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
A3. TEST METHOD C
A3.1 Apparatus
A3.1.1 Aniline-Point Tube, of heat-resistant glass, of the shape and dimensions shown in Fig. A3.1, and fitted internally with a thin-walled glass thermometer tube, sealed at the lower end. The latter tube accommodates a tight-fitting cork stopper carrying the thermometer, the bulb of which rests on a cork ring or disk placed at the bottom of the tube; the tube contains sufficient light transformer oil to cover the bulb of the thermometer. The inner tube is held in the top of the aniline-point tube by a tightly fitting stopper, and a clamp is provided to hold the stopper in position to prevent loss of vapor from the sample.
NOTE A3.1 - Any other suitable arrangement, such as a screwed plastic gland carrying the thermometer, that will prevent the loss of vapor from the apparatus, may be used. In such cases it may be possible to omit the thermometer tube and immerse the thermometer bulb in the aniline-sample mixture.
A3.1.2 Guard, of stout metal gauze and surrounding the aniline point tube. It should preferably be combined with the clamp for holding the thermometer tube in place.
A3.2 Procedure
A3.2.1 Clean and dry the apparatus. Deliver 5 mL of aniline (Warning - Put on goggles of safety glass and plastic gloves impervious to aniline. Also see 7.1) and 5 mL of the dried sample (8.1), both cooled to a temperature at which the sample may be measured without loss of vapor. Close the tube by means of the stopper and fit the thermometer tube centrally so that the bottom is 5 mm from the bottom of the aniline point tube. Clamp the stopper in position and attach the guard.
A3.2.2 Follow the procedure described in A1.2.2 and A1.2.3 but mix the sample and aniline by shaking the tube. If the rate of change of temperature is greater than 1°C (2°F)/min when the aniline point is being approached, place the tube in a jacket that has previously been warmed or cooled to an appropriate temperature.
A3.2.3 Repeat the observation of aniline point by heating and cooling repeatedly until a report as directed in Section 11 can be made.
