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Photometry of paper pulp suspension liquid colloid dissolving electric charge

A measurement method and suspension technology, applied in the field of measurement, can solve the problems of poor repeatability, difficulty, and lack of objectivity of test results

Inactive Publication Date: 2003-04-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0009] It can be seen that the original colloid titration method has the following defects: 1. It is to judge the titration end point by judging the color change of the charge indicator with the naked eyes of the people.
Therefore, it is difficult to judge the end point of titration by distinguishing such complex and gradual color changes with human eyes.
And because everyone has different sensitivity to changes in light wavelength and luminosity, this kind of titration end point analysis based on color judgment is not objective enough, and the repeatability of test results is poor

Method used

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  • Photometry of paper pulp suspension liquid colloid dissolving electric charge
  • Photometry of paper pulp suspension liquid colloid dissolving electric charge
  • Photometry of paper pulp suspension liquid colloid dissolving electric charge

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Embodiment Construction

[0020] The present invention tests the colloidal dissolved charge of the pulp suspension, so the fibrous and granular coarse substances in the sample should be removed before the test. When the concentration of the sample to be tested is high or the color is dark, in order to eliminate background interference, the sample should be diluted before the test, and the dilution factor should make the absorbance of the sample itself slightly lower than 0.2ABS.

[0021] The sample collection system mainly completes automatic sampling, the pretreatment unit filters, dilutes the sample, and adjusts the pH, ionic strength background, and the detection system includes a light source, a sample pool and photosensitive components. The result processing and display system filters and amplifies the electrical signal output by the photosensitive element, displays and outputs the measured value calculated by software, or provides it to the superior control system to assist in the adjustment of th...

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Abstract

The invented method includes following steps. (1) Diluting specimen makes the absorbency of the specimen under 0.2ABS. (2) Adding the charge indicator. (3) The specimen is titrated by using anionic polyelectrolyte with charge density known for ex. sulfate of polyvinyl alcohol or cationic polyelectrolyte. (4) Based on the change of the characteristic wavelength in the diluting process, the photometer is utilized to detect the charge indicator so as to determine the titration end for the soluble charge colloid. The invented method for determining the titration end is more scientific and accurate method than the method of determining the color change of the charge indicator with eyes.

Description

technical field [0001] The invention relates to a measurement technology, more specifically a photometric measurement method for the titration end point of the chemical parameter pulp suspension colloid dissolved charge in the wet end of papermaking. Background technique [0002] Papermaking wet-end chemistry is an emerging applied research field, which mainly studies the effect and influence of colloid chemistry and surface chemical phenomena in papermaking system on papermaking process. Therefore, the development of measurement methods and technologies for the chemical parameters of the wet end of papermaking is the basis for the chemical research of the wet end of papermaking. [0003] Pulp suspension contains a large amount of plant fibers, non-fiber additives, organic and inorganic colloids and dissolved substances, and is a relatively complex colloidal chemical system. The colloidal dissolved charge of the pulp suspension is one of the important parameters of the pape...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 何北海黄应刚钱丽颖阎东波肖萍孙广卫
Owner SOUTH CHINA UNIV OF TECH
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