Nippon Oil Company

Matsushita Electric Industrial Co., Ltd.

Masaaki Tsunemi

Umekichi Sasaki

Yoshiyuki Morikawa

Hiroo Takeda

Takeshi Kanda

Michihiro Mohri

Kaichi Yamada

Tadashi Uchiumi

A refrigeration oil composition conforming to this invention essentially comprises a bicyclic compound of the formula ##STR1## where R.sub.1 and R.sub.2 may be the same or different and each are an alkyl group of 1.about.5 carbon atoms; R.sub.3 is hydrogen or an alkyl group of 1.about.5 carbon atoms; and m and n may be the same or different and each are 0 or an integer of 1.about.5, said bicyclic compound having a dynamic viscosity of 5.about.20 cSt at 40.degree. C. The composition may further incorporate various additives useful for inhibiting wear, oxidation, foaming and the like.

Refrigeration oil composition

Oil compositions are disclosed for effective use in the lubrication of rotary-type compressor for refrigeration equipment. The composition essentially comprises a polyglycol oil blended with specified amounts of at least one of additives or compounds of the group consisting of glycidyl ether type epoxy compounds, epoxidized fatty acid monoesters and epoxidized vegetable oils.

Refrigeration lubricating oil compositions

A method for treating waste waters to remove oils and/or COD therefrom, which comprises accomodating solid porous packing pieces and activated carbon particles in a container, the porous packing pieces forming a stationary porous packed bed, the average pore diameter of the porous packing pieces being 1.5 to 8 times the average diameter of the activated carbon particles; introducing a waste water, if desired, together with an oxygen-containing gas and/or an oxidizing gas, from the bottom portion of the container to fluidize the activated carbon particles within the pores of the porous packing pieces and in spaces among the adjoining porous packing pieces and simultaneously to contact the waste water with the activated carbon particles; maintaining the upper level of the fluidized bed of the activated carbon particles at least 5 cm below the upper level of the porous packed bed; and withdrawing the waste water which has been so contacted from the top portion of the container.

Method for treating waste waters

Growing community of inventors

Kawasaki, Japan

Masaaki Tsunemi