What is Batch Process?

Batch process: A process in which the materials or work are stationary at one physical location while
being treated is termed as batch process. eg: annealing of steel, coke making in coke ovens, furnaces in
foundries, batch reactor in chemical plants.

Batch process are most often of the thermal type where materials are placed in a vessel or
furnace and the system is controlled for a cycle of temperatures under controlled pressure for a period of
time. It is always defined by temperature, pressure or associated conditions such as compositions. Its
degree of freedom is well defined .

The purpose of such processes is to produce one or more products at

  • A given composition
  • A maximum amount
  • Best economy( least materials, energy and time)

Example for batch Process

The batch process has the following advantages versus the continuous process:

  • Flexibility when the feed water quality changes
  • System recovery can be maximized batch by batch
  • Cleaning is easily implemented
  • Simple automatic controls
  • Permeate quality can be controlled by termination of the process
  • Permeate quality can be improved by total or partial second-pass treatment
  • Favorable operating conditions for single (or low number) element systems, because the membranes are only in contact with the final concentrate for a short time
  • Expansion is rather easy
  • Lower investment costs

The disadvantages are:

  • No continuous permeate flow
  • No constant permeate quality
  • Large feed tank required
  • Larger pump required
  • Larger power consumption
  • Longer residence time for feed/concentrate
  • Higher total running costs
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