Structured packing can reduce weight, column height, liquid inventory and pressure drop in FPSO and floating offshore columns. However, roll, pitch, heave and permanent tilt can disturb distributor liquid levels, create side-to-side maldistribution and produce local flooding even when average tower load is acceptable. Packing geometry, compartmented distribution, wall-flow control, support grids, hold-down devices, segment locking, transport loads and offshore installation access must be evaluated using the vessel’s actual motion and acceleration basis.

Structured packing can improve batch distillation through high separation efficiency, low pressure drop and low liquid holdup. Low holdup reduces intermediate-composition liquid retained between product cuts, improving cut sharpness and recoverable yield. Packing and liquid distributors must also perform across changing vapor and reflux rates. Multipurpose plants should evaluate cross-contamination, drainability, cleaning chemistry, validation requirements, small-column wall effects and total system holdup—not only packing HETP.

Structured packing can improve dividing-wall-column performance through high separation efficiency, low pressure drop and low liquid holdup. However, each side of the dividing wall must be treated as a separate hydraulic zone. Vapor and liquid split, compartment-specific distributors, packing-to-wall sealing, wall flow, support-grid resistance, thermal expansion and installation sequence must all be controlled. Small gaps or unequal pressure drop can cause bypass, internal flow redistribution and unstable middle-product purity.

Structured packing can improve seawater vacuum deaeration by providing high oxygen-transfer efficiency with low pressure drop. Selection must account for seasonal water temperature, vacuum level, liquid distribution, chloride corrosion, mineral scale, biofouling and suspended solids. Plastic or metallic packing materials require application-specific compatibility review, while supports, mist eliminators and distributors must be evaluated as part of the same system. Air leakage should always be checked when outlet oxygen increases.

Structured packing can improve acrylonitrile recovery and purification through high separation efficiency, low pressure drop and low liquid holdup. Packing selection must account for HCN separation, acetonitrile by-product recovery, acrylonitrile polymerization, inhibitor distribution, catalyst fines, salts and heavy residues. High-efficiency structured packing is best suited to clean purification sections, while dirty quench or heavy-bottom duties may require more fouling-tolerant internals.