FORD FLTM BJ 004-1-2001 ANILINE POINT OF HYDROCARBON SOLVENTS.pdf

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1、 FORD LABORATORY TEST METHOD BJ 004-01 Date Action Revisions 2001 07 23 Revised Editorial no technical change A. Cockman 1992 12 16 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. ANILINE POINT OF HYDROCARBON SOLVENTS Application This procedure is intended

2、as a routine method for the determination of the aniline point of hydrocarbon solvents. If more critical aniline point determinations are required, ASTM Method D 1012 should be followed. Aniline point is the minimum equilibrium solution temperature for equal volumes of aniline and solvent. It is an

3、inherent test for the amount of aromatic and unsaturated paraffinic hydrocarbons in hydrocarbon solvents. The lower the aniline point, the greater the percentage of aromatic and unsaturated compounds and the better the solvency. Apparatus Required Test Tube A Pyrex test tube approximately 17 mm in d

4、iameter and 150 mm in length, fitted with a one-hole cork stopper is required. A 25 mm diameter test tube and 10 mL sample may also be used if preferred. Thermometer An ASTM aniline point thermometer (33 or 34 C as required) is inserted through the stopper in the center of the test tube so that the

5、bulb end reaches the liquid level of the aniline and solvent. Pipets Two 5 mL pipets are required. Heating Bath The heating bath may be an oil bath or any nonvolatile, transparent liquid bath. A water bath should not be used since aniline is hygroscopic. Cooling Bath The cooling bath should also be

6、a nonaqueous liquid. Solutions Required Aniline The aniline used for the test should be dried over potassium hydroxide pellets, decanted and then freshly distilled, discarding the first and last 10 %. FORD LABORATORY TEST METHOD BJ 004-01 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. Co

7、nditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Pipet 5 mL

8、 of aniline and 5 mL of the sample into the clean dry test tube. Note: If a reduced or mixed aniline point is specified, mix 10 mL of mineral spirits (any mineral spirits having an aniline point of 60 C) with 10 mL of the test sample. Pipet 5 mL of this mixture and 5 mL of aniline into the test tube

9、 and continue as in Step No. 2. Report as reduced or mixed aniline point. 2. Insert the cork stopper and thermometer. 3. If the minimum equilibrium solution temperature is above 23 +/- 2 C, warm until the solutions in the test tube are completely miscible. If the aniline sample mixture is completely

10、 miscible at 23 +/- 2 C, a cooling bath is substituted for the heating bath. 4. Cool the miscible sample slowly at a rate of 0.5 to 1 C per minute. Cool to a temperature of 1 to 2 C below the first appearance of turbidity and note whether the turbidity increases markedly. The true aniline point is c

11、haracterized by a turbidity which increases sharply as the temperature is lowered. 5. Record the temperature (aniline point) at which the mixture becomes cloudy throughout with complete separation of aniline and sample. This will be the minimum equilibrium solution temperature and not the temperatur

12、e of separation of minor portions of the sample. 6. Repeat the heating and cooling operations and record the temperature until consistent results are obtained within 0.2 C. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.