Method of improving sulfite antioxidant performance in high solids scrubbers

Claim 3

The method as defined in claim 1 wherein said water soluble antioxidant additive comprises a member selected from the group consisting of aromatic amines, and linear polyethyleneamines and mixtures thereof.

Claim 4

The method as defined in claim 1 further comprising adding about 1-100 parts of said topping agent to said aqueous scrubber medium, based upon 1 million parts of said medium, and adding about 0.5-10 parts of said water soluble antioxidant additive to said medium, based upon 1 million parts of said medium.

Claim 5

The method as defined in claim 1 wherein said topping agent is added to said aqueous scrubber medium at a point prior to and sufficiently removed from the point wherein said water soluble antioxidant additive is added to said medium.

Claim 6

The method as defined in claim 1 wherein said topping agent and said water soluble antioxidant additive are added simultaneously and at the same point to said medium.

Claim 7

The method as defined in claim 1 wherein said polyphosphate compound is a member selected from the group consisting of: Na 5 P 3 O 10 sodium tripolyphosphate Na 4 P 2 O 7 tetrasodium pyrophosphate Na 2 H 2 P 2 O 7 disodium pyrophosphate (NaPO 3 ) 6 sodium hexametaphosphate K 4 P 2 O 7 tetrapotassium pyrophosphate Na 2 (NH 4 ) 2 P 2 O 7 sodium ammonium pyrophosphate Na 4 HP 3 O 10 .1.5H 2 O sodium acid tripolyphosphate K 5 P 3 O 10 potassium tripolyphosphate Na 6 P 4 O 13 sodium tetrapolyphosphate Na 3 P 3 O 9 sodium trimetaphosphate Na 4 P 4 O 12 sodium tetrametaphosphate (NaPO 3 ) 7 sodium heptametaphosphate (NaPO 3 ) 8 sodium octametaphosphate and mixtures thereof.

Claim 8

The method as defined in claim 1 wherein said organo-phosphonic acid compound comprises a moiety represented by the formula: ##STR17## wherein R=lower alkyl having from 1 to about 6 carbon atoms, OH or NH 2 substituted alkyl, a mononuclear aromatic radical, or an hydroxy, amino or lower alkyl substituted aromatic, and M=a water soluble cation.

Claim 9

The method as defined in claim 1 wherein said organo-phosphonic acid compound comprises a moiety represented by the formula: ##STR18## wherein R 1 =an alkylene having from about 1 to about 12 carbon atoms, or a hydroxy or amino substituted alkylene having about 1 to about 12 carbon atoms, and M=a water soluble cation.

Claim 10

The method as defined in claim 1 wherein said organo-phosphonic acid compound comprises a moiety represented by the formula: ##STR19## wherein R 2 =lower alkylene having from about 1 to about 4 carbon atoms, or an amine or hydroxy substituted lower alkylene having from about 1 to about 4 carbon atoms, R 3 =[R 2 -PO 3 M 2 ], H, OH, amino, substituted amino, an alkyl having from about 1 to about 6 carbon atoms, an hydroxy or amino substituted alkyl having from about 1 to about 6 carbon atoms, a mononuclear aromatic radical, or an hydroxy or amino substituted mononuclear aromatic radical, R 4 =R 3 or ##STR20## R 5 and R 6 =H, lower alkyl having from about 1 to 6 carbon atoms, an hydroxy or amino substituted lower alkyl, H, OH, amino, substituted amino, a mononuclear aromatic radical, or an hydroxy or amine substituted mononuclear aromatic radical, R 7 =R 5 , R 6 or R 2 -PO 3 M 2 wherein R 2 is as above described in this claim, n=a number of from 1 through about 15, y=a number of from about 1 through about 14, and M=a water soluble cation.

Claim 13

The method as recited in claim 10 wherein said water soluble antioxidant additive comprises a polyethyleneamine having the formula NH.sub.2 (CH.sub.2 CH.sub.2 NH).sub.X H wherein X>1.

Claim 14

The method as recited in claim 11 wherein X is about 2 to about 10.

Claim 15

The method as recited in claim 10 wherein said water soluble antioxidant additive comprises an aromatic amine having the formula: ##STR21## wherein R 1 =OH, NHR 5 , lower alkyl having 1-3 carbon atoms, or, ##STR22## R 2 =H, or OH with the proviso that R 1 =OH when R 2 =OH, R 3 =H, or lower alkyl having 1 to 3 carbon atoms, R 4 =H or NHR 5 , R 5 =H, or lower alkyl having 1 to 3 carbon atoms.

Claim 16

The method as recited in claim 12 wherein said linear polyethyleneamine is tetraethylenepentamine.

Claim 17

The method as recited in claim 12 wherein said linear polyethyleneamine is diethylenetriamine.

Claim 18

The method as recited in claim 12 wherein said linear polyethyleneamine is pentaethylenehexamine.

Claim 19

The method as defined in claim 13, wherein said aromatic amine is N,N dimethyl-p-phenylene diamine sulfate.

Claim 20

The method as defined in claim 13 wherein said aromatic amine is N,N' di-sec-butyl-p-phenylene diamine.

Claim 21

The method as defined in claim 13 wherein said aromatic amine is N,N' di-isopropyl-p-phenylene diamine.

Claim 22

Method as recited in claim 1 or 10, wherein said solids particulate matter comprises fly ash.