F25J LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
Introduced: September 1968
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.
Title
Titles differ between systems:
IPC: LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
CPC: LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
Full Title
Full titles differ between systems:
LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
CPC subdivides this area 6x more granularly than IPC with 14 additional codes.
14 codes are CPC-only extensions.
Note: 14 CPC extensions are marked as secondary classification only.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F25J 1/00 Processes or apparatus for liquefying or solidifying gases or gaseous mixtures +3 CPC IPC+CPC Available in IPC and CPC
- F25J 2200/00 Processes or apparatus using separation by rectification 2nd only +18 CPC CPC only CPC only
- F25J 2205/00 Processes or apparatus using other separation and/or other processing means 2nd only +13 CPC CPC only CPC only
- F25J 2210/00 Processes characterised by the type or other details of the feed stream 2nd only +17 CPC CPC only CPC only
- F25J 2215/00 Processes characterised by the type or other details of the product stream 2nd only +19 CPC CPC only CPC only
- F25J 2220/00 Processes or apparatus involving steps for the removal of impurities 2nd only +10 CPC CPC only CPC only
- F25J 2230/00 Processes or apparatus involving steps for increasing the pressure of gaseous process streams 2nd only +16 CPC CPC only CPC only
- F25J 2235/00 Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams 2nd only +9 CPC CPC only CPC only
- F25J 2240/00 Processes or apparatus involving steps for expanding of process streams 2nd only +7 CPC CPC only CPC only
- F25J 2245/00 Processes or apparatus involving steps for recycling of process streams 2nd only +6 CPC CPC only CPC only
- F25J 2260/00 Coupling of processes or apparatus to other units; Integrated schemes 2nd only +9 CPC CPC only CPC only
- F25J 2290/00 Other details not covered by groups F25J2200/00 - F25J2280/00 2nd only +17 CPC CPC only CPC only
- F25J 3/00 Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification IPC+CPC Available in IPC and CPC
- F25J 5/00 Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants (heat exchangers F28C, F28D, F28F) +1 CPC IPC+CPC Available in IPC and CPC