Table 2 Design matrix using CCD and bio-oil yield.

From: Design expert based optimization of the pyrolysis process for the production of cattle dung bio-oil and properties characterization

Experimental run

A: Pyrolysis temp (°C)

B: Vapour cooling temp (°C)

C: Residence time (min)

D: Gas flow rate (l min−1)

Bio-oil yield (%)

1

300

2

15

3

9.2

2

400

6

25

1

16

3

300

6

25

2

13

4

500

10

15

1

14.5

5

400

6

25

2

17.2

6

500

2

35

3

15.5

7

500

6

25

2

15.7

8

300

10

35

3

8.1

9

300

2

15

1

13.5

10

500

2

35

1

17.2

11

500

2

15

3

14.8

12

300

10

15

1

7.8

13

400

6

25

2

17.9

14

500

10

35

3

10.9

15

400

6

15

2

16.7

16

300

10

15

3

7.7

17

400

10

25

2

13.6

18

300

2

35

3

14.5

19

400

2

25

2

17.8

20

300

2

35

1

15.5

21

300

10

35

1

8.9

22

400

6

25

3

13.8

23

400

6

25

2

17.1

24

400

6

25

2

17.6

25

500

2

15

1

16.7

26

400

6

25

2

16.7

27

500

10

15

3

12.8

28

400

6

35

2

18.9

29

500

10

35

1

13.8

30

400

6

25

2

17.5

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