CPC Subclass Not Allocatable
F25J 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.
17 direct subcodes
Child Classifications
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- F25J 1/00 Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J 2200/00 Processes or apparatus using separation by rectification
- F25J 2205/00 Processes or apparatus using other separation and/or other processing means
- F25J 2210/00 Processes characterised by the type or other details of the feed stream
- F25J 2215/00 Processes characterised by the type or other details of the product stream
- F25J 2220/00 Processes or apparatus involving steps for the removal of impurities
- F25J 2230/00 Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J 2235/00 Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J 2240/00 Processes or apparatus involving steps for expanding of process streams
- F25J 2245/00 Processes or apparatus involving steps for recycling of process streams
- F25J 2250/00 Details related to the use of reboiler-condensers
- F25J 2260/00 Coupling of processes or apparatus to other units; Integrated schemes
- F25J 2270/00 Refrigeration techniques used
- F25J 2280/00 Control of the process or apparatus
- F25J 2290/00 Other details not covered by groups F25J2200/00 - F25J2280/00
- 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 (heat exchangers F28C, F28D, F28F)