Abstract: Substituting aqueous hydrogen peroxide/hydrogen bromide for bromine in a known process for producing a ditertiaryalkyl substituted hydroxybenzaldehyde such as ditertiarybutyl hydroxybenzaldehyde from the corresponding ditertiaryalkyl substituted methylphenol results in a substantially impaired yield of product.Improved yields are obtained by employing a reaction temperature of at least 40.degree. C., preferably 50.degree. to 80.degree. C. in conjunction with a hydrophobic solvent such as chloroform. Preferably, the process employs very concentrated hydrogen peroxide solution, 65% to 75% w/w, introduced into the bromide-containing reaction mixture during a period of from 25 to 75 minutes.

Abstract: A dilute solution of a lower aliphatic peracid such as peracetic acid, having an equilibrium composition, is produced by contacting hydrogen peroxide with a lower aliphatic acid each at initial high concentrations in an aqueous reaction mixture to rapidly form a reaction mixture containing, for example, up to 30% by weight of peracid and diluting the reaction mixture with water and with any required quantities of lower aliphatic acid and/or hydrogen peroxide to reproduce the equilibrium composition of the dilute solution, the process being characterized in that the reaction mixture rich in lower aliphatic peracid is diluted before it has itself reached equilibrium, for example when it contains from 20 to 80% of its potential equilibrated content of peracid. The process provides a quick plant-efficient process for the production of stable dilute lower aliphatic peracid solutions for industrial disinfection purposes or for personal or domestic hygiene use.

Abstract: Sodium percarbonate particles stabilized by being coated with a solid coating material which contains a mixture of sodium carbonate and sodium chloride, optionally together with one or more auxiliary agents used in the manufacture of sodium percarbonate.

Abstract: The present invention provides a process for the preparation of vicinal diols and/or epoxides by the oxidation of olefinically-unsaturated compounds with the use of an inorganic heptavalent rhenium compound as catalyst and of hydrogen peroxide as oxidation agent, wherein the reaction is carried out in a solvent selected from the group consisting of organic phosphoric acid esters and ethers with a boiling point above 50.degree. C. under atmospheric conditions.

Abstract: Process for the manufacture of hydrogen peroxide by alkylanthraquinone oxidation (AO process) in which the hydrogenation stage of the alkylanthraquinones is carried out in the presence of a catalyst containing palladium supported on alumina granules which have been subjected to a halogenation treatment prior to fixing the palladium.

Abstract: The compound 6,6'-terephthal-di(amidoperoxyhexanoic) acid is disclosed.

Abstract: Reaction of amine-containing substrates with hydrogen peroxide can suffer from certain problems, especially in the presence of transition metals. These problems include both in situ generation of impurities and particularly nitrosamines, which are allegedly carcinogenic, and also impaired product formation. The problems can be ameliorated by employing in the reaction mixture free radical scavengers, including in particular phenols and polyhydroxy-substituted aromatic compounds. The scavengers are advantageously employed in conjunction with a metal chelating agent such as polycarboxylic acid or an organopolyphosphonic acid.

Abstract: An improved process for the production of carboxylic acids and dicarboxylic acids by the catalytic oxidation of olefins and vicinal diols by hydrogen peroxide is provided. The process employs a rhenium (VII) catalyst, and a solvent comprising a mixture of a carboxylic acid or anhydride having 2 or more carbon atoms and a high boiling cyclic or acyclic ether. Particularly suitable carboxylic acids or anhydrides include acetic acid, propionic acid and acetic anhydride. Particularly suitable high-boiling ethers include 1,4-dioxane and diglyme.

Abstract: Conventional plant to produce peroxomonosulphuric acid (Caro's acid) is large and emphasises extensive cooling, so that it is awkward to transport, can be cumbersome to install beside existing plant and can suffer from relatively expensive capital and/or running costs.In the present invention, Caro's acid is generated continuously in relatively small plant adiabatically, by introducing concentrated hydrogen peroxide into a stream of concentrated sulphuric acid in a reaction chamber dimensioned so that the throughput is very fast. In particularly suitable embodiments, the reaction chamber is annular at the points of introduction of the reagents, its width being greater in the vicinity of the hydrogen peroxide inlet than in the vicinity of the sulphuric acid inlet. The hydrogen peroxide inlet is preferably angled backwardly so that its encounter angle with the sulphuric acid stream is over 90.degree. to about 165.degree..

Abstract: Process for obtaining aqueous hydrogen peroxide solutions by the alkylanthraquinone process, providing a concentrated aqueous hydrogen peroxide solution with a low content of impurities, according to which a continuous addition of acidifying compounds and/or of stabilising compounds is performed, consisting in recycling towards the oxidation unit at least a part of the purge leaving the distillation unit.

Abstract: Peracetic acid compositions containing at least one thickening agent and optionally a stabilizer chosen from sequestering agents, free-radical scavengers and mixtures containing two or more of these products.The preferred compositions are obtained by successively incorporating at least one stabilizer and then at least one thickening agent.These compositions are especially capable of being employed for the disinfection of large bulks which are difficult to immerse and of nonhorizontal surfaces, and for detergency or bleaching at low temperature.

Abstract: Process for obtaining purified hydrogen peroxide solutions, consisting in evaporating the crude aqueous hydrogen peroxide solution containing the impurities and feeding by means of the vapour phase produced the foot of a distillation column provided in its lower part with a zone for washing the vapour phase with a small flow of liquid which refluxes in the bottom of the column and which has the same composition as the purified aqueous hydrogen peroxide solution forming the product leaving the column, in drawing off this purified product at a column height such that the draw-off is carried out above the vapour phase washing zone and in collecting at the bottom of the column a residue consisting of the small flow of washing liquid which contains most of the impurities. The washing zone has a diameter which is greater than that of the remainder of the column.Distillation column for carrying out the process.

Abstract: Process for the synthesis of aromatic alkylated hydrocarbons with a saturated alkyl chain including at least four carbon atoms, according to which an aromatic hydrocarbon, replaced by an alkyl group with a short saturated chain comprising one to three carbon atoms, is made to react with an olefin in the presence of a catalyst made up of at least one alkaline metal or a alkaline metal hydride impregnated on an alumina support. The process is characterised by the fact that the catalyst is prepared in the reaction medium in the presence of the aromatic hydrocarbon with a short alkyl chain by mixing anhydrous alumina with the alkaline metal hydride or with the alkaline metal, and then the olefin is introduced in order to start the reaction.

Abstract: Process for color stripping and bleaching of colored waste paper by treatment by means of monoperoxysulphuric acid or of one of its salts, according to which the treatment is performed in the presence of a halide ion.

Abstract: The invention provides a new sub-class or organic peroxyacids comprising N-alkyl substituted peroxytrimellitimide of formula (I) in which R=hydrogen or linear or branched alkyl, which demonstrates an excellent combination of safe-handling and bleach performance rendering the sub-class particularly suitable for use as bleach and/or disinfectant in various bleach, bleach additive or washing compositions. Effective bleaching peroxyacids include those in which R=n propyl, iso-propyl, n butyl, sec-butyl, n pentyl and n heptyl. The invention also comprises processes for making the peroxyacids, compositions containing them and processes for washing and/or bleaching and/or disinfecting employing the invention peroxyacids or compositions containing them.

Abstract: The electronics industry demands that hydrogen peroxide for use therein be purified to very low levels of impurities, currently at the level of a few ppb for some impurities, or even lower. However, existing methods are either inherently unsafe because they bring concentrated hydrogen peroxide into contact with a concentrate of transition metal decomposition agents for peroxide and a purification resin which acts as a source of carbon, or are unable to attain the desired impurity level. The instant purification process first makes a concentrated suspension of stannic oxide particles in an aqueous medium, which can include aqueous hydrogen peroxide, by subjecting the mixture to high shear mixing, introducing an effective amount of the dispersion into the peroxide solution and filtering the mixture so as to remove the stannic oxide particles that now are loaded with ionic impurities, and particularly with transition metal ions.

Abstract: In one class of processes for making poorly soluble organic peroxyacids the corresponding carboxylic acid is reacted with hydrogen peroxide in a reaction medium containing a high concentration of sulphuric acid. The presence of such constituents in the reaction mixture and the manner of the reactants and the way in which they are brought into contact, can result in the processes being hazardous. In the present invention, hazard problems are reduced or eliminated by first dissolving the carboxylic acid in concentrated sulphuric acid, secondly forming a Caro's acid solution containing a complementary amount of sulphuric acid and hydrogen peroxide within a predetermined range, and then introducing the carboxylic acid solution at a controlled rate in the Caro's acid solution, often over a period of from about 30 to 90 minutes, with agitation and temperature control.

Abstract: The electronics industry demands that hydrogen peroxide for use therein be purified to very low levels of impurities, currently at the level of a few ppb for some impurities, or even lower. However, existing methods are either inherently unsafe because they bring concentrated hydrogen peroxide into contact with a concentrate of transition metal decomposition agents for peroxide and a purification resin which acts as a source of carbon, or are unable to attain the desired impurity level. In the instant purification process, the hydrogen peroxide solution is passed through a membrane having a very small pore size which contains an ion exchange resin that is capable of removing alkali and alkaline earth metal ions from solution. The feed solution in characterized in that it contains no more than a small proportion by weight of transition metals that catalyse hydrogen peroxide decomposition compared with the total metals content.

Abstract: Diacetoxyatene compounds are obtained by reacting a perborate such as sodium perborate monohydrate or tetrahydrate and acetic acid with an iodoarene compound under mild conditions, such as 40 to 50.degree. C. The iodoarene can be further substituted by a wide range of substituents, such as halo, nitro, alkyl, alkoxy or carbosylic acid, in any position around the nucleus, except that electron withdrawing substituents occupy meta positions only. The invention process thus enables a wide range of substituted diacetoxyarene compounds to be produced using widely available and easily handled materials under mild operating conditions.

Abstract: Method of storing sodium perborate monohydrate granules at elevated surrounding temperature of between 10.degree. and 65.degree. C., according to which the granules are stored in bulk in a closed enclosure proofed against the surrounding atmosphere, into which is introduced a slow flow of dry air which is forced to pass through the mass of the granules, the air flow escaping to the atmosphere through a small opening made in the part of the enclosure away from that where the said flow is introduced.The process applies to the transport of sodium perborate monohydrate in a tank truck.