Abstract: A process for the preparation of a homogeneous spinning solution for the production of acrylic fibers, which includes: preparing an aqueous suspension of homopolymer or copolymer of acrylonitrile through the polymerization of monomers in aqueous suspension, removal of the unreacted monomers, filtration and washing of the aqueous suspension, obtaining a filtration cake; dispersing the filtration cake; and evaporating the dispersion of polymer or obtaining the homogeneous spinning solution.

Abstract: A process is described for the preparation of a homogeneous spinning solution for the production of acrylic fibers, which comprises i) a preparation step of an aqueous suspension of homopolymer or copolymer of acrylonitrile through the polymerization of monomers in aqueous suspension, removal of the unreacted monomers, filtration and washing of the aqueous suspension, obtaining a filtration cake, ii) a step for dispersing the filtration cake and a step iii) for evaporating the dispersion of polymer or obtaining the homogeneous spinning solution.

Abstract: A process is described for the preparation of a homogeneous spinning solution for the production of acrylic or modacrylic fibers which comprises the following steps: i) preparation of an intimate mixture of a homopolymer or copolymer of acrylonitrile in powder form with a solid solvent in powder form, at a temperature lower than the melting point of the solid solvent; ii) gradually heating the intimate mixture of solids coming from step i) to a temperature ranging from 70° C. to 150° C. in a time ranging from 0.5 to 30 minutes, until the complete dissolution of the homopolymer or copolymer in the solvent and the formation of a homogeneous spinning solution. Said spinning solution is then fed to a storage tank or to the spinning line.

Abstract: A process for the preparation of a homogeneous spinning solution for the production of acrylic fibers comprising: i) preparation of a homogeneous suspension by mixing a powder homopolymer or copolymer of acrylonitrile with a mixture of DMSO/water ranging from 94.5/5.5 to 97/3% w/w at a temperature ranging from 5° C. to 10° C., said mixing being carried out in a time from 5 to 30 minutes, by spraying a stream of the DMSO/water solvent onto a stream of powder homopolymer or copolymer of acrylonitrile, disgregated and premixed; ii) heating the homogeneous suspension from step i) to a temperature from 70° C. to 150° C. in a time from 0.5 to 30 minutes, until the complete dissolution of the homopolymer or copolymer and the formation of a homogeneous solution. This spinning solution is then fed to a storage tank or to the spinning line.

Abstract: A process is described for the preparation of a homogeneous spinning solution for the production of acrylic fibers which comprises the following steps: i) preparation of a homogeneous suspension by mixing a powder homopolymer or copolymer of acrylonitrile with a mixture of DMSO/water ranging from 94.5/5.5 to 97/3% w/w at a temperature ranging from 5° C. to 10° C., preferably a mixture of DMSO/water 95/5 at a temperature of 5° C., said mixing being carried out in a time ranging from 5 to 30 minutes, by spraying a stream of the DMSO/water solvent onto a stream of powder homopolymer or copolymer of acrylonitrile, disgregated and premixed; ii) heating the homogeneous suspension coming from step i) to a temperature ranging from 70° C. to 150° C. in a time ranging of from 0.5 to 30 minutes, until the complete dissolution of the homopolymer or copolymer and the formation of a homogeneous solution. This spinning solution is then fed to a storage tank or to the spinning line.