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Method to monitor and control chemical treatment of petroleum, petrochemical and processes with on-line quartz crystal microbalance sensors

  • US 5,734,098 A
  • Filed: 03/25/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 03/25/1996
  • Status: Expired due to Term
First Claim
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1. A method for the rapid determination of a scaling, corrosion or biological growth condition occurring on a surface in contact with an industrial water contained in an industrial water system, and for taking steps to correct such condition which comprises the steps of:

  • a. inserting a thickness-shear mode resonator device into the industrial water whereby the quartz surface of the thickness-shear mode resonator device is in contact with the industrial water;

    b. continuously exciting the thickness-shear mode resonator device and measuring the output of the thickness-shear mode resonator device as the mass and viscosity-density components of the industrial water in contact with the thickness-shear mode resonator device;

    c. continuously determining the condition of the industrial water contacting the quartz surface of the thickness-shear mode resonator device based on the mass and viscosity-density components of said industrial water; and

    then,d. continuously correcting the condition of said industrial water in contact with the quartz surface of the thickness-shear mode resonator device by taking an action from the group consisting of;

    i. activating or deactivating a chemical feed pump applying a condition correcting chemical to the industrial water;

    ii. increasing the flow of water out of the system;

    or,iii. decreasing the flow of water out of the system.

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