Chiyoda Corporation

Fuji Oil Company Limited

Mitsubishi Chemical Corporation

Nippon Steel Chemical Co., Ltd.

Makoto Nomura

Susumu Yamamoto

Keiji Maehara

Sachio Asaoka

Nobuo Moriya

Kouji Sakashita

Katsuhiko Sakura

Kenichi Mimura

Keiji Shimoda

Munenori Maekawa

Toshihiko Furukawa

Nobuyuki Suda

Masanori Nagase

Yoshiaki Matsui

Tsohikazu Maruyama

Tadayoshi Matsuo

Takamasa Minami

Hiroshi Yanai

Kenji Nagahama

Atsumi Kukidome

Katsunori Yagi

Naoko Suzuki

Hisao Takeuchi

Isao Shibutani

Atsushi Tamagawa

The present invention relates to a process for thermal cracking of heavy petroleum oil, in which when a thermal cracking facility having a cracking furnace, two or more of trains each comprising two reaction vessels and one distillation tower is operated, each train is operated by repeating a cycle comprising drawing the heavy petroleum oil from the cracking furnace, feeding the drawn heavy petroleum oil into the first reaction vessel and then feeding the drawn heavy petroleum oil into the second reaction vessel, steam is directly brought in contact with the heavy petroleum oil to be thermally cracked, and gaseous cracked substances produced and steam are introduced into the distillation tower to be distilled and separated, wherein phase delay is provided for the cycle repeated in each train so that the thermal cracking facility is operated with the different initiation time of feeding to the first reaction vessel in each train. According to the present invention, the instability of the flow-in quantity of the gaseous substances to the distillation tower is improved, and the improvement of separation performance, the increase of processing capacity of the facility and the like can be achieved.

Thermal cracking process and facility for heavy petroleum oil

The suppression of coke adherence in a reaction vessel and cracked gas pipelines at the outlet of the reaction vessel and the prevention of plugging are designed by improving the dispersion of superheated steam inside the reaction vessel to preferable conditions, and pitch having more uniform and higher quality can be produced. A cracking process in which superheated steam is directly contacted with the heavy petroleum oil by blowing the superheated steam into the reaction vessel to be thermally cracked to oil fractions and pitch, wherein the superheated steam is blown into the reaction vessel from the bottom portion thereof so that the superheated steam generates rotational flow around the central axis of the shell of the reaction vessel.

Process, reactor and facility for thermally cracking heavy petroleum oil

A process for the production of bisphenol A, including providing a melt of a crystalline adduct of bisphenol A and phenol, contacting the melt with a cation donating solid to neutralize the strong acid therewith, and then heating the melt to vaporize and remove phenol from the melt.

Process for the production of bisphenol A

The invention relates to a process for preparing prilled bisphenol A by granulation which comprises adding compounds soluble in molten bisphenol A, not affecting adversely the melt color of bisphenol A to any significant extent, and have a melting point of 60.degree. C. or more to bisphenol A and granulating and also to a process which comprises adding the reaction mother liquor or cyrstallization mother liquor produced in the manufacturing step of bisphenol A to bisphenol A or the adduct of bispheol A and phenol or a mixture of bispheol A and phenol, removing the phenol, and granulating. The processes yield prilled bispheol A which have high strength and resist powdering.

Process for preparing prilled bisphenol A

Growing community of inventors

Yokohama, Japan

Makoto Nomura