Abstract: A process for preparing an aromatic polyamine mixture including 4,4?-methylenedi(phenylamine) and higher homologues of MDA is provided. The process includes steps of (i) reaction of aniline with formaldehyde by means of an acid catalyst to form a crude product mixture (I), (ii) neutralization of the crude product mixture (I) and removal of the salts formed; (iii) isolation of aniline; (iv) distillation of the resulting crude product mixture so as to separate off (iv-1) a mixture (II) of MDA isomers (II-1) containing from 8 to 20% by weight of 4,4?-methylenedi(phenylamine) and not more than 0.3% by weight of secondary components (II-2) and (iv-2) a low boiler mixture of at least 55% by weight of secondary components (II-2) and MDA isomers (II-1); and (v) recirculation of the mixture (II).

Abstract: A process for preparing an aromatic polyamine mixture including 4,4?-methylenedi(phenylamine) and higher homologues of MDA is provided. The process includes steps of (i) reaction of aniline with formaldehyde by means of an acid catalyst to form a crude product mixture (I), (ii) neutralization of the crude product mixture (I) and removal of the salts formed; (iii) isolation of aniline; (iv) distillation of the resulting crude product mixture so as to separate off (iv-1) a mixture (II) of MDA isomers (II-1) containing from 8 to 20% by weight of 4,4?-methylenedi(phenylamine) and not more than 0.3% by weight of secondary components (II-2) and (iv-2) a low boiler mixture of at least 55% by weight of secondary components (II-2) and MDA isomers (II-1); and (v) recirculation of the mixture (II).

Abstract: A method of determining a uniform global view (GS) of the system status of a distributed computer network (VRNW) comprising at least three computers (R1, R2, R3) is provided in that the computers exchange messages over communication links (KV12, KV13, KV32) in successive transmission rounds, with each of the computers receiving a message from each of the other computers in each transmission round in the absence of an error. In each transmission round, each of the computers evaluates messages received from the other computers and, based on the result of the evaluation, assigns one of at least three differently defined computer states to each of the other computers and determines a local view (LS) of the system status therefrom. The computers exchange the local views of the system status determined by them, and each of the computers determines a uniform global view (GS) of the system status from the local views exchanged.

Abstract: In a process for the elimination of germs, especially the removal of algae from water by means of water soluble quaternary ammonium compositions a polymeric salt of formula (I) ##STR1## wherein R is a C.sub.1 -C.sub.7 hydrocarbon group,m and n are a number of from 4 to 12 regardless of each other,x is a number of from 10 to 300, andhal is chlorine, bromine, or iodineis added to the water as the quaternary ammonium composition in an amount of more than 0.1 ppm and the process is carried out in the absence of heavy metal ions.