| Patent Number |
Title Of Patent |
Date Issued |
| 7601866 |
Process for removing methacrolein from liquid phase comprising acrylic acid as a main constituen |
October 13, 2009 |
| 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 formed and the methacrole |
| 7592483 |
Preparation of acrolein or acrylic acid or a mixture thereof by heterogeneously catalyzed partia |
September 22, 2009 |
| A process for preparing acrolein or acrylic acid or a mixture thereof by heterogeneously catalyzed partial gas oxidation of propylene, in which the starting reaction gas mixture has the following contents: from 6 to 9% by volume of propylene, from 8 to 18% by volume of molecular oxygen, |
| 7589236 |
Process for separating acrylic acid and benzoic acid present in a product gas mixture of a parti |
September 15, 2009 |
| 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 benzoic acid and acrylic |
| 7589046 |
Thermal treatment of the precursor material of a catalytically active material |
September 15, 2009 |
| In a process for the thermal treatment of the precursor material of a catalytically active material in a rotary tube furnace through which a gas stream flows, at least a proportion of the gas stream flowing through the rotary tube furnace is circulated, and the associated rotary tube |
| 7560590 |
Rectificative separation of an acrylic acid-containing liquid |
July 14, 2009 |
| 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 diacrylic acid. |
| 7540884 |
Method for performing the purifying separation of crystals out their suspension in a mother liqu |
June 2, 2009 |
| A process for purifying removal of crystals from their suspension in mother liquor by means of a washing column having forced transport in which the process chamber is encased by a metal wall which, on its side facing away from the process chamber, is heated at least along the length |
| 7524792 |
Preparation of catalytically active multielement oxide materials which contain at least one of t |
April 28, 2009 |
| Catalytically active multielement oxide materials which contain at least one of the elements Nb and W and the elements Mo, V and Cu are prepared by a process in which an intimate dry blend containing ammonium ions is prepared and said dry blend is subjected to a thermal treatment in an |
| 7518016 |
Long-term operation of a heterogeneously catalyzed gas phase partial oxidation of at least one o |
April 14, 2009 |
| A process for the long-term operation of a heterogeneously catalyzed gas phase partial oxidation of at least one organic compound over a catalyst bed, in which, in order to counteract the deactivation of the catalyst bed, the working pressure in the gas phase is increased during the |
| 7518015 |
Process for heterogeneously catalyzed gas phase partial oxidation of at least one organic starti |
April 14, 2009 |
| A process for heterogeneously catalyzed gas phase partial oxidation of an organic starting compound over a fixed catalyst bed freshly installed into a reaction chamber, in which the reduction in the quality of the fixed catalyst bed is restored with increasing operating time by repla |
| 7439389 |
Process for preparing at least one organic target compound by heterogeneously catalyzed gas phas |
October 21, 2008 |
| A process for preparing an organic target compound by heterogeneously catalyzed gas phase partial oxidation of an organic precursor compound with molecular oxygen in two oxidation reactor lines operated in parallel and removal of the target compound from the mixture of the product gas |
| 7393436 |
Thermal separating process for removing at least one stream containing enriched (meth) acrylic m |
July 1, 2008 |
| 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 minimized. |
| 7388106 |
Process for preparing acrolein or acrylic acid or a mixture thereof from propane |
June 17, 2008 |
| A process for preparing acrolein or acrylic acid or a mixture thereof from propane, in which propane is dehydrogenated under heterogeneous catalysis in a reaction zone A and the propylene formed is partially oxidized heterogeneously in a reaction zone, reaction zone A being operated in |
| 7331354 |
Cleaning of tray columns which have been used for rectificatively treating liquids comprising (m |
February 19, 2008 |
| In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid at an average gas phase |
| 7323590 |
Process for rectificatively separating a liquid comprising acrylic acid and/or methacrylic acid |
January 29, 2008 |
| A process for rectificatively separating a liquid which comprises acrylic acid, methacrylic acid or a mixture thereof, and additionally comprises low molecular weight aldehydes and acetone. |
| 7307189 |
Method for discontinuous purification of crude acrylic acid by means of crystallization |
December 11, 2007 |
| Crude acrylic acid is purified batchwise by crystallization by a process which comprises at least one purification stage and at least one stripping stage and in which at least the first stripping stage is carried out in a different crystallizer from the first purification stage. |
| 7307132 |
Method for producing low-odor hydrogel-forming polymers |
December 11, 2007 |
| This invention relates to a process for preparing a low-odor hydrogel-forming acrylic acid polymer, which comprises the steps of: a) preparing a polymeric hydrogel by free-radically polymerizing a monomer composition comprising at least 50% by weight of acrylic acid in an aqueous pol |
| 7211692 |
Long-term operation of a heterogeneously catalyzed gas phase partial oxidation of propene to acr |
May 1, 2007 |
| A process for the long-term operation of a two-stage heterogeneously catalyzed gas phase partial oxidation of propene to acrylic acid, in which the temperature of the fixed catalyst beds is increased over the time and the gas phase partial oxidation is interrupted from time to time a |
| 7211691 |
Heterogeneously catalyzed partial gas phase oxidation of propene to acrolein |
May 1, 2007 |
| In a process for heterogeneously catalyzed partial gas phase oxidation of propene to acrolein, the starting reaction gas mixture is oxidized over a fixed catalyst bed which consists of at least two fixed catalyst bed zones and is accommodated in two successive temperature zones A, B, and |
| 7208636 |
Preparation of acrolein by heterogeneously catalyzed partial gas phase oxidation of propene |
April 24, 2007 |
| Acrolein is prepared by a process of heterogeneous catalyzed partial gas phase oxidation, by passing a starting reaction gas mixture which comprises propene, molecular oxygen and at least one inert gas, in which the molecular oxygen to propene (O.sub.2:C.sub.3H.sub.6) mole ratio is . |
| 7176335 |
Method for producing methacrolein from isobutane |
February 13, 2007 |
| A process prepares methacrolein from isobutane by subjecting isobutane to a partial catalytic dehydrogenation in the gas phase and using the isobutenic product gas mixture to charge an oxidation zone in which the isobutene is oxidized to methacrolein in the gas phase with heterogeneous |
| 7164039 |
Heterogeneously catalyzed partial gas phase oxidation of propene to acrylic acid |
January 16, 2007 |
| In a process for heterogeneously catalyzed partial gas phase oxidation of propene to acrylic acid, the propene-containing starting reaction gas mixture is oxidized in a first reaction stage using a fixed catalyst bed 1 which consists of a plurality of fixed catalyst bed zones and is |
| 7157598 |
Method for producing an aqueous alkali acrylate solution |
January 2, 2007 |
| A process prepares an aqueous alkali metal acrylate solution by distillatively removing acrylic acid from a mixture as vapors and taking up the vapors immediately from the gas phase into an aqueous alkali solution. |
| 7157597 |
Heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid |
January 2, 2007 |
| In a process for heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid, the starting reaction gas mixture is oxidized over a fixed catalyst bed 1 which consists of at least two fixed catalyst bed zones and is accommodated in two successive temperature zones A, |
| 7154009 |
Long-term operation of a heterogeneously catalyzed gas phase partial oxidation of propene to acr |
December 26, 2006 |
| A process for the long-term operation of a heterogeneously catalyzed gas phase partial oxidation of propene to acrolein, in which the temperature of the fixed catalyst bed is increased over the time and the gas phase partial oxidation is interrupted at least once per calendar year and th |
| 7038080 |
Heterogeneously catalyzed gas-phase partial oxidation of acrolein to acrylic acid |
May 2, 2006 |
| A process for the heterogeneously catalyzed gas-phase partial oxidation of acrolein to acrylic acid over a multimetal oxide material having a specific structure, which contains the elements Mo and V, at least one of the elements Te and Sb and at least one of the elements from the group |
| 7019176 |
Heterogeneously catalyzed partial gas phase oxidation of propene to acrolein |
March 28, 2006 |
| In a process for heterogeneously catalyzed partial gas phase oxidation of propene to acrolein, the starting reaction gas mixture is oxidized at a propene loading of <160 l (STP) of propene/l of fixed catalyst bedh over a fixed catalyst bed which is accommodated in two successive r |
