IDENTIFICATION OF THE EXTRACTIVES CHEMICAL COMPOUNDS IN NEWSPRINT BY GC/MS METHODS

摘要

About 52,000 t/y newsprints are produced from CMP pulp in Mazandaran Pulp and Paper Industries (in north of Iran), but this mechanical pulps are susceptible to photo-oxidative reactions which cause the pulps to become discolored and brightness reversion. Some extractives compounds have been proposed or considered as initiators or the main cause of yellowing in high-yield and mechanical pulps. In this research, paper samples were chosen randomly from paper newsprint produced in Mazandaran Pulp and Paper Mill. At first stage, the paper flour provided and then measured extractive percent by the TAPPI standards. The results showed that average of extractives was 6.92% percent in newsprint. In the second stage, paper flour washed by toluene – ethylic alcohol with the 2:1 ratio and added BSTFA to extractives residue. Then the samples kept in Ben Marry Bath in 70 degree of centigrade for an hour, and they were analyzed by GC/MS. Finally, the GC diagram was used for identification of the compounds; it shows the abundance and retention time of each compound and calculation of quartz index and Adams table. Generally, 58 compounds definite in newsprint. The Benzaldehyde (32.56%), Silan, trimethyl(12.65%), Bis(2-ethylhexyl) phthalate (6.98%), Gamma-Sitosterol (4.84%), n-Hexadecanoic acid(4.56%), Bibenzyl (3.82%) were the most compounds and the Dodecanoic acid (0.14%), Decan(0.18%), Xylene (0.19%), Benzen,1-methyl-4- phenylmethyl (0.2%) were lowest compounds respectively, too. These compounds are very important in yellowing and brightness stability of newsprint.