Continuous Stirred Tank Reactor (CSTR):Flow rate and Reactor Volume

The liquid phase reactions a. A+B--->C b. A+B--->D are carried out in a perfectly insulated CSTR. The desired reaction (a) is first order in A and zero order in B, while the undesired reaction (b) is zero order in A and first order in B. The feed rate is equimolar in A and B. Species A enters the reactor at a temperature of 100 deg C and species B enters at a temperature of 50 deg C. The operating temperature of the reactor is 400 K. The molar flow rate of A entering the reactor is 60 mol/min: CpA=20cal/(mol K), CpB=30cal/(mol K), CpD=50cal/(mol K), and CpU=40cal/(mol K). CA0=0.01 M for a: delta Hrxn = -3000 cal/mol of A at 300K Ka= 1000e^-2000/T min^-1 where T is in K ... click for more

Head-box issues in Pulp Mill : Theoretical Modelling Question

The process in question uses a centrifugal fan pump to convey a 1000 gallon per minute flow containing 2% finely ground wood pulp to a head box...which in turn is supposed to ocnvert turbulent flow to laminar flow and then deposit the water & pulp slurry on a high speed moving wire in order to form a wet fiber mat. However, the head box that we have unfortunately does not create laminar flow --- it instead creates flow vectors that direct a high percentage of the slurry flow from the center of the moving wire to the edges of the moving wire leaving us with a dimensionally imperfect fiber mat that deposits more fiber on the edges of the moving wire form than in the center ---- this causes ... click for more

Inlet velocity and flow from approach piping to the stilling well

Please see the attached file for the fully formatted problem(s). Please see the attached file for the fully formatted problem(s). > 1200 gallons/min of water flows into approach piping that is tapered in design ----- 1000 gallons/min enters a stilling well while 200 gallons per minute recirculates back to a tank: Question: How do you determine the inlet velocity and flow from the approach piping to the stilling well? > The stilling well has a weir so that the water enters the first chamber of the stilling well, then overflows the weir to the 2nd chamber >Then the water enters the inlet to a diffuser tube bank which consists of 36 4" round diffuser tubes that are 18" long ---- ... click for more