Deacidification of Paper Using Supercritical Carbon Dioxide Containing Calcium Propionate or Magnesium Bicarbonate

Li Fen Cheng · Yan Xiong Fang

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Conservation Techniques and Studies Phase Equilibria and Thermodynamics Material Properties and Processing

Abstract

Supercritical carbon dioxide (SCCO2) containing calcium propionate or magnesium bicarbonate was used to deacidify paper. In the experiment, to compare the effects of SCCO2 technology deacidification and immersion deacidification, two kinds of paper samples were chosen to do these two kinds of deaciditication tests respectively. And pH, alkali reserve and mechanical properties of paper samples were measured before and after these treatments. The experiments showed that the pH and alkaline reserve of paper samples treated with SCCO2 were nearly similar to that of immersion treatments. Otherwise, compared with immersion deacidification, supercritical carbon dioxide had some advantages of strengthening the mechanical properties of paper and shortening treatment time.

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References

2006Deacidification of paper using dispersions of Ca(OH)2 nanoparticles in isopropanol. Study of efficiency 2009A study of mechanical properties of papers exposed to various methods of accelerated ageing. Part I. The effect of heat and humidity on original wood-pulp papers 2012Preservation of aged paper using borax in alcohols and the supercritical carbon dioxide system 2003Mass Deacidification of Paper and Books. I: Study of the Limitations of the Gas Phase Processes

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