Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B7/00—Halogens; Halogen acids
  • C01B7/01—Chlorine; Hydrogen chloride
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S62/00—Refrigeration
  • Y10S62/902—Apparatus
  • Y10S62/903—Heat exchange structure
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S62/00—Refrigeration
  • Y10S62/921—Chlorine

Definitions

• the present invention relates to a process for the condensation of hydrogeneous chlorine gas.
• Cell chlorine from plants which decompose aqueous solutions of alkali metal chlorides contains always certain amounts of CO H and N
• the gases which are uncondensable under the pressure and temperature conditions of the chlorine condensation, appear in cell chlorine in a proportion of l2% dependent on the process applied and the operating conditions in modern plants, but the proportion of these gases in cell chlorine may be considerably greater when the process used is disturbed or when the plants are in poor condition.
• the gas used as starting material has been produced electrolytically by the mercury process, it is found in a 90% condensation that the residual gas normally contains already about 4% of H which is said to be the tolerable upper limit for a nonexplosive character of the escaping gas mixture.
• a further disadvantage of the known process resides in the fact that it is carried out under a relatively high pressure, for example under a pressure of 1.26 atmospheres gauge in the first stage and under a pressure of 3.85 atmospheres gauge in the second stage of the process, and an error in dosing the air gives rise easily to an ignition of the gas mixture in the second stage.
• the known process is further complicated in that the air must be carefully dried prior to being used for dilution.
• chlorine gas is forced into a coolingdevice by means of a conveyor, wherein the condensation is carried out in various stages, preferably in two stages, provided the chlorine gas is condensed in the first stage or first stages by means of a cooler of known design so that the evolution of explosive residual gas is avoided and provided that the chlorine is condensed in the second or following cooling stages, for example to an extent of more than 99.5 to evolve explosive residual gas, the latter stages being so designed that the gas is distributed into smallest spaces for condensation.
• Chlorine is compressed in one stage and cooled in at least two stages, the pressure and temperature applied being so selected that the chlorine is condensed in the first cooling stage or cooling stages to evolve a residual gas the hydrogen content of which is below the explosion limit, that is below 4%.
• the chlorine is cooled to so low a temperature that more than 99.5% of the chlorine used is liquefied.
• the residual gas evolved has an explosive character.
• the gas chambers are so narrowly designed that at a local ignition the dissipation of the heat evolved takes place so rapidly that the explosion wave cannot expand.
• nonreturn valves of suitable design are inserted between the first and second stages or the following stages which contain nonexplosive and explosive residual gas.
• the coolers used in the second stage or the stages with explosive residual gas may be of various types. There may be employed, for example, a bundle of very narrow tubes or narrow annular spaces may be formed in more spacious tubes by means of replacement bodies.
• the cooling spaces may be filled with bodies which are in a good heat-conducting contact with the cooled walls and distribute the gas to be condensed into small units of volume.
• the purifying apparatus is shifted towards the side of dry chlorine.
• purification may be brought about by means of a mechanical or electrostatic filter.
• Example Chlor ne from a mercury cell plant of the following composition 98.8 percent by volume of chlorine 0.6 percent by volume of CO 0.4 percent by volume of H 0.2 percent by volume of N +O was compressed to a total pressure of 2.5 atmospheres absolute.
• the first stage was cooled to a temperature of Patented July 10, 1962 20 6.; about 90% of The residual gas had the following composition:
• a process for condensing hydrogen-containing chlorine gas which comprises cooling said gas in a first stage, while under superatmospheric pressure, to a temperature the chlorine was liquefied.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Separation By Low-Temperature Treatments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7091047

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (2)

• 0
  • BE BE571213D patent/BE571213A/xx unknown
• 1957
  • 1957-09-14 DE DEF23957A patent/DE1056155B/de active Pending
• 1958
  • 1958-09-12 US US760564A patent/US3043111A/en not_active Expired - Lifetime
  • 1958-09-15 FR FR1202578D patent/FR1202578A/fr not_active Expired

Patent Citations (2)

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