摘要:
The invention relates to a process for the extraction of paraffins from mixtures obtained by the sulfoxidation of paraffins having a number of carbon atoms within the range of 12 to 18, which is characterized in that carbon dioxide is used as the solvent under supercritical conditions.
摘要:
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.
摘要:
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 μm 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.
摘要:
Mixed zirconium and yttrium oxides (ZrO.sub.2 (Y.sub.2 O.sub.3)) with a yttrium content (evaluated as metal) from about 15 to about 21% by weight, as powders in cubic crystal form, are prepared by:mixing an aqueous solution of zirconium and yttrium carboxylates with an organic solvent in the form of a nitrile or alcohol;from said mixture, precipitating solid particles of the precursors of mixed zirconium and yttrium oxides by operating at a pH between 5 and 7 and at ambient or close to ambient temperature; andcalcining said precipitated solid particles at high temperature to directly transform them from the amorphous state to the cubic crystal form.The mixed zirconium and yttrium oxides obtained in this manner are suitable for use in the ceramics sector.
摘要:
Oil drill cuttings, containing an oil-based mud, may be treated by mixing the cuttings with an organic solvent. The oil drill cuttings are then separated from the organic solvent and extracted oil. The organic solvent is then separated from the oil, and mixed with the extracted oil drill cuttings to extract additional oil therefrom. The oil drill cuttings are again separated from the organic solvent and oil, the oil separated from the solvent, and recombined with the oil from the first extraction step. The oil base and other mud components are recycled, depending on the treatment procedure, for subsequent use in drilling.
摘要:
Process for recovering and moving highly viscous petroleum derivatives by the formation of aqueous dispersions in the presence of water with a salinity of more than 0.6% by weight, particularly from 1 to 15% by weight, with the use of hydrosoluble sulfonated dispersants, said process being characterized in that the above sulfonated dispersants have a content of the high molecular weight fraction, determined by SEC analysis (Size Exclusion Chromatography), of more than 4%.
摘要:
A cementitious composition for oil well cementation able to prevent fluid migration comprises water, hydraulic cement, surfactant or organic dispersant, and carbon black.
摘要:
A process is disclosed for beneficiation of coal by selective caking, in which process a caking mixture is employed consisting of:one or more solvents selected among light hydrocarbons having boiling points not higher than 70.degree. C.;one or more non-ionic additives selected among oil soluble propoxylated or propoxylated-ethoxylated phenolic or alkylphenolic compounds;possible one or more heavy co-caking agents selected among coal-derived oils having boiling points between 200.degree. C. and 400.degree. C., or the residual products of petroleum refining, or mixtures thereof.
摘要:
A process is disclosed for the beneficiation of coal by selective caking, in which process a caking mixture is employed consisting of:one or more solvents selected from among light hydrocarbons having boiling points not higher than 70.degree. C.;a non-ionic, oil-soluble additive obtained from controlled propoxylation of the phenolic fractions derived from cake-oven tars;and possibly one or more heavy co-caking agents selected from among coal-derived oils having boiling points between 200.degree. and 400.degree. C., or the residual products of petroleum refining or mixtures of the same.
摘要:
Process for recovering and moving highly viscous petroleum products, by the use of aqueous dispersions in the presence of sulphonate dispersers prepared:a) by increasing the molecular weight of steam cracking fuel oil by its oligomerization in the presence of a catalyst selected from BF.sub.3 and complexes thereof with strong acids;b) sulphonating the compound obtained from step (a) by reaction with a sulphonating agent, preferably SO.sub.3 ;c) neutralizing the sulphonate obtained from step (b) by treatment with hydroxides selected from the hydroxides of alkaline or earth alkaline metals or ammonium.