EXTENDED DISTILLATION ANALYSIS OF ROAD TARS

LN 563 DESCRIBED WORK WHICH INDICATED THAT A VERTICAL RETORT TAR WAS THERMALLY DEGRADED WHEN DISTILLED TO 350 DEGREES C. THIS PRESENT NOTE PRESENT NOTE DESCRIBES FURTHER EXPERIMENTS TO DETERMINE' /1/ WHAT CHANGES OCCUR WHEN TARS FROM A WIDER RANGE OF CRUDES ARE DISTILLED TO 350 DEGREES C, /2/ THE TEMPERATURE AT WHICH ONSET OF DEGRADATION OCCURS WITH DIFFERENT TARS, /3/ THE POSSIBILITY OF RECOVERING BY DIRECT DISTILLATION FRACTIONS BOILING ABOVE 350 DEGREES C, /4/ IF SIMPLE MODIFICATION OF THE DISTILLATION METHOD COULD REDUCE THE EXTENT OF THERMAL DEGRADATION. DISTILLATION TESTS MADE OF SIX U.K. TARS SHOWED THAT SIMPLE EXTENSION OF DISTILLATION TEMPERATURE AT ATMOSPHERIC PRESSURE CANNOT BE USED FOR ALL TARS AS THERMAL DEGRADATION AFFECTS THE ANALYSIS OF LOW GRAVITY TARS. DISTILLATION UNDER REDUCED PRESSURE IS BEING DEVELOPED BUT AS AN INTERIM MEASURE THE S.T.P.T.C. METHOD WITH 400 G OF TAR FORMULATED ON LOW VOLATILITY PRINCIPLE, EXTENDED TO VAPOUR TEMPERATURE OF 350 DEGREES C IS RECOMMENDED' IT SHOULD BE SATISFACTORY FOR TARS WITH SPECIFIC GRAVITY ABOVE 1.20 FROM COKE OVENS. THE WORK IS PART OF A STUDY TO DETERMINE WHETHER THE DURABILITY OF ROAD TARS FOR OPEN-TEXTURED SURFACINGS CAN BE IMPROVED BY INCREASING THE PROPORTION OF NON VOLATILE PLASTICISING OILS. /RRL/

  • Supplemental Notes:
    • Vol Ln, No762, 13PP, 1FIG, 9TAB, 13REF
  • Corporate Authors:

    Road Research Laboratory /UK

    ,    
  • Authors:
    • Tingle, E D
    • GREEN, E H
    • Codling, P J
  • Publication Date: 1965-2

Subject/Index Terms

Filing Info

  • Accession Number: 00210515
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS, ATRI
  • Created Date: Jan 20 1994 12:00AM