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Freeze/Flash Point
QUESTION(S)
1. What are the freezing points of water/Methanol ; water/Ethylene Glycol;
water/Propylene Glycol mixtures ?
Answer:
|
Methanol \ Water Mixtures |
| |
Methanol Conc.
Wt. % (Vol.%) |
Freezing Point,
F(C) |
Flash Point,
(TCC) F (C) |
|
0 (0) |
32 (0) |
No
Flash |
|
10
(13) |
20
(-7) |
130
(54) |
|
20
(24) |
0
(-18) |
110
(43) |
|
30
(35) |
-15
(-26) |
95
(35) |
|
40
(46) |
-40
(-40) |
85
(29) |
|
50
(56) |
-65
(-54) |
75
(24) |
|
60
(66) |
-95
(-71) |
70
(21) |
|
70
(75) |
-215
(<-73) |
60
(16) |
|
80
(83) |
-225
(<-73) |
55
(13) |
|
90
(92) |
-230
(<-73) |
55
(13) |
|
100
(100) |
-145
(<-73) |
55
(13) |
|
Ethylene Glycol / Water Mixtures |
| |
EG Conc
Wt.% (Vol.%) |
Freezing Point,
F(C) |
Boiling Point,
F (C) |
|
0 (0 |
32 (0) |
212
(100) |
|
10 (9)
|
25
(-4) |
215
(102) |
|
20
(18) |
20
(-7) |
215
(102) |
|
30
(28) |
5
(-15) |
220
(104) |
|
40
(38) |
-10
(-23) |
220
(104) |
|
50
(48) |
-30
(-34) |
225
(107) |
|
60
(58) |
-55
(-48) |
230
(110) |
|
70
(68) |
<-60
(<-51) |
240
(116) |
|
80
(79) |
-50
(-46) |
255
(124) |
|
90
(90) |
-20
(-29) |
285
(141) |
|
100
(100) |
10
(-12) |
390
(199) |
|
Propylene Glycol / Water
Mixtures |
| |
PG Conc.
Wt.% (Vol.%) |
Freezing Point,
F(C) |
Boiling Point,
F (C) |
|
0 (0) |
32 (0) |
212
(100) |
|
10
(10) |
25
(-4) |
212
(100) |
|
20
(19) |
20
(-7) |
215
(102) |
|
30
(29) |
10
(-12) |
215
(102) |
|
40
(40) |
-5
(-21) |
220
(104) |
|
50
(50) |
-30
(-34) |
220
(104) |
|
60
(60) |
-60
(-51) |
225
(107) |
|
70
(70) |
<-60
(<-51) |
230
(110) |
|
80
(80) |
<-60
(<-51) |
245
(118) |
|
90
(90) |
<-60
(<-51) |
270
(132) |
|
100
(100) |
<-60
(<-51) |
370
(188) |
2. We have a problem with ethanolamines freezing in cold weather. Is
there any solution available?
Answer:
Yes. If water can be tolerated in your process, low freezing grades of
ethanolamines which contain 15 percent water are available. The added water
lowers the freezing point of the amines much more than might be expected. Some isopropanolamines are also available in low freezing grades. The following table
shows the comparison:
|
Amine Product
|
Freezing Pt. (°F)
Standard Grade
|
Freezing Pt (°F) Low
Freeze Grade
|
|
Monoethanolamine |
50
|
9
|
|
Diethanolamine |
82
|
28
|
|
Triethanolamine 85% |
70
|
14
|
|
Triethanolamine 99% |
70
|
16
|
|
Monoisopropanolamine |
37
|
LF Grade Not Available
|
|
Diisopropanolamine |
111
|
55
|
|
Triisopropanolamine |
111
|
approx. 41
|
3. What are the freezing and flash points of water / Isopropanol
mixtures?
Answer:
Isopropanol / Water Mixtures
|
IPA Conc. Vol. %
(Wt.)
|
Freezing Point, F(C)
|
Flash Point, (TCC) F
(C)
|
|
0 (0)
|
32 (0)
|
No Flash
|
|
10 (8)
|
25 (- 4)
|
105 (41)
|
|
20 (17)
|
20 (- 7)
|
85 (29)
|
|
30 (26)
|
5 (- 15)
|
75 (24)
|
|
40 (34)
|
0 (- 18)
|
70 (21)
|
|
50 (44)
|
- 5 (- 21)
|
65 (18)
|
|
60 (54)
|
- 10 (- 23)
|
65 (18)
|
|
70 (65)
|
- 20 (- 29)
|
65 (18)
|
|
80 (76)
|
* - 35 (- 37)
|
65 (18)
|
|
90 (88)
|
* - 70 (- 57)
|
65 (18)
|
|
100 (100)
|
* -130 (<-73)
|
53 (12)
|
*
Temperatures at which super cooling often occurs.
4. What are the freezing and flash points of water / Ethanol
mixtures?
Answer:
Ethanol / Water Mixtures
|
EtOH Conc. Vol. %
(Wt.)
|
Freezing Point, F(C)
|
Flash Point, (TCC) F
(C)
|
|
0 (0)
|
32 (0)
|
No Flash
|
|
10 (8)
|
25 (- 4)
|
135 (57)
|
|
20 (17)
|
15 (- 9)
|
105 (41)
|
|
30 (26)
|
5 (- 15)
|
90 (32)
|
|
40 (34)
|
-10 (- 23)
|
80 (27)
|
|
50 (44)
|
- 25 (- 32)
|
80 (27)
|
|
60 (54)
|
- 35(- 37)
|
80 (27)
|
|
70 (65)
|
*- 55(- 48)
|
80 (27)
|
|
80 (76)
|
* - 75 (- 59)
|
75 (24)
|
|
90 (88)
|
* - 110 (<-73)
|
65 (18)
|
|
100 (100)
|
* -175 (<-73)
|
55 (13)
|
*
Temperatures at which super cooling often occurs.
5. Should I be concerned about the freezing point of
solvents?
Answer:
Most solvents have a low enough freezing point that storage is not a problem.
However, there are those that are exceptions such as tert-Butanol with a
freezing point of 79°F and Cyclohexane with a freezing point of 43°F.
6. We have freezing problems with Caustic
Soda (Sodium Hydroxide) 50 percent liquid. Are there other alternatives?
Answer:
Caustic Soda liquid 50% has a freezing point of approximately 52-54°F, mixtures
of Caustic Potash 45% (Potassium Hydroxide) and Caustic Soda 50% (Sodium
Hydroxide) liquid can be used to lower the freezing point without a large
reduction in active alkalinity.
|
45 % Caustic Potash
liquid, wt %
|
50 % Caustic Soda
liquid, wt %
|
Freezing point °F
|
Reduction in Active
Alkalinity %
|
|
0
|
100
|
52-54
|
0
|
|
5
|
95
|
30
|
1.8
|
|
10
|
90
|
15
|
3.6
|
|
20
|
80
|
10
|
7.2
|
|
25
|
75
|
5
|
9.0
|
Source: Ashland Chemical Corporation. www.ashchem.com
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