Origin analysis and characterization of dissolved and colloidal substances from white water in fine paper mill

doi:10.3969/j.issn.1000-2006.2015.03.020

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (03): 106-112.doi: 10.3969/j.issn.1000-2006.2015.03.020

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Origin analysis and characterization of dissolved and colloidal substances from white water in fine paper mill

CHEN Chen, WANG Jingjing, MAO Shengtao, SU Wenpeng, DAI Hongqi^*

Jiangsu Provincial Key Lab of Pulp and Paper Science, College of Light Industry Science and Engineering, Nanjing Forestry University, Nanjing 210037, China

Online:2015-05-30 Published:2015-05-30

Abstract

Abstract: The origin and characteristics of dissolved and colloidal substances(DCS)from a high closed white water system in fine paper mill were analyzed in this paper. The DCS were separated from white water by centrifugation-extraction and the MTBE extracts were analyzed by gas chromatography mass spectrometry(GC-MS). The morphological character of DCS was observed with microscope and laser particle size analyzer, and the molecular weight distribution and thermal weight loss properties of DCS were detected by gel permeation chromatography(GPC)and thermogravimetry analysis(TGA). The results showed that the DCS mainly originated from latex, paper additives and their ineffective products such as defoaming agent, dispersant, surface sizing agent, brightening agent, but very few from lignin degradation. The particle size distribution of DCS was in the range of 500～4 000 nm, and the colloidal substance was dispersed in form of floc or absorbed on the surface of fines. The main molecular weight distribution area of DCS was Symbol|@@1 400 u and Symbol～@@ 12 600 u, and the macromolecular substances of DCS may be separated by ultrafiltration membrane with a cut off value of 10 ku. The DCS present obvious thermal weight loss during 100～700 ℃.

CLC Number:

X793

CHEN Chen, WANG Jingjing, MAO Shengtao, SU Wenpeng, DAI Hongqi. Origin analysis and characterization of dissolved and colloidal substances from white water in fine paper mill[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2015, 39(03): 106-112.

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Origin analysis and characterization of dissolved and colloidal substances from white water in fine paper mill

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