Eniricerche S.p.a.

Snamprogetti S.p.a.

Anic S.p.a.

Eniricerche S.p.a.-and- Snamprogetti S.p.a.

Aldo Prevedello

Edoardo Platone

Maurizio Brunelli

Elio Donati

Armando Marcotullio

Riccardo Rausa

Giuseppe Bellussi

Arnaldo Roggero

Mario G Clerici

Giulio Alberti

Morello Morelli

Fabrizio Bonaccorsi

Dario Ercolani

Carlo Carniani

Marinella Malentacchi

Carlo Corno

Goffredo Romano

Disclosed is a low-viscosity cement composition, useful in the field of oil drilling, comprising cement, water and an additive obtained by salifying into the alkali-metal, alkali-earth metal, or ammonium salt, the sulphonated and oxidated products derived from the reaction between sulphur trioxide and cookery tar or sulphur trioxide and fuel oil from steam cracking; the cement composition is endowed with improved rheological characteristics such as a low-viscosity value without substantial changes in the pumping times, even at high temperatures and pressures.

Low-viscosity cement composition

A process for preparing a sulfonated dispersant from a petroleum asphalt fraction, comprising:

Process for preparing a sulfonated dispersant from petroleum asphalt

A concrete composition contains hydraulic cement, inerts, water and superfluidifying additive obtained by salifying, in the form of an alkaline metal, alkaline earth metal or ammonium salt, the sulphonated and oxidised products resulting from the reaction between sulphur trioxide and fuel oil deriving from steam cracking. This concrete composition has improved workability characteristics and enables concretes to be obtained generally possessing greater strength and durability.

Concrete composition containing a superfluidifying additive

A fluidizing and dispersing additive for coal-water mixtures, constituted by an ethoxylated adduct of either natural humic acids, or of humic acids deriving from partial coal oxidation.

Fluidizing and dispersing additives for coal-water dispersions

Storage-stable, pumpable, concentrated dispersions of coal in water contain a non-ionic additive constituted by a polymer containing polyethoxy chains grafted onto suitably functionalized polystyrenes having a molecular weight comprised within the range of from 500 to 15000.

Stabilizer and fluidifier additives for dispersions of coal in water

Disclosed is a solid catalyst functionalized with sulfonic groups, containing from 20 to 99% by weight of silica, with the residual percentage being definable by means of the formula:

Solid catalyst functionalized with sulfonic groups, process for

Storage-stable, pumpable concentrated dispersions of coal in water contain a non ionic additive constituted by the product of polyethoxylation of a styrene-allyl alcohol copolymer having a relatively low molecular weight.

Fluidifier additives for dispersions of coal in water

2,5-Dimethyl-2,4-hexadiene is prepared by dehydrating 2,5-dimethyl-2,5-hexanediol in liquid phase. The reaction takes place by contacting 2,5-dimethyl-2,5-hexanediol, melted or dissolved in an appropriate solvent, with acids, heating the mixture at a temperature of 100.degree. C.-160.degree. C. and distilling off water from the reaction environment as it is being formed. The pressure can range between 1 and 10 bars.

Process for preparing 2,5-dimethyl-2,4-hexadiene

New dinitriles are prepared by reacting an alpha, beta saturated nitrile with an alpha, beta unsaturated nitrile. For this preparation subzero temperatures are preferred. Higher diamines can be prepared by hydrogenating the dinitriles thus obtained, such diamines being reacted with a dicarboxylic acid or a salt, ester or chloride of such an acid to prepare polyamides having an amorphous character, i.e. transparent polyamides.

Method for synthesizing dinitriles, products obtained thereby and their

This invention relates to a new compound, 3,7 -dimethyl-3-hydroxy-6-octenenitrile, useful for the preparation of compounds of the class of the octenenitriles. The method for the preparation thereof is furthermore disclosed, according to which 2-methyl-hept-2-ene-6-one is reacted with acetonitrile.

3,7-Dimethyl-3-hydroxy-6-octenenitrile and process for its preparation

In the cyclization of gamma-delta or delta-epsilon unsaturated alcohols in order to obtain certain tetrahydrofuran and tetrahydropyran derivatives which are useful in the perfuming of detergents, the improvement consisting in that the alcohol to be cyclized is reacted with a cationic ion-exchange resin. The useful temperature range is from 20.degree. C. to 150.degree. C.: in practice the alcohol and the resin are boiled together or refluxed until the reaction is completed. A number of examples is reported and physicochemical data are given.

Method for the cyclization of gamma-delta, or delta-epsilon unsaturated

In the cyclization of gamma-delta or delta-epsilon unsaturated alcohols in order to obtain certain tetrahydrofuran and tetrahydropyran derivatives which are useful in the perfuming of detergents, the improvement consisting in that the alcohol to be cyclized is reacted with a cationic ion-exchange resin. The useful temperature range is from 20.degree. C. to 150.degree. C: in practice the alcohol and the resin are boiled together or refluxed until the reaction is completed. A number of examples is reported and physicochemical data are given.

2-Methyl-2-cyanomethyl-5-isopropyl tetrahydrofuran

In the cyclization of gamma-delta or delta-epsilon unsaturated alcohols in order to obtain certain tetrahydrofuran and tetrahydropyran derivatives which are useful in the perfuming of detergents, the improvement consisting in that the alcohol to be cyclized is reacted with a cationic ion-exchange resin. The useful temperature range is from 20.degree. C. to 150.degree. C.: in practice the alcohol and the resinare boiled together or refluxed until the reaction is completed. A number of examples is reported and physicochemical data are given.

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San Donato Milanese, Italy

Aldo Prevedello