Punto de anilina

Páginas: 20 (4794 palabras) Publicado: 12 de noviembre de 2011
Designation: D 611 – 82 (Reapproved 1998) Designation: 2/91
AMERICAN SOCIETY FOR TESTING AND MATERIALS 100 Barr Harbor Dr., West Conshohocken, PA 19428 Reprinted from the Annual Book of ASTM Standards. Copyright ASTM

An American National Standard

Standard Test Methods for

Aniline Point and Mixed Aniline Point of Petroleum Products and Hydrocarbon Solvents1
This standard is issued underthe fixed designation D 611; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. These test methods were adopted as a joint ASTM-IP standard in 1964.This standard has been approved for use by agencies of the Department of Defense.

1. Scope 1.1 These test methods cover the determination of the aniline point of petroleum products and hydrocarbon solvents. Method A is suitable for transparent samples with an initial boiling point above room temperature and where the aniline point is below the bubble point and above the solidification point ofthe aniline-sample mixture. Method B, a thin-film method, is suitable for samples too dark for testing by Method A. Methods C and D are for samples that may vaporize appreciably at the aniline point. Method D is particularly suitable where only small quantities of sample are available. Method E describes a procedure using an automatic apparatus suitable for the range covered by Methods A and B. 1.2These test methods also cover the determination of the mixed aniline point of petroleum products and hydrocarbon solvents having aniline points below the temperature at which aniline will crystallize from the aniline-sample mixture. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Sections 7.1 and 7.3. 2. Referenced Documents 2.1 ASTM Standards: D 1015 Test Method for Freezing Points of High-Purity Hydrocarbons2 D 1217 Test Method for Density and Relative Density (Specific Gravity) of Liquids by BinghamPycnometer2 D 1218 Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids2
1 These test methods are under the jurisdiction of ASTM Committee D-2 on Petroleum Products and Lubricantsand are the direct responsibility of D02.04on Hydrocarbon Analysis. Current edition approved Aug. 27, 1982. Published January 1983. Originally published as D 611 – 41 T. Last previous edition D 611 –77. 2 Annual Book of ASTM Standards, Vol 05.01.

D 1500 Test Method for ASTM Color of Petroleum Products (ASTM Color Scale)2 D 2700 Test Method for Knock Characteristics of Motor and Aviation Fuels by the Motor Method3 E 1 Specification for ASTM Thermometers4 3. Terminology 3.1 Definitions: 3.1.1 aniline point—the minimum equilibrium solution temperature for equal volumes of aniline and sample.3.1.2 mixed aniline point—the minimum equilibrium solution temperature of a mixture of two volumes of aniline, one volume of sample, and one volume of n-heptane of specified purity. 4. Summary of Test Methods 4.1 Specified volumes of aniline and sample, or aniline and sample plus n-heptane, are placed in a tube and mixed mechanically. The mixture is heated at a controlled rate until the two phasesbecome miscible. The mixture is then cooled at a controlled rate and the temperature at which two phases separate is recorded as the aniline point or mixed aniline point. 5. Significance and Use 5.1 The aniline point (or mixed aniline point) is useful as an aid in the characterization of pure hydrocarbons and in the analysis of hydrocarbon mixtures. Aromatic hydrocarbons exhibit the lowest, and...
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