2 edition of Formation of resin acids during mechanical pulping found in the catalog.
Formation of resin acids during mechanical pulping
|Statement||G. Peng ; supervised by J.C. Roberts..|
|Contributions||Roberts, J. C., Paper Science.|
Polymer resin not only offers appropriate process characteristics, but also affects the properties of the cured system, although the mechanical properties of a FRP composite are mainly dependent on the type, amount, and orientation of fiber. One of the great design strengths of composites is the multiple. A gas liquid chromatography system for the analysis of complex mixtures of fatty and resin acids has been developed. On 30–40 m long, mm ID glass capillary columns coated with 1,4‐butanediol succinate (BDS) and attaining o effective theoretical plates, all main fatty and resin acids in wood extractives and various tall oil products can be separated and quantitatively.
Fatty acids Resin acids Sterols Steryl esters Neutral diterpenoids — Waxes — Mono-/di-/triglycerides Total Table 1. Major wood resin compounds in pine softwood and aspen hardwood (Ekman, Holmbom ). Ekman, R. and B. Holmbom. Analysis by gas chromatography of the wood extractives in pulp and water samples from mechanical pulping of spruce. Nordic Pulp and Paper Res. J. No. 1. pp. Ekman, R. Resin during storage and in biological treatment. In: Pitch control, wood resin and deresination. E.
A high extractive-content temperate conifer wood (Pinus elliottii) was examined as a pulpwood source by organosolv pulping. Particularly, the behavior of the resin- and fatty acids during the lignin solvolysis process was studied in detail. For this purpose the resin-and fatty acids were characterized in the wood, and after pulping trials in order to reveal their fate during pulping, using. USA1 US11/, USA USA1 US A1 US A1 US A1 US A US A US A US A1 US A1 US A1 Authority US United States Prior art keywords pulp process composition laccase mediator Prior art date Legal status (The legal status is .
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Extractives is also vital. Monitoring resin acids during storage time, for example, plays an important role in the success of the papermaking process.
The most common method for the analysis of fatty and resin acids in papermaking process waters is gas chromatography (GC) with a flame ionization detector (FID) (Örså and Holmbom ).
to resin acid recovery. Two of the most stable resin acids, dehydroabietic acid and dihydropimaric acid [8(14) pimarenoic acid], were used as models in the first ex periments.
More than of these resin acids were TABLE V. Gas-liquid chromatographic analysis of resin acid composition before and after kraft Size: 60KB. Download Citation | Formation of resin acids during thermomechanical pulping | A series of chip, pulp and process water samples from various stages of a thermomechanical pulping process have been.
The commercial manufacture of wood pulp grade chemical cellulose using the kraft chemical pulping processes releases resin acids. The Kraft process is conducted under strongly basic conditions of sodium hydroxide, sodium sulfide and sodium hydrosulfide, which neutralizes these resin acids, converting them to their respective sodium salts, sodium abietate, ((CH 3) 4 C 15 H 17.
It was shown that about 40% of fatty acids and their esters in mechanical pulp (i.e. steryl esters and triglycerides) are derived from linoleic acids. By using GC/FID, we were able to determine the amount of lipophilic and hydrophilic extractives in control and enzyme treated by: Mechanical pulping and subsequent bleaching scarcely affect resin composition.
Therefore, pitch deposits in mechanical pulping show a chemical composition similar to lipophilic extractives from wood used as a raw material (e.g., triglycerides, resin acids and fatty acids in pitch deposits from pine mechanical pulping.
Sources of resin acids in the mechanical pulp mill and their removal during effluent biotreatment. Proc. Spring Conference, Canadian Pulp and Paper Association, Technical Section, Pacific Coast and Western Branches, Jasper, Alta., S5, # 1.
Bohn, W. and Sferrazza, M. Alkaline Peroxide Mechanical Pulping. “Resin and fatty acids analysis, especially during mechanical pulping processes, and have pulp production (Alén ).
The formation of extractives-derived pitch deposits is an unavoidable occurrence, and a series of procedures have been developed to reduce this.
pulp; triglycerides, resin acids and sterols (65 – % decrease) from spruce TMP pulp; and fatty alcohols, alkane s and sterols (% decrease) from flax soda pulp (Fig. The purpose was to investigate how the resin amount, and the composition of different components in the resin, varies in the birch pulping process producing White top kraftliner at the pulp and paper mill SCA Packaging Munksund.
The variation in amount of resin, from chips to fully bleached pulp, is going to be compiled in a resin profile. Acid Sulfite Pulping Process Description - The production of acid sulfite pulp proceeds similarly to kraft pulping, except that different chemicals are used in the cooking liquor.
In place of the caustic solution used to dissolve the lignin in the wood, sulfurous acid is employed. To buffer the cooking solution, a bisulfite of. including wood-based chemical and mechanical pulping, recycled fiber pulping, and pulping based on non-wood raw materials such as bagasse, straw, and reed.
which is also a source of resin acids. Resin acids, especially those based on coniferous wood pulp, can be toxic to fish and have been identified as potentially being produced during.
Eighty percent of the toxicity was due to resin acids and three unsaturated fatty acids in KME from hemlock and fir pulping wastes. The acute toxicity of the more common resin acids and fatty acids in KME is given in Tables 4 and 5.
The toxicity of resin acids was greater at. Papermaking - Papermaking - Processes for preparing pulp: Mechanical or groundwood pulp is made by subjecting wood to an abrading action, either by pressing the wood against a revolving grinding stone or by passing chips through a mill.
The wood fibres are separated and, to a considerable degree, fragmented. Chemical wood pulp is made by cooking wood chips with chemical solutions in digesters.
Extractives in wood are often referred to as pitch, and these substances can consist of resin and fatty acids and other materials that are soluble in neutral, nonpolar organic solvents ().Wood extractives can be a problem in pulp and paper production, especially mechanical pulping processes, where pitch deposits on paper-making machines result in reduced paper quality ().
Wood Resin and Deresination Ernst L. Black and Lawrence H. Allen, Editors Page 1 of 6 Item Number B ISBN: pages, hard cover. This new textbook covers all aspects of wood resin, with special emphasis on its effects on the manufacture of pulp, paper, and board.
This unique book. Lipophilic extractives responsible for pitch problems include fatty acids, fatty alcohols, resin acids, hydrocarbons, steroids, triterpenoids, and triglycerides. Therefore, biotechnological processes capable of modifying these compounds would be potential tools for reducing pitch problems during pulp.
from TMP during mechanical pulping. Galacturonic acid is, for instance, found in wood pectins. The reported amount of pectins in Norway spruce is only about 1 to 2%, but these are still of importance in papermaking, since uronic acids are the main contributors to the anionic charge of mechanical pulps ().
6 Appita • Innovation. Structural changes in lignin during oxygen bleaching, G. Gellerstedt, K. Gustafsson and E.L. Lindfors, Nordic Pulp and Paper Journal (3): () 8. Chlorine dioxide oxidation of lignin model phenols, G.B. Strumla and W.H. Rappson, Pulp and Paper Canada, 78 (12), TR () 9.
Bleaching of mechanical pulp is much different than that for chemical pulp. Mechanical pulping leaves the lignin and the cellulose intact, whereas the purpose of chemical pulping is to chemically sepa-rate the lignin from the cellulose fibers and remove it from the pulp.
A major advantage of mechanical pulping is the high yields of pulp that can be. A similar pattern has been found previously during pine wood treatment with Ophiostoma ainoae. O. piliferum (Cartapip strain from Clariant) has been reported to be useful for reducing pitch problems in mechanical pulping of pine wood, as well as in spruce sulfite pulping.
However, this strain proved to have limited utility in the case of.J. Am. Chem. Soc. All Publications/Website.
OR SEARCH CITATIONS.The anticipated amenability of the concentrated non-sulphur alkaline-peroxide mechanical pulping effluents to anaerobic treatment was confirmed by elevated methane yields of m3/kg CO4 obtained during testing of the various process waters.