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Two-stage chemical mixing system

  • US 5,874,049 A
  • Filed: 01/23/1997
  • Issued: 02/23/1999
  • Est. Priority Date: 11/07/1995
  • Status: Expired due to Fees
First Claim
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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:

  • (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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