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Prediction chart and time converter

This table provides an easy method to estimate the time it will take to run a reaction at a different temperature than reported. Based on the Arrhenius equation, it uses the course rule of thumb that a ten degree increase in reaction temperature doubles the reaction speed. For example, if your reaction took 4 hours at 140°C, it will take approximately 2 hours at 150°C (see white numbers in the table below).

Change in field colour represents change in unit (hour/minutes/seconds). For example, if your reaction took 6 hours at 100°C, it will take approximately 5 minutes at 160°C (see red numbers in the table below).

If your reaction took 3 hours at 140°C, how long will it take at 190°C?

Temp (°C)

Times -  change in field colour represents change in unit (hour/minutes/seconds)

 

Minutes

Seconds

20

1

2

4

6

8

12

24

48

96

172

 

1

60

30

30

1

2

3

4

6

12

24

48

86

 

2

120

40

15

30

1

1.5

2

3

6

12

24

43

 

3

180

50

8

15

30

45

1

1.5

3

6

12

22

 

4

240

60

4

8

15

23

30

45

1.5

3

6

11

 

5

300

70

2

4

8

11

15

23

45

1.5

3

5

 

6

360

80

56

2

4

6

8

11

23

45

1.5

3

 

7

420

90

28

56

2

3

4

6

11

23

45

1

 

8

480

100

14

28

56

1

2

3

6

11

23

40

 

9

540

110

7

14

28

42

56

1

3

6

11

20

 

10

600

120

4

7

14

21

28

42

1

3

6

10

 

11

660

130

2

4

7

11

14

21

42

1

3

5

 

12

720

140

53

2

4

5

7

11

21

42

1

3

 

13

780

150

26

53

2

3

4

5

11

21

42

1

 

14

840

160

13

26

53

1

2

3

5

11

21

38

 

15

900

170

7

13

26

40

53

1

3

5

11

19

 

16

960

180

3

7

13

20

26

40

1

3

5

9

 

18

1020

190

2

3

7

10

13

20

40

1

3

5

 

17

1080

200

1

2

3

5

7

10

20

40

1

2

 

19

1140

210

 

1

2

2

3

5

10

20

40

1

 

20

1200

220

 

 

1

1

2

2

5

10

20

35

 

25

1500

230

 

 

 

 

1

1

2

5

10

18

 

30

1800

240

 

 

 

 

 

1

1

2

5

9

 

45

2700

250

 

 

 

 

 

 

 

1

2

4

 

60

3600

With courtesy of David Rudge, AstraZeneca, Macclesfield, UK