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Matches 1,101 - 1,150 out of 7,063

Document Document Title
WO/2002/086037A1
The invention relates to a method for purifying a phenol derivative that is selected from among alkyl phenols with an average molecular weight of from 200 to 4000 and the Mannich adducts thereof. The inventive method is characterized by ...  
WO/2002/085829A1
A process for production of dimers of aromatic monohydroxyl compounds, characterized by conducting the oxidative coupling of an aromatic compound represented by the general formula [I]: Ar-OH [I] (wherein Ar is an optionally substituted ...  
WO/2002/083611A1
A process for the manufacture of a polyphenol compound such as bisphenol-A by introducing into a reaction zone a phenolic compound reactant, a carbonyl compound reactant, and a catalyst promoter comprising a dithioketal compound, and rea...  
WO/2002/081047A1
The invention relates to a method for eliminating oxygenated organic molecules, such as organic acids and alcohols, which are present in a liquid or gaseous organic effluent. The inventive method is characterised in that the elimination ...  
WO/2002/079130A1
The present invention relates to a process for the preparation of alkylated dihydroxybenzene by alkylating dihydroxy benzene with tertiary butyl alcohol in the presence of a solid/acid polymer catalyst.  
WO/2002/072516A1
A method for producing bisphenol A through condensing phenol and acetone using a sulfonic acid based ion exchange resin as a catalyst and a mercaptan as an auxiliary catalyst, characterized in that use is made of a sulfonic acid based io...  
WO/2002/072517A1
The invention relates to a method for purifying dihydroxydiphenyl of general formula (I), wherein R and R' independently of one another represent H or a C¿1?-C¿4? alkyl group, preferably H. Said method consists of a recrystallisation w...  
WO/2002/072515A1
A method for producing bisphenol A wherein phenol is fed continuously to a first stage reactor of a fixed bed multi-stage reactor system having at least two reactors packed with a cation exchange resin, while acetone is fed continuously ...  
WO/2002/070444A1
In post-treatment steps for a liquid reaction mixture obtained by condensing excess phenol with acetone in the presence of an acid catalyst, the step of filtration with a filter is conducted in at least one step between the step of disso...  
WO/2002/070446A1
The thermal stability of a bisphenol compound is improved. A pyridine compound is incorporated into the bisphenol compound.  
WO/2002/070443A1
A process for producing bisphenol A by condensing phenol with acetone with the aid of an acid-form ion-exchange resin catalyst partly modified with a sulfurized amine compound, wherein the modified acid-form ion-exchange resin is one hav...  
WO/2002/070442A1
The present invention relates to a process for preparing phenols, in which the pH of the reaction product from the acid-catalyzed cleavage of alkylaryl hydroperoxides is set to a value of at least 8 at a temperature of at least 100°C pr...  
WO/2002/070445A1
The presetn invetion relates to a methdo of neutralizing residual acid species in crude dihydric phenol comprising the step of introducing a thermally stable organic base selected from teh group consisting of tetraalkyl phosphomium hydro...  
WO/2002/064537A1
The present addendum certificate relates to a method for obtaining purified hydroxytyrosol from products and by-products derived from the olive tree by means of two-step chromatographic treatment. The invention uses a non-activated ion e...  
WO/2002/064531A1
The invention relates to a method for producing high-purity diisobutene by reacting isobutene or isobutene-containing hydrocarbon mixtures on a solid acid ion exchange resin containing sulfonic acid groups, the protons of said groups bei...  
WO/2002/064536A1
The invention relates to a method for extracting, fractionating and purifying polyphenol compounds originating from leafy edible plants from the Compositae family, bulb plants from the Liliaceae family or fresh vegetable culls, in which ...  
WO/2002/062736A1
A diphenol represented by the general formula (I) (I) wherein X represents a divalent cyclic hydrocarbon group selected among 1-cyclohexen-1,4-ylene, 1,4-cyclohexylene, and p-phenylene; R represents C¿1-4? alkyl; and n is an integer of ...  
WO/2002/059069A1
The invention concerns a continuous method for making bisphenol A which consists in: reacting phenol and acetone in the presence of a strong acid catalyst and a co-catalyst; said method is carried out by using as co-catalyst a dithioethe...  
WO/2002/057206A1
A process for producing bisphenol A which comprises using a cation-exchange resin as a catalyst optionally together with a free mercaptan as a promoter to condense phenol with acetone, wherein the acetone/phenol molar ratio is increased ...  
WO/2002/057207A1
This invention relates to an Eco-friendly method of preparation of high purity tetrabromobisphenol-A through the bromination of bisphenol-A (BPA) with a combination of bromide and bromate ions in organic solvent and water, reacting bromi...  
WO/2002/055465A1
A method for carrying out a reaction of one substance capable of being activated by a catalyst with another substance capable of reacting with said one substance activated, characterized in that the substance capable of being activated i...  
WO/2002/055462A1
A process for producing bisphenol A which comprises using a cation-exchange resin as a catalyst and a free mercaptan as a promoter to condense phenol with acetone, wherein the superficial feedstock velocity in the reaction column packed ...  
WO/2002/055461A1
Disclosed is a process for the preparation of dialkyl aromatic hydroxyl compounds such as dialkylphenols, dialkylbenzenediols, diakylnaphthols and dialkylnaphthalenediols, especially 2,5-dialkyl-hydroquinone, by contacting an aromatic hy...  
WO/2002/053517A2
An improved method is described for making 9-deoxy-PGF¿1?-type compounds. In contrast to the prior art, the method is stereoselective and requires fewer steps than the known methods for making these compounds.  
WO/2002/053521A1
A process for producing bisphenol A which comprises using a cation-exchange resin as a catalyst and a free mercaptan as a promotor to condense phenol with acetone, wherein the phenol and acetone are fed to a multistage reactor comprising...  
WO/2002/050000A1
The acid catalyzed condensation of phenol with acetone in the presence of a thiol promoter to produce bisphenol A is found to occur with greater overall selectivity when the catalyst employed is an amine modified acidic resin catalyst. A...  
WO/2002/046133A1
The present invention claims a process for separating phenol from a mixture comprising at least hydroxyacetone, cumene, water and phenol, which comprises fractionating the mixture by means of a single fractional distillation step and a s...  
WO/2002/046132A1
The present invention claims a process and an apparatus for the work-up by distillation of cleavage product mixtures produced in the cleavage of alkylaryl hydroperoxides. Usually, in the work-up by distillation of cleavage product mixtur...  
WO/2002/045856A1
The invention relates to a method for removing aromatic hydroxy compounds from fluids that contain an aromatic hydroxy compound and at least one ring alkylation product. The method is characterized by contacting the fluid with an anion e...  
WO/2002/044119A2
The present invention relates to a one-pot process for preparing a compound of formula (I): I;by reacting a compound of formula (II) with a compound of formula (III): in the presence of a suitable solvent, a suitable base, a palladium ca...  
WO/2002/044145A1
There is provided a compound of formula (I) wherein R?a¿, R?1¿, R?2¿, Y and R?3¿ have meanings given in the description and pharmaceutically-acceptable derivatives (including prodrugs) thereof, which compounds and derivatives are use...  
WO/2002/040435A1
Process and related apparatus are disclosed for economically producing a very high quality bisphenol A product by a multistage crystallization process utilizing a new cross-flow wash design whereby a high purity wash phenol stream is fed...  
WO/2002/040492A1
The invention concerns novel chiral diphosphines (R) or (S), and their use as optically active ligand for preparing diphosphino-metallic complexes. The invention also concerns the diphosphino-metallic complexes containing said chiral dip...  
WO/2002/034672A1
The invention relates to a method for the production of zeolite catalysts, containing transition group metals, by means of hydrothermal synthesis with subsequent calcification, characterised in that the transition group metal is used in ...  
WO/2002/032420A1
The invention relates to a method for producing an extract from cannabis plant matter, containing tetrahydrocannabinol, cannabidiol and optionally the carboxylic acids thereof. According to said method, the dried plant matter is ground a...  
WO/2002/028528A1
The invention relates to a supported catalyst consisting of metal of the platinum group. Said catalyst can be obtained by means of controlled electroless deposition of at least one metal of the platinum group from a precipitation solutio...  
WO/2002/028527A1
The invention relates to a method for producing catalysts by depositing at least one metal of the platinum group on a non-porous, non-metallic carrier without using an electric current. The invention also relates to the catalysts obtaine...  
WO/2002/026681A1
Reaction of a phenol with a metal salt of an alcohol produces a metal phenolate salt of a phenol. When a hindered phenol is used a indered metal phenolate is produced. Such hindered metal phonolate salts are useful in driving the synthes...  
WO/2002/026863A1
Aromatic polycarbonates excellent in physical properties and hue are produced via simplified steps as compared with those of the prior art. A process for the production of aromatic polycarbonates which comprises the following steps (1) t...  
WO/2002/026839A2
The invention relates to a method for the production of polyisobutenylphenoles by alkylation of an aromatic hydroxy compound with substantially singly ethylenically unsaturated and substantially homopolymer polyisobutenes in the presence...  
WO/2002/026840A2
The invention relates to a method for producing polyisobutenylphenols by alkylation of an aromatic hydroxy compound with substantially singly ethylenically unsaturated polyisobutylenes substantially homopolymers in the presence of a Lewi...  
WO/2002/024335A2
A strong-acid cation exchange resin in acid form is contacted with an alkylcarbamoyl alkylthioester in the presence of water for producing a strong-acid cation exchange resin comprising a plurality of acid groups being partially neutrali...  
WO/2002/024618A1
A process for preparing 3,5-bisalkylphenols (2) from carbinol compounds (1); carbinol compounds (1); and a process for preparation of the compounds (1): (1) (2) [wherein R?1¿ is hydrogen, alkali metal, alkaline earth metal, or a hydroxy...  
WO/2002/022531A1
Phenol and isopropenylphenol are recovered from BPA tars by sparging the fluidized BPA tar while heating in the presence of a basic catalyst. Sparging dramatically increases the efficiency of phenol and isopropenylphenol recovery. Recove...  
WO/2002/022535A1
A process for producing 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC) by reacting phenol with 3,3,5-trimethylcyclohexanone (TMC) in the presence of an acid catalyst, characterized by initiating the reaction of phenol with T...  
WO/2002/022533A1
A process for producing 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC) by reacting phenol with 3,3,5-trimethylcyclohexanone (TMC) in the presence of an acid catalyst, separating crystals of a phenol adduct of BPTMC from the ...  
WO/2002/022532A1
A distillation process wherein a feed mixture comprising phenol, acetone and cumene is fed to a point intermediate between the top and bottom of a distillation column, an overhead stream comprising acetone is withdrawn from a point adjac...  
WO/2002/022534A1
A method for producing 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, wherein phenol and 3,3,5-trimethylcyclohexanone (TMC) are reacted in the presence of an acid catalyst, the resultant reaction mixture is neutralized by the addi...  
WO/2002/022236A1
Injection of even very small amounts of supplemental water to the spent-air stream at points upstream from the heat exchanger cooler(s) used in processing spent-air streams from a cumene-to-phenol process allows these heat exchanger cool...  
WO/2002/022536A1
A method for producing high purity 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC), which comprises reacting phenol and 3,3,5-trimethylcyclohexanone in the presence of an acid catalyst in a slurry containing crystals of a ph...  

Matches 1,101 - 1,150 out of 7,063