Abstract: A novel crystallographic modification (.beta.-modification) of the pigment C. I. Pigment Red 53:1 is described and claimed which has characteristic reflection values in its X-ray diffraction pattern obtained by means of Cu-K.sub..alpha. radiation. This novel pigment form is obtained by reacting an aqueous solution of an alkali metal or ammonium salt of the formula 1 ##STR1## with the equivalent amount of a water-soluble barium salt in the presence of a compound of the formula 2 ##STR2## The modification is distinguished by a more yellowish-red shade as compared to the known .alpha.-modification.

Abstract: Sulfonated tributylphenol ethoxylates of the formula ##STR1## where x denotes a number from 2 to 20, and M denotes a cation, their use as surfactants, in particular as auxiliaries in the tertiary production of crude oil, and an improved, general process for preparing sulfonated alkyl and (alkyl)aryl polyalkoxylates by reacting halides of alkyl and (alkyl)aryl polyethoxylates with alkali metal sulfite by carrying out the reaction in the presence of lower alcohols, polyols, monoethylene glycol, polyethylene glycol or alkyl ethers thereof, as solubilizing agents.

Abstract: Thus, the invention relates to compounds of the formula I ##STR1## where R is aromatic, preferably phenylene, R.sub.1 and R.sub.2 denote C.sub.1 -C.sub.4 -alkyl, preferably C.sub.1 -C.sub.2 -alkyl, R.sub.3 denotes methyl or ethyl, x and z together denote a number from 2 to 360, preferably from 2 to 140, y denotes a number from 15 to 70, preferably 25 to 60, n denotes a number from 1 to 10 and A.sup.- denotes an anion, preferably chloride or bromide, a process for their preparation and their use as demulsifiers for demulsifying crude oil emulsions and as corrosion inhibitors in equipment for lifting and processing natural gas and crude oil.

Abstract: Polymeric ethylene oxide/propylene oxide or ethylene oxide/butylene oxide ether carboxylic acids of the formula ##STR1## wherein R denotes methyl or ethyl, preferably methyl, A denotes hydrogen or a metal cation, preferably Na.sup.(+) or K.sup.(+), X and Z together denote a number from 2 to 360, preferably from 2 to 140, y denotes a number from 15 to 70, preferably from 25 to 70 and n denotes a number from 1 to 10, a process for their preparation and their use as surfactants.