Liquid composition sensor in scaling environment
First Claim
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1. A method of measuring a component in a kraft pulping liquor, that comprises the steps of:
- immersing a first electrode and a second electrode of a sensor device into a kraft pulping liquor being measured wherein the first electrode supplies a varying current and the second electrode receives the current and wherein the first electrode and the second electrode are neither shielded nor covered with a baffle;
providing a source of an aqueous mixture of organic polymeric scaling inhibitors; and
continuously distributing an effective amount of the aqueous mixture of organic polymeric scaling inhibitors into the kraft pulping liquor in the vicinity of the first and second electrodes as the sensor device measures at least one component that includes NaOH, Na2S, and/or Na2CO3 in the kraft pulping liquor and the sensor device generates signals corresponding to the amount or amounts of the at least one component measured wherein scale deposition on the first and second electrodes is reduced when current flows from the first electrode to the second electrode and the organic polymeric scaling inhibitors are in the vicinity of the first electrode and second electrode and wherein the organic polymeric scaling inhibitors are not applied directly onto the first and second electrodes.
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Abstract
Scale formation on the electrode(s) of a liquor sensor can be prevented by continuously delivering a water-soluble scale inhibitor or dispersant into the vicinity of the electrodes of a liquor sensor device. Scale inhibitors include, for instance, polymers that are derived from acrylic acid, maleic acid, acrylamide acid, phosphonate, and combinations thereof. An aqueous mixture of scaling inhibitor continuously delivered to the probe tip of the liquor sensor that was placed in a kraft pulping liquor allowed the sensor to operate accurately for over a month without having to be cleaned of scale.
10 Citations
22 Claims
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1. A method of measuring a component in a kraft pulping liquor, that comprises the steps of:
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immersing a first electrode and a second electrode of a sensor device into a kraft pulping liquor being measured wherein the first electrode supplies a varying current and the second electrode receives the current and wherein the first electrode and the second electrode are neither shielded nor covered with a baffle; providing a source of an aqueous mixture of organic polymeric scaling inhibitors; and continuously distributing an effective amount of the aqueous mixture of organic polymeric scaling inhibitors into the kraft pulping liquor in the vicinity of the first and second electrodes as the sensor device measures at least one component that includes NaOH, Na2S, and/or Na2CO3 in the kraft pulping liquor and the sensor device generates signals corresponding to the amount or amounts of the at least one component measured wherein scale deposition on the first and second electrodes is reduced when current flows from the first electrode to the second electrode and the organic polymeric scaling inhibitors are in the vicinity of the first electrode and second electrode and wherein the organic polymeric scaling inhibitors are not applied directly onto the first and second electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 21)
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12. A method of measuring alkali in kraft pulping liquor that comprises the steps of:
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(a) providing a multi-electrode sensor device having a plurality of electrodes that are positioned in the kraft pulping liquor; (b) operating the sensor device to measure an alkali component in the kraft pulping liquor wherein a varying current is supplied by a first electrode and the varying current is received by a second electrode and wherein the first electrode and the second electrode are neither shielded nor covered with a baffle; and (c) distributing an effective amount of an aqueous mixture of organic polymeric scaling inhibitors into the kraft pulping liquor in the vicinity of the first and second electrodes wherein the presence of the inhibitors does not interfere with measurement by the sensor device, characterized in that scale deposition on the first and second electrodes is reduced when current flows from the first electrode to the second electrode and the organic polymeric scaling inhibitors are in the vicinity of the first electrode and second electrode and wherein the organic polymeric scaling inhibitors are not applied directly onto the first and second electrodes. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 22)
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Specification