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20080234446 | PROCESS FOR TRANSPORTING IN THE TANK OF A TANK TRUCK OR TANKER SHIP A LIQUID MONOMER PHASE WITHDRAWN FROM A STORAGE VESSEL - A process for transporting a liquid monomer phase which has been withdrawn from a storage vessel and comprises methacrylic monomers to an extent of ≧90% by weight, in a tank truck or in a tanker ship, in which the liquid monomer phase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 |
20080300414 | PROCESS FOR RECHARGING THE REACTION TUBES OF A TUBE BUNDLE REACTOR WITH A NEW FIXED CATALYST BED - A process for recharging the reaction tubes of a tube bundle reactor with a new fixed catalyst bed, in which a heterogeneously catalyzed partial gas phase oxidation of an organic compound had been performed beforehand in a preceding fixed catalyst bed comprising Mo-comprising multielement oxide active compositions to form a steam-comprising product gas mixture, in which, before the recharge, solid deposit which had been deposited on the tube inner walls and comprises molybdenum oxide and/or molybdenum oxide hydrate is brushed away with the aid of a brush. | 12-04-2008 |
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 |
20090221780 | PROCESS FOR STORING A MONOMER PHASE WHICH IS LIQUID UNDER THE CONDITIONS OF STORAGE - A process for storing a monomer phase which is liquid under the conditions of storage and comprises methacrylic monomers to an extent of ≧95% by weight and has been obtained by condensation out of a gaseous phase or by melting a crystalline phase, in a storage vessel, in which polymer of the monomer present in dissolved form in the liquid monomer phase is removed therefrom on the route from its generation into the storage vessel, and also a process for withdrawing liquid monomer phase from the storage vessel in which polymer of the monomer present in dissolved form in the monomer phase is likewise removed. | 09-03-2009 |
20090270652 | PROCESS FOR TRANSFERRING HEAT TO A LIQUID COMPRISING DISSOLVED MONOMERIC ACRYLIC ACID, MICHAEL ACRYLIC ACID OLIGOMERS AND ACRYLIC ACID POLYMER - A process for transferring heat to a liquid F comprising dissolved monomeric acrylic acid, Michael acrylic acid oligomers, and acrylic acid polymer with the aid of an indirect heat exchanger to which are supplied the liquid F with a temperature T | 10-29-2009 |
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 |
20100152482 | PROCESS FOR REDISSOCIATING MICHAEL ADDUCTS WHICH ARE PRESENT IN A LIQUID F AND HAVE BEEN FORMED IN THE PREPARATION OF ACRYLIC ACID OR ESTERS THEREOF - A process for redissociating Michael adducts which are present in a liquid F with a proportion by weight of ≧10% by weight and have been formed in the preparation of acrylic acid or esters thereof in a redissociating apparatus which comprises a pump P, a separating column K with separating internals and a circulation heat exchanger UW, wherein, for the purpose of supplying the cleavage energy, the pump P sucks in bottoms liquid from the bottom space of the separating column K and, via the circulation heat exchanger UW, continually recycles it into the bottom space above the level of the bottoms liquid, and wherein the pump P is a radial circulation pump with an open impeller. | 06-17-2010 |
20100197489 | METHOD OF CHARGING CATALYST TUBES OF A BUNDLE OF CATALYST TUBES IN A STRUCTURED FASHION - A method of charging catalyst tubes of a bundle of catalyst tubes in a structured fashion, in which uniformly predispensed portions of formulations of shaped catalyst bodies are used for producing a section of charge. | 08-05-2010 |
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 |
20110036704 | PROCESS FOR REMOVAL OF ACRYLIC ACID FROM THE PRODUCT GAS MIXTURE OF A HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF AT LEAST ONE C3 PRECURSOR COMPOUND - A process for removal of a crude acrylic acid from a product gas mixture which comprises glyoxal as a by-product from a heterogeneously catalyzed partial gas phase oxidation of at least one C | 02-17-2011 |
20110140050 | PROCESS FOR INHIBITING POLYMERIZATION OF (METH)ACRYLIC ACID AND/OR (METH)ACRYLIC ESTERS - A process for inhibiting polymerization of (meth)acrylic acid and/or (meth)acrylic esters by introducing an oxygenous gas into the (meth)acrylic acid and/or the (meth)acrylic ester, in which the (meth)acrylic acid and/or the (meth)acrylic ester has a degree of purity of at least 95% and is in the liquid state. | 06-16-2011 |
20120085969 | PROCESS FOR INHIBITING UNWANTED FREE-RADICAL POLYMERIZATION OF ACRYLIC ACID PRESENT IN A LIQUID PHASE P - A process for inhibiting unwanted free-radical polymerization of acrylic acid present in a liquid phase P whose acrylic acid content is at least 10% by weight and which, based on the weight of the acrylic acid present therein, additionally comprises at least 100 ppm by weight of propionic acid and at least 100 ppm by weight of glyoxal, in which at least one chemical compound of the element copper is added to the liquid phase P, and the resulting liquid phases P to which a chemical compound of the element copper has been added. | 04-12-2012 |
20120258019 | APPARATUS FOR A PROCESS FOR REDISSOCIATING MICHAEL ADDUCTS WHICH ARE PRESENT IN A LIQUID F AND HAVE BEEN FORMED IN THE PREPARATION OF ACRYLIC ACID OR ESTERS THEREOF - A redissociating apparatus to carry out a process for redissociating Michael adducts which are present in a liquid F with a proportion by weight of ≧10% by weight and have been formed in the preparation of acrylic acid or esters thereof is provided. The apparatus comprises a pump P, a separating column K with separating internals and a circulation heat exchanger UW, wherein, for the purpose of supplying the cleavage energy, the pump P sucks in bottoms liquid from the bottom space of the separating column K and, via the circulation heat exchanger UW, continually recycles it into the bottom space above the level of the bottoms liquid, and wherein the pump P is a radial circulation pump with an open impeller. | 10-11-2012 |
20140135523 | CONTINUOUS PROCESS FOR PREPARING (METH)ACRYLATES OF C10-ALCOHOL MIXTURES - A continuous process for preparing (meth)acrylates of C | 05-15-2014 |