摘要:
Polyalkenyl succinimides which can be obtained with a process which comprises: a. reacting a reactive medium-high molecular weight polyalkene with maleic anhydride at a temperature higher than 180° C.; b. carrying out the reaction thermally for a time sufficient for having a conversion of the terminal vinylidene groups higher than 10%; c. completing the thermal reaction in the presence of a reaction accelerator consisting of a Lewis acid; d. reacting the reaction product of step (c) with an amine which has at least one primary aminic group capable of forming an imide group.
摘要:
Polyalkenyl succinimides which can be obtained with a process which comprises: a. reacting a reactive medium-high molecular weight polyalkene with maleic anhydride at a temperature higher than 180° C.; b. carrying out the reaction thermally for a time sufficient for having a conversion of the terminal vinylidene groups higher than 10%; c. completing the thermal reaction in the presence of a reaction accelerator consisting of a Lewis acid; d. reacting the reaction product of step (c) with an amine which has at least one primary aminic group capable of forming an imide group.
摘要:
Fuel for motor vehicles comprising an emulsion between water and a liquid hydrocarbon, and an anti-cavitation additive comprising a copolymer including 20-80% in moles, preferably 35-70% in moles, of units containing at least one carboxylic group and 80-20% in moles, preferably 65-30% in moles, of units deriving from at least one monomer having an ethylene unsaturation, and wherein at least 20% in moles of the carboxylic groups, preferably 30-90% in moles, is in the form of at least one derivative selected from carboxylate salt, ester, amide and imide.
摘要:
A process for preparing activated charcoal having a high surface area is described, including a thermal treatment, in the presence of phosphoric acid, of regenerated humic acids.
摘要:
Process for the preparation of polyalkenyl acylating agents which comprises: a. reacting at a temperature higher than 180° C. a reactive polyalkene, having a number average molecular weight Mn ranging from 500 to 5000 and having a content of terminal vinylidene groups greater than or equal to 30%, with an enophile; b. thermally carrying out the reaction for a time sufficient for having a conversion of the terminal vinylidene groups higher than 15%; c. completing the reaction always under heat in the presence of a reaction accelerator consisting of a Lewis acid selected from a tin, zinc, aluminum or titanium halide.
摘要:
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.
摘要:
A process is disclosed for the production of humic acids, which comprises an oxidation of coal in dry phase with oxygen or mixtures of oxygen and nitrogen in a fluidized-bed reactor, by using coal with a granulometry comprised within the range of from 100 .mu.m to 3 mm and operating at a temperature comprised within the range of from 150.degree. to 300.degree. C., under a partial pressure of oxygen comprised within the range of from 1.1 abs.atm. to 10 abs.atm., for a contact time comprised within the range of from 30 minutes to 600 minutes.
摘要:
A process is disclosed for the removal of metals from waters containing them, comprising the treatment of the waters with an aqueous solution of alkaline salts of humic acids, which is characterized in that said solution is obtained by the dry oxidation of coal by oxygen or mixtures of oxygen and nitrogen, in particular air, and the subsequent extraction of the raw oxidation product by an alkaline solution, and that said aqueous solution is added to into the waters as such, wherein the humic acids salts perform a flocculating action, with the end pH being preliminarily to a value comprised within the range of from 1.5 to 5.5.
摘要:
A description follows of an aqueous dispersion of heavy oil residues, suitable for undergoing combustion with a low emission of SOx, comprising: (a) a heavy oil residue; (b) a dispersing agent; (c) a desulfurizing agent selected from CaCO3, MgCO3, dolomite and relative mixtures; (d) a desulfurizing agent with stabilizing and anti-corrosive properties selected from MgO, Mg(OH)2, CaO, Ca(OH)2 and relative mixtures; (e) water; the weight percentage of (e) with respect of the sum of (a)+(e) being at least 15%.
摘要:
Process for the preparation of polyalkenyl acylating agents which comprises: a. reacting at a temperature higher than 180° C. a reactive polyalkene, having a number average molecular weight Mn ranging from 500 to 5000 and having a content of terminal vinylidene groups greater than or equal to 30%, with an enophile; b. thermally carrying out the reaction for a time sufficient for having a conversion of the terminal vinylidene groups higher than 15%; c. completing the reaction always under heat in the presence of a reaction accelerator consisting of a Lewis acid selected from a tin, zinc, aluminum or titanium halide.