Module 5 Flashcards
(26 cards)
integral balances is usually applied to a?
batch process
describe what happens between two instants of time
integral balances
the feed is charged to a vessel at the beginning of the process and the vessel contents are removed sometime later. no mass crosses the system boundaries between the time the feed is charged and the time the product is removed
batch process
it exits through system boundaries
output
enters through system boundaries
input
chemical processes may be classified as?
batch
continuous
semi-batch
these are unsteady-state operation
batch and semibatch processes
this can be either steady-state or transient
continuous process
any process that is neither batch nor continuous
semibatch process
if any of the process variables change with time, ____________________ operation is said to exit
transient or unsteady-state
this indicate what is happening with a system at an instant in time
differential balances
if the values of all the variables in a process do not change with time, except possibly for minor fluctuations about constant mean values, the process is said to be operating at?
steady states
flowcharts indicate known information about the?
state of the process streams
this is commonly used when relatively small quantities of a product are to be produced, while continuous processing generally is better suited to large production rates
batch processing
the inputs and outputs flow continuously throughout the duration of the process
continuous process
it is produced within the system
generation
this can exchange energy and matter
open system
it is built up within the system
accumulation
two types of balances
differential
integral
it is the type of balance usually applied to a continuous process
differential
integral balances can also be written for?
semibatch and continuous processes
chemical processes may be classified as either?
steady-state
transient
this can exchange energy (as heat or work) but not matter (mass), with its surroundings
closed system
each term of the equation is an amount of the balanced quantity and has the corresponding unit
integral balances
