20 



PRODUCTS FROM WASTE RESINOUS WOODS. 



acetate present. One molecule of silver iodid (234) equals one 

 molecule of methyl alcohol ( 32) . 



TABLE 5. Composition of pyroligneous add. 



The concentration of methyl acetate, methyl alcohol, and acetone 

 in the crude pyroligneous acid is much like that in the crude acid 

 from hardwood distillation, and is sufficiently great to make the 

 economical recovery of crude methyl alcohol feasible. The quantity 

 of acids in the crude acid is too small, however, to be economically 

 recovered. No comparison can be made between these yields of 

 acid and the yields obtained from resinous woods by the ordinary 

 methods ofMistillation. In these experiments the acetic acid formed 

 from the wood combined immediately with the alkali, and in the 

 subsequent distillation in the presence of an excess of soda was 

 probably destroyed. Though the concentration of the methyl 

 alcohol and acetone is high, the percentage yields from the wood 

 are low, agreeing very well with the quantities usually obtained 

 from resinous woods. 



OTHER EXPERIMENTS WITH THE BLACK LIQUOR. 



The black liquor was treated in several other ways. It was 

 saturated at room temperature with carbon dioxid; then, under a 

 pressure of 19 pounds, heated to 100 C., cooled and filtered. Filtra- 

 tion was slow when the mass became cold. The filtrate from the 

 carbon dioxid precipitate gave a precipitate with hydrochloric 

 acid. In a black liquor which contained 11.1 per cent of organic 

 matter in solution, carbon dioxid precipitated 4.9 per cent and acetic 

 acid precipitated 1.2 per cent from the filtrate. The carbon dioxid 

 precipitate was dried and dry distilled. It yielded approximately 

 51 per cent of distillate, 17 per cent of water, 12 per cent of heavy 

 oils, 11 per cent of light oils, and 6 per cent of creosote oils. The 

 acetic acid precipitate did not contain all of the rosin removed from 

 the wood by the alkali. 



