Decanter use

Another nickel cataly2ed process is described ia a Tolochimie patent (28). Reaction conditions claimed are 1—2.4 MPa (150—350 psi) at 100°C minimum. The combination continuous stirred reactor and gravity decanter uses density-driven circulation between the two vessels to recirculate the catalyst to the reaction 2one without the use of filters or pumps. Yield and catalyst usage can be controlled by varying the feed rates. 

Wash twice by decantation using 50 liters of distilled water. 

A 100-mL flask fitted with a rubber septum and a magnetic stirrer is charged with 34.6 mL (25 mmol) of a 0.723 M solution of ( )-IpcBII2 (100% cc) in diethyl ether and cooled to —35 C. 3.2 mL (30 mmol) of 1-methylcyclopentene are added, the reagents are mixed well, then left at —35 °C. without stirring, for 12 h. The supernatant solution is then decanted using a double-ended needle. The crystalline product is washed with two 5-mL portions of cold ( 35 °C) diethyl ether and dried at 25 °C under reduced pressure (12 Torr) ... 

Barium mercuric iodide Barium tetraiodomercurate EINECS 233-160-7 Rohrbach s solution. A soluSon of barium and mercuric iodides (100 g barium iodide and 130 g mercuric iodide heated with 20 cc water to 150-200 C.). The solution is allowed to cool, when a double salt is deposited. The liquid is decanted. Used for separating minerals of different densities also for microchemical detection of alkaloids. Very soluble in H2O. 

Polymerization is allowed to continue under a very slow stream of nitrogen for 15 h. The mixture is cooled, diluted with acetone-water (1 1), stirred until a homogenous suspension is obtained, and filtered. The recovered polymer is washed and fine particles are removed by stirring and decantation using acetone-water (1 2) (3 X 1 L) and then acetone (3 or 4 X 500 mL). The polymer is washed with ether (2 X 500 mL), collected by filtration, and dried (P2O5) in vacuo to yield —15 g of completely beaded resin. The average bead size is 50-100 tm, and the sarcosine content is found to be... 

Figure 8.42 shows the responses of the system with the Flash3 decanter using a direct-acting aqueous-level controller. Figure 8.42a is for positive and negative 20% step changes... 

While we are on the subject of decanters, it is a good time to discuss how to simulate a decanter using Aspen software. There are two models that can be used. These are found under the page tab of Separators on the Aspen Plus window. One is labeled Decanter. The other is labeled FlashS. They have distinct differences that need to be understood. 

Decanter applications certainly obey this differentiation. The number of different utility applications is small, although the main one. the dewatering of waste sludges, is an enormous part of the decanter market. The great variety of decanter uses occurs in the very wide range of process applications. 

Early decanters using eddy current brakes were not able to indicate conveyor torque continuously. A reading of brake speed, and another of brake current, had to be recorded and used when referring to a brake calibration chart, to obtain the brake torque. Conveyor torque could be obtained by multiplying this figure by the gearbox ratio. A typical eddy current brake calibration chart is shown in Figure 7.1. 

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