To evaluate four binary azeotropes for removing quench oil from aluminum coupons using immersion cleaning.
Date Run:
02/07/2007
Experiment Procedure:
The four supplied solvents were mixed with DI water in 600 ml beakers to obtain binary azeotropes. Methyl Acetate (MeOAc) was mixed with water (95% water) and heated to 56.1 C on a hot plate. T-Butyl Acetate (t-BAc) was mixed with water (16.5% water) and heated to boiling at 87.4 C. Propylene Glycol Methyl Ether (PGME) was mixed with water (51% water) and heated to 97.5 C. The final blend consisted of Heptane mixed with water (12.9% water) and heated to 79.2 C.
Twelve preweighed aluminum coupons were coated with Castrol Quench G oil (64742-55-8, 64742-65-0, 8052-42-4) with a handheld swab. Coupons were weighed again to determine the amount of oil applied. Three coupons were cleaned in each azeotrope for five minutes at the boiling point, rinsed for 15 seconds in 120 F tap water and dried for 30 seconds using compressed air at room temperature. Coupons were weighed a third time to determine the amount of oil remaining. Efficiencies were calculated and recorded.
Trial Results:
During cleaning the MeOAc did not boil at the specified temperature (56.1 C). Cleaning was performed at this point. Following cleaning, the solution was heated to determine the boiling point. The measured boiling point was 83-84 C. The three other azeotropes boiled at the expected temperatures. Three of the four products removed over 85% of the quench oil. The only ineffective product was the MeOAc. The table lists the amount of soil added, the amount remaining, and the efficiency of each coupon cleaned.
Azeotrope
Initial wt
Final wt
% Removed
MeOAc
0.1305
0.0738
43.45
0.2221
0.0920
58.58
0.3559
0.1039
70.81
t-BAc
0.3062
0.0379
87.62
0.3093
0.0104
96.64
0.3078
0.0022
99.29
PGME
0.1967
0.0317
83.88
0.2744
0.0228
91.69
0.2452
0.0182
92.58
Heptane
0.3093
0.0005
99.84
0.2387
-0.0005
100.21
0.3204
0.0001
99.97
Success Rating:
A follow up test, usually based on company input.
Conclusion:
The heptane-water azeotrope removed 100% of the quench oil, the t-Bac-water removed 94%, PGME-water removed 89% and the MeOAc removed under 60%.
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