The dissolution or leaching behaviour of pure bulk zinc oxide and/or of zinc ferrite in sulphuric acid solution have been studied in wide range of sulphuric acid concentration and temperatures. It was supercooled and cellulose was added, which appeared to dissolve very quickly with formation of a very viscous, fiber forming, glossy, birefringent solution. The pH of the solution was adjusted by adding sulphuric acid. bisulfite. Increased Degradability of Cellulose by Dissolution in Cold Alkali. Yan Wang, Mikael E. Lindström, and Gunnar Henriksson* To enhance the degradability of cellulosic materials for further industrial purposes, different qualities of cellulose were dissolved in cold sodium hydroxide solution and precipitated by lowering the pH with sulfuric acid. The spectrum recorded at t = 0 h. showed a mixture of a and b anomers of D-cellobiose and only a trace amount of D-glucose. Decomposition experiments of microcrystalline cellulose were conducted in subcritical and supercritical water (25 MPa, 320−400 °C, and 0.05−10.0 s). Treatment of Cellulose with Sulfuric acidThe initial cellulose sample was mixed with water in a lab glass, and then 80 wt.% acid (SA) was slowly added at cooling to obtain the required final concentration of SA from 50 to 70 wt.% and acid/cellulose ratio (ACR) 10. Figure 2 represents a detailed scheme for the isolation of cellulose and SCNCs by sodium chlorite treatment followed by sulphuric acid hydrolysis. At 400 °C hydrolysis products were mainly obtained, while in 320−350 °C water, aqueous decomposition products of glucose were the main products. During dissolution, the mixture was stirred magnetically at = 600 - 700 rpm. Some compound are used sulfuric acid, hydrochloric acid, aqua bidest and acetonitrile. The kinetics of dissolution of a Nigerian phosphorite in mixed aqueous solutions of sulphuric and hydrochloric acids was investigated at temperatures of 60. to 90 °C. The concentration of sulphuric acid was varied between 0.005 and 2.5 mol/l. In ν preliminary runs, the dissolution rate was almost inde- pendent of ν for ν > 500 rpm. Full Article. Reaction Kinetics of Concentrated-Acid Hydrolysis for Cellulose and Hemicellulose and Effect of Crystallinity. D-Cellobiose sample heated in sulfuric acid-d 2 medium also used to produce a similar series of spectra. of sulphuric and oxalic acids. phenomenon has already been used for the dissolution of the cellulose acetates in Chapter 2. Hydrolysis cellulose by acid Obtained cellulose 5g in Erlenmeyer was added 200 ml sulfuric acid/hydrochlorid acid in 1.0, 1.5, 2.0, and 2.5 M so that heated at 100oC. cellulose network make dissolving the cellulose difficult. Thus, a mixture of orthophosphoric acid and polyphosphoric acid was prepared. Leaching tests with powder specimens were used to study the dissolution behavior of ZnO [2, … The glucose concentration was detected every 2 to 12 h with stirrer. In such a system, the acid functions by hydrolysing the pulp, i.e. Full Article. During this thesis work, the primary purpose was to study and evaluate the dissolution of cellulose in an acidic solvent system consisting of sulphuric acid, glycerol, and water. This study investigated the effect of acid hydrolysis of cellulose on its dissolution under mild conditions in ionic liquid, 1-butyl-3-methylimidazolium acetate/N,N dimethylacetamide (BMIMAc/DMAc). it breaks the strong interactions
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