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| Number | Title | Issue Date |
| 8143444 | Recovery of organic acids A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. An amine and CO2 are introduced to the solution to form the insoluble carbonate salt and a complex bet... | 03/27/2012 |
| 8106240 | Process for operating a continuous removal of a target product X in the form of fine crystals of the target product X A process for operating a continuous removal of a target product X in the form of fine crystals of a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in the secondary chamber of an ... | 01/31/2012 |
| 8044237 | Method for production of aqueous (meth)acrylic acid The present invention relates to recovery of aqueous (meth)acrylic acid by condensation of a (meth)acrylic acid-containing stream to produce aqueous (meth)acylic acid having a higher concentration of (meth)acrylic acid and a lower concentration of formaldehyde, i.e.... | 10/25/2011 |
| 8044238 | Method for production of purified (meth)acrylic acid The present invention relates to reducing corrosion of distillation equipment during azeotropic distillation of (meth)acrylic acid in the presence of dissolved copper, by providing aqueous (meth)acrylic acid having not more than 0.1% by weight formaldehyde, based on... | 10/25/2011 |
| 7897814 | Method for extracting methacrylic acid Disclosed is a method for extracting methacrylic acid, in which an extraction solvent is added to a methacrylic acid aqueous solution for transferring methacrylic acid to the extraction solvent. In this method, a solvent containing t-butyl methacrylate is used as th... | 03/01/2011 |
| 7820860 | Method for separating compound-forming chiral systems Methods for racemate separation for compound-forming substances. In this method, at least one fraction which is enriched with an enantiomer is produced in one method step. Finally, a preferred crystallization is carried out on the fraction. ... | 10/26/2010 |
| 7803969 | Continuous process for the production and purification of acrylic acid The invention relates to a process for the purification of (meth)acrylic acid in a process stage that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the moth... | 09/28/2010 |
| 7786323 | Method for collecting (meth)acrolein or (meth)acrylic acid and collecting device for the same (Meth)acrolein or (meth)acrylic acid is collected by bringing a reaction gas (1) containing (meth)acrolein or (meth)acrylic acid obtained through a vapor-phase catalytic oxidation reaction into contact with an aqueous solution as a collecting solvent in a col... | 08/31/2010 |
| 7732639 | Process for the preparation of acrylic acid comprising a partial oxidation of propane to propylene The invention relates to a method for preparing acrylic acid by oxidizing propylene and then acrolein, involving the recycling of gases that had not reacted by means of a partial oxidation of the propane, in parallel, at the end of the acrylic acid recovery step, th... | 06/08/2010 |
| 7714164 | Method for producing (meth) acrylic acid In a production method in which an acrylic acid-containing solution obtained from an acrylic acid-containing gas (or an acrylic acid-containing liquid obtained simply by subjecting the acrylic acid-containing solution to a separation process of reaction by-products)... | 05/11/2010 |
| 7705181 | Process for removing methacrylic acid from liquid phase comprising acrylic acid as a main constituent and target product, and methacrylic acid as a secondary component A process for removing methacrylic acid from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrylic acid as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crys... | 04/27/2010 |
| 7700804 | Process for transferring heat to a liquid mixture comprising at least one (meth)acrylic monomer A process for transferring heat to a liquid mixture comprising at least one (meth)acrylic monomer in an indirect heat exchanger, wherein a quaternary ammonium salt, a tertiary amine or a salt thereof with a Brønsted acid is added to the liquid mixture to reduce fou... | 04/20/2010 |
| 7632968 | Method for producing (meth) acrylic acid Disclosed is a method for producing (meth)acrylic acid comprising a process of recovering (meth)acrylic acid as aqueous (meth)acrylic acid solution from a (meth)acrylic acid-containing gas mixture produced by the catalytic gas phase oxidation of at least one reactan... | 12/15/2009 |
| 7622607 | Method for purifying (meth)acrylic acid obtained by oxidizing a gaseous substrate The present invention relates to a method for purifying (meth)acrylic acid obtained by catalytic or redox oxidation of a gaseous substrate constituting propane, propylene, acrolein, isobutane, isobutene, tert-butyl alcohol and/or (meth)acrolein or mixtures thereof b... | 11/24/2009 |
| 7612231 | Method for recovering acrylic acid Disclosed is a simplified method for recovering acrylic acid from a mixture containing acrylic acid, acrylic acid dimer and impurities with high boiling point, in a stable and efficient manner. The method comprises the steps of: introducing the mixture into an acryl... | 11/03/2009 |
| 7601866 | Process for removing methacrolein from liquid phase comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component A process for removing methacrolein from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals for... | 10/13/2009 |
| 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 Cprecursor compound of acrylic acid A process for separating acrylic acid and benzoic acid present in the product gas mixture of a partial oxidation to acrylic acid, in which the acrylic acid and the benzoic acid are first converted to a liquid phase, constituents having a lower boiling point than ben... | 09/15/2009 |
| 7566804 | Process for preparing acrylic acid A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C3 precursor of acrylic acid is fractionally condensed in a condensation column provided with internals as... | 07/28/2009 |
| 7560590 | Rectificative separation of an acrylic acid-containing liquid A process for rectificatively separating an acrylic acid-containing liquid, by withdrawing an acrylic acid-rich stream from the rectification column above the feed point and polymerization-inhibiting the upper section of the rectification column by means of diacryli... | 07/14/2009 |
| 7557245 | (Meth)acrylic acid crystal and process for producing aqueous (meth)acrylic acid The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containi... | 07/07/2009 |
| 7557246 | Method for the purification of (meth)acrylic acid The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid... | 07/07/2009 |
| 7514581 | Method for purifying and producing acrylic acid The objective of the present invention is to provide methods of efficiently purifying and producing acrylic acid by removing solid acrylic acid polymers dissolving and existing in crude acrylic acid supplied to purifying process. The purifying method of the present ... | 04/07/2009 |
| 7495129 | Purification of a monomer by extraction with a phase former and crystallization The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double ... | 02/24/2009 |
| 7414150 | Method for purifying (meth)acrylic acid A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid removed therefrom, is fed to and distilled in a first distillation c... | 08/19/2008 |
| 7396957 | Process for producing (meth)acrylic acids and process for distilling the same In the stopping and starting operations of a distillation column used for producing (meth)acrylic acids according to the present invention, upon stopping the operation of the distillation column, the heating of a reboiler attached thereto is interrupted and then the... | 07/08/2008 |
| 7393436 | Thermal separating process for removing at least one stream containing enriched (meth) acrylic monomers A thermal separating process for removing a stream containing enriched (meth)acrylic monomers from a mixture containing (meth)acrylic monomers, in which the liquid phases retained in the separating space at high temperature and high (meth)acrylic monomer content are... | 07/01/2008 |
| 7393976 | Process for manufacturing reduced water content (meth)acrylic acid A method is provided herein for purifying (meth)acrylic acid to provide a purified (meth)acrylic acid product having a low aldehyde concentration and not more than 0.2 wt % water. One embodiment of the method includes distilling (meth)acrylic acid in the presence of... | 07/01/2008 |
| 7381839 | Method for producing acrylic acid The objective of the present invention is to provide method for acrylic acid in which a generation of polymerized substance is prevented while acrylic acid is stored in a storage tank. A method of the present invention for producing acrylic acid, comprising storing ... | 06/03/2008 |
| 7368601 | Process for producing (meth)acrylic acids and process for distilling the same In the stopping and starting operations of a distillation column used for producing (meth)acrylic acids according to the present invention, upon stopping the operation of the distillation column, the heating of a reboiler attached thereto is interrupted and then the... | 05/06/2008 |
| 7368602 | Process for producing (meth) acrylic acid There is provided a process for producing (meth)acrylic acid including an absorption step of bringing a (meth)acrylic acid-containing gas obtained by a gas phase catalytic oxidation method into an absorption tower and allowing the gas to contact with an absorbent, i... | 05/06/2008 |
| 7351396 | Extraction process for removal of impurities from an aqueous mixture A method for removing impurities from an aqueous mixture or purified aqueous by extracting the aqueous mixture or purified aqueous mixture with an extraction solvent in an extraction zone to form an extract stream and the raffinate stream; and optionally separating ... | 04/01/2008 |
| 7351310 | Rectificative separation of fluids comprising (meth) acrylic monomers A process for rectificatively separating fluids including (meth)acrylic monomers in a rectification column by directly cooling the vapor including (meth)acrylic monomers rising to the top of the rectification column to form top condensate including (meth)acrylic mon... | 04/01/2008 |
| 7342130 | Method for producing acrylic acid A method for producing acrylic acid, comprising (a) a absorption step of absorbing acrylic acid-containing gas obtained by oxidizing raw material gas in gas phase as crude acrylic acid-containing solution, (b1) a step of separating high boiling point componen... | 03/11/2008 |
| 7332626 | Method for production of (meth) acrylic acid A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of circulating part of a discharged gas from an absorption step of acrylic... | 02/19/2008 |
| 7332624 | Method for production of acrylic acid A method for the production of acrylic acid comprises (i) a step for introducing a polymerization inhibitor to a stage other than a stage for supplying a raw material and a stage for supplying a reflux of said distilling column or (ii) a step for supplying the acryl... | 02/19/2008 |
| 7326811 | Method for production of (meth)acrylic acid by use of a shell-and-tube heat exchanger A shell-and-tube type heat exchanger of the smallest possible length necessary for heat exchange is disclosed which is capable of obtaining uniform distribution of flow of a shell side fluid and substantially eliminating the structural restriction imposed on the she... | 02/05/2008 |
| 7326323 | High capacity purification of thermally unstable compounds Separations processes and apparati capable of purifying thermally sensitive materials at high capacity. An apparatus having a rectification section and a stripping section with the stripping section having a stripping tray with 5 to 50% open area, a pressure drop fr... | 02/05/2008 |
| 7321058 | Method for producing acrolein and/or acrylic acid Acrolein and/or acrylic acid are prepared from propane and/or propene by a process comprising the following steps: (a) separation of propane and/or propene from a propane- and/or propene-containing gas mixture by absorption in an absorbent, (b) separation of the pro... | 01/22/2008 |
| 7321060 | Method for production of acrylic acid A method for the production of acrylic acid of high concentration by absorbing acrylic acid with high absorption ratio of acrylic acid is provided. In a method for producing acrylic acid by a procedure comprising a step of catalytic gas phase oxidation reaction and ... | 01/22/2008 |
| 7319169 | Method for producing (meth) acrylic acid The present invention relates to a method for producing (meth)acrylic acid comprising a process of recovering (meth)acrylic acid as an aqueous (meth)acrylic acid from a (meth) acrylic acid-containing gas mixture produced by the catalytic gas phase oxidation of at le... | 01/15/2008 |
