Abstract: A nitrogen-containing composition, useful as a detergent for gasoline, is obtained by reacting at least one unsaturated anhydride with at least one olefin to convert 20-80% of the anhydride and thereafter reacting the resultant product with a polyamine of the general formulaH.sub.2 N--[(--CH.sub.2 --)--.sub.n NH].sub.m R.sup.7wherein R.sup.7 is a monovalent aliphatic radical of 6-30 carbon atoms, n is an integer from 2 to 5 and m is an integer from 1 to 10.

Abstract: Ethers of polyols are prepared by reaction of a polyol and an organic chloride in a two phase medium in the presence of a phase transfer catalyst. The ethers of polyols are useful as synthetic lubricants, as lubricant bases, as lubricant additives and as fuel additives.

Abstract: Novel filter aid compositions enabling the improvement of limiting filterability temperature and the simultaneous inhibition of settling of the n-paraffin crystals formed at low temperature, comprising a mixture:of a compound A chosen from among the group of polymers or copolymers having a molecular weight between 500 and 15000 and having a branching rate between 10 and 30 points per 100 carbon atoms;and a compound B resulting from the condensation of at least one cyclic anhydride and at least one linear N-alkyl-polyamine;the weight ratio between these constituents A and B being from 1:20 to 20:1.

Abstract: The invention relates to a process to improve the stability of a catalyst to be used for lowering the cloud or turbidity point and the filterability limit temperature of gas-oils.The catalyst is formed of a composite system constituting 5 to 90% of a hydrodesulfuration type catalyst A and 95 to 10% of a hydroconversion type catalyst B, these two catalysts being either mixed or superposed, in which case catalyst A forms the top of the catalytic bed.

Abstract: A method of preparation of polymer-asphalt (bitumen) compositions which comprises mixing, with agitation, at a temperature of 130.degree. to 230.degree. C., 80 to 98% by weight of an asphalt having a penetration between 30 to 220, and 2 to 20% by weight of a polyblock copolymer of a styrene-carboxylated conjugated diene having a mean molecular weight of 30,000 to 300,000, and maintaining this mixture for at least 2 hours at this temperature, then adding 0.1 to 3% of elemental sulfur, based on the asphalt, while maintaining the same conditions of agitation and temperature for at least 20 minutes, the carboxylated conjugated diene sequence being selected from the group consisting of carboxylated polybutadiene and carboxylated polyisoprene.

Abstract: A process for continuously separating the constituents of a mixture characterized in that it consists in introducing the gaseous mixture in an enclosure containing a selective adsorption agent or adsorbent, and subjecting the said mixture to a cyclical series of hot and cold steps induced by sudden variations of temperature between a temperature T.sub.c called the "hot temperature" and a temperature T.sub.F called the "cold temperature" in order to create in the cold steps three distinct zones moving in the flow-direction at different speeds:a zone of low-speed propagation comprising a sorption front in which the concentration of gas having the most adsorbable constituents decreases;a zone called the "thermal wave" induced at times determined by the sudden cooling of the load mixture;a desorption zone where the mixture is enriched in the most adsorbable constituents.

Abstract: This invention concerns the storage and conveyance of thermal energy at low temperature, by using the latent heat produced by a substance during changes of state.This substance consists of a salt producing considerable latent heat during change of state, such as Na.sub.2 SO.sub.4, 10 H.sub.2 O, combined closely with a nucleating agent such as borax and dispersed in an oil to which an emulsifying agent has been added.This product is particularly suitable for storage of solar energy at low temperature and for heating of enclosed areas.

Abstract: A method for automatic electrochemical titration, by argentimetric coulometry, comprising automatic injection into an electrochemical cell of a sample containing a substance A to be titrated, and an electrolyte, the ratio of sample to electrolyte being constant, and coulometrically titrating the mixture by producing a substance B, at an electrode and following the reaction between A and B, by potentiometry. The method is particuarly useful for the automatic, industrial analysis of mercaptans.

Abstract: A process for the catalytic conversion of aromatic fractions additionally containing variable proportions of C.sub.5 to C.sub.11 non-aromatic hydrocarbons, to obtain substantially pure benzene and hydrogen, by water dealkylation of the aromatic hydrocarbons and simultaneous reforming of the non-aromatic hydrocarbons, characterized in that aromatic fractions having boiling points which may be varied depending on the yield of hydrogen desired, are treated by steam at temperatures from 350.degree. C. to 600.degree. C., at a pressure of 1 to 80 bars, a volume of liquid passed per unit volume of catalyst of 0.1 to 10 and a water/hydrocarbon charge flow rate ratio of 0.2 to 4, in the presence of a dealkylation catalyst selected from at least one group VIII metal, on a support selected from a sieve L, a pretreated gamma alumina, and a mixed spinel (M.sub.x M'.sub.1-x) Al.sub.2 O.sub.4, M being a non-noble group VIII metal, and M' being selected from the group consisting of magnesium, manganese, and copper.