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Class Information
Number: 23/299
Name: Chemistry: physical processes > Physical processes > Crystallization > With extraction
Description: Processes combined with a step of physical extraction or dissolving, before or after crystallization.

Patents under this class:

Patent Number Title Of Patent Date Issued
8709497 Mineral, nutritional, cosmetic, pharmaceutical, and agricultural compositions and methods for producing the same Apr. 29, 2014
8641786 Rotating knife, washing column, and method for disintegrating a crystal bed in a washing column Feb. 4, 2014
8486158 Method and device for continuously producing a crystallite having a constant particle size distribution Jul. 16, 2013
8425626 Method for processing molasses Apr. 23, 2013
8158075 Etching solution reproducing apparatus and etching solution reproduction method Apr. 17, 2012
7807119 Bayer process for production of alumina trihydrate, the said improvement relating to separation of aluminate liquor and insoluble residues Oct. 5, 2010
7794600 Purification of nanocrystal solutions by chromatography Sep. 14, 2010
7740775 Method for the production of particles Jun. 22, 2010
7611208 Methods for constructing underground borehole configurations and related solution mining methods Nov. 3, 2009
7332085 Method for the purification of an .alpha.-hydroxy acid on an industrial scale Feb. 19, 2008
7311837 Process for the continuous recovery of free tartaric acid from raw materials containing potassium hydrogentartrate Dec. 25, 2007
7270752 Process for purifying lactams Sep. 18, 2007
7211193 Processes for the purification of bis(2-hydroxyethyl)terephthalate May. 1, 2007
6960300 Process for preparing water soluble diterpenes and their applications Nov. 1, 2005
6896807 Capacitor electrolyte recovery May. 24, 2005
6855176 Emulsion crystallisation with recycle Feb. 15, 2005
6346523 Budesonide particles and pharmaceutical compositions containing them Feb. 12, 2002
6221153 Method for producing large crystals of complex molecules Apr. 24, 2001
5851490 Method for utilizing PH control in the recovery of metal and chemical values from industrial waste streams Dec. 22, 1998
5846501 Process for the selective recovery of the salt constituents from used hardening shop salts which contain nitrite-nitrate Dec. 8, 1998
5314506 Crystallization method to improve crystal structure and size May. 24, 1994
5230769 Process and apparatus for separating substances by crystallization Jul. 27, 1993
5104478 Method for making single crystals Apr. 14, 1992
5090965 Process for the separation of substances by cooling crystallization Feb. 25, 1992
4822585 Silicon purification method using copper or copper-aluminum solvent metal Apr. 18, 1989
4734102 Process for concentrating a suspension Mar. 29, 1988
4729888 Process of recovery of sulphur from minerals containing pyrites Mar. 8, 1988
4657559 Process for seed crystal preparation for phosphoric acid crystallization Apr. 14, 1987
4655789 Phosphoric acid crystallization process Apr. 7, 1987
4655790 Phosphoric acid crystallization process Apr. 7, 1987
4597768 Method for treatment in counter current of suspended particles with a liquid Jul. 1, 1986
4507244 Method for crystallizing a substance from a solution Mar. 26, 1985
4385902 Process for purifying crystalline potassium chloride May. 31, 1983
RE30411 Process for purifying sodium hydroxide Oct. 7, 1980
4087253 Method of obtaining caustic soda from a sodium chloride liquor containing sulphate ions recovered from an electrolytic cell May. 2, 1978
4072472 Production of high purity salt from high sulfate salt deposits Feb. 7, 1978
4065270 Process for purifying sodium hydroxide Dec. 27, 1977
3953582 Process for the separation of sodium azide Apr. 27, 1976

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