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WO/1998/003241A1 |
An installation for purifying particulate solids, especially a salt purification facility, comprises a vertically standing purification vessel (1) which has on top a fill aperture (10) for the solids to be purified, below an outlet apert...
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WO/1998/001204A1 |
The invention concerns a continuously operated, two-part crystallizer which is particularly suitable for the cleavage of racemic mixtures. The invention also concerns a process using said crystallizer for separating solids mixtures which...
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WO/1997/046526A1 |
Donepezil hydrochloride, 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-yl]methylpiperidine hydrochloride, is provided here in the form of four polymorphs which are stable against heat and humidity in the pharmaceutical use. They can be industr...
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WO/1997/041271A1 |
A method of producing sodium carbonate crystals (34) from a sodium carbonate-containing solution (14) including the steps of passing the sodium carbonate solution (14) to a precipitator (12), adding methanol (16) to the sodium carbonate ...
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WO/1997/032644A1 |
A process is described for separating a desired substance from an aggregate mixture in which process a three-phase dispersion is formed, the first phase comprising droplets containing the aggregate mixture, the second phase comprising a ...
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WO/1997/024303A1 |
A method for efficiently purifying a particular substance contained in a raw material mixture, comprising the steps of: (1) subjecting the raw material mixture in a liquid form or a slurry form wherein part of the particular substance ha...
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WO/1997/024302A1 |
A method for purifying a particular substance contained in a mixture, comprising the following steps (1) and (2a) or (2b) and permitting a particular substance having high purity to be relatively simply recovered in a high yield from a m...
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WO/1997/018879A1 |
A process for supercooling a liquid or solid wherein the solid or liquid is placed in contact with a coolant, the coolant having a temperature of at or just above the metastable limit temperature of the liquid or solid.
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WO/1997/014777A1 |
A method for crystallising fat to enable later fractionation, in particular by pressure filtering, wherein the fat is melted, the molten mass is divided into beads, the beads are fed into a pre-refrigerated aqueous solution, the fat conc...
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WO/1997/007121A1 |
Processes for the depletion of 7-ADCA in mixtures of vinyl-ACA with 7-ADCA via novel salts of vinyl-ACA or via chromatography.
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WO/1996/032095A1 |
A process for producing a pharmaceutical powder for inhalation comprising crystalline particles of an inhalation compound, comprising dissolving an inhalation compound in a solvent; and introducing the solution containing the inhalation ...
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WO/1996/026781A1 |
A method of controlling the crystallization of biopolymers such as proteins, which comprises bringing into contact with a biopolymer-containing buffer solution (14) a silicon crystal (15) with the valence electrons thereof so controlled ...
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WO/1996/027028A1 |
The invention relates to a method for the recovery of xylose from xylose-containing aqueous solutions containing 30-60 % by weight of xylose on dissolved solids, in which method the solution is treated to produce a solution supersaturate...
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WO/1996/027029A1 |
The invention relates to a method for recovering a crystallisable organic compound from solutions containing said compound. In accordance with the method, the compound is crystallized substantially by way of nucleation from a solution ha...
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WO/1996/022262A1 |
A method for producing para-xylene from a xylene-containing feedstock, wherein a first fraction is enriched to at least 30 wt.% with para-xylene, and said fraction is purified by means of at least one high-temperature crystallisation ste...
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WO/1996/020908A1 |
Process for producing very pure paraxylene from a charge containing a mixture of aromatic hydrocarbons having from 7 to 9 carbon atoms, wherein is circulated at least a portion of the charge in a zone adapted to enrich a first fraction w...
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WO/1996/020907A1 |
Method for the separation of high purity paraxylene from a charge containing xylene isomers comprising the steps of selective adsorption (8) of a paraxylene-rich fraction, at least one stage for crystallizing (5a) said fraction at a high...
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WO/1996/019421A1 |
In a chemicals crystallisation process, chemicals are at first molten then introduced into a container where they crystallise by heat extraction, are conveyed through the container and collected as a product. The process is characterised...
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WO/1996/018597A1 |
Crystallization of adipic acid using low intensity ultrasonic agitation during crystallization results in purer product that is more readily handled. Apparatus for carrying out the process is also disclosed.
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WO/1996/014449A1 |
A surface-cooled fluid bed crystallizer apparatus (10) and method are disclosed wherein submerged heat exchanger surfaces (typically heat exchanger tubes (14) or plates through which a coolant is passed) are bathed with a stream of gas b...
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WO/1996/013316A1 |
The invention relates to a process and apparatus for the preparation of open macropore crystals from solution by using a desalting in gas form, wherein the transformation of the desalting agent into gas-form is implemented from a solutio...
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WO/1996/007461A1 |
The invention concerns the exploitation of the process of initiating and/or accelerating and/or controlling crystallization or precipitation in supercooled melts or supersaturated solutions of solids. A problem frequently encountered wit...
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WO/1996/005279A1 |
A pseudo-steady state fractionation of a polymorphic fat, resulting in a product which is in a kinetically stable crystal form is performed in a way that a 'sigma'-value is maintained below 0.5, formula (I) wherein Sc being: the percenta...
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WO/1995/035475A1 |
An orbital rod drive arrangement for an orbital tube whip rod heat exchanger includes a single drive plate (12) driving a plurality of countercranks (18), each countercrank (18) supporting a whip rod (24) from its upper end within a tube...
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WO/1995/032040A1 |
A method of producing sodium carbonate from trona including the steps of passing a solution containing trona (14) to a precipitator (17), adding alcohol (16) to the solution in the precipitator so as to precipitate carbonate from the sol...
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WO/1995/030466A1 |
A process and device are disclosed for separating substances by crystallization of molten material. In order to bring about crystallization, the molten material is fed into the gap between two opposing moving walls which can be cooled; t...
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WO/1995/030478A1 |
Wash columns as used to remove impurities from the residual melt from melt crystallization are of limited efficiency due to the fact that the crystal mass normally fed in contains solids of different sizes, which partially also tend to a...
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WO/1995/026931A1 |
An installation for the targeted formation of germs or crystals on the surface of a dielectric in contact with a solution, especially on the functional groups of a polymer, in which there is a device for generating an electric field in t...
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WO/1995/026947A1 |
This invention is a crystallization process for p-xylene recovery. A single temperature crystallization stage (18) is used for producing p-xylene from a feed having an above equilibrium p-xylene concentration, such as from toluene dispro...
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WO/1995/018086A1 |
A method for recovering crystalline 2-6-dimethylnaphthalene comprising crystallizing in a scraped-wall crystallizer apparatus at crystallization temperature T, a mixture of low melting components (LM), having melting points of 70 �F an...
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WO/1995/013132A1 |
A method for providing aerogels, and aerogels produced according to the method, is described. As one aspect, antiperspirant compounds that are in aerogel form, and antiperspirant and deodorant compositions including such salts, are descr...
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WO/1995/004583A1 |
Methods and reaction systems are disclosed that are adapted for forming crystallites having novel crystal habits and/or morphologies compared to conventional crystallites of the same chemical composition. The methods and reaction systems...
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WO/1995/004123A2 |
Triglyceride oil crystallisation modifying substance being membrane lipids which are comprised by the groups (I) lipids having the formula C13H27-CH=CH-CH(OH)-CH(NHCOR2)-CH2-OR4, C13H27- is an unbranched alkyl chain, R4 is hydrogen or R3...
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WO/1994/022546A1 |
A method and a device for recovering crystals from a solution by evaporation with crystallisation in an evaporation plant having at least two stages are disclosed. In the method, the crystallised salt is separated in each evaporation sta...
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WO/1994/019083A1 |
This invention provides a process for preparing high purity and large size crystals by eliminating fine crystals in crystal slurry in a crystallizer, characterized in: mounting two filters (4, 6) in the crystallizer (5); discharging part...
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WO/1994/019082A1 |
A slurry containing crystals in an impurity-containing mother liquor under elevated pressure and temperature conditions is processed to separate the crystals from the mother liquor. The processing comprises highly efficient separation an...
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WO/1994/016362A1 |
The present invention is directed to a method for the recovery of erythorbates from photographic solutions. In the disclosed method, the photographic solution is first acidified by passing it over an acidic cation exchange resin and the ...
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WO/1994/013630A1 |
A process for obtaining carbamide involves synthesizing carbamide from initial components and crystallizing the resulting aqueous solution of carbamide until the supersaturation temperature of the solution is reached while simultaneously...
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WO/1994/012460A1 |
A process is disclosed for the production of a product which is enriched in a desired enantiomer of a phenylpropionic acid selected from ibuprofen and flurbiprofen, or their pharmaceutically acceptable salts, which comprises the followin...
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WO/1994/007582A1 |
There is disclosed a dual jet crystallizer apparatus comprising a crystallization or mixing chamber (10) having opposed angularly disposed arms (11) which removably receive jet nozzles (13). One end of the chamber is provided with means ...
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WO/1994/002453A1 |
(S)-N5-[Imino(methylamino)methyl]ornithine hydrochloride, pharmaceutical compositions containing it, its us in medicine and its preparation is described.
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WO/1993/024441A1 |
A process for the production of purified terephthalic acid (PTA) from crude terephthalic acid (CTA) comprising mixing the CTA with an aqueous medium to form an aqueous CTA mixture, heating the mixture to dissolve substantially all of the...
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WO/1993/019826A1 |
In a continuous crystallization process employing an evaporative draft tube baffle (DTB) crystallizer apparatus to produce crystal product, the improvement which is feeding at constant rate to the body of slurry a suspension of crystals ...
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WO/1993/018359A1 |
In this system, an absorption solution consisting of a common salt and water is circulated through the Immediate Heat Upgrading Absorption (IHUA) air handlers (1a, 1b, 1c, 1d) to upgrade heat taken from a first air mass or water and rele...
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WO/1993/006065A1 |
Described are a method and a device for reducing the grain size of crystalline explosive. The coarse-crystalline explosive is first dissolved in an organic solvent. The dissolved explosive is subsequently transferred to a precipitation v...
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WO/1992/020420A1 |
The invention provides a method of solidifying a liquid including the steps of reducing the temperature of the liquid below its melting point and subjecting the liquid to a physical disturbance, preferably irradiating the undercooled or ...
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WO/1992/020760A1 |
Waxy liquid hydrocarbons can be dewaxed employing autorefrigerative dewaxing solvents such as C2-C4 aliphatic hydrocarbon solvents, preferably propane, propylene, butane, butylene, and mixtures thereof, by using a centrifuge (3) as the d...
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WO/1992/012392A1 |
The invention described is an apparatus for heating or cooling solid suspension slurry. The apparatus comprises a vessel (1) for containing the slurry and a draft means contained within a draft section of a draft tube (2) to circulate an...
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WO/1992/004429A1 |
A process for separating undesired foreign substances from vegetable, animal and maritime oils and fats. During refining or fractionated crystallisation, an electrostatic field is generated in the oil to be treated by means of at least o...
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WO/1992/000130A1 |
A method and an apparatus for crystallizing a mineral substance in a fluidized bed of crystals (14) generated by circulating a supersaturated solution of the substance to be crystallized upwards through a fluidized bed reactor distributo...
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