Eniricerche S.p.a.

Enitecnologie S.p.a.

Raffaella Monga

Arnaldo Roggero

Angelo Calderoni

Alberto Gandini

Raffaello Sisto

Giuseppe Belmonte

Claudio Valentini

Otello Farias

Armando Marcotullio

Giovanni Ferrari

Process for recovering at least 70% of hollow glass microspheres having an average diameter, according to the ASTM D1214-1989, ranging from 5 to 200 &#x3bc;m contained in a mixture of drilling mud and cuttings which comprises: a) screening, if necessary, the mixture through one or more 5 to 20 mesh sieves; b) feeding the screened mixture to one or more cyclones and/or hydrocyclones arranged in series, each of which is fed with a volume flow-rate from 1.5 to 10 times higher than the maximum nominal operating value.

Process for the separation of hollow glass microspheres from muds containing them

A modified poly(2,6-dimethyl-p-oxyphenylene) with a glass transition temperature in the range of 180.degree.-220.degree. C. is described in which on the average between 10 and 60% of the macromolecules carry:

Alkylene oxide modified poly(2,6-dimethyl-p-oxyphenylene)

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Milan, Italy

Raffaella Monga