Abstract: A method and apparatus for the production of rayon and for the continuous processing of filaments is disclosed. Filament threads are formed in a spinning column in which they are completely regenerated and stretched by the action of a constant temperature coagulating solution. The total length of the spinning column considerably exceeds the length of the column portion in which the rayon yarns are formed. The coagulating solution, after the formation of the rayon yarns, flows at a speed less than that of the threads at the column outlet eliminating an entire zone to the treatment of spun threads with strong high-temperature solution, heretofore necessary for complete regeneration of the threads.

Abstract: A process for the removal of hydrogen fluoride and/or hydrogen chloride from gases comprising passing the gas to be purified through anion-exchange sorbent composed of a textured chemisorption fiber based on carbo-chain polymers with vinylpyridine groups or aliphatic amino groups. On exhaustion the sorbent is regenerated with water.The process of the present invention makes it possible to purify gases substantially completely irrespective of the initial concentrations of impurities in the gas being treated and ensures practically unlimited number of sorption-regeneration cycles with the same sorbent.