ASTM D611 for aniline point and mixed aniline point
ASTM D611 standard test methods for aniline point and mixed aniline point of petroleum products and hydrocarbon solvents
9. Procedure for Aniline Point
9.1 The following methods, to be used as applicable, are covered as follows:
9.1.1 Test Method A, described in detail in Annex A1, is applicable to clear samples or to samples not darker than No. 6.5 ASTM color, as determined by Test Method D1500, having initial boiling points well above the expected aniline point.
9.1.2 Test Method B, described in detail in Annex A2, is applicable to light-colored samples, moderately dark samples, and to very dark samples. It is suitable for samples that are too dark to be tested by Test Method A.
9.1.3 Test Method C, described in detail in Annex A3, is applicable to clear samples or to samples not darker than No.6.5 ASTM color, as determined by Test Method D1500, having initial boiling points sufficiently low as to give incorrect aniline point readings by Test Method A, for example, aviation gasoline.
9.1.4 Test Method D, described in detail in Annex A4, is applicable to the same type of sample as Test Method C. It is particularly useful when only limited quantities of sample are available.
9.1.5 Test Method E is applicable when using automatic apparatus in accordance with the instructions in Annex A5.
10. Procedure for Mixed Aniline Point
10.1 This procedure is applicable to samples having aniline points below the temperature at which aniline crystallizes from the mixture. Deliver 10 mL of aniline (Warning - See 7.1), 5 mL of sample, and 5 mL of n-heptane into a clean, dry apparatus. Determine the aniline point of the mixture by Test Method A or B as described in Annex A1 or Annex A2.
