The combination of unit processes

A unit process for manufacturing fireworks is shown quite conveniently by the following simple form of account. 

Materials and labour enter into the left(debit) side and come out of the right (credit) side as finished goods. Practically energies like power or heat and the loss of tools, furniture, fixtures and structures should be added to the left side, but these are quite small in firework manufacture. The operations which move the left side elements to the right are almost all physical and are seldom chemical. For example, the manufacture of potassium picrate as the material for whistles or the nitration of pitch for black snakes belong to the chemical operation. 

To combine unit processes there are three ways as follows  

Materials Labour Pieces A- Pieces A Materials Labour Pieces B— Pieces B Materials Labour Pieces C 

This is the simplest, the most popular and the safest combination. 

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The combination of unit processes 25 Flowsheet for firework manufacture... 

The main unit contains the unit processes and operations, such as separation, combination, division, formulation, heat transfer, conveying, storage, packing. Figure 1-2 shows a general set-up which is independent from the type of process. The combination of unit processes and operations with respect to product properties depends on the product produced. 

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