Pressure vessels holding time

A sample of 80 g was introduced into the batch retort. All the pyrolysis tests were performed at a temperature of 500°C, a total pressure of about 8 kPa and a heating rate of 12°C/min. The holding time of the solid residue after con Ietion of the test was one hour. Vapours formed in the reactor were removed and condensed in three traps connected in scries and maintained at -30°C, -78 C and -78 C, respectively. The non condensable gas was removed by the vacuum pump and stored in a vessel previously depressurized. A detailed description of the apparatus is available elsewhere [11]... 

There are times when you might want to know the size of a potential sample of gas before you carry out an experiment. For example, if you were going to react a metal with an acid, you can collect the hydrogen gas that will be generated. In order to figure out how big a vessel must be to hold the gas, you can calculate the size of the gas, at room pressure, ahead of time. Let s do an example where you need to calculate the volume of a 0.0023 mole sample of a gas. Again, the specific type of gas does not factor into the problem, because the molar volume of any gas at STP is 22.4 dm3/mole. 

Figure 8.3 the precipitator is partially filled with the solution of the active substance. CO2 is then pumped up to the desired pressure and introduced in the vessel, preferably from the bottom to achieve a better mixing of the solvent and antisolvent. After a holding time, the expanded solution is drained under isobaric conditions to wash and clean the precipitated particles. 

Cycioaddition and Isolation Program the microwave apparatus for heating open reaction vessels with stirring according to the directions provided by your instructor. Generally, the reaction temperature should be set at 150 °C and the power set at 300 W with a 1-min ramp time and a 2-min hold time the pressure limit should be set at 250 psi. Allow the mixture to cool to room temperature, rerrxjve the flask from the microwave apparatus, and add 10 mL of xylenes. Return the apparatus to the microwave and. using the same directions as before, heat the solution to dissolve... 

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