b=RT。/8P bn=∑y SRK方程 RT v(v+b) a1=aci·aa(r) an,=0.42748R2T2/P =p+m-(/r m1=0.48508+1.55171m-0.1561302 y b=∑y RT a b 0 Zm=PV/RT=V/V, -b)-a/RTV, 2√aa InI z RTt K Vi Yi ④"P 当x;→1时 ni=f/xfbi = RTc,i 8Pc,i ( ) 2 m =  i ai a y m =  ibi b y SRK 方程： v(v b) a v b RT P + − − = ai ac,i  i(T ) = • c,i c,i i ac, R T P 2 2 = 0.42748 ( )   ( )  2 0.5 i T = 1+ mi 1- T Tc,i i mi i 2 = 0.48508 +1.55171 − 0.15613 ( ) 2 =  i ai a y =  ibi b y  + − = 0      − + P ab V P a V P RT Vt b t t 3 2 ( ) Zm = PVt RT =Vt Vt − b − a RTVt t i m t i i RTV aa ln Z V b b ˆ ln 2 V b 1- t  −              − −  = ˆ P f x y K V i oL i i i i i   = = (2-17) 当 xi →1 时，  i →1 (2-18) L i i L i i f ˆ f x ˆ  = (2-19)