Patent application number | Description | Published |
20110034707 | METHOD FOR STARTING A GAS-PHASE OXIDATION REACTOR - What is described is a process for starting up a gas phase oxidation reactor for oxidation of o-xylene to phthalic anhydride, said reactor comprising at least one catalyst layer and being temperature-controllable by means of a heat carrier medium, wherein a) the catalyst layer is interrupted by a moderator layer which is less catalytically active than the catalyst layer or is catalytically inactive, b) a gas stream is passed through the reactor with an initial loading of o-xylene and at an initial temperature of the heat transfer medium, c) the loading of the gas stream is increased to a target loading and, in parallel, the temperature of the heat transfer medium is lowered to an operating temperature. The introduction of the moderator layer allows the loading to be increased more rapidly and the startup time to be shortened. | 02-10-2011 |
20110124885 | MULTILAYER CATALYST HAVING VANADIUM ANTIMONATE IN AT LEAST ONE CATALYST LAYER FOR PREPARING CARBOXYLIC ACIDS AND/OR CARBOXYLIC ANHYDRIDES AND PROCESS FOR PREPARING PHTHALIC ANHYDRIDE HAVING A LOW HOT SPOT TEMPERATURE - The present invention relates to a catalyst system for preparing carboxylic acids and/or carboxylic anhydrides, which system comprises a plurality of superposed catalyst layers arranged in a reaction tube, where vanadium antimonate is introduced into the active material in at least one of the catalyst layers. The present invention further relates to a process for gas-phase oxidation, in which a gaseous stream comprising at least one hydrocarbon and molecular oxygen is passed through a plurality of catalyst layers and the maximum hot spot temperature is below 425° C. | 05-26-2011 |
20110230668 | CATALYST FOR GAS PHASE OXIDATIONS BASED ON LOW-SULFUR AND LOW-CALCIUM TITANIUM DIOXIDE - A catalyst for gas phase oxidations comprises an inert support and a catalytically active material which comprises vanadium oxide and titanium dioxide and has been applied thereto. The titanium dioxide has a content of sulfur compounds, calculated as S, of less than 1000 ppm and a content of calcium compounds, calculated as Ca, of less than 150 ppm. The catalyst has a relatively high activity and/or selectivity and thus enables relatively high yields of the desired target product, for example phthalic anhydride. Also described is a process for preparing phthalic anhydride, wherein a gas stream which comprises molecular oxygen and o-xylene, naphthalene or mixtures thereof is contacted with the catalyst. | 09-22-2011 |
20110251405 | PROCESS FOR CONTROLLING A GAS PHASE OXIDATION REACTOR FOR PREPARATION OF PHTHALIC ANHYDRIDE - In a process for controlling a gas phase oxidation reactor for preparation of phthalic anhydride, by passing a gas stream which comprises an aromatic hydrocarbon and molecular oxygen through a multitude of reaction tubes arranged in the gas phase oxidation reactor, each of which comprises a bed of at least one catalyst and the temperature of which can be controlled by means of a heat transfer medium, at least one control parameter is measured and correcting interventions for control of the control parameter are determined, the at least one control parameter comprising the phthalic anhydride yield and the correcting parameter used being the temperature of the heat carrier medium. Over at least 90% of the lifetime of the catalyst, the change in the correcting parameter is limited to a maximum of 0.5 K within a period of 30 days. In this way, the cumulated phthalic anhydride yield over the lifetime of the catalyst is maximized. | 10-13-2011 |
20110257413 | CATALYST AND METHOD FOR PRODUCING MALEIC ANHYDRIDE - The invention relates to a catalyst molded body for preparing maleic anhydride by gas-phase oxidation of a hydrocarbon having at least four carbon atoms using a catalytically active composition contains vanadium, phosphorus and oxygen, where the shaped catalyst body has an essentially cylindrical body having a longitudinal axis, wherein the cylindrical body has at least two parallel internal holes which are essentially parallel to the cylinder axis of the body and go right through the body. The catalyst molded body has a large outer surface area, a lower pressure loss and sufficient mechanical stability. | 10-20-2011 |
20110257414 | CATALYST MOLDED BODIES AND METHOD FOR PRODUCING MALEIC ACID ANHYDRIDE - The catalytically active mass of a catalyst molded body comprises a multi-element oxide containing vanadium and phosphorus. The specific pore volume PV (in ml/g) of the catalyst molded body, the bulk density p of the catalyst molded body (in kg/l), the geometric surface area A | 10-20-2011 |
20110275856 | EGGSHELL CATALYST CONSISTING OF A HOLLOW CYLINDRICAL SUPPORT BODY AND A CATALYTICALLY ACTIVE OXIDE MATERIAL APPLIED TO THE OUTER SURFACE OF THE SUPPORT BODY - An eggshell catalyst consisting of a hollow cylindrical support body of length 2 to 10 mm, external diameter 4 to 10 mm and wall thickness 1 to 4 mm, and an eggshell, applied to the outer surface of the support body, of catalytically active oxide material of the general formula I, | 11-10-2011 |
20120071671 | CATALYST AND METHOD FOR PARTIALLY OXIDIZING HYDROCARBONS - The invention relates to a catalyst for partially oxidizing hydrocarbons in the gas phase, containing a multi-metal oxide of the general formula (I), AgaMObVcMdOe.f H2O (I), wherein M stands for at least one element selected from among Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, B, Al, Ga, In, Si, Sn, Pb, P, Sb, Bi, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Au, Zn, Cd, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and U, a has a value of 0.5 to 1.5, b has a value of 0.5 to 1.5, c has a value of 0.5 to 1.5, a+b+c has the value 3, d has a value of less than 1, e means a number that is determined by the valence and frequency of the elements other than oxygen in the formula (I), f has a value of 0 to 20, which multi-metal oxide exists in a crystal structure, the X-ray powder diffractogram of which is characterized by diffraction reflections at a minimum of 5 lattice distances selected from among d=4.53, 3.38, 3.32, 3.23, 2.88, 2.57, 2.39, 2.26, 1.83, 1.77 AA (+−0.04 AA). | 03-22-2012 |
20120149919 | MALEIC ANHYDRIDE SYNTHESIS CATALYST PRECURSOR AND PROCESS FOR ITS PREPARATION - A process for preparing a vanadium, phosphorus, and oxygen comprising catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, which comprises
| 06-14-2012 |
20120264951 | PROCESS FOR PRODUCING A CATALYST FOR THE OXIDATION OF ETHYLENE TO ETHYLENE OXIDE - The invention relates to a process for producing a catalyst for the oxidation of ethylene to ethylene oxide, which comprises a) providing a support which comprises alumina and has been impregnated with silver or with a silver-comprising compound and has a temperature T | 10-18-2012 |
20120264952 | CATALYST FOR PREPARING ETHYLENE OXIDE - Catalyst for preparing ethylene oxide, at least comprising silver applied to a support, the support having a BET constant C in the range from 0 to 800, determined in accordance with DIN ISO 9277. | 10-18-2012 |
20120264953 | ZINC-COMPRISING CATALYST FOR PREPARING ETHYLENE OXIDE - Process for preparing a catalyst for preparing ethylene oxide, which comprises silver and zinc applied to a support, where the process comprises at least
| 10-18-2012 |
20120264954 | PROCESS FOR PRODUCING A CATALYST FOR THE OXIDATION OF ETHYLENE TO ETHYLENE OXIDE - The present invention relates to a shaped catalyst body for preparing ethylene oxide, which comprises at least silver and rhenium applied to an alumina support, and also to a process for producing it, wherein the alumina support has the geometry of a hollow cylinder and the shaped catalyst body has a rhenium content C | 10-18-2012 |
20130023699 | MO-, BI- AND FE-COMPRISING MULTIMETAL OXIDE COMPOSITIONS - Mo-, Bi- and Fe-comprising multimetal oxide compositions of the general stoichiometry I, | 01-24-2013 |
20130109871 | PROCESS FOR PRODUCING A SUPPORTED SILVER CATALYST | 05-02-2013 |
20130123517 | SILVER VANADIUM PHOSPHATES - The invention relates to novel silver vanadium phosphates, catalysts based on these silver vanadium phosphates and the use of these catalysts for carrying out organic reactions in the gas phase. | 05-16-2013 |
20130217896 | GAS PHASE OXIDATION CATALYST WITH LOW CHARGE TRANSPORT ACTIVATION ENERGY - A catalyst for the gas phase oxidation of organic hydrocarbons comprises a multielement oxide which comprises at least one transition meal such as vanadium, wherein the catalyst has a charge transport activation energy E | 08-22-2013 |
20140163289 | Coated Catalyst for the Oxidative Dehydrogenation of N-Butenes to Butadiene - The invention relates to a coated catalyst which comprises
| 06-12-2014 |
20140213801 | MULTILAYER CATALYST HAVING VANADIUM ANTIMONATE IN AT LEAST ONE CATALYST LAYER FOR PREPARING CARBOXYLIC ACIDS AND/OR CARBOXYLIC ANHYDRIDES AND PROCESS FOR PREPARING PHTHALIC ANHYDRIDE HAVING A LOW HOT SPOT TEMPERATURE - The present invention relates to a catalyst system for preparing carboxylic acids and/or carboxylic anhydrides, which system comprises a plurality of superposed catalyst layers arranged in a reaction tube, where vanadium antimonate is introduced into the active material in at least one of the catalyst layers. The present invention further relates to a process for gas-phase oxidation, in which a gaseous stream comprising at least one hydrocarbon and molecular oxygen is passed through a plurality of catalyst layers and the maximum hot spot temperature is below 425° C. | 07-31-2014 |
20140221683 | PROCESS FOR PRODUCING A CATALYTICALLY ACTIVE COMPOSITION BEING A MIXTURE OF A MULTIELEMENT OXIDE COMPRISING THE ELEMENTS MO AND V AND AT LEAST ONE OXIDE OF MOLYBDENUM - A process for producing a catalytically active composition being a mixture of a multielement oxide comprising the elements Mo and V and at least one oxide of molybdenum, in which spray drying of an aqueous solution or of an aqueous suspension of starting compounds comprising the elements of the multielement oxide produces a spray powder P, a pulverulent oxide of molybdenum and optionally shaping assistants are added thereto, shaped bodies are shaped from the resulting mixture and these are converted to the catalytically active composition by thermal treatment. | 08-07-2014 |
20140343318 | PROCESS FOR PREPARING VINYLIDENECARBOXYLIC ACID (ESTER)S BY REACTION OF FORMALDEHYDE WITH ALKYLCARBOXYLIC ACID (ESTER)S - Process for preparing a vinylidenecarboxylic acid or ester thereof, wherein a reaction gas comprising gaseous formaldehyde, molecular oxygen and an alkycarboxylic acid or ester thereof is brought into contact with a solid catalyst whose active composition comprises a vanadium-phosphorus oxide having an average oxidation state of vanadium of from +4.40 to +5.0 to give a product gas comprising the vinylidenecarboxylic acid or ester thereof. | 11-20-2014 |
20150080605 | CATALYST FOR PREPARATION OF AN UNSATURATED CARBOXYLIC ACID BY GAS PHASE OXIDATION OF AN UNSATURATED ALDEHYDE - What is described is a catalyst for preparation of an α,β-unsaturated carboxylic acid by gas phase oxidation of an α,β-unsaturated aldehyde, comprising a shaped support body with an active composition applied thereto, wherein the active composition coverage q | 03-19-2015 |