Abstract: Process for removing sulfur compounds contained in a residual gas with recovery of said compounds in the form of sulfur, wherein a gas obtained from a residual gas containing H.sub.s S and SO.sub.2 and having a temperature lower than 160.degree. C. is subjected to a catalytic CLAUS reaction phase with deposition of sulfur on the catalyst and periodic regeneration of the sulfur-laden catalyst and cooling of the regenerated catalyst. The gas brought in contact with the CLAUS catalyst is produced by subjecting the residual gas to a hydrogenation and hydrolysis treatment to provide the sulfur compounds in the unique form of H.sub.2 S and to cooling with water separation by condensation and then to catalytic oxidation of H.sub.2 S in CLAUS stoichiometry with cooling of the gas stream obtained from the oxidation step under 160.degree. C. in order to separate the sulfur by condensation. Application to the purification of the residual gases emitted by CLAUS sulfur plants.

Abstract: Device for blocking off a well in open flow which includes a blocking system (4) for blocking off the well, an anchorage system (3) to support said blocking system (4) and a movable and inclinable support and positioning system (5) which comprises a sliding ramp (6) and mechanism for moving the blocking system (4) to bring it above the end of the casing (2) to be blocked off. Application: exploration, production and storing of hydrocarbons.

Abstract: Method for treating drilling effluents containing ligno-sulfonates wherein, successively, sulfuric acid is injected in order to cause coagulation, a cationic polyelectrolyte is injected to cause a flocculation and solids are separated from the liquid by centrifugation or dewatering compaction.

Abstract: The invention relates to the preparation of alkylthiophenols by reaction of a dialkyl disulphide with a phenol.In the process according to the invention, the reaction is carried out in the presence of aluminum chloride or of ferric chloride in a solvent of the alkylbenzene type or, soley in the case of methylthiolation, in an excess of dimethyl disulphide.This process makes it possible, in particular to obtain, with a selectivity and in a yield which are excellent, 2-alkylthiophenols which may then be converted into 4-acyl-2-alkylthiophenols by means of a reaction at a temperature ranging from 40.degree. to 100.degree. C. with a complex BF.sub.3 :2RCOOH where R denotes an alkyl or propenyl radical, in a proportion of 10 to 15 moles of complex per mole of 2-alkylthiophenol.

Abstract: The invention relates to production of esters of mercaptocarboxylic acids and alcohols forming an azeotrope with water.The esterification is carried out continuously in the presence of an excess of alcohol and the water formed is removed by entraining azeotropically under vacuum at a temperature such that the residual water concentration in the reaction mixture remains constantly below 0.5% by weight.The process according to the invention applies more particularly to the synthesis of octyl esters of thioglycolic acid.

Abstract: The invention relates to the manufacture of vicinal alkanedithiols from the corresponding alkylene trithiocarbonates.The method according to the invention consists in treating alkylene trithiocarbonate with an alkaline sulfide, followed by acidification of the reaction medium.The method is particularly well-suited for the synthesis of ethanedithiol from ethylene trithiocarbonate.

Abstract: The invention relates to the preparation of organic disulphides and polysulphides by the action of sulphur on a mercaptan or on a polysulphide which is lower in sulphur, in the presence of a basic catalyst.In the process according to the invention, an anion exchange resin is used as catalyst.

Abstract: Device for measuring by gammagraphy fluid flows, in particular in drilling cores of porous media originating from oil fields, said device being used under field conditions. The device comprises a tubular body, the outer part of which is permeable to radiation, and which is held between tie rods, and a piston at one end, the sample being placed at the other end inside a flexible sleeve between the piston and a fixed support. The lateral wall of the tubular body is lined with a thin inner metal liner permeable to radiation.

Abstract: Pressure and temperature are sensed with first and second interferometers having beam paths originating at an optical fiber located at a collimating lens focal point. One interferometer includes a deformable membrane having a deformation responsive to the sensed pressure and temperature which cause the membrane position to vary with respect to a face of a glass plate. In the second interferometer the optical path length varies as a function of the sensed temperature. The collimating lens collects optical beams derived from the first and second interferometers and supplies them to the optical fibre. In one embodiment, the interferometers are coaxial and in parallel; in a second embodiment the interferometers are in series.

Abstract: The invention is a catalytic process for removing H.sub.2 S and hydrogen polysulfides from liquid sulfur. The process comprises mixing a heterocyclic compound with the liquid sulfur and removing the hydrogen sulfide from the liquid sulfur by contact with a gas which is inert to the liquid sulfur at the treating temperature.

Abstract: The rear face of the piston (7) and the corresponding inner face of the pump body (1,2,3,4) are complementarily shaped so as to make the volume of the rear chamber (31) of the cell as small as possible, and, when the cell is in the storing position, the unit of the two front (32) and rear (31) chambers is insulated from the outside by a high-efficiency seal (3a,6a) which is formed automatically when the piston (7) arrives in the storing position.Measurements of the thermodynamic characteristics of the fluid deposits.

Abstract: The present invention provides a system and method for producing an effluent contained in a geological formation forming a reservoir for said effluent or producing formation, including a central well, at least one subhorizontal drain as well as a displacing or displacement agent, the displacement agent being injected into the formation either from the central well or from the subhorizontal drain and the displacement agent causes migration of the effluent to be produced.

Abstract: The invention is an improved catalytic process for removing H.sub.2 S and sulfanes from liquid sulfur and a catalyst system for carrying out the process. The catalyst comprises a basic component and a surfactant component.

Abstract: The invention relates to the production of dialkyl disulphides of the R-SS-R type where R represents an alkyl radical having from 1 to 3 carbon atoms, by oxidation of the corresponding alkyl mercaptan R--SH by sulphur in the presence of a catalyst.A combination of an alkyl mercantap R'--SH with an alkylene oxide and an alkaline base is used as catalyst, R' representing an alkyl radical having from 6 to 18 carbon atoms.This catalyst enables a lower dialkyl disulphide of excellent quality to be obtained (absence of amine and coloration).

Abstract: This invention relates to the preparation of benzyl mercaptan by reacting benzyl chloride and ammonium sulfhydrate.In the process according to the invention, the reaction is carried out under autogenous pressure in a closed reactor in two steps. The first comprises adding the benzyl chloride to an aqueous solution of ammonium sulfhydrate at a temperature below 80.degree. C. The second comprises heating the reaction mixture to a temperature in the range 80.degree. to 100.degree. C.

Abstract: A system for chlorination of a fluid to be treated, which includes a container containing trichlorocyanuric acid in a solid and compact form, a first pipe for supplying the container with dissolving fluid, an evacuation pipe in which the chlorinated fluid circulates, connecting the container to a pipe which contains the fluid to be treated, a chlorine analyzer connected to the pipe and which includes a mechanism for continuously measuring the amount of active chlorine in the treated fluid and released constantly by direct contact of the fluid to be treated with a surface of the trichlorocyanuric acid; and a flow rate regulation mechanism connected to a supply and including a mechanism to for constantly varying a continuous flow rate of the dissolving fluid passing into the container as a function of the amount of active chlorine present in the treated fluid and measured by the chlorine analyzer.

Abstract: This invention relates to improvement to a process for the preparation of mercaptoalcohols containing, more particularly, up to 24 carbon atoms and, preferably, more than 3 carbon atoms, by reaction of the corresponding vicinal epoxides with hydrogen sulphide.The process comprises incorporating into the reaction mixture a catalyst comprising a guanidine and/or of organic derivatives of a guanidine, and/or of guanidine salts, in particular of guanidine salts. The catalyst can be either in liquid and/or solid form, depending on the nature of the catalyst and its solubility in the reaction mixture, or fixed and/or impregnated into various solid materials. The materials can be organic in nature such as neutral and/or basic polymer resins, polymers or copolymers, or can be inorganic in nature such as alumninas, silicas, aluminosilicates, zeolites, active charcoals, oxides and/or metal salts.

Abstract: The installation combines with at least one production well-head an oil/gas separator of substantial vertical elongation and of which the major part may be housed in a pit sunk and lined closed to the working well, which permits of wide fluctuations in the oil/gas level between the high and low control points while ensuring sufficient submersion of the pump with which the separator is equipped. This apparatus makes it possible separately to draw off the gas on the one hand and the sufficiently degasified oil on the other, from a peripheral site to a central production station.

Abstract: Process for removing sulfur compounds contained in a residual gas with recovery of said compounds in the form of sulfur, wherein a gas obtained from a residual gas containing H.sub.2 S and SO.sub.2 and having a temperature lower than 160.degree. C. is subjected to a catalytic CLAUS reaction phase with deposition of sulfur on the catalyst and periodic regeneration of the sulfur-laden catalyst and cooling of the regenerated catalyst. The gas brought in contact with the CLAUS catalyst is produced by subjecting the residual gas to a hydrogenation and hydrolysis treatment to provide the sulfur compounds in the unique form of H.sub.2 S and to cooling with water separation by condensation and then to catalytic oxidation of H.sub.2 S in CLAUS stoichiometry with cooling of the gas stream obtained from the oxidation step under 160.degree. C. in order to separate the sulfur by condensation. Application to the purification of the residual gases emitted by CLAUS sulfur plants.

Abstract: The invention relates to the synthesis of dithiols and more particularly that of .alpha.,.omega.-dithiols having 5 to 20 carbon atoms.The process according to the invention comprises reacting a di-(tertiary-alkylthio)alkane with hydrogen sulphide in the presence of a solid acid catalyst. The alkane dithiol is obtained selectively and a tertiary-alkyl mercaptan is obtained as by-product. It is possible to reuse the latter in a cyclical process to produce the original di-(tertiary-alkylthio)alkane.