The efficiency of treatment of paper prepared from 100% sulfite cellulose with basic agents (solutions of magnesium alkoxides or methoxycarbonate in alcohols or in supercritical carbon dioxide) to neutralize acid was studied, as influenced by the following factors: concentration of a basic agent in the neutralizing solutions, repetition of impregnation of paper with a neutralizing solution and hydrolysis of the neutralizing agent after each impregnation cycle, temperature and pressure of supercritical carbon dioxide, mixing of a neutralizing agent with supercritical CO 2 , and conditions (dynamic or static) the paper treatment with a neutralizing solution.Numerous libraries all over the world, including Russia, have accumulated a great number of decrepit and damaged documents. It is known that paper is destroyed due to hydrolytic breakdown of cellulose catalyzed with acids. Acids of various origins are present in paper: auxiliary acid additives (bleaches, sizing compounds) used in paper making, acid inc, paints, and pigments. A paper can be acidified with atmospheric sulfur, carbon, and nitrogen oxides, its acidity can increase on heating, moistening, and illumination. In order to weaken the negative effect of acids accumulated in paper, we must not only increase its pH to 8, but also provide a sufficiently large excess bacisity (henceforth the base stock) (no less than 300 mg-equiv kg !1 ) to decelerate paper aging and destruction in prolonged storage [1].
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