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Class Information
Number: 562/600
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Carboxylic acids and salts thereof > Acyclic > Unsaturated > Purification or recovery per se
Description: Processes directed to the purification, separation, or recovery of acyclic unsaturated carboxylic acids.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7622607 |
Method for purifying (meth)acrylic acid obtained by oxidizing a gaseous substrate |
Nov. 24, 2009 |
| 7612231 |
Method for recovering acrylic acid |
Nov. 3, 2009 |
| 7601865 |
Recovery of organic acids |
Oct. 13, 2009 |
| 7601866 |
Process for removing methacrolein from liquid phase comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component |
Oct. 13, 2009 |
| 7589236 |
Process for separating acrylic acid and benzoic acid present in a product gas mixture of a partial heterogeneously catalyzed gas phase oxidation of a C.sub.3 precursor compound of acrylic acid |
Sep. 15, 2009 |
| 7566804 |
Process for preparing acrylic acid |
Jul. 28, 2009 |
| 7560590 |
Rectificative separation of an acrylic acid-containing liquid |
Jul. 14, 2009 |
| 7557246 |
Method for the purification of (meth)acrylic acid |
Jul. 7, 2009 |
| 7557245 |
(Meth)acrylic acid crystal and process for producing aqueous (meth)acrylic acid |
Jul. 7, 2009 |
| 7540884 |
Method for performing the purifying separation of crystals out their suspension in a mother liquor |
Jun. 2, 2009 |
| 7541417 |
Process for the purification of dihydric phenols |
Jun. 2, 2009 |
| 7538245 |
Process for the manufacture of an enantiopure compound |
May. 26, 2009 |
| 7528210 |
Method of purification of dihydric phenols |
May. 5, 2009 |
| 7520964 |
Method for the rectifying separation of fluids containing (meth)acryl monomers |
Apr. 21, 2009 |
| 7514581 |
Method for purifying and producing acrylic acid |
Apr. 7, 2009 |
| 7495129 |
Purification of a monomer by extraction with a phase former and crystallization |
Feb. 24, 2009 |
| 7476299 |
Vessel for easily polymerizable compound |
Jan. 13, 2009 |
| 7473338 |
Distillation apparatus for readily polymerizable compound |
Jan. 6, 2009 |
| 7414150 |
Method for purifying (meth)acrylic acid |
Aug. 19, 2008 |
| 7396957 |
Process for producing (meth)acrylic acids and process for distilling the same |
Jul. 8, 2008 |
| 7393436 |
Thermal separating process for removing at least one stream containing enriched (meth) acrylic monomers |
Jul. 1, 2008 |
| 7393976 |
Process for manufacturing reduced water content (meth)acrylic acid |
Jul. 1, 2008 |
| 7381839 |
Method for producing acrylic acid |
Jun. 3, 2008 |
| 7368601 |
Process for producing (meth)acrylic acids and process for distilling the same |
May. 6, 2008 |
| 7368602 |
Process for producing (meth) acrylic acid |
May. 6, 2008 |
| 7351396 |
Extraction process for removal of impurities from an aqueous mixture |
Apr. 1, 2008 |
| 7351310 |
Rectificative separation of fluids comprising (meth) acrylic monomers |
Apr. 1, 2008 |
| 7342130 |
Method for producing acrylic acid |
Mar. 11, 2008 |
| 7332624 |
Method for production of acrylic acid |
Feb. 19, 2008 |
| 7332626 |
Method for production of (meth) acrylic acid |
Feb. 19, 2008 |
| 7326323 |
High capacity purification of thermally unstable compounds |
Feb. 5, 2008 |
| 7326811 |
Method for production of (meth)acrylic acid by use of a shell-and-tube heat exchanger |
Feb. 5, 2008 |
| 7321060 |
Method for production of acrylic acid |
Jan. 22, 2008 |
| 7319168 |
Process for producing aliphatic carboxylic acid |
Jan. 15, 2008 |
| 7319169 |
Method for producing (meth) acrylic acid |
Jan. 15, 2008 |
| 7319166 |
Method of purifying a raw melt of at least one monomer by crystallization |
Jan. 15, 2008 |
| 7319167 |
Method for distilling (meth)acrylic acid and/or the ester thereof |
Jan. 15, 2008 |
| 7307189 |
Method for discontinuous purification of crude acrylic acid by means of crystallization |
Dec. 11, 2007 |
| 7307132 |
Method for producing low-odor hydrogel-forming polymers |
Dec. 11, 2007 |
| 7304176 |
Process for producing easily polymerizable substance |
Dec. 4, 2007 |
| 7300555 |
Method for the rectifying separation of liquids containing (meth)acrylic monomers in a rectification column |
Nov. 27, 2007 |
| 7294240 |
Method for producing (meth)acrylic acid esters |
Nov. 13, 2007 |
| 7282118 |
Method for production of easily polymerizable substance and purification apparatus |
Oct. 16, 2007 |
| 7279598 |
Process for separating and recovering 3-hydroxypropionic acid and acrylic acid |
Oct. 9, 2007 |
| 7279076 |
Apparatus and method for handling easily polymerizable substance, apparatus for extracting liquid from apparatus under reduced pressure, and process for producing easily polymerizable substanc |
Oct. 9, 2007 |
| 7279075 |
Thermal separating process between at least one gaseous and at least one liquid stream, of which at least one comprises (meth)acrylic monomers |
Oct. 9, 2007 |
| 7265241 |
Method for purifying (meth)acrylic acid |
Sep. 4, 2007 |
| 7258766 |
Method for collecting acrylic acid |
Aug. 21, 2007 |
| 7253313 |
Method for purifying (meth)acrylic acid by oxidising a gaseous substrate |
Aug. 7, 2007 |
| 7253314 |
Method for refining easily polymerizable matter-containing substance and apparatus therefor |
Aug. 7, 2007 |
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