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Method for dissolving PPTA in sulfuric acid using a twin screw extruder
Method for dissolving PPTA in sulfuric acid using a twin screw extruder
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机译:用双螺杆挤出机将PPTA溶解在硫酸中的方法
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摘要
The invention pertains to a method for dissolving PPTA or copolymers thereof in sulfuric acid using a twin screw extruder having transporting, mixing, and kneading elements comprising an entering zone, an intermediate zone, a mixing zone, a negative transport zone, a degassing zone, and a pressure build-up zone, the method comprising the steps: transporting PPTA or copolymer thereof into the entering zone at a transport capacity low enough as to prevent sulfuric acid entering the entering zone; entering sulfuric acid in the intermediate zone; essentially fully filling the mixing zone to allow sufficient time to mix and dissolve PPTA or copolymer thereof in the sulfuric acid to obtain a PPTA or copolymer thereof - sulfuric acid solution; creating after the mixing zone a negative transport zone to obtain a product lock between the mixing zone and the degassing zone; creating a thin film of the PPTA or copolymer thereof - sulfuric acid solution in the degassing zone to degas the solution; entering the solution into the output pressure build-up zone to partially fill this zone and to leave the twin screw extruder.
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