20 96 conversion to distillate resulted in comparing this run with run no 1 it becomes evident that the aqueous ammonium sulfide addition to the resid and tetralin accelerated both the hydrogen donation and cracking reactions when tetralin and ammonium sulfide were reacted for 16 hours at 650 u00b0 f in a separate blank run not reported in the tables less than 2 of the tetralin was converted to naphthalene clearly the ammmonium sulfide was not reacting with the tetralin run no 3 was conducted under conditions similar to those of run no 1 using only resid and tetralin in an autoclave in this run however the reactants were heat soaked for 65 hours in a hydrogen sulfide atmosphere and 21 35 conversion of tetralin and 9 47 conversion of the 1050 u00b0 f fraction occurred these results reported in table 3 show less conversion achieved than that at 16 hours in run no 2 with the added aqueous ammonium sulfide run no 3 also illustrates that hydrogen sulfide does not effect great improvements in the conversion of tetralin or 1050 u00b0 f fraction under these mild conditions this demonstrates that the ammonium sulfide and not the hydrogen sulfide from.