US3091941A - Process and apparatus for refrigeration by work-producing expansion - Google Patents

Process and apparatus for refrigeration by work-producing expansion Download PDF

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Publication number
US3091941A
US3091941A US742319A US74231958A US3091941A US 3091941 A US3091941 A US 3091941A US 742319 A US742319 A US 742319A US 74231958 A US74231958 A US 74231958A US 3091941 A US3091941 A US 3091941A
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Prior art keywords
gas
regenerator
expansion
heat storing
arrangement
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US742319A
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English (en)
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Becker Rudolf
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Linde GmbH
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Gesellschaft fuer Lindes Eismaschinen AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/24—Processes or apparatus using other separation and/or other processing means using regenerators, cold accumulators or reversible heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/10—Mathematical formulae, modeling, plot or curves; Design methods
    • 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
    • Y10S62/908—Filter or absorber
    • 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
    • Y10S62/909—Regeneration

Definitions

  • the invention concerns a process and a device for refrigeration by work-producing expansion of a gas (or, gas mixture) which is cooled to a low temperature by means of a regenerator arrangement and thereafter liberated from the condensation products.
  • the present invention relates in particular to the fact that the refrigeration is effected in connection with a gas separation, which is preferably carried out by low-temperature rectification.
  • a gas separation which is preferably carried out by low-temperature rectification.
  • the gas to be expanded generally must be heated again before it enters the expansion machine.
  • special heating coils were used in the regenerator for this purpose, but this expedient reduces the efiiciency of the regenerator.
  • Another known possibility was to branch off from the regenerator, at a central point, a partial gas current which had not yet been cooled to the eventual extent, and to use the partial gas current again for work-producing expansion. In this latter case the gas had to be purified additionally by means of adsorbers.
  • the object of the present invention is to eliminate the above described disadvantages and to heat the gas flowing to the expansion machine with a good efiiciency of the regenerator and without any special complications.
  • the problem involved in refrigeration by Work-producing expansion of a gas (or, gas mixture) cooled to a low temperature by a regenerator arrangement and liberated from the condensation products, e.g., carbon dioxide, Water and the like, which gas (or, gas mixture) is heated before the expansion, is solved by the application of an additional regenerator, preferably interposed in the reversing operation of the regenerator arrangement, as a heat source for heating the gas or gas mixture respectively.
  • an additional regenerator preferably interposed in the reversing operation of the regenerator arrangement, as a heat source for heating the gas or gas mixture respectively.
  • a part of the crude gas is branched off behind the regenerator arrangement, is conducted through the additional regenerator to be heated therein, and is fed to the expansion device.
  • the expansion device used may be, and preferably is, an expansion turbine.
  • Another realization of the inventive concept consists essentially in that a separated component of the crude gas, obtained in a gas separating devicein particular, a rectifying column arrangement-is conducted entirely or partly through the additional regenerator and then is fed to the expansion device (e.g., turbine).
  • the expansion device e.g., turbine
  • the gas preheated in the above described manner according to the invention, can-unless it is used completely and exclusively for the refrigeratiOn-be' added to another gas having a diiferent, preferably lower, temperature before it is introduced into the work-producing expansion device; or, it can be used for the indirect heating of a gas to be expanded.
  • FIG. 1 is a schematic representation of a plant, embodying principles of the present invention, for the separation of nitrogen and oxygen from air and illustrating the expansion of a crude gas through an expansion turbine;
  • FIG. 2 is a schematic representation of a similarly constituted plant for air rectification, showing a modification wherein one of the separated gases, rather than the crude gas, is expanded through the turbine.
  • 1, 2, 3 and 4 designate two pairs of regenerators through which compressed air is conducted, in known manner, from a compressor 21, for cooling and cleaning.
  • a two-stage rectifying column into which is introduced the air issuing from the regenerator arrangement at 6.
  • the air traverses the regenerators 1 and 3, while the regenerators 2 and 4 are being traversed by the separation products.
  • Nitrogen is taken from the head of the column at '7 and issues at 8.
  • Oxygen is taken from the column 5 at outlet 9 and issues from the apparatus at 10.
  • the sump liquid of the pressure stage of column 5 is expanded, by way of line 22, into the upper, pressureless stage, while liquid compressed nitrogen flows through line 23 into the pressure-less stage of the column.
  • an additional regenerator 11 is provided, which additional component is included in the reversing cycle of the valves indicated by the usual symbols.
  • a part of the pre-cleaned air is first branched oil from column 5 at outlet 12, then conducted by means of lines 13 and 14, to and from the cold end of the regenerator ill for heating, followed by expansion in a known manner through air expansion turbine 15 and finally introduced at outlet 1-6 into the rectifying column arrangement in order to meet the cooling requirements of the separating apparatus.
  • the reversal of the re generators 1, 2 and 11 is so effected that each individual regenerator is first traversed by crude gas, then scavenged by the separation component, and finally used for heating the turbine gas.
  • FIG. 2 shows by way of example a modified form, wherein not the crude gas (e.g., air) but rather one separation product thereof, particularly nitrogen, is expanded in the expansion turbine.
  • the reference numbers are the same as in FIG. 1 for the identical parts.
  • the air flow through the regenerators 1 and 3 is the same as in FIG. 1. However, in the present case all the air is introduced into the rectifying column 5 at outlet 6.
  • nitrogen is taken from the head of the lower column at outlet 17 and is conducted through the expansion tur-bine 15, after which it flows in the represented valve position through the regenerator 2.
  • the heating of the turbine nitrogen is effected, according to this aspect of the invention, by means of a heat exchanger 18 which latter is traversed by a nitrogen current taken from the column 5 at outlet 7 and conducted, by way of lines 19 and 20, through the cold end of the regenerator 11 in order to be heated.
  • regenerator 1L1 can be used, if the circumstances make the same advantageous, at the same time to produce a product of higher purity.
  • separate outlets for nitrogen are provided in the regenerators 2 and 1121s indicated, for example,in FIG. 2.
  • the method of heating the compressed gas in an arrangement of at least three cyclically alternated 'regenerators having heat storing masses before the work performing expansion of the gas which comprises:
  • the method of heating the compressed gas in an arrangement of at least three cyclically alternated regenerators having heat storing masses before the work performing expansion which comprises:
  • the method of heating the compressed gas in an arrangement of at least three cyclically alternated regenerators having heat storing masses before the work performing expansion which comprises:
  • Apparatus for refrigeration by means of the Work performing expansion of a gas in a low temperature system comprising an arrangement of at least three cyclically alternated regenerators, each regenerator including a heat storing mass and having only one steam-conducting cross section and an outlet between its entrance and its exit ends, valved conduit means for leading the gas to be expanded through a first of said regenerators from the warm to the cold end thereof, to cool the gas and to condense contaminants, valved conduit means for leading a scavenging gas through a second of said regenerators from the cold to the warm end in direct contact With the heat storing mass thereof to remove a substantial part of the con densed contaminants from the heat storing mass thereof, valved conduit means for leading the gas to be expanded from the cold end of said first regenerator to the cold end of a third of said regenerators, valved conduit means for leading the gas to be expanded through at least a part of said third regenerator from the cold end thereof to said outlet between the entrance and the exit ends thereof and from said outlet directly to an expansion engine to 7 Warm and expand
  • Apparatus as defined in claim 5 comprising a two stage rectifying device, conduit means for leading at least a part of a cooled and cleaned gas mixture from the cold end of the first regenerator to the foot of a high pressure column of said rectifying device, conduit means for leading an expanded gas mixture from the exit of the expansion engine to a low pressure column of said rectifying device, conduit means for leading a separating fraction as the scavenging gas from the top of the low pressure column to the cold end of the second regenerator.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)
US742319A 1957-07-04 1958-06-16 Process and apparatus for refrigeration by work-producing expansion Expired - Lifetime US3091941A (en)

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Application Number Priority Date Filing Date Title
DEG22464A DE1046640B (de) 1957-07-04 1957-07-04 Verfahren und Einrichtung zur Kaelteerzeugung durch arbeitsleistende Entspannung

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BE (1) BE567653A (da)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274789A (en) * 1965-03-26 1966-09-27 Air Reduction Process for removing congealed impurities from a gas expander
US4414007A (en) * 1981-08-31 1983-11-08 United States Steel Corporation Process for separation of gas mixture
US4480444A (en) * 1983-05-23 1984-11-06 Alsthom-Atlantique Deep mine cooling system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1065867B (de) * 1957-07-04 1960-03-31 Gesellschaft für Linde's Eismaschinen Aktiengesellschaft, Zweigniederlassung, Höllriegelskreuth bei München Verfahren und Einrichtung zur Durchführung von Wärmeaustauschvorgängen in einer mit vorgeschalteten Regeneratoren arbeitenden Gaszerlegungsanlage,·
US3089311A (en) * 1959-12-21 1963-05-14 Linde Eismasch Ag Regenerative heat-transfer process
DE1143526B (de) * 1962-01-12 1963-02-14 Linde Eismasch Ag Verfahren und Einrichtung zur Tieftemperatur-Gaszerlegung, insbesondere Luftzerlegung

Citations (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1968518A (en) * 1932-09-10 1934-07-31 Linde Air Prod Co Method and apparatus for liquefying and separating gaseous mixtures
US2071763A (en) * 1930-03-10 1937-02-23 Union Carbide & Carbon Corp Process for the separation of gas mixtures
US2084334A (en) * 1933-02-01 1937-06-22 American Oxythermic Corp Process for the resolution of gaseous mixtures
US2603956A (en) * 1949-05-05 1952-07-22 Linde S Eismachinen A G Ges Process of and apparatus for the purification of air
US2648205A (en) * 1948-03-30 1953-08-11 Hydrocarbon Research Inc Rectification of mixed gases
CA498441A (en) * 1953-12-15 Etienne Alfred Process for liquefaction and possible separation of gases
US2699047A (en) * 1950-10-27 1955-01-11 Linde Eismasch Ag Process for cooling and purifying compressed gas mixtures
US2715820A (en) * 1950-11-30 1955-08-23 Becker Rudolf Method for the separation of gas mixtures
US2716332A (en) * 1950-04-20 1955-08-30 Koppers Co Inc Systems for separating nitrogen from natural gas
US2737784A (en) * 1953-12-24 1956-03-13 Linde Eismasch Ag Apparatus for obtaining liquid oxygen
US2763137A (en) * 1951-07-10 1956-09-18 Joy Mfg Co Apparatus for and method of separating gases
US2765637A (en) * 1950-10-30 1956-10-09 Air Liquide Frigorific separation process of gas mixture by liquefying and rectifying
US2788646A (en) * 1953-03-24 1957-04-16 Union Carbide & Carbon Corp Process of and apparatus for lowtemperature separation of air
US2825212A (en) * 1950-03-25 1958-03-04 Linde Eismasch Ag Process for separating a compressed gas mixture
US2850880A (en) * 1955-01-05 1958-09-09 Linde Eismasch Ag Process and an apparatus for the separation of compressed air
US2863295A (en) * 1955-07-19 1958-12-09 Herrick L Johnston Inc Process for separating a gas mixture into its components
US2866321A (en) * 1954-08-06 1958-12-30 Chemical Construction Corp Purification of gases by partial condensation
US2895304A (en) * 1955-06-02 1959-07-21 Linde Eismasch Ag Process and apparatus for gas purification
US2915880A (en) * 1955-05-12 1959-12-08 British Oxygen Co Ltd Separation of gas mixtures
US2918801A (en) * 1955-10-10 1959-12-29 Union Carbide Corp Process and apparatus for separating gas mixtures
US2924078A (en) * 1954-06-08 1960-02-09 American Messer Corp Process and apparatus for producing liquid oxygen
US2955434A (en) * 1956-10-15 1960-10-11 Air Prod Inc Method and apparatus for fractionating gaseous mixtures
FR1233248A (fr) * 1958-08-01 1960-10-12 Petrocarbon Dev Ltd Perfectionnements apportés aux procédés de récupération de gaz non condensables
DE1106784B (de) * 1960-04-14 1961-05-18 Linde Eismasch Ag Verfahren und Einrichtung zum Temperaturausgleich vor Kaltgasturbinen

Patent Citations (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA498441A (en) * 1953-12-15 Etienne Alfred Process for liquefaction and possible separation of gases
US2071763A (en) * 1930-03-10 1937-02-23 Union Carbide & Carbon Corp Process for the separation of gas mixtures
US1968518A (en) * 1932-09-10 1934-07-31 Linde Air Prod Co Method and apparatus for liquefying and separating gaseous mixtures
US2084334A (en) * 1933-02-01 1937-06-22 American Oxythermic Corp Process for the resolution of gaseous mixtures
US2648205A (en) * 1948-03-30 1953-08-11 Hydrocarbon Research Inc Rectification of mixed gases
US2603956A (en) * 1949-05-05 1952-07-22 Linde S Eismachinen A G Ges Process of and apparatus for the purification of air
US2825212A (en) * 1950-03-25 1958-03-04 Linde Eismasch Ag Process for separating a compressed gas mixture
US2716332A (en) * 1950-04-20 1955-08-30 Koppers Co Inc Systems for separating nitrogen from natural gas
US2699047A (en) * 1950-10-27 1955-01-11 Linde Eismasch Ag Process for cooling and purifying compressed gas mixtures
US2765637A (en) * 1950-10-30 1956-10-09 Air Liquide Frigorific separation process of gas mixture by liquefying and rectifying
US2715820A (en) * 1950-11-30 1955-08-23 Becker Rudolf Method for the separation of gas mixtures
US2763137A (en) * 1951-07-10 1956-09-18 Joy Mfg Co Apparatus for and method of separating gases
US2788646A (en) * 1953-03-24 1957-04-16 Union Carbide & Carbon Corp Process of and apparatus for lowtemperature separation of air
US2737784A (en) * 1953-12-24 1956-03-13 Linde Eismasch Ag Apparatus for obtaining liquid oxygen
US2924078A (en) * 1954-06-08 1960-02-09 American Messer Corp Process and apparatus for producing liquid oxygen
US2866321A (en) * 1954-08-06 1958-12-30 Chemical Construction Corp Purification of gases by partial condensation
US2850880A (en) * 1955-01-05 1958-09-09 Linde Eismasch Ag Process and an apparatus for the separation of compressed air
US2915880A (en) * 1955-05-12 1959-12-08 British Oxygen Co Ltd Separation of gas mixtures
US2895304A (en) * 1955-06-02 1959-07-21 Linde Eismasch Ag Process and apparatus for gas purification
US2863295A (en) * 1955-07-19 1958-12-09 Herrick L Johnston Inc Process for separating a gas mixture into its components
US2918801A (en) * 1955-10-10 1959-12-29 Union Carbide Corp Process and apparatus for separating gas mixtures
US2955434A (en) * 1956-10-15 1960-10-11 Air Prod Inc Method and apparatus for fractionating gaseous mixtures
FR1233248A (fr) * 1958-08-01 1960-10-12 Petrocarbon Dev Ltd Perfectionnements apportés aux procédés de récupération de gaz non condensables
DE1106784B (de) * 1960-04-14 1961-05-18 Linde Eismasch Ag Verfahren und Einrichtung zum Temperaturausgleich vor Kaltgasturbinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274789A (en) * 1965-03-26 1966-09-27 Air Reduction Process for removing congealed impurities from a gas expander
US4414007A (en) * 1981-08-31 1983-11-08 United States Steel Corporation Process for separation of gas mixture
US4480444A (en) * 1983-05-23 1984-11-06 Alsthom-Atlantique Deep mine cooling system

Also Published As

Publication number Publication date
NL111519C (da) 1965-07-15
DE1046640B (de) 1958-12-18
BE567653A (da) 1960-08-12
NL228122A (da)

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