THE SURFACE TENSION RULE FOR ASPHALTIC BITUMEN

PREVIOUS STUDIES (CHEMICAL ABSTRACTS, VOL. 21, 3738, 1927), INDICATED THAT LIQUIDS OF LOW SURFACE TENSION FLOCCULATE ASPHALT SOLUTIONS WHILE THOSE WITH HIGH SURFACE TENSION ARE PEPTIZING AGENTS. A REVISED LIST IS GIVEN OF LIQUIDS ARRANGED IN ORDER OF INCREASING SURFACE TENSION, CLASSIFIED AS FLOCCULATING AGENTS, INTERMEDIATE ZONE, AND PEPTIZING AGENTS (SOLVENTS). THE PERCENTAGE OF PRECIPITATION WITH ONE ASPHALTIC BITUMEN IS GIVEN FOR THE FLOCCULATING AGENTS. THE AMOUNT OF PRECIPITATE FOR ONE ASPHALTIC BITUMEN HAS BEEN PLOTTED AGAINST SURFACE TENSIONS, BUT MANY OF THE LIQUIDS FALL CONSIDERABLY ABOVE OR BELOW A STRAIGHT LINE DRAWN THROUGH THESE VALUES. IN CONTRAST, THE AMOUNT OF PRECIPITATE FROM A COAL TAR CAN BE CALCULATED FROM THE SURFACE TENSION OF THE LIQUID AND A SPECIAL VALUE FOR EACH TAR (DURIEZ, CHEMICAL ABSTRACTS, VOL. 34, 3475, 1940). MANY, BUT NOT ALL, AMINES PROVED TO BE MISCIBLE WITH THE OILY MEDIUM AND THE PROTECTIVE BODIES OF ASPHALTIC BITUMEN. INTRODUCTION OF THE AMINE GROUP INTO HYDRO-CARBONS GENERALLY INCREASES THE MISCIBILITY, BUT THE AROMATIC AMINES, ANILINE, AND TOLUDINE ARE PRACTICALLY NOT MISCIBLE, WHILE BENZENE AND TOLUENE ARE GOOD SOLVENTS FOR ASPHALTIC BITUMEN. ALL THE HALOGENS FAVOR MISCIBILITY. OXYGEN, ESPECIALLY THE -0H AND =0 GROUPS, DECREASES THE MISCIBILITY, BUT ITS INFLUENCE MAY BE COUNTERBALANCED BY A GREAT NUMBER OF THE ETHYLENE GROUP. THE FAVORABLE INFLUENCE OF THE BENZENE AND THE HEXAHYDROBENZENE RADICALS ON THE MISCIBILITY MAY BE PARTLY DUE TO THE PRESENCE OF SIX CH OR ETHYLENE GROUPS, RATHER THAN TO THE RING STRUCTURE ITSELF. CYCLOHEXANE IS A GOOD SOLVENT AND HEXANE IS A GOOD FLOCCULANT. A WIDE VARIETY OF AROMATIC COMPOUNDS ARE GOOD SOLVENTS, BUT MANY ALIPHATIC AND A FEW INORGANIC COMPOUNDS ARE ALSO PEPTIZING AGENTS.

  • Supplemental Notes:
    • Vol 35, pp 302-305
  • Corporate Authors:

    Institute of Petroleum

    61 New Cavendish Street
    London W1M 8AR,   England 
  • Authors:
    • Nellensteyn, F J
    • Bart, M
  • Publication Date: 1949

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  • Accession Number: 00210913
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: May 13 2003 12:00AM