[FISCHER ROLF-HARTMUTH DR, WECK ALEXANDER, STEIN FRANK DR, PINKOS ROLF DR, HESSE MICHAEL DR, SPRAGUE MICHAEL JOLYON DR, SCH MARKUS R XD DR, BORCHERT HOLGER DR, SCHLITTER STEPHAN DR, RAHN RALF-THOMAS DR] DE UNSUBSTITUTED OR ALKYL-SUBSTITUTED THF IS OBTAINED BY CATALYTIC HYDROGENATION IN THE GAS PHASE OF C4-DICARBOXYLIC ACIDS AND/OR THEIR DERIVATIVES USING A CATALYST COMPRISING ＜80BY WEIGHT, PREFERABLY ＜70BY WEIGHT, IN PARTICULARLY FROM 10 TO 65BY WEIGHT, OF CuO AND ＞20BY WEIGHT, PREFERABLY ＞30BY WEIGHT IN PARTICULARLY FROM 35 TO 90BY WEIGHT, OF AN OXIDIC SUPPORT HAVING ACID CENTERS, AT A HOT SPOT TEMPERATURE OF FROM 240 TO 310°C, PREFERABLY FROM 240 TO 280°C, AND A WHSV OVER THE CATALYST OF FROM 0.01 TO 1.0, PREFERABLY FROM0.02 TO 1, IN PARTICULARLY FROM 0.05 TO 0.5, kg OF STARTING MATERIAL/L OF CATALYST x HOUR.

[PINKOS ROLF DR, FISCHER ROLF-HARTMUTH DR, MARKUS ROESCH DR, BOTTKE NILS DR, SCHLITTER STEPHAN DR, HESSE MICHAEL DR, WECK ALEXANDER, WINDECKER GUNTHER, HEYDRICH GUNNAR DR] DE THE PRESENT INVENTION RELATES TO A PROCESS FOR PREPARING UNSUBSTITUTED OR C1-C4-ALKYL-SUBSTITUTED GAMMA-BUTYROLACTONE BY CATALYTIC HYDROGENATION OF MALEIC ACID AND/OR ITS DERIVATIVES IN THE PRESENCE OF CHROMIUM-FREE CATALYST COMPRISING FROM 10 TO 80% BY WEIGHT OF COPPER OXIDE AND FROM 10 TO 90% BY WEIGHT OF AT LEAST ONE CATALYST SUPPORT SELECTED FROM THE GROUP CONSISTING OF SILICON DIOXIDE, TITANIUM DIOXIDE, HAFNIUM DIOXIDE, MAGNESIUM SILICATE, ACTIVATED CARBON, SILICON CARBIDE, ZIRCONIUM DIOXIDE AND ALPHA-ALUMINUM OXIDE.

[DR ROLF PINKOS, DR FRANK STEIN, DR THOMAS N0XD6BEL, DR SYLVIA HUBER-DIRR, DR JOACHIM WULFF-DORING, DR ROLF-HARTMUTH FISCHER, DR STEPHAN ANDREAS SCHUNK] DE IN A PROCESS FOR PREPARING ALCOHOLS BY CATALYTIC HYDROGENATION OF CARBONYL COMPOUNDS OVER A CATALYST COMPRISING RHENIUM ON ACTIVATED CARBON, THE CATALYST USED COMPRISES RHENIUM (CALCULATED AS METAL) IN A WEIGHT RATIO TO THE ACTIVATED CARBON OF FROM 0.0001 TO 0.5, PLATINUM (CALCULATED AS METAL) IN A WEIGHT RATIO TO THE ACTIVATED CARBON OF FROM 0.0001 TO 0.5 AND, IF APPROPRIATE,AT LEAST ONE FURTHER METAL SELECTED FROM AMONG Zn, Cu, Ag, Au, Ni, Fe, Ru, Mn, Cr, Mo, W AND V IN A WEIGHT RATIO TO THE ACTIVATED CARBON OF FROM 0 TO 0.25, AND THE ACTIVATED CARBON HAS BEEN NONOXIDATIVELY PRETREATED. IT IS ALSO POSSIBLE TO PREPARE ETHERS AND LACTONES IF THE HYDROGEN PRESSURE IS NOT MORE THAN 2500 kPa (25 BAR). IN THIS CASE, THE ACTIVATED CARBON IN THE CATALYST MAY ALSO HAVE BEEN NONOXIDATIVELY PRETREATED.

[DR TOMPERS ROLF, DR URTEL HEIKO, DR PINKOS ROLF, DR TEBBEN GERD-DIETER, DR HEIMANN JENS, DR GUIXA GUARDIA MARIA, BORCHERS SABINE] DE IN A PROCESS FOR PREPARING A SUPPORTED HYDROGENATION CATALYST WITH INCREASED HYDROGENATION ACTIVITY, WHICH COMPRISES A HYDROGENATING METAL AND/OR AN OXIDE OF A HYDROGENATING METAL ON AN AL2O3- CONTAINING SUPPORT MATERIAL, SAID CALCINED SUPPORTED HYDROGENATION CATALYST IS TREATED BEFORE OR AFTER THE FINAL SHAPING THEREOF AND BEFORE USE THEREOF IN THE HYDROGENATION WITH A BASE SOLUTION HAVING A PH OF ＞ 10 AT A TEMPERATURE IN THE RANGE FROM 20 TO 120°C FOR 1 TO 300 HOURS.

[FISCHER ROLF DR, GOSCH HANS-JUERGEN DR, LERMER HELMUT DR, PINKOS ROLF DR, WEYER HANS-JUERGEN DR]

[FISCHER ROLF DR, PINKOS ROLF DR, RIEBER NORBERT DR, SCHULZ MICHAEL DR, TELES JOAQUIM HENRIQUE DR] DE

[FISCHER ROLF DR, GOSCH HANS-JUERGEN DR, LERMER HELMUT DR, PINKOS ROLF DR, WEYER HANS-JUERGEN DR]

[DOSTALEK ROMAN DR, FISCHER ROLF DR, KRUG THOMAS, PAUL AXEL DR, PINKOS ROLF DR, STEIN FRANK DR] DE The invention relates to a method for catalytically hydrogenating carboxylic acids or the anhydrides or esters thereof into alcohol on heterogeneous catalysts containing hydrogenating elements of groups 6, 7, 8, 9, 10 and 11 and optionally groups 2, 14 and 15 of the periodic table of elements or consisting thereof, in a liquid phase at temperatures of 100-300 DEG C and at pressures of 10-300 bars, whereby 1-3,000 ppm of a basic alkali or earth-alkaline compound in relation to the liquid hydrogenating feed and selected from a group consisting of hydroxides, carbonates, carboxylates and alcoholates is added to the hydrogenating reaction mixture.

[LIANG SHELUE DR, FISCHER ROLF HARTMUTH DR, PINKOS ROLF DR, STEIN FRANK DR, BREITSCHEIDEL BORIS DR] DE 1,6-Hexanediol is produced by gas-phase hydrogenation of adipate and/or 6-hydroxycaproate esters at 150-230 deg C and 10-70 bar on chromium-free catalysts essentially containing copper, manganese and aluminium or on Raney copper, with a hydrogen:ester mol ratio of (150:1) - (300:1) and a catalyst loading of 0.01-0.3 kg 6C-ester/l catalyst/hour.

[Fischer, Rolf, Dr., Pinkos, Rolf, Dr., Rieber, Norbert, Dr., Schulz, Michael, Dr., Teles, Joaquim Henrique, Dr.]