Table 4.

Effective diffusivity and thiele modulus on the internal mass transfer

pH	Temperature (°C)	20:1		30:1
		Deff (m2 s−1)	ϕ	Deff (m2 s−1)	ϕ
5	20	5.85 × 10−10	19.21	5.78 × 10−10	18.59
5	50	5.88 × 10−10	19.34	6.07 × 10−10	21.07
5	80	5.90 × 10−10	24.02	5.94 × 10−10	23.38
7	20	7.16 × 10−10	14.08	6.14 × 10−10	17.47
7	50	7.24 × 10−10	16.72	6.14 × 10−10	19.02
7	80	7.16 × 10−10	21.41	9.01 × 10−10	19.72
9	20	5.92 × 10−10	22.54	7.13 × 10−10	20.86
9	50	6.03 × 10−10	26.81	6.07 × 10−10	27.20
9	80	7.01 × 10−10	19.99	5.94 × 10−10	22.52