Snia Viscosa Societa' Nationale Industria Applicazioni Viscosa S.p.a.

Snia Viscosa Societa Nazional Industria Applicazioni Viscosa Spa

Franco Magnoni

Francesco Siclari

Pier P Rossi

Roberto Jacuone

A process for separating and recovering organic compounds from an oxygen-taining recycle gas deriving from an ozonization process is disclosed. The process comprises the separation of products in form of fumes from the gas, the countercurrent scrubbing of the gas with a polyoxyalkyleneglycol containing 2-4 carbon atoms, pre-treated with a monocarboxylic acid anhydride and/or the countercurrent scrubbing of the gas with the polyoxyalkyleneglycol or with an excess of a base. The organic compounds are recovered either by stripping (at atmospheric pressure or under vacuum) or by hydrolysis followed by distillation (at atmospheric pressure or under vacuum).

Process for purifying oxygen containing recycle gas deriving from

A method and a device are disclosed for lubricating the internal bearings thin-layer evaporators used in polycondensation or polymerization installations, in which the lubricant used for said internal bearings is the same polymer in an appropriate intermediate degree of polymerization where it exhibits the fluidity required to serve as a lubricant. Means are provided for circulating and recycling the polymer and critical viscosity values are suggested for the polymer when used as a lubricant.

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Milan, Italy

Franco Magnoni