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Method and apparatus for measuring calcium oxalate scaling

A technology of calcium oxalate and scaling, which is applied in measuring devices, testing water, testing food, etc. It can solve the problems of inapplicable test calcium oxalate solution and unable to provide the necessary conditions for calcium oxalate crystals

Inactive Publication Date: 2003-09-17
NALCO CHEM CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] However, as described here, the piezoelectric microbalance described in the above reference is not suitable for testing calcium oxalate solutions because it does not provide the necessary conditions for deposition of calcium oxalate crystals on the surface of the microbalance

Method used

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  • Method and apparatus for measuring calcium oxalate scaling
  • Method and apparatus for measuring calcium oxalate scaling
  • Method and apparatus for measuring calcium oxalate scaling

Examples

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example 1

[0095] The following describes the use of the method and apparatus of the present invention to measure the effectiveness of calcium oxalate scale inhibitors in a Kraft pulp bleaching plant. The following description is only one application of the present invention and is not limiting.

[0096] Pulp produced by the Kraft process is usually bleached in a multi-stage sequence to obtain the desired gloss and strength. The main purpose of pulp bleaching is to increase the gloss of the pulp and make it suitable for printing paper and tissue grade paper by removing or reforming the lignin and poor quality products of unbleached pulp. Bleaching of chemical pulp is accomplished through a series of treatments including chlorine dioxide, aggressive hydrogen peroxide and other bleaching agents. The bleaching of chemical pulp usually begins with the use of chlorine dioxide in the first stage. Pulp bleaching is carried out through the chemical reaction of the bleaching agent with the ligni...

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Abstract

The invention relates to an apparatus for measuring the calcium oxalate scale forming propensity of a continuously flowing solution having a pH of from 2 to 3 which comprises a quartz crystal microbalance having a top side comprising a working electrode for exposure to the solution and a bottom side isolated from the solution, wherein the working electrode is coated with or made of a conductive material on which the intensive evolution of hydrogen gas proceeds at potentials more negative than necessary to achieve a pH of 3.5-9 proximate to the microbalance.

Description

technical field [0001] The present invention relates to a method and apparatus for measuring the tendency of calcium oxalate scale formation in fluids, and the effectiveness of calcium oxalate scale inhibitors. More specifically, the present invention relates to a method of deposition rate of calcium oxalate scale on the surface of a piezoelectric microbalance immersed in a fluid. In the microbalance, the deposition of scale is influenced by an electrochemically controlled pH change in the vicinity of the microbalance. Background technique [0002] Calcium oxalate scaling is a long-standing problem in various industrial processes involving water, such as pulp bleaching and sugar refining processes. Calcium oxalate scale can be suspended in water or form hard deposits that accumulate on the surface of any material that comes into contact with water. This buildup can prevent effective heat transfer, impede fluid flow, cause corrosion and harbor bacteria. [0003] The main de...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N5/02G01N27/00G01N27/42G01N29/02G01N29/22G01N29/30G01N33/02G01N33/18
CPCG01N29/022G01N29/222G01N29/30G01N33/1853G01N2291/0256G01N2291/0426
Inventor S·M·舍甫琴柯D·L·库茨涅索夫P·Y·迪金瑞拉
Owner NALCO CHEM CO
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