Heat pumps in chemicals and pharmaceuticals

A wide range of duties

These sectors include clean hot water, drying, distillation, evaporation and thermal control. Some duties fall within commercial heat-pump temperatures while others require steam or much higher heat.

Process constraints lead

Materials compatibility, hazardous-area classification, containment, validation and product change control can outweigh energy considerations. Heat exchange boundaries must be agreed with process and safety teams.

Distillation and evaporation

Mechanical vapour recompression can be highly effective when reusable vapour is available. It is a process-specific form of heat pumping and should be assessed using the actual vapour composition and pressure.

Define the process boundary before the energy case

Clean utilities, reactor temperature control, evaporation, distillation and drying create very different heat-pump duties. Separate indirect utility heating from product-contact service and record pressure, composition, purity and batch requirements for every candidate stream.

Hazardous-area classification, refrigerant charge, materials compatibility and containment can restrict equipment location and exchanger design. Validation and change control may also govern the programme. These are concept-selection inputs rather than late compliance checks.

Consider vapour compression where vapour already exists

Mechanical vapour recompression can raise the pressure and condensation temperature of a reusable process vapour. It can offer a smaller lift than transferring heat through a closed cycle, particularly in evaporation and distillation. Suitability depends on vapour composition, entrained liquid, corrosion and compressor limits.

Where a closed-cycle heat pump is used, request performance across the batch profile and any required intermediate loops. The study should identify how off-spec operation, cleaning, startup and equipment failure are handled without compromising the validated process.