Extra miscella hopper at discharge end to allow more hexane to drain before it is fed to DT, hence load on DT is low ensuring low steam consumption to evaporate Hexane and low water circulation for condensation as well

Extra miscall hopper at feed end to ensure the settling of miscella before it is transferred to Miscella tank. Major fines are settled in this hoppers which are then pumped on the top of extractor

The additional miscella spray of this hopper is used to soak the incoming Flakes so that the regular miscella circulation sprays are used effectively

Vapor tight construction in carbon steel, for Desolventizing as well as toasting, specially designed for oilcake and comprising of a number of stages with bottoms jacketed for the purpose of indirect heating. Centrally rotating shafts provided with scrappers along with sparge steam distribution to ensure uniform heating and movements of the materials in the stages. Fitted with indicators to indicate the level of material in the stages. Final discharge door is later connected with the feeding, complete with driving mechanism. With Pneumatic Meal Level Controlling arrangement.

Salient Features:

Desolventiser toaster is to be provided with hollow shaft steam connections to the blades to facilitate injection of steam in the material through moving blades. This ensures the intimate contact of steam with meal and effective transfer of latent heat to accelerate evaporation of hexane. This system ensures the highest contact ratio between sparge steam and meal to be Desolventised per unit area

Another advantage of sparge steam through blades is, it reduces the number of steam injection nozzles and free working space and operator friendly system, which allows precise controlling of quantity of steam by one valve

DT outlet duct is designed to get the vapor velocity sufficient to cyclonic separation. Wet dust catcher is specially designed with incorporated cyclone separator and Vapors thoroughly washed with water sprays for removal of dust particles. This high efficiency cleaning provides trouble free running of heat exchangers

The provision of plug-o-seal conveyor with variable speed drive at outlet of desolventiser ensures sealing of system. Thus eliminating the possibility of air entry into the desolventiser toaster

DT vapor outlet is routed through various heat exchangers. The condensers and economizer are so designed to achieve.