Changes

====Batch Systems====

====Batch Systems====

A batch system is one in which all of the materials of the system are placed into a fixed vessel and left to react for an amount of time.  

A batch system is one in which all of the materials of the system are placed into a fixed vessel and left to react for an amount of time. Since there is no flow in or out, the ''in'' and ''out'' terms are both 0. Thus the general balance equation applied to a batch system is:

 

 

 

 

This type of situation is also known as [[chemical equilibrium]].  

====Overall Mass Balance====

====Overall Mass Balance====

:In = Out

:In = Out

Note that an overall mass balance can not be performed on a batch system.

Note that an overall mass balance can not be performed on a batch system, as all terms would equal 0.

 

Another way the general balance equation is used is the ''mole balance'', that is, a balance on the number of [[mole]]s of one component of the system. Since each mole of any given [[chemical]] must weigh the same, a mole balance is simply a direct product of the mass balance. However, mole balances still have advantages over mass balances in some situations (for example, if the flow rates are given in moles per time). The same principles used to form mass balances can be used to form mole balances.

[[category:Chemical Engineering]]

[[category:Chemical Engineering]]