| 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 |
| 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 |
| 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 |
| 7319166 |
Method of purifying a raw melt of at least one monomer by crystallization |
January 15, 2008 |
| The invention relates to a method for purifying a raw melt of at least one monomer by crystallization, wherein suspension crystallization is initially used and the resulting remaining melt or the suspension crystals that have been molten once again and separated are subjected to a me |
| 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. |
| 7129376 |
Method for the production of a purified melt of at least one monomer |
October 31, 2006 |
| The invention relates to a method for the production of a purified melt of a monomer melt obtained by condensation, absorption or extraction in a crystallizer, wherein the inlet to the crystallizer is subjected to a mechanical solid/liquid separation operation. |
