Some problems and suggestions relating to coal tar

✍ Scribed by Chadder, W. J. ;Spiers, H. M.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1930
• Weight: 826 KB
• Volume: 49
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000494203

✦ Synopsis

Thc effect which tiir lins on tlic balance-shcct of n gas undertaking is sufficiontly great to justify thc dcvotion of careful thouglit to tlic siibjcct. A fluctuiition of. ld. per gnllon in tlic sclling pricc of tlic tar is cquivalent to a fluctuation of rntlicr less than Id. in the cost of production of 1000 cb. ft. of gns. In spitc of its vnluc from tlic point of view of rcvcnuc, tar is too oftcii lookcd upon as n nuisaucc, and receives but little attention. Ncglcct, howcvcr, mcrcly incrcnscs tlic nuis:incc ant1 prcvcnts tlic rculisntion of tlic mnsimiim rctiirii wliicli ciin be o1)taiiicd froin this important by-product. Crude tar is n product wry difficiilt to sell csccpt undcr contmct. Rcfinecl tnrs, howcvcr, find a rciicly mtirkct.

I)IFFEItESCIk3 IS THE NATURE OF TAR

Con1 tiir is wry variable in its n:iturc nnd composition. The major variations nrc due to differences in the cnrbonising conditions, and thcrc is ii decided trcnd in tlic various properties in tlic sequcncc horizontnl retort tar, colic-oven tar, intermittent chamlm tar, vertical retort tar, and low-tcmpcrnturc tar. 'I'lic trcnd may liest bc illustmteil by rcfcrcncc to two wry cstrcnic cnscs. Properlies of two ic*idelg dij/ernll fur8 Jloriroiitnl retort tar, tcinpcrcrturc. tur lightly fillcd rclorls high curboiiiuiiig Low-tciiipcruturc