p ws water vapor saturation pressure (Pa) e the constant 2.718. An example is the methanol and acetic anhydride reaction. The maximum saturation pressure of the water vapor in moist air varies with the temperature of the air vapor mixture and can be expressed as: p ws e (77.3450 + 0.0057 T - 7235 / T) / T 8.2 (1) where. Where A and B are constants and T is the absolute temperature. Systems that behave in this manner obey the Antoine relationship between pressure P and temperature T as represented by The principal parameter determining the vent size is the rate of the temperature rise at the relief set pressure. The reaction is tempered, and the total pressure in the reactor is equal to the vapor pressure. Boiling is attained before potential gaseous decomposition (i.e., the heat of reaction is removed by the latent heat of vaporization). It is the rate of temperature increase (i.e., power output) between the set pressure and the maximum allowable pressure, which determines the vent size and not the peak rate. The expansion ratio is: (10) v s P P Er Mach number of steam vacuum before mixing with driving steam nozzle is expressed as follows. h2 hs n (hs h2is ) (9) The vapor in the mixing chamber, the expansion process isentropic will get through. may distribute into three possible phases: (a) the vapor hydrocarbon phase.
The pressure generated by the reaction is due to the increasing vapor pressure of the reactants, products, and/or inert solvent as the temperature rises. enthalpy in exit nozzle is calculated in which vapor pressure is input by suction. In this type of reaction, no permanent gas is generated.
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