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Comparing Predicted Calculation with Experimental Data

The following table provides a comparison of breakthrough times calculated using the Wood1 model versus experimental data2. The percent variation of the calculated from the experimental values is also presented.
  1. Wood, G.O., Estimating Service Lives of Organic Vapor Cartridges, American Industrial Hygiene Association Journal, 55:11-15 (1994).
     
  2. Nelson, G.O., A.N. Correia, Respirator cartridge efficiency studies: VIII. Summary and conclusions, American Industrial Hygiene Association Journal, 37:514-525 (1976).
The following standard conditions were used:

    Contaminant concentration: 1000 ppm
    Number of respirator cartridges: 2
    Sorbent: Activated charcoal, the specific source varied with manufacturer
    Sorbent mass per cartridge: 

      Experimental—25-40 g, the amount varied with manufacturer
      Calculated—26 g

    Flow rate: 53.3 liters per minute
    Temperature: 22 degrees Celsius
    Relative humidity: 50%
    Preconditioning humidity: 50% (for experimental)

 
Compound Name

1% Breakthrough

10% Breakthrough

Model Experimental

Model vs Exp.

Model Experimental

Model vs Exp.

Aromatics
Benzene

56

73

-22.3%

68

88

-23.1%

Toluene

61

94

-34.5%

72

114

-36.4%

Ethylbenzene

60

83

-27.4%

70

105

-33.1%

m-Xylene

60

98

-38.3%

70

116

-39.3%

Cumene

56

81

-30.5%

64

103

-37.2%

Mesitylene

57

85

-33.3%

65

105

-37.6%

p-Cymene

52

75

-30.8%

59

92

-36.0%

Alcohols
Methanol

2

0

990.0%

5

3

54.3%

Ethanol

30

28

7.1%

43

45

-4.8%

Isopropanol

47

54

-12.1%

61

81

-24.8%

Allyl alcohol

69

65

5.9%

87

105

-16.5%

Propanol

56

85

-34.2%

73

123

-40.5%

sec-Butanol

58

96

-38.7%

72

121

-39.8%

Butanol

68

115

-40.3%

84

141

-40.3%

2-Pentanol

63

86

-27.4%

75

111

-32.2%

3-Methyl-1-butanol

66

97

-31.9%

78

121

-34.8%

4-Methyl-2-pentanol

57

75

-23.2%

67

96

-29.4%

Pentanol

66

103

-35.1%

79

130

-38.6%

2-Ethyl-1-butanol

61

76

-19.2%

72

101

-28.3%

Monochlorides
Methyl chloride

2

0

3821.5%

2

0

320.8%

Vinyl chloride

7

3

94.6%

9

6

44.5%

Ethyl chloride

18

5

220.2%

22

10

114.0%

2-Chloropropane

27

26

5.7%

34

35

-4.7%

Allyl chloride

32

30

5.9%

40

44

-9.6%

1-Chloropropane

43

24

78.3%

52

38

36.9%

2-Chloro-2-methylpropane 

46

37

23.7%

54

52

3.6%

1-Chlorobutane

51

72

-28.1%

61

88

-30.4%

2-Chloro-2-methylbutane

46

58

-20.2%

55

79

-30.3%

1-Chloropentane

52

74

-29.1%

62

96

-35.6%

Chlorocyclopentane

77

106

Chlorobenzene

72

107

-32.6%

83

131

-36.3%

1-Chlorohexane

53

77

-30.6%

62

95

-35.1%

o-Chlorotoluene

65

102

-35.3%

76

122

-37.5%

1-Chloroheptane

49

81

-39.7%

56

101

-44.1%

3-(Chloromethyl) heptane

42

63

-33.1%

48

80

-40.1%

Dichlorides
Dichloromethane

21

10

111.8%

28

15

77.8%

trans-1,2-Dichloroethylene

35

33

7.5%

44

50

-12.1%

1,1-Dichloroethane

29

23

24.4%

35

40

-10.4%

cis-1,2-Dichloroethylene

40

29

36.5%

50

42

19.2%

1,2-Dichloroethane

48

54

-10.7%

60

79

-24.3%

1,2-Dichloropropane

55

65

-14.0%

67

90

-25.6%

cis-1,2-Dichloropropene

85

110

trans-1,2-Dichloropropene

108

129

1,4-Dichlorobutane

54

109

-49.9%

64

132

-51.3%

o-Dichlorobenzene

70

81

Trichlorides
Chloroform

42

33

27.7%

52

52

0.0%

Methyl chloroform

48

40

19.3%

57

58

-1.8%

Trichloroethylene

56

55

2.7%

68

83

-17.7%

1,1,2-Trichloroethane

65

71

-9.4%

77

112

-30.4%

1,2,3-Trichloropropane

69

111

-37.5%

81

132

-38.2%

Tetrachlorides
Carbon tetrachloride

51

77

-33.1%

61

90

-31.5%

Perchloroethylene

65

107

-38.5%

77

129

-40.0%

1,1,2,2-Tetrachloroethane

69

104

-33.2%

81

131

-37.7%

Pentachlorides
Pentachloroethane

63

93

-31.5%

73

117

-36.8%

Acetates
Methyl acetate

27

32

-14.9%

36

46

-22.3%

Vinyl acetate

39

55

-27.8%

49

81

-39.0%

Ethyl acetate

43

66

-35.1%

53

84

-37.1%

Isopropyl acetate

47

64

-26.8%

56

85

-34.2%

Isopropenyl acetate

80

106

Propyl acetate

51

78

-34.6%

61

99

-37.9%

Allyl acetate

75

95

sec-Butyl acetate

82

101

Butyl acetate

53

77

-31.1%

62

96

-35.7%

Isopentyl acetate

51

70

-26.9%

59

88

-32.3%

1,3-Dimethylbutyl acetate

60

76

Pentyl acetate

52

72

-28.2%

60

87

-31.2%

Hexyl acetate

48

67

-28.2%

55

85

-35.4%

Ketones
Acetone

23

37

-37.7%

30

46

-33.4%

2-Butanone

42

81

-48.2%

52

94

-43.9%

2-Pentanone

52

104

-49.8%

62

121

-48.0%

3-Pentanone

53

93

-43.3%

63

114

-44.0%

4-Methyl-2-pentanone

53

96

-44.8%

62

111

-43.7%

Mesityl oxide

61

122

-49.8%

72

139

-48.2%

Cyclopentanone

68

141

-51.5%

83

161

-48.3%

2,4-Pentanedione

65

130

-49.7%

78

144

-45.7%

3-Heptanone

54

91

-40.1%

63

105

-39.7%

2-Heptanone

47

101

-53.4%

54

114

-52.1%

Cyclohexanone

68

126

-45.3%

81

144

-43.1%

5-Methyl-3-heptanone

86

99

3-Methylcyclohexanone

100

123

Diisobutyl ketone

46

70

-34.8%

52

83

-37.0%

4-Methylcyclohexanone

111

126

Alkanes
Pentane

30

60

-49.4%

37

71

-48.1%

2,3-Dimethylbutane

38

72

-46.3%

45

81

-43.8%

Hexane

40

52

-21.9%

48

64

-25.6%

Methylcyclopentane

45

62

-27.3%

53

76

-29.5%

Cyclohexane

49

68

-28.3%

58

82

-29.0%

2,2,4-Trimethylpentane

42

68

48

80

Heptane

45

78

-33.3%

52

89

-34.3%

Methylcyclohexane

51

68

-34.7%

59

80

-33.8%

1,3,5-Cycloheptatriene

121

136

2,2,5-Trimethylhexane

42

67

-64.8%

48

80

-64.4%

5-Ethylidene-2-norbornene

86

101

Cyclooctane

46

96

-46.8%

53

113

-47.4%

Nonane

44

76

-53.7%

51

89

-54.7%

Decane

42

70

-44.3%

48

81

-46.2%

Amines
Methylamine

1

12

-89.5%

2

17

-88.8%

Dimethylamine

10

17

-40.3%

13

21

-37.7%

Ethylamine

18

40

-53.3%

24

49

-51.4%

Isopropylamine

23

65

-63.5%

30

75

-60.2%

Propylamine

29

90

-66.7%

37

111

-66.0%

Diethylamine

41

88

-52.8%

49

105

-52.5%

Butylamine

47

110

-56.9%

57

125

-54.0%

Triethylamine

45

81

-43.4%

53

91

-41.2%

Dipropylamine

50

93

-45.8%

58

105

-44.1%

Diisopropylamine

44

77

-42.4%

51

87

-40.8%

Cyclohexylamine

59

112

-47.2%

69

128

-45.9%

Dibutylamine

47

75

-36.8%

54

84

-35.7%

Miscellaneous
Methyl iodide

39

11

241.3%

49

17

179.6%

Acrylonitrile

72

48

50.1%

90

61

48.7%

Dibromomethane

73

82

-10.4%

89

121

-26.1%

Pyridine

71

119

-39.5%

87

>

134

-34.9%

Epichlorohydrin

67

85

-20.9%

84

110

-23.4%

2-Methoxyethanol

116

145

1,2-Dibromoethane

76

>

141

-45.8%

91

165

-44.8%

1-Nitropropane

65

143

-54.3%

80

164

-50.8%

2-Ethoxyethanol

67

77

-12.5%

81

123

-33.4%

Acetic anhydride

67

124

-45.2%

83

138

-39.6%

2-Methoxyethyl acetate

60

93

-35.0%

71

113

-36.5%

Bromobenzene

73

142

-48.1%

84

159

-46.6%

2-Ethoxyethyl acetate

56

79

-28.8%

66

96

-31.6%

  

 

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