Settling vessel

Absenkung,/. lowering (Geol.) downthrow. Absetz bassin, n. settling tank. behalter, m. settling vessel, settler, -bottich, m. settling tub or vat. 

Absitz-behiUtert m. settling vessel, settler, -biitte, /. (Brewing) settling tub. -dauer, /. settling time. 

For incremental methods of analysis, the sample is theoretically taken from an extremely thin layer in which h2 is nearly equal to hj for cumulative methods of analysis, the amount settling in a particular plane in a given time, normally at the bottom of the settling vessel, is measured... 

There are also process-specific considerations. For example, a long-residence-time settling vessel might allow the use of a demulsifier that diffuses to the interface slowly, but which produces a very well resolved (separated) emulsion, whereas a centrifuge process (having a short residence time) may require a demulsifier that diffuses to the emulsion interface rapidly, but is slightly less effective at emulsion breaking [68],... 

A type of settling vessel used to separate water and oil from an emulsion. Typically, a heated emulsion is treated with demulsifier and introduced into the gun barrel where water settles out and is drawn off. Any produced gas is also drawn off. 

Evaporated solution is then pumped into the stirred continually operating crystallizers where it is cooled from 90° to 25 °C. All impurities and salt crystals are then allowed to separate in settling vessels. The clear solution is afterwards pumped into storage tanks, where a small amount of sodium hypochlorite is added in order to decolorize the lye. 

Thin slurry separated in settling vessels is then centrifuged from the remaining solution. The crystals so gained which contain mainly a triple salt Na2S04. . NaCl. NaOH, are freed from sodium hydroxide by washing with water. 

Bolto and Dixon advocated a system which involves a simple pipeline for the adsorption reaction, in which the magnetized resin and raw water are pumped through a pipe at such a flow rate that turbulence results and the floes are broken apart so that the reaction is complete when the mixture leaves the pipe. The slurry flows into a settling vessel, whereupon the magnetic floes reform and rapid sedimentation ensues. 

The rise rate concept is applicable to the design of continuous flow separation devices. Many designers use retention time for separator sizing, which is acceptable if desirable separator geometry dimensions such as length to width ratios are maintained. The concept of retention time may be apphed directly for design of batch settling vessels. 

Sufficient sulphur monochloride to cover the end of the tube is first placed in the vessel and then ethylene is bubbled in, so arranging the speed of its introduction and the cooling that the temperature of the reaction mixture remains at 30° to 35° C. Meanwhile more sulphur monochloride is added in small portions. Employing 430 kgm. of ethylene, which needs 750 kgm. sulphur chloride, the reaction is completed in about 20 hours. At the end of the reaction the product is siphoned into a settling vessel where the sulphur is removed. 

The sand-reduction process is a cold-water process without solvent. In the first step, the tar-sand feed is mixed with water at approximately 20°C (68°F) in a screw conveyor in a ratio of 0.75 ton to 3 ton per ton of tar sand (the lower range is preferred). The mixed pulp from the screw conveyor is discharged into a rotary-drum screen, which is submerged in a water-filled settling vessel. The bitumen forms agglomerates that are retained by an 840-micron (20-mesh) screen and withdrawn as oil product. The sand readily passes through the 840-micron (20 mesh) screen and is withdrawn as waste stream. 

The froth model described earlier, and shown in Figure 18, produces collapsed globules, composed of a water (and solids) droplet surrounded by a membranous layer made up of asphaltenes and biwetted solids. When such froth is contacted with naphtha, the time required to penetrate the bitumen membrane coating is on the order of 30 min, whereas in a commercial process the elapsed time between naphtha addition and introduction into a settling vessel is less than 1 min. Thus, the diluted froth process stream can contain these globules, probably in floes, which would have a bulk density intermediate between diluted bitumen and water. Such floes would then accumulate in the separation vessel and form an interface layer (sometimes called rag-layer) emulsion, and could potentially form an effective barrier to gravity separation (68). 

Settling vessel, cast iron, steel jacket for heating... 

There are also process-specific considerations. Emulsion treating equipment can be batch or continuous in action. A settling vessel of long residence time... 

For any separator with a size-dependent performance, such as a hydrocyclone, a sedimenting centrifuge or a settling vessel, the grade efficiency varies with particle size, and a graphical representation of this is called the grade efficiency curve (see section 3.2.2). As the value of the grade efficiency has the character of probability, it is sometimes referred to as the partition probability the curve then becomes the partition probability curve or Tromp curve. 

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