Bleed-off elimination system and method

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant;

• (2) removing suspended solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing effective amounts of scale and corrosion inhibitors and microbiocides into the circulating aqueous coolant so as to maintain a concentration of from about 10 to about 1000 ppm. of scale inhibitors, of from about 10 to about 1000 ppm. of corrosion inhibitors, and of from about 10 to about 1000 ppm. of microbiocides.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant;

• (2) removing suspension solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing an effective amount of additive selected from the group consisting of scale inhibitors, corrosion inhibitors, microbiocides and mixtures thereof into the circulating aqueous coolant so that, by combination of steps (1), (2), (3) and (4) bleed-off from said system is reached to substantially zero.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant without the addition of substantial acid to reduce alkalinity;

• (2) removing suspended solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing an effective amount of additive selected from the group consisting of scale inhibitors, corrosion inhibitors, microbiocides, and mixtures thereof into the circulating aqueous coolant so that, by the combination of steps (1), (2), (3) and (4), the amount of the bleed-off from said system is at most 66% of the bleed-off necessary in the same system without such combination of steps.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant without the addition of substantial acid to reduce alkalinity;

• (2) removing suspended solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing effective amounts of scale and corrosion inhibitors and microbiocides into the circulating aqueous coolant so as to maintain a concentration of from about 10 to about 1000 ppm. of scale inhibitors, of from about 10 to about 1000 ppm. of corrosion inhibitors, and of from about 10 to about 1000 ppm. of microbiocides.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant without the addition of substantial acid to reduce alkalinity;

• (2) removing suspended solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing an effective amount of additive selected from the group consisting of scale inhibitors, corrosion inhibitors, microbiocides and mixtures thereof into the circulating aqueous coolant so that, by combination of steps (1), (2), (3) and (4), bleed-off from said system is reduced to substantially zero.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a cation exchange resin consisting essentially of a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant;

• (2) removing suspended solids from circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing an effective amount of additive selected from the group consisting of scale inhibitors, corrosion inhibitors, microbiocides, and mixtures thereof into the circulating aqueous coolant so that, by the combination of steps (1), (2), (3) and (4), the amount of the bleed-off from said system is at most 66% of the bleed-off necessary in the same system without such combination of steps.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a cation exchange resin consisting essentially of a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant;

• (2) removing suspended solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing effective amounts of scale and corrosion inhibitors and microbiocides into the circulating aqueous coolant so as to maintain a concentration of from about 10 to about 1000 ppm. of scale inhibitors, of from about 10 to about 1000 ppm. of corrosion inhibitors, and of from about 10 to about 1000 ppm. of microbiocides.

A process for reducing bleed-off in an open circulating heat exchange system having circulating aqueous coolant, said process comprising the steps of (1) treating all or a selected portion of the aqueous coolant with a cation exchange resin consisting essentially of a weak acid ion exchange resin to remove alkaline salts therefrom without removing salts of strong acids and to produce in situ carbonic acid from bicarbonate hardness in the aqueous coolant and thereby control the pH of the circulating aqueous coolant;

• (2) removing suspended solids from the circulating aqueous coolant;
• (3) removing carbon dioxide from the carbonic acid produced in the treating step;
• and (4) introducing an effective amount of additive selected from the group consisting of scale inhibitors, corrosion inhibitors, microbiocides and mixtures thereof into the circulating aqueous coolant so that, by combination of steps (1), (2), (3) and (4), bleed-off from said system is reduced to substantially zero.