| Patent Number |
Title Of Patent |
Date Issued |
| 7566804 |
Process for preparing acrylic acid |
July 28, 2009 |
| A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C.sub.3 precursor of acrylic acid is fractionally condensed in a condensation column provided with internals ascending into itself with |
| 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 |
| 7537201 |
Thermal separating process |
May 26, 2009 |
| A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support. |
| 7520964 |
Method for the rectifying separation of fluids containing (meth)acryl monomers |
April 21, 2009 |
| A process for rectificatively separating at least one (meth)acrylic monomer-containing fluid by feeding the fluid into a rectification column containing at least one sieve tray without a runoff segment, wherein an elementary cell is obtained from a number of centers of passages in a |
| 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. |
| 7347413 |
Tray column and method for mass transfer in a tray column |
March 25, 2008 |
| A tray column is proposed which includes column trays, two or more supports which are arranged on the underside of the column trays and support them and a bearing ring for the column trays on the inner wall of the tray column, wherein three-way joints of inner column wall, bearing |
| 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 |
| 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 |
| 7226567 |
Multi-tube fixed-bed reactor, especially for catalytic gas phase reactions |
June 5, 2007 |
| A multitube fixed bed reactor and the use of such a reactor for carrying out catalytic gas-phase reactions, in particular for carrying out exothermic and endothermic catalytic gas-phase reactions such as the preparation of phthalic anhydride (PA), acrylic acid, methacrylic acid (MAA) |
| 7196217 |
Operation of a continuous heterogeneously catalyzed gas phase partial oxidation of at least one |
March 27, 2007 |
| Process for operating a continuous heterogeneously catalyzed gas phase partial oxidation of at least one organic compound using compressed air as the oxygen source which is filtered before its compression. |
| 7155801 |
Method for releasably connecting a column plate to a supporting ring in a column via a clamp |
January 2, 2007 |
| A method for using a clamp for detachable connection of a column tray to a support ring in a column including using a clamp which includes a bolt lower clamp part connected to the bolt. The lower clamp part has at least one orifice through which a liquid present in the column can flow aw |
| 7150809 |
Thermal separating process |
December 19, 2006 |
| (Meth)acrylic monomers are separated by a thermal separation process by ascending at least one ascending gaseous stream in a separating column containing a sequence of mass transfer trays and a liquid stream that contains dissolved polymerization inhibitor which descends in the separ |
| 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. |
| 7118654 |
Riser base |
October 10, 2006 |
| A chimney tray for a column for thermal treatment of a liquid. The chimney tray includes a total take-off of liquid by a drain connection arranged at an edge of the chimney tray, and having one or more drain channels having a gradient in a direction of the drain connection, and having a |
| 7118098 |
Hydraulically sealed crossflow mass transfer tray |
October 10, 2006 |
| A hydraulically sealed crossflow mass transfer tray, separating columns which contain the hydraulically sealed crossflow mass transfer tray and the use of such separating columns for thermal separating processes. |
| 7115776 |
Heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound |
October 3, 2006 |
| A process for the heterogeneously catalyzed gas-phase partial oxidation of an organic compound over a fixed catalyst bed present in a fixed-bed reactor having a plurality of catalyst tubes, in which the reduction of the quality of the catalyst load with increasing duration of operation i |
| 7109328 |
Method for producing acrylic acid |
September 19, 2006 |
| A process for the fractional condensation of a hot gas mixture which as well as acrylic acid contains at least one further condensable component in a column in the presence of at least one stabilizer comprises metering in at least a portion of the at least one stabilizer as a melt. |
| 7074955 |
Safe operation of a continuous heterogeneously catalyzed gas-phase partial oxidation of at least |
July 11, 2006 |
| A continuously operated heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound in an oxidation reactor is operated safely by a process in which an explosion diagram for the feed gas mixture is deposited as the basis of a cut-out mechanism in a computer |
| 6998504 |
Method for the catalytic gas phase oxidation of propene into acrylic acid |
February 14, 2006 |
| A process for the catalytic gas-phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized, with a high propene loading, in a first reaction stage, over a first fixed-bed catalyst which is housed in two successive reaction zones A, B, the react |
| 6958414 |
Preparation of at least one organic compound by heterogeneously catalyzed partial gas-phase oxid |
October 25, 2005 |
| Organic compounds are prepared by heterogeneously catalyzed partial gas-phase oxidation of precursor compounds by a process in which a portion of the reaction gas starting mixture is brought from a low initial pressure to a higher final pressure by means of a radial compressor. |
| 6939991 |
Preparation of acrylic acid |
September 6, 2005 |
| In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a C.sub.3 precursor of acrylic acid, after direct cooling with a quench liquid, is fractionally condensed in a separating column provided with inte |
| 6864391 |
Method for producing propylene hydroformylation products and acrylic acid and/or acrolein |
March 8, 2005 |
| A process for preparing hydroformylation products of propylene and for preparing acrylic acid and/or acrolein comprises a) feeding a propylene-containing feed in which from 2 to 40% by weight of propane is present and also carbon monoxide and hydrogen into a reaction zone and reactin |
| 6806385 |
Rectification of (meth)acrylic acid with the addition of a tenside |
October 19, 2004 |
| In a process for rectificative isolation of (meth)acrylic acid from a mixture containing, as main components, (meth)acrylic acid and an organic liquid having a higher boiling point than (meth)acrylic acid, the rectification is carried out with the addition of a surfactant. |
| 6657088 |
Temperature measurements in tubular reactors during treatment of fluid masses |
December 2, 2003 |
| A method for measuring the temperature of fluid masses being treated in a tubular reactor apparatus which comprises carrying out the treatment in reactor apparatus comprises at least two same-type tubular reactors which are filled with solid particles, at least one tubular reactor contai |
| 6525217 |
Method for the catalytic gas-phase oxidation of propene to acrylic acid |
February 25, 2003 |
| A process for the catalytic gas-phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized, with an increased propene loading, in a first reaction stage, over a first fixed-bed catalyst and then the acrolein-containing product gas mixture of the fi |
| 6403829 |
Method for the catalytic gas phase oxidation of acrolein into acrylic acid |
June 11, 2002 |
| In a process for the catalytic gas-phase oxidation of acrolein to acrylic acid, the reaction gas starting mixture is passed, with an acrolein loading of .gtoreq.150 l (s.t.p.)/l.h, over a fixed-bed catalyst which is housed in two spatially successive reaction zones A, B, the reaction zon |
| 6395936 |
Method for the catalytic gas phase oxidation of propene into acrolein |
May 28, 2002 |
| In a process for the catalytic gas-phase oxidation of propene to acrolein, the reaction gas starting mixture is passed with a propene loading of .gtoreq.160 l(S.T.P.)/l.multidot.h over a fixed-bed catalyst which is housed in two spatially successive reaction zones A,B, the reaction zone |
| 6395140 |
Method for producing (meth)acrylic acid |
May 28, 2002 |
| In a process for the preparation of (meth)acrylic acid from a mixture which contains (meth)acrylic acid and a solvent having a boiling point above the boiling point of (meth)acrylic acid by distillation of the mixture in a column which is connected to an evaporator and has a stripping se |
| 6383976 |
Multimetal oxide material for gas-phase catalytic oxidation of organic compounds |
May 7, 2002 |
| The multimetal oxide materials essentially consisting ofwhere:X.sup.1 is Co and/or Ni,X.sup.2 is Si and/or Al,X.sup.3 is an alkali metal,0.3.ltoreq.a.ltoreq.1,2.ltoreq.b.ltoreq.10,0.5.ltoreq.c.ltoreq.10,0.ltoreq.d.ltoreq.10,0.ltoreq.e.ltoreq.0.5 andy is the absolute value of the number which, assumi |
| 6348638 |
Method for removing by-products obtained when producing acrylic acid or methacrylic acids |
February 19, 2002 |
| In a process for the disposal of low, mediun, and high-boiling secondary components formed during the preparation of (meth)acrylic acid the gaseous low-boiling secondary components are burned, whilst low-boiling and medium-boiling secondary components that are dissolved in water optional |
| 6333011 |
Apparatus for measuring temperatures in tubular reactors |
December 25, 2001 |
| A reactor apparatus comprises at least two same-type tubular reactors which are filled with solid particles, at least one tubular reactor containing a temperature measuring unit, the tubular reactors being designed such that both the ratio of the mass of the solid particles to the free |
| 6228227 |
Separation of (meth)acrylic acid by rectification |
May 8, 2001 |
| In a process for the separation by rectification of (meth)acrylic acid from a mixture containing (meth)acrylic acid and an inert hydrophobic organic liquid having a boiling point higher than that of (meth)acrylic acid as main constituents and also lower aldehydes as secondary constituent |
| 6166248 |
Process for the separation of acrylic acid |
December 26, 2000 |
| A process for isolating acrylic acid forward during catalytic gas phase oxidation of propene, which entails separating acrylic acid from the gas phase oxidation reaction using an absorbent containing biphenyl, diphenyl ether or dimethyl phthalate; and extracting acrylic acid from acid wa |
| 5961790 |
Separation of (meth) acrylic acid by rectification |
October 5, 1999 |
| A process for the separation by rectification of (meth)acrylic acid from a mixture containing (meth)acrylic acid and an inert hydrophobic organic liquid having a boiling point higher than that of (meth)acrylic acid as main constituents and also lower aldehydes as secondary constituents, |
| 5855743 |
Process of isolation of (Meth) acrylic acid |
January 5, 1999 |
| A process is provided for the isolation of (meth)acrylic acid from a mixture containing (meth)acrylic acid as the main component and lower aldehydes as secondary components by rectification in a rectification column having a stripping section and a rectification section, wherein the |
| 5821390 |
Catalytic gas-phase oxidation of propene to acrolein |
October 13, 1998 |
| A gas-phase mixture of propene and oxygen is catalytically oxidized by passing a reactant gas mixture comprising propene and oxygen through a plurality of catalyst containing contact tubes in a fixed bed reactor and simultaneously passing only one heat-exchange medium at elevated tem |
| 5739391 |
Catalytic gas-phase oxidation of acrolein to acrylic acid |
April 14, 1998 |
| A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a multiple contact tube fixed-bed reactor through whose space surrounding the contact tubes only one heat-exchange medium circuit is passed, at elevated temperature on catalytically active multimetal oxides |
| 5728272 |
Separation by rectification of unsaturated carboxylic acids from solvents |
March 17, 1998 |
| In a process for the separation by rectification of unsaturated carboxylic acids from solvents in which the acids were absorbed after the synthesis reaction, the rectification is briefly interrupted and the rectification column is flushed with a basic solution. The interruption is carrie |
| 5637546 |
Preparation of catalytically active poly-metal oxide materials which contain the elements V and |
June 10, 1997 |
| In a process for the preparation of catalytically active poly-metal oxide materials containing Mo and V, a catalyst intermediate is calcined at from 300.degree. to 450.degree. C. in a gas atmosphere which, in addition to inert gases and/or steam, consists of from 0.5 to 4% by volume of O |
| 5637222 |
Process for the fractional separation of (meth)acrylic acid from a mixture containing (meth)acry |
June 10, 1997 |
| A process for the fractional separation of (meth)acrylic acid from a mixture containing (meth)acrylic acid, in which (meth)acrylic acid is tapped off from the rectifying column at a point above the level at which the liquid mixture containing (meth)acrylic acid enters the rectifying |
| 5512525 |
Regeneration of spent multimetal oxide oxidation catalysts from the catalytic gas-phase oxidatio |
April 30, 1996 |
| A process for regenerating spent multimetal oxide oxidation catalysts from the catalytic gas-phase oxidation of lower organic compounds and which, in fresh form, contain as basic constituents the elements Mo, W, V and Cu in oxidic form, by the action of oxidizing agents or means and solu |
| 5231226 |
Catalytic gas-phase oxidation of methacrolein to methacrylic acid |
July 27, 1993 |
| A process for the catalytic gas-phase oxidation of methacrolein to methacrylic acid in a fixed-bed reactor with contacting tubes, at elevated temperature on catalytically active oxides with a conversion of methacrolein for a single pass of from 40 to 95 mol%, wherein the reaction tem |
