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C H E M I C A L T R E AT M E N T TAbLE 3 TAbLE 4 Compatibility of TOL CI with different metals in 14-day tests at 60 °C Compatibility of TOL CI with different plastics in 14-day tests at 60 °C Metal Corrosion Rate (mpy) Admiralty brass 0.7 Aluminum 0.0 Copper 1.6 Mild steel 0.0 % Weight Change (Oven Dry) HDPE 0.0 –0.1 HDPP 0.3 0.0 PTFE 0.0 0.0 PE, linear 0.1 0.0 PVC 0.5 0.0 0.1 Type 316 SS % Weight Change (Air Dry) 3.5 Type 304 SS Plastic TAbLE 5 Physical properties of TOL CI with proprietary alcohol Corrosion Rate in Standard Kettle Tests Standard corrosion tests were performed in a sparged kettle test at 48.9 °C in a CO2 environment at atmospheric pressure using 50% hydrocarbon and 50% synthetic brine mixture. Figure 3 shows the results using 2 ppm of the formulated product containing the CI. The data showed good CI by reducing the corrosion rate from 154 to <13 mpy (92%) under standard test conditions. Physical Property Value Flash point 85 °C Specifc gravity @ 15.6 °C 1.12 pH, neat 6.3 Viscosity @ 4.4 °C 19.4 cp Pour point < –42.8 °C Color, clarity, and uniformity Colorless, clear, and uniform Water solubility Soluble Isopropyl alcohol solubility Soluble Kerosene solubility Insoluble Xylene solubility Insoluble Vapor Pressure and Corrosion Inhibition Table 2 shows the vapor pressure and related parameters of volatile amines and proprietary CI. The vapor pressure of morpholine, and particularly DEA, is signifcantly higher than that of MEA and CI. The vapor pressure of volatile amines is directly related to their boiling point. The corrosion rate, however, seems related to the vapor pressure (i.e., the higher the vapor pressure, the higher the corrosion rate). The most critical factor is the ability of these compounds to inhibit corrosion at very low concentrations (ppm levels). The compound that satisfes those requirements for an effective continuous TOL corrosion inhibition is the new proprietary CI (>60% inhibition), and to a lesser extent the MEA. Compatibility with Different Metals with different metals in 14-day immersion good TOL corrosion control by a newly developed TOL CI. Volatile amines, such tests at 60 °C. as DEA and MEA, had little effect on the Compatibility with TOL corrosion. These results suggest that Different Plastics the use of new continuous TOL CI is a Table 4 shows the compatibility of potential alternative to conventional the formulation for transport with dif- batch CIs currently used. ferent plastics in 14-day immersion tests at 60 °C. The results indicate that all References five plastics are compatible with the 1 Y. Gunaltun, D. Larrey, "Correlation of Cases of Top of the Line Corrosion with TOL CI. Physical Properties Table 5 shows the physical properties of the formulation. The product has a 2 Y.M. Gunaltan, A. Belghazi "Control of high fash point and a low pour point. It Top of Line Corrosion by Chemical Treatment," CORROSION 2001, is applicable to cold weather regions. Conclusions The performance of various amines/ CIs for the TOL corrosion inhibition was Table 3 shows the compatibility of the evaluated under CO2 conditions using the TOL CI-containing proprietary alcohol QCM. The lab results demonstrated NACE International, Vol. 52, No. 5 Calculated Water Condensation Rates," CORROSION 2000, paper no. 00071 (Houston, TX: NACE International, 2000). paper no. 01033 (Houston, TX: NACE, 2001). 3 G. Sauerbrey, "The Use of Quartz Oscillators for Weighing Thin Layers and for Microweighing," Eitschrift fuer Physik. 155, 1 (1959): pp. 206-222. Continued on page 60 May 2013 MATERIALS PERFORMANCE 59