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Method for quickly measuring content of calcium carbonate in paper through headspace gas chromatography

The technology of headspace gas chromatography and gas chromatography is applied in the field of determination of calcium carbonate filler content in paper, which can solve the problems of unreported calcium carbonate filler, low accuracy, and many influencing factors, and achieves fast and accurate measurement speed. High efficiency and improved normal operation

Inactive Publication Date: 2014-03-05
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the device is simple and the measurement is fast; the disadvantage is that there are many influencing factors, such as the influence of paper weight, moisture, impurity elements, etc., and the accuracy is not high
[0004] At present, there is no accurate and rapid method for the determination of related calcium carbonate fillers reported.

Method used

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  • Method for quickly measuring content of calcium carbonate in paper through headspace gas chromatography
  • Method for quickly measuring content of calcium carbonate in paper through headspace gas chromatography
  • Method for quickly measuring content of calcium carbonate in paper through headspace gas chromatography

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) Weigh a paper sample with an absolute dry mass of 1.9946 grams (the paper sample is taken from a commercially available 70g / m 2 Ordinary copy paper), shredded into small pieces, placed in a high-speed disperser with a volume of 500mL, and added 250mL of sodium hydroxide solution with pH=9, dispersed at high speed for 3 minutes, and prepared into a pulp with a concentration of about 0.8% by mass suspension.

[0029] 2) Remove the pulp suspension in the high-speed disperser, and use an electric or magnetic stirrer at a certain speed to disperse the pulp fibers and filler particles evenly in the pulp suspension. Under continuous stirring, pipette 10 mL of the pulp suspension into a 20 mL headspace bottle, and seal the headspace bottle with a polytetrafluoroethylene / butyl rubber gasket and an aluminum cap. Then add 2 mL of sulfuric acid solution with a concentration of 2 mol / L with a syringe. Finally, the headspace vial loaded with the paper sample was sonicated ...

Embodiment 2

[0039]1) Weigh a paper sample with an absolute dry mass of 1.4909 grams (the paper sample is taken from Fujian Nanzhi Paper Co., Ltd.), tear it into small pieces, place it in a high-speed disperser with a volume of 500mL, and add pH =10 sodium hydroxide solution 250mL, dispersed at high speed for 3 minutes, and prepared into a pulp suspension with a concentration of about 0.6% by mass.

[0040] 2) Remove the pulp suspension in the high-speed disperser, and use an electric or magnetic stirrer at a certain speed to disperse the pulp fibers and filler particles evenly in the pulp suspension. Under continuous stirring, pipette 10 mL of the pulp suspension into a 20 mL headspace bottle, and seal the headspace bottle with a polytetrafluoroethylene / butyl rubber gasket and an aluminum cap. Then add 2 mL of sulfuric acid solution with a concentration of 2 mol / L with a syringe. Finally, the headspace vial loaded with the paper sample was sonicated for 6 minutes.

[0041] 3) Put the he...

Embodiment 3

[0050] 1) Weigh a paper sample with an absolute dry weight of 1.8013 grams (the paper sample is taken from Fujian Jinjiang Youlanfa Paper Co., Ltd.), tear it into small pieces, place it in a 500mL high-speed disperser, and Add 250 mL of sodium hydroxide solution with pH=9, disperse at high speed for 3 minutes, and prepare a pulp suspension with a concentration of about 0.7% by mass.

[0051] 2) Remove the pulp suspension in the high-speed disperser, and use an electric or magnetic stirrer at a certain speed to disperse the pulp fibers and filler particles evenly in the pulp suspension. Under continuous stirring, pipette 10 mL of the pulp suspension into a 20 mL headspace bottle, and seal the headspace bottle with a polytetrafluoroethylene / butyl rubber gasket and an aluminum cap. Then add 2 mL of sulfuric acid solution with a concentration of 2 mol / L with a syringe. Finally the headspace vial loaded with the paper sample was sonicated for 8 min.

[0052] 3) Put the head...

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Abstract

The invention discloses a method for quickly measuring the content of calcium carbonate in paper through headspace gas chromatography. The method comprises the following steps of: preparing a pulp sample to be measured from a sodium hydroxide dilute solution by a high speed agitator, acidizing the pulp sample by using sulfuric acid to generate carbon dioxide, measuring the content of the gaseous-phase carbon dioxide through the headspace gas chromatography, and calculating the content of calcium carbonate in paper according to the content of the carbon dioxide. The method is quick, accurate, good in reproducibility, easy to implement and the like. The method for measuring the content of calcium carbonate in paper is applied to the process of manufacturing paper with pulp, and capable of effectively monitoring the addition amount of a filler to paper and ensuring normal running of a paper machine and quality stability of the final product.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a method for measuring calcium carbonate filler content in paper. Background technique [0002] In the paper industry, the addition of mineral fillers to pulp has a long history. As early as the eighth century, there was a production practice of adding minerals to pulp to improve the whiteness and printing performance of paper. Adding mineral fillers to pulp has three main advantages: one is to replace part of the plant fibers with cheap fillers, which saves raw material costs; the other is that the addition of fillers can increase the water filtration speed of pulp and increase the dryness of wet paper after pressing , reduce energy consumption in the drying section of the paper machine; third, adding fillers to the paper can improve the optical properties and printing adaptability of the paper. Due to the above advantages, filling has been greatly developed in the paper industry. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/86
Inventor 曹石林马晓娟胡会超黄六莲陈礼辉
Owner FUJIAN AGRI & FORESTRY UNIV
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