초록 ▼

The present invention relates to a cyclic continuous process and composition for the removal of NO and SO2 from a variety of fluid streams. A fluid stream containing NO and SO2 is contacted with an aqueous solution of water-soluble organic polymeric chelate containing a polyvalent metal, e.g., Fe (I

The present invention relates to a cyclic continuous process and composition for the removal of NO and SO2 from a variety of fluid streams. A fluid stream containing NO and SO2 is contacted with an aqueous solution of water-soluble organic polymeric chelate containing a polyvalent metal, e.g., Fe (II). The NO is catalytically absorbed and in the presence of SO2, the imidodisulfonate is formed. Optionally, a reducing agent, such as sodium hydrogen sulfide, is added to maintain the polyvalent metal in the reduced state. The process next includes removal of the imidodisulfonate formed. The separation of water and low molecular weight materials and products, e.g. molecular weight below 500, usually occurs by ultrafiltration or dialysis, with recycle and re-use of the polyvalent metal chelate.

대표청구항 ▼

A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO2, 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 eff

A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO2, 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: [Figure] (a) wherein X1 in each polymer unit is independently selected from －H or from a substituent R- selected from －CH2COOH, －CH2－CH2－COOH, －CH2－P(〓O)(OH)2, or [Figure] wherein R1 and R2 are each independently －CH3, －SO3H, Cl, －H, or －COOH and n is an integer between about 5 and 20,000; [Figure] (b) wherein X2 in each polymer unit is selected from －H or a substituent selected from －CH2CH(OH)CH2OH, －CH2CH(OH)CH2cl or [Figure] wherein R3, R4 and R5 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; [Figure] (c) wherein X3 in each polymer unit is independently selected from －OH, －Cl or a substituent: [Figure] wherein R3, R4 and R5 are as defined hereinabove; r is an integer between about 10 and 20,000 and s is an integer between about 1 and 4; [Figure] (d) wherein X4 in each polymer unit is independently selected from －OH, －OCH3, －OCH2CH3 or a substituent; [Figure] wherein R3, R4 and R5 are as defined hereinabove, t is an integer beteen about 10 and 20,000; and x is an integer between 1 and 4; [Figure] (e) wherein X5 in each polymer unit is independently selected from －OH or －Cl a substituent: [Figure] wherein R3, R4 and R5 are as defined hereinabove; y is an integer between about 10 and 20,000, and z is an integer between about 1 and 4; [Figure] (f) wherein X6 in each polymer unit is independently selected from CH2CH(OH)CH2OH, CH2CH(OH)CH2Cl, or [Figure] wherein v is betwen about 10 and 10,000, a is 6, b is 1 to 4, c is 1 to 4; and R3, R4 and R5 are as defined hereinabove; [Figure] (g) wherein X7 in each polymer unit is independently selected from －H or a substituent selected from CH2CH(OH)CH2OH, －CH2CH(OH)CH2Cl, or [Figure] wherein m is an integer from 1 to 4, q is between 10 and 10,000, q, R3, R4 and R5 are as defined hereinabove; [Figure] (h) wherein X8, and X9 and X10 in each polymer unit are each independently selected from －H or a substituent selected from －CH2CH(OH)CH2Cl, －CH2CH(OH)CH2OH, or [Figure] q, R3, R4 and R5 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, －OCH3, －OCH2CH3, －Cl, or －OH to substituent in each of X1, X2, X3, X4, X5, X6, X7, X8, X9, or X10 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).