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Class 23/297 - With extraction


Subclass of Class 23 - Chemistry: physical processes
Definition: Processes carried out in solution, in combination with a
No. of patents: 26
Last issue date: 07/29/2008


NumberTitleIssue Date
7404828Method for the production of particles
A method of preparing particles of a substance, for example selected from a flavor, fragrance, pigment, dye, biologically active compound or a plastics material, comprises contacting the substance of a formulation (which may include the substance in conjunction with...
07/29/2008
7166264Processes for purifying phosphoric acid and for preparing phosphoric acid
A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile components; heating the crude phosphoric acid liquid to a temperature above 25...
01/23/2007
7083768Processes for purifying phosphoric acid and for preparing phosphoric acid
A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile components; heating the crude phosphoric acid liquid to a temperature above 25...
08/01/2006
7041268Process for recovery of sulphate of potash
The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ...
05/09/2006
7014832Simultaneous recovery of potassium chloride and KCL enriched edible salt
The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density...
03/21/2006
7001526Optical isomer separation method
Methods for separation of two optical isomers in a racemate into its constituent isomers by statistical means are described, whereby the saturated racemate solution is first allotted into small samples by means of microfluidic or inkjet techniques to obtain small sa...
02/21/2006
6855176Emulsion crystallisation with recycle
A method for purifying substances through emulsion crystallisation is described, whereby (a) an emulsion of organic liquid droplets in a continuous water phase containing the impure substance is formed; (b) the emulsion is super-saturated in the substance; (c) cryst...
02/15/2005
6346523Budesonide particles and pharmaceutical compositions containing them
The invention provides finely divided, substantially crystalline particles of budesonide characterized in that they are substantially smooth and having a BET value from 1 to 4.5 m2 /g, process for their preparation, a pharmaceutical composition...
02/12/2002
6027607Salt extraction process and device
A process for extracting salt from brine contained in at least one open evaporation basin. At least part of the brine is heated in a heating unit located outside the evaporation basis and returned to the evaporation basin. The heating unit is driven by wa...
02/22/2000
5840085Process for removing sodium chloride and potassium salts from ash collected from a soda recovery boiler
This invention relates to a process for removing sodium chloride and potassium salts, which are impurities concentrated and accumulated in pulp digesting chemicals, from ash collected from a soda recovery boiler. This process comprises the steps of (a) mi...
11/24/1998
5503641Process and apparatus for preparing a potassium chloride mixture
A potassium chloride mixture with grains of different sizes is extracted in a first stage with an unsaturated solution at an elevated temperature, whereby the finest grains are completely dissolved and the coarse proportions are caused to start dissolutio...
04/02/1996
5104478Method for making single crystals
A method for making single crystals, comprising osmotically removing the solvent from a solution containing the material to be grown into a crystal....
04/14/1992
5028302Purification of chlor-alkali membrane cell brine
This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions s...
07/02/1991
4997637Digestive crystallizing process and apparatus for purification of KC1
Disclosed is a method of reducing the sodium chloride content of potassium chloride by forming an aqueous slurry of potassium chloride feed crystals having a wide particle size distribution with an average diameter of about 0.1 to about 50 microns in a li...
03/05/1991
4822585Silicon purification method using copper or copper-aluminum solvent metal
A method for purifying silicon comprises the steps of providing a body of molten silicon-rich material in a solvent metal comprising copper or copper-aluminum combination and extracting heat therefrom to provide a solid phase containing silicon in crystal...
04/18/1989
4734102Process for concentrating a suspension
An apparatus for concentrating a suspension consisting of a hollow cylinder in which one or more tubes of a constant outward diameter extend in axial direction, in the wall of each tube at least one filter being mounted forming the only direct connection ...
03/29/1988
4683034Process for separating dimethyl isophthalate and dimethyl orthophthalate from their mixture with dimethyl terephthalate
The invention relates to a process for separating dimethyl isophthalate (DMI) and dimethyl orthophthalate (DMO) and other by-products from their mixture with dimethyl terephthalate (DMT), formed in the oxidation of p-xylene followed by esterification with...
07/28/1987
4657559Process for seed crystal preparation for phosphoric acid crystallization
The present invention relates to the processing of phosphoric acid by crystallization starting with phosphoric acid and adding relatively large amounts of fine, relatively pure seed crystals to acid which has been cooled to supersaturated conditions. Crys...
04/14/1987
4655789Phosphoric acid crystallization process
The present invention discloses a new method for obtaining a crystallized phosphoric acid of relatively high purity starting with conventional phosphoric acid. The new method is based on crystallization of orthophosphoric acid hemihydrate from the phospho...
04/07/1987
4544391Method for separation of solid mixtures by simultaneous multi-stage recrystallization
A method for separating a desired component from a solid mixture by repeated recrystallization in a single vertical crystallizer having a plurality of chambers partitioned by solid-liquid separation means, which comprises intermittently feeding a solid mi...
10/01/1985
4333737Reclamation of materials from photoflash cartridges
A process is provided for reclaiming materials from photoflash cartridges ich are comprised of aluminum, barium nitrate and potassium perchlorate. The photoflash composition is dumped into heated water to dissolve barium nitrate and potassium perchlorate ...
06/08/1982
4271131Production of highly pure lithium chloride from impure brines
Highly pure lithium chloride suitable for use in production of lithium metal by electrolysis is obtained directly from impure natural or other lithium chloride brines by an integrated process in which the brine is first concentrated by solar energy to a l...
06/02/1981
4087253Method of obtaining caustic soda from a sodium chloride liquor containing sulphate ions recovered from an electrolytic cell
A method of obtaining caustic soda and pure sodium chloride from an electrolytic cell liquor containing also sulfate ions including the steps of concentrating the liquor through multiple effect evaporation, cooling the concentrate obtained, separating the...
05/02/1978
4079116Process for producing ammonium heptamolybdate and/or ammonium dimolybdate
A process for producing a high purity ammonium heptamolybdate and/or ammonium dimolybdate product by which a particulated molybdenum oxide concentrate is purified to remove contaminating metal cations, whereafter it is leached with an ammoniacal leach sol...
03/14/1978
4072472Production of high purity salt from high sulfate salt deposits
A subterranean salt deposit is solution mined, and the resulting calcium- and sulfate-contaminated brine is treated, e.g., by soda ash, to precipitate insoluble calcium compounds. The resulting slurry is settled, and the effluent clear brine is evaporated...
02/07/1978
3994531Method of solution mining potassium chloride from subterranean deposits
The present invention relates to an improved method of solution mining potassium chloride from subterranean ore deposits containing both potassium chloride and sodium chloride. By the present invention, an aqueous medium is passed through the ore deposits...
11/30/1976
 
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