| Patent Number |
Title Of Patent |
Date Issued |
| 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. |
| 7326802 |
Preparation of at least one partial oxidation and/or ammoxidation product of propylene |
February 5, 2008 |
| In a process for preparing at least one partial oxidation and/or ammoxidation product of propylene, the propylene is obtained from crude propane by dehydrogenating and subjected in the presence of unconverted propane as a constituent of a gas mixture 2 which comprises a total C.sub.4 |
| 7238827 |
Preparation of at least one partial oxidation and/or ammoxidation product of propylene |
July 3, 2007 |
| Process for preparing at least one partial oxidation and/or ammoxidation product of propylene, in which the propylene is produced from crude propane by dehydrogenation and is subjected to a heterogeneously catalyzed gas-phase partial oxidation and/or partial gas-phase ammoxidation in |
| 7179875 |
Method for producing water-absorbent resins |
February 20, 2007 |
| In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene and/or acrolein. This is treated with an aldehyde scavenger and pure acrylic acid is separa |
| 7157598 |
Method for producing an aqueous alkali acrylate solution |
January 2, 2007 |
| A process prepares an aqueous alkali metal acrylate solution by distillatively removing acrylic acid from a mixture as vapors and taking up the vapors immediately from the gas phase into an aqueous alkali solution. |
| 7019168 |
Heterogeneously catalyzed partial gas phase oxidation of propene to acrylic acid |
March 28, 2006 |
| In a process for partially oxidizing propene to acrylic acid in the gas phase under heterogeneous catalysis, a starting reaction gas mixture comprising propene and oxygen and having a specific composition is oxidized in a first reaction stage over a first fixed catalyst bed having a |
| 7012157 |
Preparation of (meth)acrylic acid |
March 14, 2006 |
| A process for preparing (meth)acrylic acid, in which a saturated hydrocarbon precursor compound is conducted through a catalyst charge which consists of two spatially successive catalyst beds I, II in the flow direction of the reaction mixture, each of which contains different cataly |
| 6458989 |
Method for producing (meth)acrylic acid and (meth)acrylic acid esters |
October 1, 2002 |
| A process for preparing pure (meth)acrylic acid or a (meth)acrylate starting from a crude (meth)acrylic acid, which comprises the following stages: A: treating the crude (meth)acrylic acid with at least one compound which is able to remove aldehydes, to give an aldehyde-free crude (me |
| 6207022 |
Purification of crude (meth) acrylic acid |
March 27, 2001 |
| Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation. |
| 5482597 |
Purification of crude (meth)acrylic acid |
January 9, 1996 |
| In a process for purifying crude (meth)acrylic acid, the crude (meth)acrylic acid is worked up by distillation after addition of an organic carboxylic acid hydrazide and, if desired, an organic sulfonic acid. |
| 5449821 |
Multimetal oxide compositions for gas-phase catalytic oxidation |
September 12, 1995 |
| A process for the gas phase catalytic oxidation of a C.sub.3-6 alkane, alkanol, alkene or alkenal using as a catalyst multimetal oxide compositions of the formula I, [X.sup.1.sub.a X.sup.2.sub.b O.sub.x ].sub.p [X.sup.3.sub.c X.sup.4.sub.d X.sup.5.sub.e X.sup.6.sub.f X.sup.7.sub.g X. |
| 5364825 |
Multimetal oxide compositions and process of preparing same |
November 15, 1994 |
| Multimetal oxide compositions of the formula IwhereX.sup.1 is bismuth, tellurium, antimony, tin and/or copper,X.sup.2 is molybdenum and/or tungsten,X.sup.3 is an alkali metal, thallium and/or samarium,X.sup.4 is an alkaline earth metal, nickel, cobalt, copper, manganese, zinc, tin, cadmium and/o |
| 5144091 |
Preparation of acrolein or methacrolein by actalytic gas-phase oxidation of propene or isobutene |
September 1, 1992 |
| A process for the catalytic gas-phase oxidation of propene or isobutene to acrolein or methacrolein in a tubular fixed bed reactor or catalytically active oxides with a .gtoreq.90% conversion of the initial olefin on a single passage, wherein the temperature of the gases containing the |
| 5017542 |
Catalyst for the oxidation and ammonoxidation of .alpha.-, .beta.-unsaturated hydrocarbons |
May 21, 1991 |
| Catalyst particles of an active material of the general formulawherea is from 0.1 to 5,b is from 0.1 to 10,c is from 1 to 15,d is from 0.01 to 2,e is from 0 to 2,f is from 0 to 30 andx is the number of oxygen atoms required to saturate the valences of the other components,have the shape of a 3-s |
| 4916103 |
Preparation of a catalytically active composition for the gas phase oxidation of propylene to ac |
April 10, 1990 |
| A catalytically active composition for the gas phase oxidation of propylene to acrolein and acrylic acid, of the general formulawhere A is arsenic, antimony, tin, thallium, tungsten, an alkaline earth metal, zinc and/or chromium, B is at least one of the metals sodium, potassium, rubidiu |
