Abstract: For producing substantially water-insoluble, chain-type ammonium polyphosphate, equimolar quantities of diammonium phosphate and phosphorus pentoxide are reacted at temperatures from 170.degree. to 350.degree. C. in a zone, which effects continuous mixing, kneading and comminution, in the presence of a stream of ammonia gas. In this process, the water is separated from the ammonia gas which leaves the zone and contains water vapor, and the dried ammonia gas is caused to flow again through the zone.A plant for producing substantially water-insoluble, chain-type ammonium polyphosphate can comprise a reactor (1) into which an ammonia feed pipe (8) and pipes for feeding phosphorus pentoxide (6) and diammonium phosphate (7) lead and from which an ammonium polyphosphate discharge pipe (9) and an exit gas pipe (10) start. The exit gas pipe (10) leads into a condenser (13) which is flow-connected via a pump (14) to a heat exchanger (15).

Abstract: Conductive carbon black for use in depolarization masses in dry batteries is produced. To this end, an aqueous suspension of carbon black having an AS-number higher than 15 and having been obtained by subjecting hydrocarbons, which are liquid at room temperature, to thermal conversion at 1200.degree.-2000.degree. C, under 1-80 atmospheres, and in the presence of oxygen or oxygen-containing gas and, if desired, steam, and water-scrubbing the resulting carbon black-containing reaction gas, is intimately mixed at 5.degree.-120.degree. C, under 1-20 atmospheres, in liquid phase and for 1-20 minutes with 0.5-10 g, per gram of carbon black, of vaporizable aliphatic or cycloaliphatic hydrocarbons, the resulting carbon black is separated from the liquid phase, heated and thereby freed from hydrocarbons and water, and the temperature is finally increased for 2-30 minutes to 1100.degree.-2200.degree. C.