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Paper deacidification method

A paper and deacidification technology, applied in the post-processing of waste paper, etc., can solve the problems of long reaction processing time, bending of book paper, cross-dying, etc., to achieve simple and easy repair and protection, speed up processing, and delay the generation of acidification. Effect

Active Publication Date: 2009-09-23
GUANGDONG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The invention provides a method for deacidifying books by using supercritical fluid to overcome the problem that in the existing method, the reaction treatment time is too long, causing a large amount of organic pollution, and there are hidden fire hazards. Defects such as cross-staining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take a 62-year-old newspaper with a paper pH of 4.3 and fill it with 2L supercritical CO 2 In the treatment kettle, purify and treat for 30 minutes under the conditions of 20MPa and 40°C to remove the acidic substances that are easier to be extracted. The pH of the newspaper after treatment was measured to be 6.1.

Embodiment 2

[0029]Take a 65-year-old newspaper with a paper pH of 4.4 and fill it with 2L supercritical CO 2 In the treatment kettle, adjust the supercritical treatment conditions so that the pressure of the treatment kettle is 39MPa and the treatment temperature is 53°C, and then inject the entrainer magnesium bicarbonate-ethanol solution from the auxiliary pump, wherein magnesium bicarbonate 0.04g, ethanol 750ml, treatment time for 5 hours, CO 2 The fluid flow rate is 0.500t / h. The pH of the newspaper after treatment was measured to be 6.3.

Embodiment 3

[0031] Take a 67-year newspaper with a paper pH of 3.9 and fill it with 2L supercritical CO 2 In the extraction kettle, purify for 90 minutes at 14MPa and 43°C to remove acidic substances that are easier to be extracted. Squeeze into entrainer magnesium carbonate-ethanol from secondary pump then, propanol solution, wherein magnesium carbonate 0.03g, ethanol 500ml, propanol 500ml, regulate supercritical extraction condition, make extraction kettle pressure be 34MPa, extraction temperature is 45 ℃, process Time is 3.5 hours, CO 2 The fluid flow rate is 0.057t / h. The pH of the newspaper after treatment was measured to be 6.8.

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PUM

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Abstract

The invention discloses a paper deacidification method by using a supercritical fluid technology. The method comprises the following steps: placing paper (particularly ancient books) in a supercritical CO2 treatment device, extracting and purifying before adding a deacidification agent and an entrainer for treatment so that the paper approaches to neutral. The invention applies the supercritical fluid technology to the paper deacidification method to save time and labor and avoid organic solvent pollution, and the treated paper is not bent and deformed and has no phenomena, such as color diffusion, ink diffusion, conglutination, and the like.

Description

technical field [0001] The invention relates to a method for deacidifying paper with supercritical fluid, in particular to a method for deacidifying ancient books with supercritical fluid. Background technique [0002] Books are the spiritual product of human civilization, as well as the main carrier and representation of human material civilization and culture. They are closely related to the development process of human culture and productivity in various historical periods, and are left to us by thousands of years of splendid civilization history. A rich historical and cultural heritage. According to statistics, the ancient books and documents collected by various libraries in our country have reached 30 million volumes. However, due to its long history, it has experienced disasters such as fire and water, wars, rat bites and insect bites, and some precious rare books handed down from generation to generation are also riddled with holes and incomplete. Today, the ancien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H25/18
Inventor 方岩雄谭伟胡明雪陶建强张焜杜志云
Owner GUANGDONG UNIV OF TECH
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