公开(公告)号：US06551451B2

公开(公告)日：2003-04-22

申请号：US09740018

申请日：2000-12-20

申请人： Thanh P. Trung ,  Denys Leclerc

发明人： Thanh P. Trung ,  Denys Leclerc

IPC分类号： D21C712

CPC分类号： G01N33/343 ,  G01N21/65

摘要： A rapid method is provided for the on-line spectroscopic determination of lignin content and/or kappa number in wood pulps. Unlike currently available commercial instrumentation, the method enables one to measure lignin content independently of species variations and pulp consistency. The method includes the steps of: (1) withdrawing high-consistency samples of wood pulp from a chemical pulp manufacturing process; (2) subjecting these samples to a monochromatic visible-light source; (3) recording the resulting scattered light and its Raman spectrum over a predetermined range of wave numbers so as to produce Raman-scattered light intensity measurements; (4) determining either the uncorrected, baseline-corrected and/or integrated Raman-scattered light intensity of the samples over a predetermined range of wavenumbers shown by different combinations of lignin content, cellulose content, and consistency; (5) correlating by either univariate or multivariate calibration the relationships between the Raman-scattered light intensity measurements of unknown samples and the Raman-scattered light intensity shown by known combinations of lignin content, cellulose content, and consistency so that the lignin content and/or kappa number in wood pulps can be accurately determined over a Kappa range of 5 to 110 and preferably 5 to 20, for any levels of sample cellulose content or pulp consistency.

摘要翻译： 提供了用于木浆中木质素含量和/或卡伯值的在线光谱测定的快速方法。 与目前可用的商业仪器不同，该方法可以独立于物种变化和纸浆稠度测量木质素含量。 该方法包括以下步骤：（1）从化学纸浆制造过程中取出木浆的高稠度样品; （2）使这些样品经受单色可见光源; （3）在波数的预定范围内记录所得到的散射光及其拉曼光谱，以产生拉曼散射光强度测量; （4）在木质素含量，纤维素含量和稠度的不同组合所示的预定波长范围内确定样品的未校正，基线校正和/或积分的拉曼散射光强度; （5）通过单变量或多变量校准关联未知样品的拉曼散射光强度测量值与通过已知的木质素含量，纤维素含量和稠度组合显示的拉曼散射光强度之间的关系，使得木质素含量和/ 对于任何水平的样品纤维素含量或纸浆稠度，木浆中的卡帕值可以在5至110，优选5至20的Kappa范围内精确测定。

公开(公告)号：US20050072539A1

公开(公告)日：2005-04-07

申请号：US10991527

申请日：2004-11-19

申请人： Ronald van Heek ,  Gilles Dorris ,  Victor Uloth ,  Natalie Page ,  Thomas Hu ,  Denys Leclerc

发明人： Ronald van Heek ,  Gilles Dorris ,  Victor Uloth ,  Natalie Page ,  Thomas Hu ,  Denys Leclerc

IPC分类号： D21C11/00 ,  D21C11/12 ,  D21C7/12 ,  D21C7/14 ,  D21C11/14 ,  D21F7/06

CPC分类号： D21C11/0057

摘要： Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PSUV) or measured at 416 nm (PSVIS) and the PSUV/PSGR or PSVIS/PSGR ratio, whereby the content of active polysulphide in the total polysulphide is increased which active polysulphide can be exploited to increase pulp yield in Kraft pulping.

摘要翻译： 氧化白液经热处理以提高在285或286nm（PSUV）下测量或在416nm（PSVIS）和PSUV / PSGR或PSVIS / PSGR比例下测量的多硫化物的浓度，由此在总多硫化物中活性多硫化物的含量 增加了活性多硫化物可以利用以提高硫酸盐法制浆中的纸浆产量。

公开(公告)号：US20060196622A1

公开(公告)日：2006-09-07

申请号：US11364275

申请日：2006-03-01

申请人： Thanh Trung ,  Stephen Betts ,  Denys Leclerc

发明人： Thanh Trung ,  Stephen Betts ,  Denys Leclerc

IPC分类号： D21C7/12 ,  D21F7/06 ,  G01N21/25 ,  G01N21/35

CPC分类号： D21C3/228 ,  D21C9/1036 ,  D21C9/1052 ,  G01N21/3563 ,  G01N21/359 ,  G01N33/343 ,  G01N2021/3155

摘要： A method for the determination of cellulosic-fibre properties, such as, but not limited to, residual lignin content of chemical pulp, with the aid of a spectroscopic technique obtained over a range covering the visible and the near-infrared regions of the electromagnetic spectrum, comprising the steps of obtaining a sample from the process line, minimally removing some excess water, exposing the fibres in the sample to a large beam light source, optionally moving the sample at a constant speed, and acquiring the spectral data over a pre-determined length of time, and correlating the spectrum to a previously determined calibration so as to determine the Kappa number. Alternatively, as an arrangement for process control, along with other varying configurations, the instant invention includes the mounting of the excitation light source and fibre-optic probe along the various locations of the kraft cooking and bleaching process, such as 1) at the drum brownstock washers and 2) throughout the bleach plant deckers, located just before the doctored blade, the probe being connected to a fast scanning spectrometer, via fibre optic cables, with a computer sequencing spectral acquisition and correlating the spectrum against a predetermined calibration, and logging the results. The process configuration, with the use of the instant invention, overcomes all limitations of prior art, including sampling hardware and sample preparation, and provides true online Kappa number determinations of the order of seconds, as compared to current state of the art Kappa analyzers which require 10 to 15 minutes per analysis. The present method is capable of measuring residual lignin content of chemical pulps with varying consistency, accounts for species effects to provide species insensitivity and can provide analysis in less than 10 seconds. The method can provide true online continuous measurement of Kappa number for feedforward and feedback control of the bleaching, paper machine and kraft cooking processes.