| 摘要 |
A method of purifying a polyarylene sulfide, including washing a polyarylene sulfide with a wash liquid, separating the resulting mixture into a polymer phase ( 8 ) containing the polyarylene sulfide and a solution phase ( 9 ) containing the wash liquid, measuring a viscosity of the polymer phase ( 8 ) or a difference in viscosity between the polymer phase ( 8 ) and the solution phase ( 9 ) to detect the liquid level ( 10 ) of the polymer phase ( 8 ), and taking out the polymer phase ( 8 ). The viscosity of the polymer phase ( 8 ) or the difference in density between the polymer phase ( 8 ) and the solution phase ( 9 ) is measured with a vibratile process viscometer ( 7 ) or remote seal type differential pressure oscillator ( 6 ) having a liquid-contact portion ( 11 ) constituted of stainless steel, a hastelloy alloy, Ti or a Ti alloy, so that the liquid level ( 10 ) of the polymer phase ( 8 ) can be accurately detected.
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