Idemitsu Kosan Company, Limited

Idemitsu Kosan., Ltd.

Tokyo Rikakikai Co., Ltd.

Takatoshi Kunihiro

Susumu Yamamoto

Takao Katayama

Yozo Iwao

Mitsuo Tanuma

Koji Tsuchiya

Shinichi Ariga

A thin layer liquid film type evaporator including a cylindrical heating column, a heater for heating the cylindrical heating column, a liquid film forming plate disposed in the cylindrical heating column, a baffle also disposed in the cylindrical heating column and a feed nozzle disposed at the upper center of the cylindrical heating column. The liquid film forming plate has an outer diameter such that a clearance may be formed between the outer edge thereof and the inner circumferential surface of the heating column and that the liquid may flow through the clearance. Thus, a thin layer liquid film type evaporator which has a simple mechanism and can exhibit excellent evaporation efficiency can be provided.

Thin layer liquid film type evaporator

A process for producing a high quality refrigerator oil from an oil fraction boiling at a temperature within boiling point of lubricating oil by contacting said oil fraction with a solvent to extract undesirable components thereby lowering % C.sub.A of said oil fraction, hydrogenating said solvent extracted fraction under the specific conditions, and then contacting said hydrogenated oil with a solid absorbant to remove impurities; said oil fraction being obtained from a low grade naphthenic crude oil.

Process for the production of refrigerator oil

Base stocks for lubricating oil with excellent thermal stability are produced by hydrofinishing a mixture consisting of 10 to 60 percent by volume of a neutralized extract and 90 to 40 percent by volume of an unextracted intermediate distillate product of low total acid value, in which the neutralized extract is prepared by alkaline treating and vacuum distillation of a extract obtained by solvent extraction of said intermediate distillate product by a solvent having affinity for aromatic compounds.

Method of preparing base stocks for lubricating oil

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Chiba, Japan

Takatoshi Kunihiro