Question

Task # 4

A laboratory scale packed bed reactor (PBR) with catalytic particles is used to make experimentswith an irreversible 1st order gas phase reaction A → product at 500 K. The rate constant forthe reaction, determined by conditions where mass transport resistance could be neglected, is found to k '= 7E15 exp (-18000 / T) m3 / (kgcat s). The particles are spherical with a diameter of D = 2 mm and onedensity of 1200 kg / m3.

4.1

If the effective diffusion coefficient is estimated at 10-6 m2 / s, calculate the efficiency factor ƞ. thereis disregarded for gas film resistance.

4.2

The product formed by the reaction condenses immediately and is thus not present in itthe gas phase. How much catalyst mass W must be used in PBR to achieve a conversion rateX of A of 75% if the feed flow consists of 50% A and 50% inert I and the volume flow is 0.01 m3 / s?

Answer #1

Task # 4
A laboratory scale packed bed reactor (PBR) with catalytic
particles is used to make experimentswith an irreversible 1st order
gas phase reaction A → product at 500 K. The rate constant forthe
reaction, determined by conditions where mass transport resistance
could be neglected, is found tok '= 7E15 exp (-18000 / T) m3 /
(kgcat s). The particles are spherical with a diameter of D = 2 mm
and onedensity of 1200 kg / m3.
4.2
The...

A laboratory scale packed bed reactor (PBR) with catalytic
particles is used to make experimentswith an irreversible 1st order
gas phase reaction A → product at 500 K. The rate constant forthe
reaction, determined by conditions where mass transport resistance
could be neglected, is found to k '= 1,6237 m3/kcat S . The
particles are spherical with a diameter of D = 2 mm and onedensity
of 1200 kg / m3.
Radius R=1x10-3
Thiele modul Ø=44,141
4.2
The product formed...

A packed bed reactor has the reaction A --> B occurring. The
rate law is –rA = kCA where k = 15 L/g-min. The superficial gas
velocity is 4.8 kg/m2-s with a density of 0.45 kg/m3 and a
viscosity of 3.9x10-5 kg/m-s. The porosity, catalyst density, and
particle diameter are, respectively, 0.45, 2.2 g/cm3 and 0.255 cm.
The cross sectional area of the reactor is 12 cm2. The inlet
pressure is 100 kPa. Calculate the conversion ‘X’ when the catalyst...

The gas phase reaction: 2A+B = 3C , is carried out in an
isothermal packed bed reactor. The rate is first order with respect
to reactants A and B (second order overall) with the rate constant
of 14 [liter2 /mole kg of catalyst sec.]. The feed is 50% A, 25 % B
and 25 % inert at temperature of 500 K and P = 18 atm and a total
flow rate of 20 mole/sec. The exit pressure is measured to...

Consider a plug flow reactor with a reversible isothermal
gas-phase reaction:
A + B <--> C
The reactor feed consists of a mixture of 50% A and 50% B. The
reaction rate is: (-rA) =
k1*CA*CB -
k2*CC2 The inlet temperature is
500 K and the total pressure is 200 kPa. The volumetric feed flow
rate is 10 m3/s. The rate constants have a values of:
k1 = 0.1 m3/(mol*s) and k2 = 0,05
m3/(mol*s).
a) Calculate the conversion of...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 10 minutes ago

asked 18 minutes ago

asked 46 minutes ago

asked 48 minutes ago

asked 55 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago