Process for the removal of NO from fluid streams using a water soluble polymeric chelate of a polyvalent metal

Claim 2

A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO 2 , which process comprises: (A) contacting the fluid stream in a contacting zone with an aqueous reaction solution at a temperature between 10° and 90° C., the reaction solution itself comprising an effective amount of an organic water-soluble polymeric chelate containing a polyvalent metal and a backbone repeating polymer chain having pendant organic chemical group effective to chelate the metal present and to absorb the NO present, wherein the polymeric chelate has a molecular weight of between about 500 and 1,000,000; and (B) separating the gas stream and the resulting aqueous phase produced in step (A) containing the polymeric chelate and imidodisulfonate; (C) separating and purifying the aqueous solution produced in Step (B) by membrane separation means effective to remove a portion of the water and other reaction products having a molecular weight of less than 500; and (D) recycling the concentrated aqueous solution containing the water soluble polymeric chelate of step (C) to the contacting zone of step (A).

Claim 3

The process of claim 1 wherein in step (C) a portion of the aqueous solution is separated from the polymeric chelate by separation means selected from ultrafiltration or dialysis.

Claim 4

The process of claim 2 wherein the means is ultrafiltration.

Claim 5

The process of claim 1 wherein in step (A) the polyvalent metal is iron.

Claim 6

The process of claim 3 wherein in step (A) the polyvalent metal is iron.

Claim 7

The process of claim 2 wherein the polyvalent metal is iron.

Claim 8

A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO 2 , which process comprises: (A) contacting the fluid stream in a contacting zone with an aqueous reaction solution at a temperature of between about 10° and 90° C., the reaction solution itself comprising an effective amount of a water-soluble organic polymeric chelate, containing a polyvalent metal effective to absorb the NO present, wherein the polymeric chelate has a molecular weight of between about 500 and 1,000,000 and pendant chelating groups are selected from chelates of the formula: ##STR24## wherein X 1 in each polymer unit is independently selected from --H or from a substituent R- selected from --CH 2 COOH, --CH 2 --CH 2 --COOH, --CH 2 --P(═O)(OH) 2 , or ##STR25## wherein R 1 and R 2 are each independently --CH 3 , --SO 3 H, Cl, --H, or --COOH and n is an integer between about 5 and 20,000; ##STR26## wherein X 2 in each polymer unit is selected from --H or a substituent selected from --CH 2 CH(OH)CH 2 OH, --CH 2 CH(OH)CH 2 cl or ##STR27## wherein R 3 , R 4 and R 5 are each independently selected from R as defined hereinabove, p is an integer between about 5 and 20,000; and q is an integer selected from 0, 1, 2, 3 or 4; ##STR28## wherein X 3 in each polymer unit is independently selected from --OH, --Cl or a substituent: ##STR29## wherein R 3 , R 4 and R 5 are as defined hereinabove; r is an integer between about 10 and 20,000 and s is an integer between about 1 and 4; ##STR30## wherein X 4 in each polymer unit is independently selected from --OH, --OCH 3 , --OCH 2 CH 3 or a substituent; ##STR31## wherein R 3 , R 4 and R 5 are as defined hereinabove, t is an integer beteen about 10 and 20,000; and x is an integer between 1 and 4; ##STR32## wherein X 5 in each polymer unit is independently selected from --OH or --Cl a substituent: ##STR33## wherein R 3 , R 4 and R 5 are as defined hereinabove; y is an integer between about 10 and 20,000, and z is an integer between about 1 and 4; ##STR34## wherein X 6 in each polymer unit is independently selected from CH 2 CH(OH)CH 2 OH, CH 2 CH(OH)CH 2 Cl, or ##STR35## wherein v is betwen about 10 and 10,000, a is 6, b is 1 to 4, c is 1 to 4; and R 3 , R 4 and R 5 are as defined hereinabove; ##STR36## wherein X 7 in each polymer unit is independently selected from --H or a substituent selected from CH 2 CH(OH)CH 2 OH, --CH 2 CH(OH)CH 2 Cl, or ##STR37## wherein m is an integer from 1 to 4, q is between 10 and 10,000, q, R 3 , R 4 and R 5 are as defined hereinabove; ##STR38## wherein X 8 , and X 9 and X 10 in each polymer unit are each independently selected from --H or a substituent selected from --CH 2 CH(OH)CH 2 Cl, --CH 2 CH(OH)CH 2 OH, or ##STR39## q, R 3 , R 4 and R 5 are as defined hereinabove, w is between about 10 and 10,000; or (i) mixtures of polymeric chelates (a) to (h), with the proviso that the overall ratio of --H, --OCH 3 , --OCH 2 CH 3 , --Cl, or --OH to substituent in each of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , or X 10 in each polymeric chelant (a to h) hereinabove is between about 10/90 and 90/10; (B) separating the fluid stream and the resulting aqueous phase containing the polymeric chelate.iron (II) and imidodisulfonate of step (A); (C) concentrating the aqueous phase repeated in step (B) by membrane means effective to remove a portion of the water and other monomeric reaction products having a molecular weight below 500 and; (D) recycling the concentrated aqueous solution containing the water-soluble polymeric chelate produced in Step (C) to the contacting zone of step (A).

Claim 9

A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO 2 , which process comprises: (A) contacting the fluid stream in a contacting zone with an aqueous reaction solution at a temperature of between about 10° and 90° C., the reaction solution itself comprising an effective amount of a water-soluble organic polymeric chelate, containing a polyvalent metal effective to absorb the NO present, wherein the polymeric chelate has a molecular weight of between about 500 and 1,000,000 and pendant chelating groups are selected from chelates of the formula: ##STR24## wherein X 1 in each polymer unit is independently selected from --H or from a substituent R- selected from --CH 2 COOH, --CH 2 --CH 2 --COOH, --CH 2 --P(═O)(OH) 2 , or ##STR25## wherein R 1 and R 2 are each independently --CH 3 , --SO 3 H, Cl, --H, or --COOH and n is an integer between about 5 and 20,000; ##STR26## wherein X 2 in each polymer unit is selected from --H or a substituent selected from --CH 2 CH(OH)CH 2 OH, --CH 2 CH(OH)CH 2 cl or ##STR27## wherein R 3 , R 4 and R 5 are each independently selected from R as defined hereinabove, p is an integer between about 5 and 20,000; and q is an integer selected from 0, 1, 2, 3 or 4; ##STR28## wherein X 3 in each polymer unit is independently selected from --OH, --Cl or a substituent: ##STR29## wherein R 3 , R 4 and R 5 are as defined hereinabove; r is an integer between about 10 and 20,000 and s is an integer between about 1 and 4; ##STR30## wherein X 4 in each polymer unit is independently selected from --OH, --OCH 3 , --OCH 2 CH 3 or a substituent; ##STR31## wherein R 3 , R 4 and R 5 are as defined hereinabove, t is an integer beteen about 10 and 20,000; and x is an integer between 1 and 4; ##STR32## wherein X 5 in each polymer unit is independently selected from --OH or --Cl a substituent: ##STR33## wherein R 3 , R 4 and R 5 are as defined hereinabove; y is an integer between about 10 and 20,000, and z is an integer between about 1 and 4; ##STR34## wherein X 6 in each polymer unit is independently selected from CH 2 CH(OH)CH 2 OH, CH 2 CH(OH)CH 2 Cl, or ##STR35## wherein v is betwen about 10 and 10,000, a is 6, b is 1 to 4, c is 1 to 4; and R 3 , R 4 and R 5 are as defined hereinabove; ##STR36## wherein X 7 in each polymer unit is independently selected from --H or a substituent selected from CH 2 CH(OH)CH 2 OH, --CH 2 CH(OH)CH 2 Cl, or ##STR37## wherein m is an integer from 1 to 4, q is between 10 and 10,000, q, R 3 , R 4 and R 5 are as defined hereinabove; ##STR38## wherein X 8 , and X 9 and X 10 in each polymer unit are each independently selected from --H or a substituent selected from --CH 2 CH(OH)CH 2 Cl, --CH 2 CH(OH)CH 2 OH, or ##STR39## q, R 3 , R 4 and R 5 are as defined hereinabove, w is between about 10 and 10,000; or (i) mixtures of polymeric chelates (a) to (h), with the proviso that the overall ratio of --H, --OCH 3 , --OCH 2 CH 3 , --Cl, or --OH to substituent in each of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , or X 10 in each polymeric chelant (a to h) hereinabove is between about 10/90 and 90/10; (B) separating the fluid stream and the resulting aqueous phase containing the polymeric chelate.iron (II) and imidodisulfonate of step (A); (C) concentrating the aqueous phase repeated in step (B) by membrane means effective to remove a portion of the water and other monomeric reaction products having a molecular weight below 500 and; (D) recycling the concentrated aqueous solution containing the water-soluble polymeric chelate produced in Step (C) to the contacting zone of step (A).

Claim 10

The process of claim 7 wherein in step (C) a portion of the aqueous solution is separated from the polymeric chelate by means selected from ultrafiltration and dialysis.

Claim 11

The process of claim 8 wherein the means for removal in step (C) is ultrafiltration.

Claim 12

The process of claim 8 wherein in step (A) the polymeric chelate has a molecular weight of between about 1,000 and 500,000.

Claim 13

The process of claim 8 wherein in step (A) the metal is iron.

Claim 14

The process of claim 7 wherein the water-soluble chelate has the formula of chelate (C): ##STR40## wherein r is between about 15 and 20.

Claim 15

The process of claim 12 wherein the organic water-soluble chelate has a molecular weight of between about 1,000 and 500,000.

Claim 16

The process of claim 12 wherein the polyvalent metal is iron.

Claim 17

The process of claim 12 wherein the concentration of the aqueous solution in step (C) is performed by means which is ultrafiltration.