Abstract
The action of lime on coal tars, especially the vertical retort and producer gas tars, has beenstudied physicochemically. The reaction finds its use in the preparation of fuel briquette binders and road surfacing materials. Lime-treated and normal tars have been studied by means of the microscope, the ultramicroscope and the electron-microscope. Lime-treated tar has been distilled and the distillate and residue compared with those of the normal tar. The distillation residue from the limetreated tar was not pitch but a porous coke-like material. The X-ray diffraction patterns of the pitch and this coke-like residue have been compared. Finally, an attempt has been made to explain the increase in viscosity and binding power of a producer gas or vertical retort tar on treatment with lime on the basis of the experimental evidence.
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