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Method for reducing methanol content of paper pulp

A technology for methanol content and pulp, which is applied in the pulp and paper industry to achieve the effects of simplified operation process, good correlation and simple operation

Inactive Publication Date: 2016-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the study on the adsorption behavior of methanol in the water-pulp system has not been reported

Method used

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  • Method for reducing methanol content of paper pulp
  • Method for reducing methanol content of paper pulp
  • Method for reducing methanol content of paper pulp

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Embodiment Construction

[0045] The present invention will be described in further detail below in conjunction with specific embodiments.

[0046] Adsorption of methanol on pulp at four temperatures:

[0047] (1) Sample preparation process: Weigh 0.2g of dry pulp in a headspace bottle, add 30, 50, 80, 100, 200, 300, 500, 800, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500ppm methanol aqueous solution to fill up, Immediately cover and seal to prevent evaporation of methanol into the gas phase. At 28°C, 45°C, 60°C, 75°C at 200r·min -1 The rotation speed was oscillated for 24 hours to make the adsorption reach equilibrium. After filtration, take the filtrate for testing.

[0048] (2) Establish a standard curve: configure 50mL of 5000ppm methanol solution as the mother solution to prepare methanol solutions with different concentration gradients, measure 1mL in a headspace bottle, and perform headspace gas phase detection to obtain a standard curve of peak area and methanol concentration;

[0049] (3)...

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Abstract

The invention discloses a method for reducing the methanol content of paper pulp. The method comprises the following steps: (1) pretreating a sample; (2) establishing a standard curve; (3) detecting the sample by using a headspace gas chromatograph; (4) calculating a result and establishing an empirical model. The method has the organic effects that the adsorption kinetics of methanol on non-floated eucalypt kraft pulp is checked; after fitting is carried out respectively with Langmuir and Freundlich, fitting results are compared, so that a temperature parameter is introduced into the Freundlich model for least square fitting, to obtain a methanol adsorption amount and empirical models of the concentration and the temperature of methanol; furthermore, the fitting results are objective and accurate for reference during adjustment of a papermaking production procedure (such as pulp washing).

Description

technical field [0001] The invention relates to the field of pulp and papermaking industry, in particular to a method for reducing methanol content in pulp. Background technique [0002] Methanol is a toxic volatile organic compound (VOC). Its ingestion or long-term exposure to an environment with excessive methanol content will cause a variety of discomfort symptoms in the human body, and in severe cases, it will cause permanent damage to the human optic nerve, central nervous system and other nervous systems. It is even life-threatening. Therefore, European and American countries and my country have formulated regulations on the allowable limit of methanol content in some occasions (food, beverages, workplace air, etc.), such as: the European Union's limit for methanol in food is 10mg kg -1 . [0003] Methanol is the product of the reaction of lignin and methoxy on hemicellulose in papermaking raw materials during pulping or bleaching (accounting for 90% of the total VOC g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 阳玉琴柴欣生
Owner SOUTH CHINA UNIV OF TECH
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