Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C7/00—Purification; Separation; Use of additives
  • C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
  • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
  • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
  • C10G9/34—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts
  • C10G9/36—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts with heated gases or vapours
  • C10G9/38—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts with heated gases or vapours produced by partial combustion of the material to be cracked or by combustion of another hydrocarbon
• • 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
  • Y10S585/00—Chemistry of hydrocarbon compounds
  • Y10S585/8995—Catalyst and recycle considerations
  • Y10S585/903—Catalyst and recycle considerations with hydrocarbon recycle to control synthesis reaction, e.g. by cooling, quenching

Definitions

• acetylene can be produced by thermal conversion of hydrocarbons, for example by partial oxidation of hydrocarbons (particularly methane or light naphtha) with oxygen in a flame reaction.
• the cracked gas containing about 10% of acetylene which is at a temperature of about 1500" C. must be cooled very rapidly and the conventional way of achieving this is by spraying in a suitable liquid.
• hot cracked gas containing acetylene may be quenched with water.
• the use of water has the disadvantage however that the heat given up by the hot cracked gas cannot be utilized and is thus lost.
• the cracked gas contain ing acetylene may be quenched with high boiling point aromatic hydrocarbon oils.
• high boiling point aromatic hydrocarbon oils In this way it is possible to make use of the whole of the heat energy contained in the cracked gas and to remove the carbon black from the gas in a simple and effective way.
• hydrocarbon oils do not quench the hot cracked gas as rapidly, intensely and uniformly as water. If acetylene remains too long in the region of high temperature, however, it decomposes into carbon black and hydrogen so that the acetylene yield decreases whereas the undesirable formation of carbon black increases.
• hydrocarbon oils which are obtainable commercially for example as fuel oils, have greatly differing compositions and therefore different properties. For this reason each hydrocarbon oil must be thoroughly investigated prior to use, and this is not only time-consuming but also expensive.
• Naphthalene is 3,287,435 Patented Nov. 22, 1966 ice therefore particularly well suited for a regeneration process, i.e. a portion of the naphthalene may be continually withdrawn from the liquid cycle and freed from carbon black.
• the naphthalene freed from carbon black is used again for quenching either alone or mixed with naphthalene containing carbon black. It is advantageous to free just suflicient naphthalene from carbon black to ensure that a constant content of carbon black is maintained in the recycled naphthalene, for example at a level of 10 to 30%, particularly 20%.
• naphthalene contrasted with other hydrocarbon oils, is free from sulfur. It is quite a special advantage of the process according to this invention that naphthalene is a defined chemical substance and as such is obtainable always in the same quality.
• the portion of the naphthalene which evaporates during the quenching is advantageously condensed in a conventional way in a column by means of a low boiling point aromatic hydrocarbon oil and passed through the bottom of the column to the quenching zone in .a chemically unchanged form, while the light hydrocarbon oil evaporates, is condensed in a condenser and separated from water in a separating vessel. There are no deposits or incrustations in the condensation column, even after prolonged periods of operation, whereas when using aromatic oils as quenching liquids, the lower portion of the column becomes soiled and this may lead to interruptions in the operation.
• naphthalenes having a halogen atom as substituent in a-position as for example a-chloronaphthalene, have the same advantageous properties as naphthalene itself.
• Example 370 kg. per hour of gasoline is heated to 350" C. in a preheater and 250 cubic meters (S.T.P.) of oxygen per hour is preheated to 350 C. in a second preheater.
• the mixture is converted into cracked gas containing acetylene in a combustion chamber.
• the hot cracked gas is quenched in one case with a high boiling point aromatic oil and in another case with naphthalene.
• the cracked gas at 180 C. which has been quenched with the aromatic oil contains 9.5% by volume of acetylene and mg.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Water Supply & Treatment (AREA)
• Analytical Chemistry (AREA)
• Combustion & Propulsion (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Pigments, Carbon Blacks, Or Wood Stains (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6976781

Family Applications (1)

Country Status (6)

Citations (4)

• 1963
  • 1963-02-16 DE DEB70767A patent/DE1185174B/de active Pending
• 1964
  • 1964-01-21 US US339083A patent/US3287435A/en not_active Expired - Lifetime
  • 1964-01-24 GB GB3109/64A patent/GB1047045A/en not_active Expired
  • 1964-02-14 AT AT124164A patent/AT243770B/de active
  • 1964-02-14 NL NL6401345A patent/NL6401345A/xx unknown
  • 1964-02-14 BE BE643840D patent/BE643840A/xx unknown

Patent Citations (4)

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