16 a the gas industry, caused the attention of inventors to be turned to the enrichment of coal gas.
One of the most generally adopted methods of enrichment now is by means of carburetted water gas mixed with poor coal gas.
The following analysis gives a fair idea of the composition of an average sample of gas made from coal, purified but without enrichment: Ioo 00 These constituents may be divided into - (a) light-yielding hydrocarbons, (b) combustible diluents and (c) impurities.
Very many attempts have been made to utilize tar for Enrich- the production and enrichment of gas, and to do this meat by two methods may be adopted: tar.
The final solution of the question of enrichment of gas by hydrocarbons derived from tar may be arrived at by a process which prevents the formation of part of the tar during the carbonization of the coal, or by the process devised by C. B.