Analytical Methods in Wood Chemistry, Pulping, and by E. Sjöström (auth.), Prof. Dr. Eero Sjöström, Prof. Dr.

Analytical Methods in Wood Chemistry, Pulping, and by E. Sjöström (auth.), Prof. Dr. Eero Sjöström, Prof. Dr.

By E. Sjöström (auth.), Prof. Dr. Eero Sjöström, Prof. Dr. Raimo Alén (eds.)

In its broadest experience, and in keeping with the normal belief, wooden chemistry is a complete self-discipline, starting from basic reports to sensible functions. The manifold materials, situated in numerous morphological areas within the wooden, ends up in an severe complexity of wooden chemistry. Ever extra refined endeavors desiring primary reviews and complex analytical equipment are worthwhile which will delve deeper into numerous difficulties in pulping and papermaking. steadily, new, better ana­ lytical equipment, initially built for study reasons, are presently exchanging the various outdated "routine" equipment in useful functions. due to the expanse of the topic, an try to write a e-book of this dimension approximately analytical tools turns out, probably, too formidable. after all, an entire e-book sequence of a number of volumes will be essential to conceal this subject thoroughly. even if, there's definitely a necessity for a extra condensed presentation which doesn't move into experimental information, yet is restricted to the fundamental rules of the analytical equipment and illustrates their applica­ tions. The emphasis is on extra complex and strength tools, and partic­ ularly on these in response to kinds of spectroscopy and chromatography.

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Additional info for Analytical Methods in Wood Chemistry, Pulping, and Papermaking

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In hardwood kraft pulps, deacetylated glucuronoxylan (with much fewer acid side chains than in the original wood xylan) is the major hemicellulose constituent. In softwood sulfite pulps the hemicelluloses are glucomannan (practically completely deacetylated during acid sulfite pulping) and glucuronoxylan. No galactose and arabinose substituents are present. The content of glucuronic acid groups in sulfite pulp xylan is higher than that in kraft pulp xylan. Glucuronoxylan is the major hemicellulose constituent in hardwood sulfite pulps, but its content is much lower than in hardwood kraft pulps.

This is due to the fact that barium hydroxide forms insoluble complexes with glucomannans based on the reaction of barium hydroxide with the cis-2,3-diols of mannopyranose units. Other precipitating agents for glucomannans are Fehling's solution or other copper salts as well as basic lead acetate. In particular, acidic polysaccharides such as glucuronoxylans form precipitable complexes with cetyltrimethylammonium bromide or hydroxide. In addition, borate complexes allow selective salt formation with cetyltrimethylammonium hydroxide to be used, for example, in the fractionation of neutral arabinogalactans.

Toxic Components. Today, elementary chlorine has been almost entirely eliminated as a bleaching agent at least in Nordic countries, but chlorine dioxide is still in widespread use. Since even traces of some chlorinated organic compounds can be extremely toxic, very sensitive analyses, based on mass spectrometry, have been developed for detection of them as well as other potentially harmful components in pulps. 2 Mechanical and Chemimechanical Pulps Stone groundwood (SGW), pressure groundwood (PGW), refiner mechanical (RMP), and thermomechanical pulps (TMP) are the main types of mechanical pulps.

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