Snamprogetti S.p.a.

Eniricerche S.p.a.

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

Elio Donati

Aldo Prevedello

Edoardo Platone

Armando Marcotullio

Dario Ercolani

Arnaldo Roggero

Vincenzo Lagana

Fabrizio Bonaccorsi

Carlo Carniani

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

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

A method is described for preparing a high-concentration solids suspension, in particular coal or petroleum coke, which can be transported by pipe and be burnt with low emission of harmful substances, comprising crushing the solid to be suspended to a maximum particle size of 6 mm and then grinding it in the presence of additives in aqueous solution to a maximum solid particle size of 300 .mu.m, the method being characterized by adding, either before the crushing or immediately before the grinding, a desulphurizer chosen from CaCo.sub.3, MgCO.sub.3 and dolomite, either alone or in mixture, in a molar ratio to the sulphur contained in the solid of between 1.5 and 3, and adding immediately before or during grinding a desulphurizer also possessing stabilizing and anticorrosive properties and chosen from MgO, Mg(OH).sub.2, CaO and Ca(OH).sub.2, either alone or in mixture, in a quantity of between 0.04 and 0.4% by weight of the final suspension.

Method for preparing a high-concentration solids suspension in water

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.

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Fano, Italy

Elio Donati