A process for extracting from aqueous solution the alkali metal or ammonium salt of a phenol, naphthol, anthrol or phenanthrol or the corresponding thiol, which comprises contacting an aqueous alkaline or neutral solution of the alkali metal or ammonium salt, in which is dissolved an alkali metal or ammonium fluoride, chloride, bromide, hydroxide, nitrate, nitrite, sulphate, sulphite, sulphide, thiosulphate, phosphate, hydrogen phosphate, carbonate, bicarbonate, cyanate, cyanide, thiocyanate, bo...

In accordance with the present invention, a process for repairing metal workpieces, such as turbine engine components, is provided. The process comprises the steps of forming a braze paste containing a first nickel base alloy material containing boron and chromium and a second nickel base alloy material containing chromium and cobalt, applying the brazing paste to an area of the metal workpiece containing at least one crack, and subjecting the workpiece and the brazing paste to a brazing cycle b...

A method of forming a polished semiconductor structure comprises polishing a surface of a semiconductor structure by chemical mechanical polishing. Pressure applied to the surface is reduced during the polishing, or a rotation rate of a polishing surface relative to the surface is reduced during the polishing.

A process for the oxidative leaching of sulphide mineral species, the method characterised by the method steps of: leaching a slurry containing the mineral species in one or more reaction vessels; circulating a stream of leach liquor to a flash cooler; flashing the liquor in the flash cooler at a pressure less than atmospheric pressure so as to dissipate heat; and recirculating the liquor to the or each reaction vessel.

A process for obtaining vinyl compounds by dehalogenation of halofluorinated compounds with aromatic substituents, having formula: T-Ar--(O).sub.y--CFX'--CF.sub.2X'' (I) wherein: X'=F, Cl, Br, I; X''=Cl, Br, I; y=0,1; when y=0 X'.noteq.F; T=H, --(O).sub.y--CFX'--CF.sub.2X'', wherein y, X' and X'' are as above; Ar is a monocyclic, bicyclic or tricyclic bivalent aromatic radical from 6 to 14 carbon atoms, optionally containing heteroatoms, or Ar is formed of two aromatic rings linked by a bivalent...

This invention relates to a novel process which comprises feeding a mixture formed from diphenylethane and bromine to a stirrable reaction mass comprised of bromine and a bromination catalyst to yield a decabromodiphenylethane wet cake which can be most economically treated to provide a high quality decabromodiphenylethane product.

A process oil comprising a 95/5 to 5/95 by weight mixture of: an extract having a DMSO extractable content less than 3 wt % obtained by solvent-extracting an oil obtained by deasphalting a vacuum distillation bottom; and either a mineral oil base having a DMSO extractable content less than 3 wt % which is a raffinate obtained by the solvent refining of a vacuum distillate or a mineral oil base having a DMSO extractable content less than 3 wt % obtained by subjecting a raffinate obtained by the s...

An improved oxidizer for liquid reduction-oxidation desulphurization processes uses a hollow fiber membrane contactor. A pressurized, oxygen containing gas stream is introduced into the interior of the hollow fiber membrane while a liquid reduction-oxidation catalyst solution contacts the exterior of the membrane. Oxygen diffuses through the membrane into the liquid reduction-oxidation catalyst solution whereby the solution is oxidized and can be recycled for further us in a desulphurization pro...

The present invention provides a developing process including the steps of charging toner particles supported on a developer carrier; and providing the charged toner particles to an electrostatic latent image formed on an image carrier, wherein, the charged toner particles satisfy formulas (1) and (2) shown below, when being measured by the laser doppler method in an oscillation field in an acoustic alleviation cell to determine individual particle size and charged amount thereof: k1=(B2-B1)/(A1...

The combustion process is carried out in presence of a primary catalyst coating which is treated when required by means of cerium/europium compound in presence of water vapor and advantageously in presence of a refractory material, such as a clay, a hydrated clay.