Other

Nippon Steel Corporation

Hidefumi Hirai

Susumu Hara

Makoto Komiyama

Keiichiro Wada

Hidehiko Takahashi

Rieko Matsui

Strong 5.alpha.a-reductase inhibitors are extracted and fractionated from Thuja orientalis and other similar crude drugs or they may be purified as diterpenes in isolated form. The inhibitors are used either on their own or as active ingredients of therapeutics in the treatment of diseases caused by the overactivity of 5.alpha.a-reductase or the hypersecretion of androgens, such as male pattern baldness, androgenetic alopecia, hirsutism, acne, prostatomegaly and cancer of the prostate.

Purified flavonoid and diterpene 5.alpha.-reductase inhibitors from

A solid adsorbent for an unsaturated hydrocarbon comprising (a) (i) a silver or copper(I) halide or (ii) a silver or copper(I) halide and the halide of a bivalent metal, or (iii) a silver or copper(I) halide and an aluminum halide, and (b) polystyrene or a derivative thereof. This solid adsorbent can effectively adsorb an unsaturated hydrocarbon such as ethylene from a gas mixture by contacting the gas mixture therewith at a temperature of -40.degree. C. to 140.degree. C. under normal pressures.

Process for separation of unsaturated hydrocarbon from gas mixture

Solid adsorbent for carbon monoxide and process for separation from gas

Solid adsorbent for unsaturated hydrocarbon and process for separation

With application of new liquid absorbent, comprised of a compound selected from a group composed of silver halide and cuprous halide, an aluminium halide, a polymer selected from a group composed of styrene and styrene derivatives, and an aromatic hydrocarbon, it is possible to recover ethylene by absorbing ethylene from gaseous mixture containing ethylene such as FCC off gas, ethylene plant off gas and coke oven gas. In particular, said liquid absorbent is neither diluted nor reduced its capability to absorb ethylene by water or its vapor contained in the said gaseous mixture, so the liquid absorbent can be used repeatedly for the recovery of ethylene from gaseous mixture containing ethylene and water or its vapor, without any pretreatment to reduce the water content of said gaseous mixture.

Process for recovery of ethylene from gaseous mixture

A process for separating carbon monoxide from a gas mixture is presented. In this process carbon monoxide contained in the gas mixture containing carbon monoxide and up to approximately 40,000 ppm of water can be effectively separated by contacting the gas mixture with an absorbing solution containing (a) at least one copper(I) halide, (b) at least one aluminum(III) halide and (c) at least one compound having at least two benzene nuclei in one molecule thereof. The component (c) is selected from the group consisting of (A) the compounds having the general formula (I): ##STR1## wherein R.sub.1 is hydrogen or an alkyl group, R.sub.2 and R.sub.3 are independently hydrogen, an alkyl group, or an aryl group, i is 0, 1, 2, 3, or 4, and m and n are independently 0, 1, 2, or 3, (B) the oligomers styrene or the derivatives thereof, (C) the polymers of styrene or the derivatives thereof and (D) copolymers of (i) styrene or the derivatives thereof and (ii) ethylene or the derivatives thereof and, optionally, an aromatic solvent, without causing the decrease in the carbon monoxide absorbing and releasing capacities of the absorbing solution.

Growing community of inventors

Tokyo, Japan

Susumu Hara