Abstract: The invention provides a process for preparing aromatic amines by catalytically hydrogenating the corresponding nitro compounds, especially for preparing tolylenediamine by hydrogenating dinitrotoluene, which comprises using hydrogenation catalysts in which the active component present is a mixture of platinum, nickel and an additional metal on a support.

Abstract: A process for the preparation of benzophenonimine (BPI) of the general formula I where R1 and R2 are C1- to C4-alkoxy, C1- to C2-alkylamine and C2- to C4-dialkylamine and m and n are integers from 0 to 5 and R1 and R2, independently of one another, may be identical or different, by reacting benzophenone (BP) of the general formula II where R1, R2, m and n have the abovementioned meanings, in ammonia and in the presence of titanium dioxide, the titanium dioxide being present substantially in the anatase modification.

Abstract: A process for preparing optically active alkanols of the formula I in which n is an integer from 0 to 5; Cyc is an optionally substituted, mono- or polynuclear, saturated or unsaturated, carbocyclic or heterocyclic ring, and R1 is halogen, SH, OH, NO2, NR2R3 or NR2R3R4+X?, with R2, R3 and R4 independently of one another being hydrogen or a lower alkyl or lower alkoxy radical and X? being a counterion, which process comprises incubating in a medium comprising alkanone of the formula II in which n, Cyc and R1 are as defined above, an enzyme having a polypeptide sequence (i) SEQ ID NO: 1 or (ii) in which, compared to SEQ ID NO:1, up to 25% of the amino acid radicals have been altered by deletion, insertion, substitution or a combination thereof and which retains at least 50% of the enzymic activity of SEQ ID NO:1, with the compound of the formula II being enzymically reduced to give the compound of the formula I, and isolating the product formed.

Abstract: A process is described for preparing 3-pentenenitrile by hydrocyanating 1,3-butadiene in the presence of at least one catalyst, wherein the reaction is carried out in a loop reactor having external pumped circulation and jet nozzle for driving the internal circulation.

Abstract: A method for obtaining an acid gas stream having a pressure of from 3 to 30 bar by removal of the acid gases from a liquid stream comprising as impurities H2S and if appropriate other acid gases, the molar fraction of H2S, based on the total amount of acid gases, being at least 50 mol %, which comprises a) in at least one absorption step, bringing the fluid stream into intimate contact with a liquid absorption medium and thus producing a fluid stream substantially freed from acid gases and an acid-gas-loaded liquid absorption medium (step a), b) separating from one another the fluid stream substantially freed from acid gases and the acid-gas-loaded liquid absorption medium (step b), c) separating, by heating and if appropriate expansion or stripping, the acid-gas-loaded liquid absorption medium into an acid gas stream having a pressure of from 3 to 30 bar and a regenerated liquid absorption medium (step c) d) passing the regenerated liquid absorption medium into a heat exchanger and cooling it there, by using

Abstract: The present invention relates to a process for the preparation of N-substituted 2,6-dialkylmorpholines of the formula I in which R1 and R2, independently of one another, are hydrogen, alkyl or cycloalkyl, or R1 and R2 together with the carbon atom to which they are bonded are a 5- to 14-membered carbocycle, and R3 and R4, independently of one another, are alkyl or cycloalkyl, by reacting at least one carbonyl compound of the formula II in which R1 and R2 have the meanings given above, with at least one morpholine of the formula III in which R3 and R4 have the meanings given above, in the presence of hydrogen and at least one metal-containing catalyst, wherein the active component of the catalyst consists essentially of platinum group metals.

Abstract: A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column over the cross section of the column.

Abstract: Methods and apparatus are provided for dispensing chemical material, and in particular, granular, agricultural material, from a moving device driven over terrain to be treated with the material. A metering system for dispersing the material includes on apertured metering disk positioned above a rotatable impeller. The apertured disk meters material from a product container, by gravity feed, onto the impeller below at a rate proportional to the linear speed at which the apparatus is driven to dispense material at a uniform density over the terrain. The metering disk is a component of a product container which is removably mounted to the device. The impeller rotates at a constant speed to disperse the deposited material at a uniform distance from the apparatus, and the position on which the material is deposited on the impeller is adjustable.

Abstract: The present invention relates to laser-markable plastics, in particular thermoplastic polyurethanes, which are distinguished by the fact that they contain pigments having a coating of doped tin dioxide.

Abstract: Substituted cinnamic oxime derivatives I and cinnamic hydroxamide derivatives II ##STR1## (R.sup.1= halogen, NO.sub.2, CN, CF.sub.3 ; R.sup.2 =H, halogen; R.sup.3= H, halogen, C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -haloalkyl, C.sub.3 -C.sub.6 -cycloalkyl, C.sub.3 -C.sub.6 -alkenyl, C.sub.3 -C.sub.6 -alkynyl, hydroxy-C.sub.1 -C.sub.6 -alkyl;R.sup.4= H, halogen, CN, C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -haloalkyl orR.sup.3 +R.sup.4 =chemical bond;Y=--O--, --S--, --O--CO--, --O--SO.sub.2 -- or chemical bond;Y'=--O-- or --S--;R.sup.5= unsubst. or subst. C.sub.1 -C.sub.6 -alkyl or C.sub.1 -C.sub.6 -haloalkyl; C.sub.3 -C.sub.6 -cycloalkyl, C.sub.3 -C.sub.6 -alkenyl, C.sub.3 -C.sub.6 -alkynyl, unsubst. or subst. phenyl or phenyl-C.sub.1 -C.sub.6 -alkyl, or, if Y is --O--, --S-- or a chemical bond, is (C.sub.1 -C.sub.6 -alkyl)carbonyl or (C.sub.1 -C.sub.6 -alkoxy)carbonyl; or, if Y is a chemical bond, is hydrogen or halogen;R.sup.5 '=R.sup.5, H or (C.sub.1 -C.sub.6 -haloalkyl)carbonyl;R.sup.6= H, C.sub.1 -C.

Abstract: Finely dispersed carotenoid or retinoid suspensions are prepared by dissolving the carotenoid or retinoid in a volatile, water-miscible organic solvent at 50.degree. C.-250.degree. C., where appropriate under elevated pressure, within less than 10 sec and immediately thereafter mixing the solution with an aqueous medium at from 0 to 90.degree. C., wherein the mixing with the aqueous medium takes place in the absence of a protective colloid and in the presence of at least one physiologically tolerated emulsifier.

Abstract: Sulfonamides of the general formula I ##STR1## where R.sup.1 is hydrogen of C.sub.1 -C.sub.4 -alkyl,R.sup.2 is hydrogen or substituted or unsubstituted C.sub.1 -C.sub.6 -alkyl; C.sub.3 -C.sub.4 -alkenyl; C.sub.3 -C.sub.4 -alkynyl or substituted or unsubstituted saturated or singly unsaturated 5- to 7- membered heteroaryl;R.sup.3 and R.sup.4 are halogen; substituted or unsubstituted C.sub.1 -C.sub.4 -alkoxy C.sub.1 -C.sub.4 -alkylthio, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -alkenyloxy, C.sub.2 -C.sub.6 -alkenylthio, C.sub.2 -C.sub.6 -alkynyl, C.sub.2 -C.sub.6 -alkynyloxy, C.sub.2 -C.sub.6 -alkynylthio, C.sub.3 -C.sub.6 -cycloalkyl, C.sub.3 -C.sub.6 -cycloalkylthio, C.sub.5 -C.sub.6 -cycloalkenyl, C.sub.3 -C.sub.6 -cycloalkoxy, C.sub.5 -C.sub.6 -cycloalkenyloxy, C.sub.5 -C.sub.6 -cycloalkenylthio, phenyl, phenoxy, phenylthio, benzyl, benzyloxy or benzylthio;the group given for R.sup.2, or NR.sup.7 R.sup.8, where R.sup.7 and R.sup.8 are hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.3 -C.sub.6 -alkenyl, C.sub.

Abstract: Novel diarylacetylenes of the formula I ##STR1## where A, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 have the meanings stated in the description, are useful for the treatment of disorders.

Abstract: Acid is removed from cathodic electrocoating baths by a process in which electroconductive sub-strates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration where the ultrafiltration membrane retains the cationic resin to form an ultrafiltrate which contains water, solvent, low molecular weight substances and ions and at least a portion of the ultrafiltrate is recycled into the coating bath, and at least a portion of the ultrafiltrate is subjected to a special electrodialysis treatment before being returned into the electrocoating bath.

Abstract: Aqueous polymer dispersions essentially containing a copolymer ofa) from 85 to 98.5% by weight of methacrylates,b) from 0.5 to 4% by weight of arcylic acid and/or methacrylic acid,c) from 0.5 to 4% by weight of acrylamide and/or methacrylamide,d) from 0.5 to 4% by weight of an .alpha.,.beta.-ethylenically diunsaturated or polyunsaturated compound ande) from 0 to 3% by weight of a carbonyl-containing .alpha.,.beta.-ethylenically unsaturated compound, a process for their preparation, and their use for coating wood.

Abstract: .omega.-Formylalkanecarboxylic esters are prepared by hydroformylation of an alkenecarboxylic ester with carbon monoxide and hydrogen at elevated tempertures and under superatmospheric pressure in the presence of a cobalt carbonyl complex by a process in which an .alpha.,.beta.-unsaturated alkenecarboxylic ester is hydroformylated in the presence of from 0.01 to 1 mol %, calculated as cobalt, of a cobalt carbonyl complex, while maintaining a conversion of from 10 to 70% of .alpha.,.beta.-unsaturated alkenecarboxylic esters.

Abstract: Polymers of propene are prepared using a Ziegler-Natta catalyst system consisting of (1) a titanium component which is based on a finely divided, shape-imparting silica gel and contains titanium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component. In the process, a titanium component (1) is employed which is obtained by (1.1) first preparing (I) a carrier from (Ia) a silica gel which has a relatively high moisture content, (Ib) an organomagnesium compound and (Ic) a gaseous chlorinating agent by a method in which (1.1.1) first (Ia) is reacted with (Ib), (1.1.2) then (Ic) is passed into the mixture obtained in (1.1.1), and (I) is isolated, (1.2) thereafter a solid-phase intermediate is prepared from (I), (II) an alkanol, (III) titanium tetrachloride and (IV) a phthalic acid derivative by a procedure in which (1.2.1) first (I) is reacted with (II), (1.2.2) then (III) is introduced into the mixture resulting from (1.2.

Abstract: Novel 6-(acylaminoaryl)-3(2H)-pyridazinones of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, A and B have the meanings given in the description, and their preparation are described.[.and inhibiting thrombocyte aggregation and gastric secretion.]..The compounds are useful for treating disorders .Iadd.and inhibiting thrombocyte aggregation and gastric secretion.Iaddend..