Download PDF, EPUB, MOBI An Improved Preparation of Levoglucosenone from Cellulose.

An Improved Preparation of Levoglucosenone from Cellulose. Joseph Allan Marshall

Author: Joseph Allan Marshall
Date: 01 Sep 2011
Publisher: Proquest, Umi Dissertation Publishing
Language: English
Format: Paperback::40 pages
ISBN10: 1243387629
File size: 12 Mb
Filename: an-improved-preparation-of-levoglucosenone-from-cellulose..pdf
Dimension: 202.95x 254x 2.54mm::104.33g

Download Link: An Improved Preparation of Levoglucosenone from Cellulose.

When heat is applied to cellulose, Levoglucosenone, water and char which has been maintained as production volumes have increased: the Levoglucosenone (1) is produced in ca. 12% yield from cellulose. The preparation is carried out under reduced pressure and in the presence of soybean oil and 2.5% phosphoric acid based on the cellulose mass. Various factors are investigated to determine the effect they have on the yield of 1 from cellulose, and the optimized procedure is given. 10 Cellulose Prof. Dr. Dieter Klemm1, Prof. Dr. Hans-Peter Schmauder2, Prof. Dr. Thomas Heinze3 1InstituteofOrganicandMacromolecularChemistry,FriedrichSchillerUniversity Cellulose Catalytic pyrolysis Acid Levoglucosenone Furfural into polysaccharide as a key reaction to carbonized product formation. J Wood Levoglucosenone has been used as template for the synthesis of a wide variety of compounds with an impressive structural variability. However, scarce work has been done regarding the generation of new bioactive entities. Here we report the cytotoxic AIChE websites use cookies to offer you a better browsing experience and The production of levoglucosenone (LGO) via levoglucosan (LGA) and We showed that the conversion of cellulose to LGO using a solid acid This paper presents a novel method for continuous production of a biomass-derived platform chemical, levoglucosenone (LGO), from cellulose without its pretreatment or use of solvent. First, cellulose is pyrolyzed, and then the volatiles are reformed over a catalyst consisting of a type of ionic liquid supported over porous char. The ionic Buy An Improved Preparation of Levoglucosenone from Cellulose. Book online at best prices in India on Read An Improved Preparation of Levoglucosenone from Cellulose. Book reviews & author details and more at Free delivery on qualified orders. Catalytic pyrolysis of cellulose in sulfolane (tetramethylene sulfone) with sulfuric acid or polyphosphoric acid gave levoglucosenone, furfural, and 5-hydroxymethyl furfural (5-HMF) up to 42.2%, 26.9%, and 8.8% (as mol% yield based on the glucose unit), respectively. pyrolysis products hinders its further application demands a better understanding of the First of all, this study investigated the interactions among cellulose, Uncatalysed mechanism for the formation of levoglucosenone. Disclosed are processes comprising contacting an aqueous reaction mixture having an initial pH between about 3 and about 6 and comprising levoglucosenone with a catalyst, and heating the reaction mixture to form a product mixture comprising 5-hydroxymethyl-2-furfural. The processes may further comprise heating the product mixture comprising 5 Activated carbon (AC) prepared chemical activation with H3PO4 (named AC-P) was employed for catalytic fast pyrolysis of cellulose and biomass to selectively produce levoglucosenone (LGO). The catalytic pyrolysis behaviors and product distributions were revealed via both analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and Glucose yield must be improved to make the dilute acid process more economically viable. Glucose degradation [7] and cellulose modification [8-9] are two factors that limit glucose yields in dilute acid hydrolysis. Pre-activation, transforming crystalline cellulose to amorphous cellulose (decrystallization), allows mild conditions to be used in levoglucosenone or in one step from Cyrene,a novel product already shown to be easily produced from bio-derived levoglucosenone. Long term: Proving the feasibility of bio-derived levoglucosenone production has the potential to open up a new field of chemistry. Bio-derived compounds from levoglucosenone three steps from sawdust to solvents Production of levoglucosan and glucose from pyrolysis of cellulosic materials. Fred Selective low-temperature pyrolysis of microcrystalline cellulose to produce levoglucosan and levoglucosenone in a fixed bed reactor, Fuel Processing Performance of improved bacterial cellulose application in the production of This study aims to evaluate the possibilities of the production of Industrial hemp (Cannabis sativa L.) shives were used as the raw material for the study. Pretreated hemp shives: possibilities of conversion into levoglucosan and levoglucosenone. Cellulose. Composition. Conversion. Feedstocks. Furfural. Hemicelluloses. Fast pyrolysis of cellulose with solid acid catalysts for levoglucosenone. HZSM-5 may not be suitable for catalytic cracking of vapor from cellulose pyrolysis in the preparation of LGO due to the microporous structure. The median pore diameter is less than 1 nm The higher surface area of alumina did not improve the LGO activity and