IPC Subclass
F25J LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
Introduced: September 1968
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
- Subclass:
- LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
Description
F25J covers apparatus and processes for liquefying, solidifying, or separating gases and gaseous mixtures through combined application of pressure and low-temperature treatment. This subclass encompasses cryogenic separation technologies including rectification columns, heat exchangers, expansion devices, and complete liquefaction plants for industrial gases such as nitrogen, oxygen, argon, and natural gas. The classification includes both the refrigeration systems and mechanical equipment necessary to achieve the required pressure-cold conditions, as well as methods for air separation and purification of gas streams.
Related Keywords
liquefaction, solidification, or separation of gases by pressure and COLD treatmentliquefaction, solidification, or separation of GAS(ES) by pressure and cold treatmentLIQUEFACTION of gases by pressure and cold treatmentSEPARATING of gaseous mixtures by pressure and cold treatmentSOLIDIFYING of gases by pressure and cold treatment
3 direct subcodes
Child Classifications
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- F25J 1/00 Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J 3/00 Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification
- F25J 5/00 Arrangements of cold-exchangers or cold-accumulators in separation or liquefaction plants