FPH price (USD /kg) FPCP purchase cost (USD /kg) 10 20 25 30 35 40 3 N/A* (-51.1%) N/A (-16.6%) 199.52 (0.5%) 9.17 (10.9%) 4.70 (21.3%) 3.15 (31.7%) 2 N/A (-23.6%) 13.81 (7.2%) 5.57 (17.9%) 3.49 (28.6%) 2.54 (39.3%) 2.00 (50.0%) 1 0 29.70 (3.3%) 4.55 (21.9%) 3.94 (25.4%) 2.24 (44.7%) 2.74 (36.4%) 1.78 (56.0%) 2.11 (47.4%) 1.48 (67.4%) 1.71 (58.4%) 1.27 (78.7%) 1.44 (69.4%) 1.11 (90.1%) *N/A: not available, which means no payback time.

Table 9: Impact of the FPCP purchase cost and FPH selling price on investment payback time and return on investment (in bracket), based on the microwave-intensified enzymatic process with the production yield of 500 kg per batch.