Abstract: The invention relates to a process for liquefying a hydrocarbon-rich, nitrogen-containing feed fraction, preferably natural gas, wherein: a) the feed fraction (1) is liquefied (E1, E2), b) is separated by rectification (T1) into a nitrogen-enriched fraction (9), the methane content of which is a max. of 1% by volume, and a hydrocarbon-rich, nitrogen-depleted fraction (4), c) the hydrocarbon-rich, nitrogen-depleted fraction (4) is subcooled (E3) and expanded (b), d) the expanded hydrocarbon-rich, nitrogen-depleted fraction (5) is separated (D1) into a hydrocarbon-rich fraction (6), the nitrogen content of which is a max. of 1% by volume, and a nitrogen-rich fraction (7), and e) the nitrogen-rich fraction (7) is added to the feed fraction (1).

Abstract: A blast tuyere for shaft furnaces, includes a conical hollow main body having inner and outer casings defining a hollow space and interconnected by a tuyere nose. The outer casing is formed by a single-piece base body terminating smoothly in the tuyere nose, and the inner casing is formed by a conical weld-in part. The hollow space is divided in antechamber, adjacent the tuyere nose, and main chamber, completely separated hydraulically and including separate coolant circuits. The coolant circuit for the antechamber includes two parallel passages for supply and return of coolant. The passages terminate in a ring channel, arranged in the tuyere nose in a direction transversely to the passages, and are located in an area of an upper apex of the main body radially outside the main chamber. The coolant circuit for the main chamber includes a helical cooling passageway whose inner wall is formed by the weld-in part.

Abstract: In a process for operating a charge shift store in which, for the regeneration of the data contained in storage loops, the data is advanced over regeneration stages in dependence upon a regeneration pulse train. In the input and output processes, items of data are written in via an input stage and read out via an output stage in dependence upon an operating pulse train. The items of data contained in the storage elements of the individual storage loops are regenerated in a full cycle only after the expiration of the maximum storage time of the storage elements. The operating pulse train is employed as a regeneration pulse train in this process.