A Method for Accurately Determining Calcium Carbonate Content in Paper by Headspace Gas Chromatography
A headspace gas chromatography and accurate measurement technology is applied in the detection field of paper fillers, which can solve the problems of low time-consuming efficiency, complicated operation and high cost, and achieve the effects of simple operation, improved accuracy and overcoming large errors.
Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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It can be seen that these two methods are complicated to operate, time-consuming, inefficient, and costly.
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[0035] The present invention will be described in further detail below in conjunction with specific embodiments.
[0036] The present invention uses the pressure effect of the headspace to detect the calcium carbonate content in the paper, such as figure 1 shown. The specific principle is: when the concentration of carbon dioxide generated in the headspace bottle is low, the concentration of carbonate in the solution has a linear relationship with the signal value of carbon dioxide, but when the concentration of carbonate in the solution is too high, the concentration of carbonate and carbon dioxide The signal value of is a nonlinear relationship; at the same time, when the concentration of carbonate in the solution changes within a certain concentration range, the signal value of oxygen in the gas phase of the headspace bottle is constant, and when the concentration of carbonate in the solution exceeds an inflection point After that, the concentration of carbonate has a good...
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The invention discloses a method for accurately measuring the content of calcium carbonate in paper by the aid of headspace gas chromatography processes. The calcium carbonate in paper samples is converted into CO2 by means of acidifying, and then oxygen and carbon dioxide signal values in headspaces are measured by gas chromatography. The accuracy of existing methods can be affected by the pressures of high-concentration CO2 when the content of the calcium carbonate in the samples is excessively high, meanwhile, O2 signals in gas phases of the headspaces can be changed by the pressures, and the change of the O2 signals can be detected, so that the content of the calcium carbonate in the paper can be indirectly measured. The method has the advantages that the content of the calcium carbonate can be quickly measured by the aid of the method, results are objective and accurate, the method is easy and convenient to implement and applicable to accurately measuring the content of the calcium carbonate in the paper by the aid of the headspace gas chromatography processes under actual production conditions of factories and in laboratories, and the shortcomings of existing methods for detecting the content of calcium carbonate in paper can be overcome.
Description
technical field [0001] The invention relates to the technical field of detection of paper fillers, in particular to a method for accurately determining calcium carbonate content in paper by headspace gas chromatography. Background technique [0002] Calcium carbonate is an important filler widely used in the paper industry. Adding a certain amount of calcium carbonate to the paper can not only improve the physical properties of the paper, such as whiteness, opacity and smoothness, but also help to improve the printing quality of the paper. Compared with other papermaking fillers (such as talc, kaolin and titanium dioxide), calcium carbonate can make paper have better air permeability and burning rate, and these special properties have a very important impact on some specialty papers, such as cigarette paper. In addition, since the price of calcium carbonate is relatively low, and adding more CaCO3 in papermaking can also minimize the use of cellulose fibers, thereby reducin...
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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/025
Inventor 戴毅刘道恒柴欣生
Owner SOUTH CHINA UNIV OF TECH