| Patent application number | Description | Published |
|---|
| 20080234446 | PROCESS FOR TRANSPORTING IN THE TANK OF A TANK TRUCK OR TANKER SHIP A LIQUID MONOMER PHASE WITHDRAWN FROM A STORAGE VESSEL - A process for transporting a liquid monomer phase which has been withdrawn from a storage vessel and comprises methacrylic monomers to an extent of ≧90% by weight, in a tank truck or in a tanker ship, in which the liquid monomer phase is subjected to a separating operation on the route from the storage vessel into the tank of a tank truck or of a tanker ship in order to separate polymer of the monomer present in dissolved form in the liquid monomer phase. | 09-25-2008 |
| 20080319224 | METHOD FOR THE HETEROGENEOUSLY CATALYZED PARTIAL DIRECT OXIDATION OF N-PROPANE TO ACRYLIC ACID - A method for the heterogeneously catalyzed partial direct oxidation of propane to acrylic acid in the gas phase, in which the reaction gas inlet mixture comprises cyclopropane as an impurity and the acrylic acid, after it has been converted from the product gas mixture into the liquid phase, is operated from the other constituents of the liquid phase with the aid of a separation by crystallization. | 12-25-2008 |
| 20090018347 | PROCESS FOR PURIFYING REMOVAL OF ACRYLIC ACID, METHACRYLIC ACID, N-VINYLPYRROLIDONE OR P-XYLENE CRYSTALS FROM THEIR SUSPENSION IN MOTHER LIQUOR - A process for purifying removal of acrylic acid, methacrylic acid, N-vinylpyrrolidone or p-xylene crystals from their suspension in mother liquor by means of a wash column with forced transport, whose shell of the process chamber is a metal wall, the wash column additionally being enveloped by a thermal insulation material having a water vapor barrier and a specific heat flow of >0.1 W/m | 01-15-2009 |
| 20090076232 | 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 indirect heat exchanger to which liquid phase P flows continuously with simultaneous continuous flow through the primary chamber of the indirect heat exchanger with a coolant, and continuous withdrawal of a crystal suspension S having a degree of crystallization Y from the secondary chamber in two operating states I and II, wherein the coolant temperature is lower, the mass flow of liquid phase P is greater and the molar proportion of the constituents other than the target product X in the liquid phase P in operating state II is greater than in operating state I. | 03-19-2009 |
| 20090076286 | PROCESS FOR OPERATING A CONTINUOUS REMOVAL OF A TARGET PRODUCT X IN THE FORM OF FINE CRYSTALS - A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in an indirect heat transferee, in which the crystal suspension formed is conducted out of the heat transferer first into a mixed buffer tank and, from there, fed to an apparatus for separating the crystal suspension into crystals and liquid phase, and wherein external measures dissipade the oversaturation of the crystal suspension fed to the buffer vessel with target product X. | 03-19-2009 |
| 20090250409 | PURIFICATION OF IONIC LIQUIDS - The invention relates to a process for purifying an ionic liquid, which comprises the steps (a) partial crystallization of the ionic liquid from its melt and (b) separation of the crystals from the residual melt. | 10-08-2009 |
| 20100022734 | PROCESS FOR SEPARATING ACRYLIC ACID PRESENT AS A MAIN CONSTITUENT AND GLYOXAL PRESENT AS A BY-PRODUCT IN A PRODUCT GAS MIXTURE OF A PARTIAL HETEROGENEOUSLY CATALYZED GAS PHASE OXIDATION OF A C3 PRECURSOR COMPOUND OF ACRYLIC ACID - A process for separating acrylic acid present as a main product and glyoxal present as a by-product in a product gas mixture of a partial gas phase oxidation of a C | 01-28-2010 |
| 20100206821 | PROCESS FOR PURIFYING REMOVAL OF A CHEMICAL TARGET COMPOUND FROM A SUSPENSION OF CRYSTALS THEREOF IN MOTHER LIQUOR - A process for purifying removal of a chemical target compound from a suspension of crystals thereof in mother liquor in a wash column with forced transport of the crystal bed from the top downward, in which crystals are removed from the lower end of the crystal bed with a rotating removal device and melted, and a portion of the crystal melt is conducted back toward the crystal bed as wash melt, the removal device being secured with a drive shaft conducted into the wash column from the bottom through an inlet having a seal, said drive shaft being driven about its longitudinal axis by a drive unit for rotation and being mounted so as to be rotatable about its longitudinal axis in more than one bearing, such that the mounting in one of the bearings absorbs the downward force acting on the drive shaft, the mounting in two or more bearings absorbs forces acting radially outward from the drive shaft, and the mounting in one bearing is additionally capable of absorbing an upward force acting on the drive shaft. | 08-19-2010 |
| 20110021789 | PROCESS FOR SEPARATING OFF FUMARIC ACID AND OTHER MINOR COMPONENTS DURING THE PRODUCTION OF MALEIC ANHYDRIDE - A process for decreasing fumaric acid deposits in the preparation of maleic anhydride by heterogeneously catalyzed oxidation of a hydrocarbon with molecular oxygen, in which the maleic anhydride is absorbed from the crude product mixture in an absorbent in an absorption column and desorbed again in a desorption column, the entirety or a portion of the absorbent depleted in maleic anhydride, for controlled precipitation of fumaric acid, being cooled and/or concentrated by evaporating a portion of the absorbent to such an extent that the difference between the concentration of fumaric acid in the recycle stream at the outlet of the desorption column under the conditions existing there and the equilibrium concentration of fumaric acid according to the solubility curve after the cooling and/or evaporation of a portion of the absorbent is greater than or equal to 250 ppm by weight, and the fumaric acid precipitated as a solid is removed completely or partly from the absorbent recycling system and the fumaric acid-depleted absorbent is recycled completely or partly to the absorption column. | 01-27-2011 |
