Quiz 4 - a Flashcards
In a chemostat, the _________ is kept constant by setting the inlet and outlet flow rates equal
liquid volume
In steady state condition, where all concentrations within the vessels are ______ of time
independent
At steady state to the limiting substrate, the rate of generation is ________.
zero
In cultures where product synthesis is only indirectly coupled to energy metabolism, the rate of substrate consumption is a function of three factors namely:
growth rate, rate of product formation, and the rate of substrate uptake for maintenance
The rate of biomass production in a CSTR is ______ to the rate at which cells leave the reactor
equal
a type of reactor that do not consider temperature or concentration gradient
Continuous Stirred Tank Reactor (CSTR
In a PFTR, the fluid velocity is
constant
Microbial death is a probabilistic event with _______ kinetics
first-order
__________ is the time of exposure to heat during which the original number of viable microbes is reduced by one tenth
Del factor
measure of fractional reduction in living organisms count over the initial number present
Del factor
rapid transfer of heat to the medium via direct or indirect heating
radiation
Dimensionless number that correlates axial dispersion and bulk fluid flow in pipes
Peclet number
Refers to the process through which air circulates through, mixed with, or dissolves in liquid or substance
aeration
Other term for packed bed reactor
fixed bed reactors
Process wherein the catalyst surface adsorbs the reactant molecules and attaches to the active site.
Contact catalysis
A dimensionless number that correlates film transport rate characteristics to intraparticle diffusion rate characteristic
Sherwood number
Compared with stirred-tank immobilized cell reactors, the shear at the particle surface is much ________ in a fluidized bed
less*/lower
The ________ is the only parameter that the fluidized bed reactor designer is free to choose
density*
Fluidized bed are inherently ___ reactors
CSTRs*
The constant motion of the particles in fluidized bed prevents ______ and _______ allowing air to be delivered directly into the column
channeling; clogging of the bed
Reactor where the upward gas velocity and powder catalyst rate of settling are balanced; the gas input is situated at the bottom center of the mixing zone
Fluidized Bed Reactor
A type of reactor with three-phase systems with flowing gas and liquid phases as well asa packed bed of heterogenous catalyst
Trickle bed reactors
Use to increase the yield of the desired product while decreasing the production of undesirable associated products
catalysts
Measure of the fractional reduction in viable organism count products by a certain heat and time hegime
Del factor
