Kureha Kagaku Kogyo Kabushiki Kaisha

Chiyoda Chemical Engineering Construction Co., Ltd.

Shoichi Motokawa

Masatomo Shigeta

Hiroshi Hozuma

Tomizo Endo

Masaharu Tomizawa

Hideo Kikuchi

Yutaka Sumida

Keiji Nagayama

Masaichi Ohtake

Toru Kawahara

Takao Ishihara

Kiyoji Sanpei

Hiroshi Nabatame

In a process for the thermal cracking of a heavy hydrocarbon in a cylindrical reactor, a portion of the content material in the reactor is taken out and injected back into the reactor according to a specific procedure to form a 'wet wall' or liquid curtain on the inner peripheral wall of the reactor, thereby preventing coking in the reactor. The apparatus includes a radially outwardly extending interior annular recess around an upper portion of the inner wall thereof and forming a part of said inner wall and plural means for tangentially injecting the recycled liquid into said recess.

Apparatus for the thermal cracking of heavy hydrocarbon

In a process for the thermal cracking of a heavy hydrocarbon in a cylindrical reactor, a portion of the content material in the reactor is taken out and injected back into the reactor according to a specific procedure to form a 'wet wall' or liquid curtain on the inner peripheral wall of the reactor, thereby preventing coking in the reactor.

Method for the thermal cracking of heavy hydrocarbon

A demister is disclosed containing a plurality of bubble-cap trays and a plurality of sieve trays beneath the bubble-cap trays and arranged so that the distance between the uppermost sieve tray and the bottom surface of the lower-most bubble-cap tray is at least twice the distance between adjoining sieve trays. A spray nozzle for washing the bottom surface of the lowermost sieve tray with a cleaning oil is also provided.

Apparatus and method for removing pitch from thermally cracked gas

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Iwaki, Japan

Shoichi Motokawa