Table 7.

Diffusion coefficients (DPA-S) of protocatechuic acid into organic phase (TOA + octanol) using Wilke- Chang equation and Reddy-Doraiswamy equation at various temperatures.

Temperature (K)	Extractant concentration (in volume %)	DPCA-S (Wilke- Chang equation) (cm2 s−1)	Average DPCA-S (Wilke- Chang equation) (cm2 s−1)	DPCA-S(Reddy-Doraiswamy equation) (cm2 s−1)	Average DPCA-S(Reddy-Doraiswamy equation) (cm2 s−1)
288	10	1.147×10−6	7.339×10−7	7.888×10−7	4.736×10−7
	20	8.230×10−7		5.406×10−7
	30	6.573×10−7		4.145×10−7
	40	5.557×10−7		3.379×10−7
	50	4.866×10−7		2.863×10−7
293	10	1.167×10−6	7.466×10-7	8.025×10−7	4.819×10−7
	20	8.373×10−7		5.500×10−7
	30	6.687×10−7		4.217×10−7
	40	5.654×10−7		3.438×10−7
	50	4.951×10−7		2.913×10−7
298	10	1.187×10−6	7.594×10−7	8.162×10−7	4.901×10−7
	20	8.516×10−7		5.593×10−7
	30	6.801×10−7		4.289×10−7
	40	5.750×10−7		3.497×10−7
	50	5.035×10−7		2.963×10−7
303	10	1.206×10−6	7.721×10−7	8.299×10−7	4.983×10−7
	20	8.659×10−7		5.687×10−7
	30	6.915×10−7		4.361×10−7
	40	5.847×10−7		3.555×10−7
	50	5.120×10−7		3.012×10−7
308	10	1.226×10−6	7.848×10−7	8.435×10−7	5.065×10−7
	20	8.802×10−7		5.781×10−7
	30	7.029×10−7		4.433×10−7
	40	5.943×10−7		3.614×10−7
	50	5.204×10−7		3.062×10−7
313	10	1.246×10−6	7.976×10−7	8.572×10−7	5.147×10−7
	20	8.944×10−7		5.875×10−7
	30	7.143×10−7		4.505×10−7
	40	6.039×10−7		3.673×10−7
	50	5.289×10−7		3.112×10−7