Process for the production of polyarenazole yarn

The invention claims a method for preparing aromatic compound and a multifilament yarn a continuous method the method comprises: Containing the compound poly aryl and polymer and a phosphoric acid solution and through several spinneret hole to make a plurality of filaments; The said filament is formed by the multifilament yarn; Through heating the yarn to a temperature above about 120 centigrade for record and the highest reach about 2 minutes the yarn at least some of hydrolyzing polyphosphoric acid; From yarn washing at least some of the hydrolyzed polyphosphoric acid; The cleaning of the yarn drying; Optionally to heating the yarn above about 300 centigrade and g to every minute at least about 50 meters the speed of the collection of yarn.