Title:
METHOD OF AND APPARATUS FOR DECOMPOSING LOW QUALITY MATERIALS
Document Type and Number:
WIPO Patent Application WO/1990/002783
Kind Code:
A1
Abstract:
A method of and an apparatus for decomposing a low quality material by withdrawing a low quality material, which contains a large quantity of heavy fractions, such as a high boiling point fraction and an evaporation residual fraction, from an intermediate portion of a preheater of a cracking furnace which is used to thermally decompose this material, removing heavy fractions from the low quality material by a gas-liquid separator until the heavy fraction content of the material reaches a required level, and then returning the resultant low quality material to the preheater to generate a thermal decomposition reaction. Such method and apparatus are adapted to thermally decompose a low quality material from which such heavy fractions as mentioned above are removed until the heavy fraction content of the low quality material reaches a predetermined level, so that a conduit in this apparatus is prevented from being clogged. Since these method and apparatus are capable of preventing the occurrence of a pressure loss in the conduit in the apparatus and an increase of the temperatures at the outlets of the preheater and a heat exchanger, a thermal decomposition operation can be carried out continuously for a long period of time. In addition to the above, a method of and an apparatus for decomposing a low quality material, including the step of introducing a required quantity of superheated dilution steam into the low quality material withdrawn from an intermediate portion of a preheater, are capable of controlling the quantity of heavy fractions to be removed, by varying the evaporation rate of the low quality material, so that even the low quality materials of different places of production can also be treated sufficiently under the same treatment conditions by the same treatment apparatus.
Inventors:
YOSHIDA MASAHIKO (JP)
KITAYAMA YUTAKA (JP)
IIDA TSUKASA (JP)
KITAYAMA YUTAKA (JP)
IIDA TSUKASA (JP)
Application Number:
PCT/JP1989/000908
Publication Date:
March 22, 1990
Filing Date:
September 04, 1989
Export Citation:
Assignee:
MITSUI PETROCHEMICAL IND (JP)
International Classes:
C10G9/00; C10G9/14; C10G9/20; C10G55/04; (IPC1-7): C10G9/00; C10G55/04
Foreign References:
| JPS5328402B1 | 1978-08-15 | |||
| JPS6072989A | 1985-04-25 | |||
| EP0079124A2 | 1983-05-18 |
Other References:
See also references of EP 0427854A4
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