CONTINUOUS SULFONATION OF POLYSTYRENE

• Main Authors: MIKUCHI FUMIHIRO, KITANO KYOZO, TERAO TOSHIMI, NAGANO KATSUMASA
• Format: Patent
• Language: English
• Published: 16.07.1988
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PURPOSE:To produce a high-purity water-soluble polystyrenesulfonate easily with a high yield and good efficiency of use of a solvent, by supplying a raw material solution in which PS has been dissolved and a sulfonating agent to a sulfonation reactor separately at a rate which satisfies specific conditions, and reacting them. CONSTITUTION:A raw material solution (a) made up of 1-100pts.wt. PS having an average m.w. of 200-50,000 dissolved in 100pts.wt. 1-2C aliphatic hydrocarbon solvent (e.g., 1,2-dichloroethane), and a sulfonating agent (b) comprising SO3 in an amount of 0.7-2.0 (molar ratio) per constituent monomer unit of the PS are separately and continuously supplied to a sulfonation reactor with a stirrer having a shearing force of 0.05N/cm or more at a rate which satisfies a conditions stipulated by the formula [wherein V1 is the linear velocity (Cm/s) of introduction of the component (b) into the reactor; V2 is the linear velocity of introduction of the component (a) into the reactor; and A is the amount of the solvent (weight ratio) per pt.wt. PS contained in the component (a)], and the sulfonating reaction is effect at 10-80 deg.C for a residence time of 1-60min.