Agitated tank

Dispersed-Solids Leacbing Equipment for leaching fine solids by dispersion and separation includes batch tanks agitated by rotating impellers or by air and a variety of continuous devices. 

Batch Stirred Tanks Tanks agitated by coaxial impellers (turbines, paddles, or propellers) are commonly used for batch dissolution of solids in liquids and may be used for leaching fine solids. Insofar as the controlhng rate in the mass transfer is the rate of transfer of mate-... 

The flow patterns for single phase, Newtonian and non-Newtonian liquids in tanks agitated by various types of impeller have been repotted in the literature.1 3 27 38 39) The experimental techniques which have been employed include the introduction of tracer liquids, neutrally buoyant particles or hydrogen bubbles, and measurement of local velocities by means of Pitot tubes, laser-doppler anemometers, and so on. The salient features of the flow patterns encountered with propellers and disc turbines are shown in Figures 7.9 and 7.10. 

Stirred tank (agitated) reactors consist of a tank fitted with a mechanical agitator and a cooling jacket or coils. They are operated as batch reactors or continuously. Several reactors may be used in series. 

As we shall see, towers have the largest mass transfer driving force and in this respect have an advantage over tanks. Agitated tanks have the smallest driving force. 

Slurry handling Dispense engines Blending Piping systems Storage tanks Agitation Metrology Filtration... 

Pump pressure Low shear on slurry Poor pressure tank agitation... 

Install Storage Tank Agitators on Crude Oil Tanks. Agitation of the vessel contents prevents the deposit of settleable solids and hence reduces the need for cleaning. It must be noted that agitation does not be itself reduce the amount of waste generated it simply transfers the solids downstream to the crude unit - they eventually end-up either in asphalt or coke. 

Install storage tank agitators on crude oil tanks SR USEPA 1986... 

Fig. 1. ASPEN-Plus PFD of carbonic acid pretreatment process as analyzed in this study. Bl, pretreatment reactor (Rstoic) B2, screw mixer B3, blowdown tank and screw conveyor B4, slurrying tank and tank agitator B5, cooler B6, reflux drum and condenser B7, feed pump B8, in-line C02 mixer B9, heater BIO, pneumapress filter Bll, heat exchanger B12, loading pump B13, C02 compressor B14, primary filtrate pump.

After standing in reactor 12, the mixture is cooled there down to 30 °C and filtered in nutsch filter 16 from diethylaminochloride. The filtrate is sent into tank 17 for distillation, and the filter cake is washed with toluene to eliminate amidation products as completely as possible. After the filtrate has been loaded, cooler 18 is filled with water, and the tank agitator is switched on. A residual pressure of 40-55 GPa is created in the system and the tank jacket is filled with a heat carrier or vapour. First, receptacle 20 receives toluene (below 60-65 °C) after separating toluene, amidation products are distilled into fractions. Receptacle 21 receives the intermediate fraction (below 106 °C) the distillation is monitored by the refraction index. At no20 = 1.4210+1.4230 the target fraction, diethylaminomethyl-triethoxysilane, is separated into receptacle 19. The distillation is continued up to 140 °C. As it accumulates, the intermediate fraction from receptacle 21 is sent into apparatus 12 for repeated amidation, and the ready product, diethylaminomethyltriethoxysilane, is sent after additional filtering (in case there is a filter cake) from receptacle 19 into collector 22. 

The only large scale tests that have been carried out using ionic liquids were in collaboration between Anopol Ltd and the University of Leicester for the electropolishing of stainless steel. Figure 11.14 shows a 1.3 m3 tank that was constructed from polypropylene with polypropylene, nylon and polyethylene fittings and run as a pilot plant. It has a standard 3 kW heater to maintain the liquid at 50 to 60 °C. Tank agitation was achieved by recirculation of electrolyte via eight banks of inductor nozzles [68],... 

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