Two-stage chemical mixing system
First Claim
1. A chemical mixing system for controlling a concentration of a chemical species in an admixture such that the concentration of the chemical species is maintained within a defined qualification range, said chemical mixing system comprising:
- (a) a mix vessel having an internal volume suitable for preparing a batch from ingredients comprising a diluent and a concentrated solution containing a relatively high concentration of the chemical species relative to the qualification range, wherein the mix vessel is adapted to receive the concentrated solution and the diluent from first and second supply sources, respectively;
(b) a mix drum having an internal volume for holding a supply of the admixture, wherein the internal volume of the mix drum is of a size sufficient for holding a plurality of batches prepared in the mix vessel, and wherein the mix drum is coupled to the mix vessel so that one or more batches prepared in the mix vessel can be transported to the internal volume of the mix drum in order to replenish the supply of, and controllably adjust the concentration of the chemical species in, the admixture; and
(c) a control system responsive to information comprising a measured concentration of the chemical species in the admixture, wherein said control system is capable of generating control signals for controlling the amounts of the concentrated solution and the diluent which are combined in the mix vessel when a batch is prepared so that the prepared batch comprises a corrective concentration of the chemical species relative to the measured concentration of the chemical species in the admixture.
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Accused Products
Abstract
A chemical mixing system for mixing ingredients at desired concentrations concentration within a qualification range. Batches of the mixed chemical are mixed in a relatively small mix vessel and transferred to a relatively large mix drum. The concentration of the chemical within the mix drum is measured by a concentration monitor. If the measured concentration of the chemical in the mix drum is within the qualification range, the batches of chemical in the mix vessel are mixed to the desired concentration. If the measured concentration of the chemical in the mix drum is below the qualification range, the batches of chemical in the mix vessel are mixed to a high concentration which is greater than the desired concentration. If the measured concentration of the chemical in the mix drum is above the qualification range, the batches of chemical in the mix vessel are mixed to a low concentration which is less than the desired concentration. Batch averaging is thereby performed to maintain the concentration of chemical in the mix drum within the desired qualification range.
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Citations
35 Claims
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1. A chemical mixing system for controlling a concentration of a chemical species in an admixture such that the concentration of the chemical species is maintained within a defined qualification range, said chemical mixing system comprising:
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(a) a mix vessel having an internal volume suitable for preparing a batch from ingredients comprising a diluent and a concentrated solution containing a relatively high concentration of the chemical species relative to the qualification range, wherein the mix vessel is adapted to receive the concentrated solution and the diluent from first and second supply sources, respectively; (b) a mix drum having an internal volume for holding a supply of the admixture, wherein the internal volume of the mix drum is of a size sufficient for holding a plurality of batches prepared in the mix vessel, and wherein the mix drum is coupled to the mix vessel so that one or more batches prepared in the mix vessel can be transported to the internal volume of the mix drum in order to replenish the supply of, and controllably adjust the concentration of the chemical species in, the admixture; and (c) a control system responsive to information comprising a measured concentration of the chemical species in the admixture, wherein said control system is capable of generating control signals for controlling the amounts of the concentrated solution and the diluent which are combined in the mix vessel when a batch is prepared so that the prepared batch comprises a corrective concentration of the chemical species relative to the measured concentration of the chemical species in the admixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 32)
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13. A process for controlling an amount of a chemical species in an admixture, comprising the steps of:
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(a) providing a supply of the admixture, wherein the admixture comprises a concentration of the chemical species; (b) measuring the concentration of the chemical species in the admixture; (c) determining if the measured concentration is within a defined qualification range; (d) preparing a batch comprising a corrective concentration of the chemical species relative to the measured concentration of the chemical species in the admixture, wherein the step of preparing the batch comprises the steps of; (i) providing ingredients comprising a concentrated solution and a diluent, wherein the concentrated solution contains a relatively high concentration of the chemical species relative to the qualification range; (ii) providing a mix vessel having an internal volume suitable for preparing the batch, wherein the mix vessel is adapted to receive the concentrated solution and the diluent from first and second supply sources, respectively, and wherein the system is provided with a plurality of sensors capable of generating sensor signals representative of the respective amounts of the concentrated solution and the diluent which are added to the internal volume of the mix vessel; and (iii) adding amounts of said ingredients to the mix vessel effective to provide the batch with the corrective concentration of the chemical species, wherein the amount of said ingredients added to the mix vessel is controlled in response to information comprising the sensor signals and to the measured concentration of the chemical species in the admixture; and (e) combining the batch with the admixture supply in order to controllably adjust the concentration of the chemical species in the admixture. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A process for controlling an amount of a chemical species in an admixture, comprising the steps of:
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(a) providing a supply of the admixture, wherein the admixture comprises a concentration of the chemical species; (b) measuring the concentration of the chemical species in the admixture; (c) determining if the measured concentration is within a defined qualification range; and (d) batchwise adjusting the concentration of the chemical species in the admixture in response to the measured concentration of the chemical species in the admixture, said batchwise adjusting step comprising the steps of; (i) providing a concentrated solution having a high concentration of the chemical species relative to the qualification range; (ii) providing a diluent; (iii) providing a control system responsive to information comprising the measured concentration of the chemical species in the admixture, wherein said control system is capable of generating control signals for controlling respective amounts of the concentrated solution and the diluent in order to provide a batch having a corrective concentration of the chemical species relative to the measured concentration of the chemical species in the admixture; and (iv) using information comprising the control signals to controllably dilute the concentrated solution with an amount of the diluent effective to provide said batch having a corrective concentration of the chemical species relative to the measured concentration of the chemical species in the admixture; and (v) combining the batch with the supply of the admixture. - View Dependent Claims (26, 27, 28, 29, 30, 31, 33, 34, 35)
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Specification