Apr. 2, 2015  11  US 2015/0093314 Al  said first sterically hindered amine to said second sterically  hindered amine that is in the range of from 2.5:1 to 8:1.  12.  An absorbent composition as recited in claim  11,  wherein said aqueous solvent is present in said absorbent  composition in an amount in the range of from 85 wt. % to  97 .5 wt. %, wherein said average molecular weight of said  PEG mixture is in the range of from 180 to 400, and wherein  said organic co-solvent present in said absorbent composition  is in an amount in the range of from 2.5 wt.% to 15 wt.%.  13.  A process for the selective removal of hydrogen sulfide  from a gas stream, comprising H$_{2}$S and CO$_{2}$ , wherein said  process comprises:  14.  A process as recited in claim  13,  wherein said strong  acid is selected from the group of acids consisting of perchlo› ric acid (HC1O$_{4}$ ),  hydroiodic acid (HI), hydrobromic acid  (HBr), hydrochloric acid (HCl), sulfuric acid (H$_{2}$ SO$_{4}$ ), and  nitric acid (HNO$_{3}$ ).  15.A  process as recited in claim  14,  wherein said absorbent  composition further comprises an organic co-solvent selected  from the group consisting of sulfones, sulfone derivatives,  and sulfoxides.  16.  A process as recited in claim  15,  wherein said organic  co-solvent is present in said absorbent composition in an  amount upwardly to about 10 wt.% of the total weight of said  absorbent composition.  17.  A process as recited in claim  16,  wherein said aqueous  solvent is present in said absorbent composition in an amount  in the range of from 85 wt. % to 98.5 wt. %; wherein said  strong acid is present in said absorbent composition in an  amount in the range of from 1.5 wt.% to 5 wt.%; and wherein  said organic co-solvent is present in said absorbent composi› tion in an amount in the range of from about 1 wt. % to about  8 wt.%.  18.  A process as recited in claim  17,  wherein said amina› tion reaction product further comprises at least a first steri› cally hindered amine and a second sterically hindered amine.  19.  A process as recited in claim  18,  wherein said strong  acid is sulfuric acid.  20.  A process as recited in claim  19,  wherein said PEG  mixture comprises polyethylene glycols of the formula  HOCHiCH$_{2}$OCH$_{2}$)nCH$_{2}$OH, wherein n is an integer  selected from values in the range of from 1 to 24.  21.  A process as recited in claim  20,  wherein said first  sterically hindered amine is selected from the group of amine  compounds of the formula:  22.  A process as recited in claim  21,  wherein said amina› tion reaction product has a weight ratio of said first sterically  hindered amine to said second sterically hindered amine that  is in the range upwardly to 10: 1.  23.  A process as recited in claim  22,  wherein said amina› tion reaction product has a weight ratio of said first sterically  hindered amine to said second sterically hindered amine that  is in the range of from 2.5: 1 to 8: 1.  24.  A process as recited in claim  23,  wherein said aqueous  solvent is present in said absorbent composition in an amount  in the range of from 85 wt.% to 97.5 wt.%, wherein said  average molecular weight of said PEG mixture is in the range  of from 180 to 400, and wherein said organic co-solvent  present in said absorbent composition is in an amount in the  range of from 2.5 wt.% to 15 wt.%.  *  *  *  *  *  contacting said gas stream with an absorbent composition  under selective absorption conditions for the removal of  H$_{2}$S from said gas stream, wherein said absorbent com› position comprises (a) from 75 wt. % to 98.5 wt. %,  based on the total weight of said absorbent composition,  of an aqueous solvent; and (b) upwardly to 5 wt. %,  based on the total weight of said absorbent composition,  of a strong acid, wherein said aqueous solvent comprises  from 20 wt. % to 70 wt. %, based on the total weight of  said aqueous solvent, of an amination reaction product  of a polydispersed polyethylene glycol (PEG) mixture  having an average molecular weight that is in the range  of from 180to l000andt-butylamine, andfrom30wt. %  to 80 wt. % water, based on the total weight of said  aqueous solvent; and  yielding a treated gas stream having a reduced concentra› tion ofH$_{2}$S.  (CH$_{3}$ ) $_{3}$CNH(CH$_{2}$CH$_{2}$O)xCH$_{2}$CH$_{2}$NHC(CH$_{3}$ ) 3 ,  whereinx  is an integer in the range of from 2 to 16; and  wherein said second sterically hindered amine is selected  from the group of amine compounds having the follow› ing formula:  (CH$_{3}$ ) $_{3}$CNH(CH$_{2}$CH$_{2}$O)xCH$_{2}$CH$_{2}$OH, wherein x is an  integer in the range of from 2 to 16. 