Derwent Classification System: Chemical Engineering

Unit processes and/or plant for general application in chemical industries are included in this section, but processes and apparatus for specific applications are excluded.

Approximate IPCs are given in brackets.

J01 Separation - including evaporation, crystallisation, solvent extraction, chromatography, dialysis, osmosis including drying gases and/or vapours, and separation of solids from gases, liquids and other solids. Isotope separation, filter materials (including molecular sieves for separation), and centrifuges (except where used for analysis) (B01D, B03, B04, B07B).
J02 Mixing and including dispersing,
J03 Electrochemical processes and electrophoresis - including ozone production, brine electrolysis, water electrolysis, production of chemical compounds and non-metallic elements, but excluding batteries or other means of producing power and the treatment of metals (C25B).
J04 Chemical/physical processes/ apparatus - including catalysis, catalysts (excluding specific eg enzymatic or polymerisation catalysts), colloid chemistry, laboratory apparatus and methods, testing, controlling, general encapsulation, detection and sampling (excluding clinical testing) (B01J, L).
J05 Boiling and boiling apparatus - including generation of steam unless for power plant (B01B).
J06 Storing or distributing gases or liquids - including gas holders, vessels for gases, decantation and vaporisation of gases, pipelines and pipe systems, but excluding those for hydrocarbon gases or liquids and laying of pipelines (F17).
J07 Refrigeration; ice; gas liquefaction/solidification - including machines, freezing of (semi)liquids, gas separation/ liquefaction by cooling or pressure, fractionation of air (F25).
J08 Heat transfer and drying - including direct/indirect heat exchangers, heat transfer apparatus, drying processes (F26, F28).
J09 Furnaces, kilns, ovens, retorts including furnace constructional details and accessories, but only where of general application (F27).