The mass transfer rate between solid particles and liquid and the critical frequency for complete suspension in a reciprocal shaking vessel were studied. The solid-liquid mass transfer coefficient of the reciprocal shaking can be correlated with the same correlation as that of a rotational shaking at higher shaking frequencies than the critical shaking frequency for complete suspension, N-JS.k(L)d(p)/D = 0.112[d(p)(4)P(v)/(rhov(3))]Sc-0.29(1/3) (N-JS < N < N-tr3)The critical shaking frequency N-JS was 20% higher than that of the rotational shaking, which was correlated with the following equation.N-JS = 0.70d(P)(0.06) (rhoDeltarho/rho(L))X-0.04(0.03)/(D(0.35)d(0.17)root(0.04)).