Mass transfer equipment is necessary when you want to move one type of material from one phase to another. Examples of this type of operation are:
In order for efficient mass transfer to occur, it is necessary that one achieve intimate contact between the phases. For many of these operations towers are used: bubble towers, spray towers, packed towers. In other applications, a simple well-stirred vessel is used (like a CSTR: continuously stirred tank reactor).
Discuss the need for and describe the types of mass transfer equipment