TAR AND ITS TREATMENT

LES GOUDRONS ET LEUR TRAITEMENT

This paper was presented to the Conference on Bituminous Binders and Materials, Paris, 3 March 1977. At the present time, only coal tars derived from the combustion of fat coal at about 1200 deg C exist in France, and their production reached 45000 t/yr. In 1970, world production has risen to 16 million tonnes. Tar is fractionated using the normal technique of vacuum distillation or by introduction of steam and expansion. At the base of the column, pitch is collected, cooling at 70-80 deg C, and this represents about 50% of the initial raw tar. The pitch is used for caking oil filler, the manufacture of road binders-representing 20% of the raw tar - the manufacture of pitch for electrodes as well as for paints. From bottom to the top of the distillation column are collected successively - base oil distilling between 420 and 480 deg C; chrysene oil distilling between 360 and 420 deg C, used in manufacturing road binders and as a base for carbon black; - anthracene oil between 300 and 350 deg C giving the anthraquinone base to synthetic colorants; - acenapthene oil between 235 and 300 deg C; - phenolic oil between 160 and 200 deg C (containing principally phenols as well as pyridic bases - picolene pyridines - and indene. After extraction of phenols and pyridic bases, this oil is used as flux oil for bituminous binders); - light oil at 80-140 deg C. /TRRL/

  • Corporate Authors:

    Revue Generale des Routes

    9 rue Magellon
    Paris,   France 
  • Authors:
    • Rofidal, S
  • Publication Date: 1977-11

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00302884
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1979 12:00AM