The vessel where a unit process occurs is called a Reactor. Designing a unit process involves selecting the reactor type:

These operations deal with the flow of fluids (liquids and gases).

These operations involve the transfer of thermal energy.

Adopting a new unit operation process yields measurable returns:

| Metric | Typical Improvement | |--------|---------------------| | Overall Equipment Effectiveness (OEE) | +15–25% | | Energy consumption | -20–35% | | Waste / off-spec product | -40–60% | | Unplanned downtime | -50–70% | | Time-to-market for new products | -30–40% (due to modular reconfiguration) |

Environmentally, the new approach directly supports Green Chemistry principles. Because each unit operates with real-time awareness of its neighbors, solvent losses, fugitive emissions, and thermal pollution are drastically reduced.

Perhaps the most radical change is the blurring of boundaries. The new process architecture rejects the traditional “series of boxes” (Reactor → Separator → Dryer).

Result: A single “unit” now performs the work of three, reducing capital expenditure (CAPEX), waste, and energy.

To understand what makes the unit operation process new, we must first acknowledge the limitations of the old.

In traditional manufacturing, a chemical plant operates as a linear sequence of unit operations. For example:

Each unit operates with its own PID controller, local sensors, and manual oversight. The classical approach assumes that if each unit performs optimally in isolation, the whole process will be optimal. This is decentralized control, and it suffers from:

The "new" unit operation process dismantles these silos.