Conference Presentations (since 1998)

1. James Falabella, Xin-Sheng Chai, Amyn S. Teja, Gas and Volatile Organic Compound Partitioning in Aqueous Environments, AIChE Annual Meeting, San Francisco, CA, 2006.



2. Chai, Xin-Sheng, Verrill, Christopher, Determination of Sulfate Ions in Kraft Black Liquors by a Turbidity Method, 2006 Engineering, Pulping, and Environmental Conference, Atlanta, GA, November 5-8, 2006.



3. Zhang, Dongcheng, Courchene, Chuck, Chai, XinSheng, Ragauskas, Arthur,  The effect of sequential bleaching on total fiber charge of SW kraft pulp fibers, 2006 Engineering, Pulping, and Environmental Conference, Atlanta, GA, November 5-8, 2006.



4. Xian-nan Huang, Xin-Sheng Chai, Qi-feng Yang, and J. Samp, A Novel Headspace Gas Chromatographic Technique for the Determination of Oxalate Content in Bleaching Liquor, 5th International Non-wood Fiber Pulping and Papermaking Conference and the 3rd International Symposium on Emerging Technology of Pulping and Papermaking, Guangzhou, China, Nov. 8-10, 2006.  



5. Hai-nong Song , Cheng-rong Qin, Xin-Sheng Chai, Dong-Cheng Zhang, and Qingxi Hou, Rapid Determination of Pulp Copper Number by Spectroscopy, 5th International Non-wood Fiber Pulping and Papermaking Conference and the 3rd International Symposium on Emerging Technology of Pulping and Papermaking, Guangzhou, China, Nov. 8-10, 2006.  



6. Qingxi Hou, Xin-Sheng Chai, Junyong Zhu, A Modified Method for the Determination of the Carboxyl Groups in Fibers by Headspace Gas Chromatography, 2006 Pan Pacific Conference that will be held from June 6-9, Seoul, Korea, 2006.



7. Xin-Sheng Chai, Jinghong Zhou, Hongxiang Zhu, and Xiannan Huang, A chemometric aided UV spectroscopic method for kinetic study of additive adsorption in cellulose fibers, 2006 Pan Pacific Conference that will be held from June 6-9, Seoul, Korea, 2006.



8. Xiannan Huang , Hainong Song, Chengrong Qin, Sung-Hoon Yoon and Xin-Sheng Chai, Study on the mass transfer behavior of AQ and its effectiveness during AQ-kraft pulping process, 2006 Pan Pacific Conference that will be held from June 6-9, Seoul, Korea, 2006.



9. Song Hai-Nong, Chai Xin-Sheng, Zhu Hong-Xiang, Sung-Hoon Yoon, Zhang Dongcheng and Wang Shuang-Fei, Study on Odor Formation Control during Kraft Pulping, 2006 Pan Pacific Conference that will be held from June 6-9, Seoul, Korea, 2006.



10. Chengrong Qing, Hong-Xiang Zhu, Hainong Song, Hui Yan, and Xin-Sheng Chai, Mass transfer mechanism of anthraquinone during alkaline wood pulping, 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006.



11. Amyn S. Teja, James Falabella, and Chai, X.S., Henry's Constants of Volatile Organic Compounds in Aqueous Electrolyte Solutions, AIChE Annual Meeting, Cincinnati, OH, 2005.



12. Chai, X.S. and C.L. Verrill, Determination of Inorganic Salt Solubility by Headspace Gas Chromatography, AIChE Annual Meeting, Cincinnati, OH, 2005.



13. Teja, Amyn S.; Falabella, James B.; Chai, Xin-Sheng, Measurement and correlation of Henry's constants of volatile organic compounds in aqueous salt solutions, 2005 AIChE Spring National Meeting, Conference Proceedings, 2005 AIChE Spring National Meeting, Conference Proceedings, 2005, p 3123.



14. Zhang, D., Chai, X.-S., Ragauskas, A.J. , 2005 TAPPI Engineering, Pulping, Environmental Conference - Conference Proceedings , Chemical modification of pulp fibers by selective catalytic oxidation during oxygen delignification, Volume 2006, 2006, 12p 



15. Zhang, Dongcheng; Hou, Qingxi; Chai, Xin-Sheng; Ragauskas, Arthur, Tailoring fiber properties during one-stage oxygen delignification fiber acid group content development, TAPPI Fall Technical Conference, 2004 TAPPI Fall Technical Conference: Engineering and Pulping, Proceedings, 2004, p 465-488,



16. Chai, X.S., Hou, Q.X., C.L. Verrill, Rapid Determination of Total Dissolved Solids in Black Liquors by ATR-UV/VIS Spectroscopy, International Chemical Recovery Conference, Charleston, SC, 2004.



17. Fu, Shiyu; Chai, Xinsheng; Hou, Qingxi; Lucia, Lucian A., The chemical barrier for oxygen delignification, 2004 TAPPI Paper Summit - Spring Technical and International Environmental Conference, 2004 TAPPI Paper Summit - Spring Technical and International Environmental Conference, 2004, p 55-64.



18. Chai, X.S., Q. X. Hou, and J.Y. Zhu, The Fate of Carboxyl Groups during Alkaline Delignification and Its Application for Fiber Yield Prediction in Alkaline Pulping,  Tappi Fall Technical Conference, Chicago, IL, October, (2003).



19. Chai, X.S., Yang, X.T., Hou, Q.X., Zhu, J.Y., and Danielsson, L.-G. (2003), “Spectroscopic Determination of Anthraquinone in Kraft Pulping Liquors Using A Membrane Interface,” The 12th Int, Symp. on Wood and Pulping Chemistry (ISWPC), Madison, WI, USA, June.



20. Chai, X.S., Hou, Q.X., Zhu, J.Y., Chen, S.-L., Wang, S.F., and Lucia, L. (2003), “Determination of Carboxyl Groups in Wood Fibers by Headspace Gas Chromatography,” The 12th Int, Symp. on Wood and Pulping Chemistry (ISWPC), Madison, WI, USA, June.



21. Zhu, J.Y., Nelson, K.L., and Chai, X.S., (2002) “Direct and Optical Determination of Pulp Kappa Number for Online Monitoring,” Presented at the 2nd International Symposium on Emerging Technologies of Pulping and Papermaking, GuangZhou, China, October.



22. Chai, X.S., Luo, Q., and Zhu, J.Y., (2002), ”Peroxide Determination in Bleaching Streams by Spectrophotometry,” Presented at the 2nd International Symposium on Emerging Technologies of Pulping and Papermaking, GuangZhou, China, October.



23. Zhu, J.Y, Chai, X.S., Pan, X.J., Luo, Q., and Li, J., (2002) “Phase Transition Cooking to Reduce Organic Sulfur Compound Formation in a Commercial Wood Pulping Process,” 2002 TAPPI Engineering conference, San Diego, CA, September.



24. Chai, X.S., Luo, Q., and Zhu, J.Y., (2002), “Minor Sources of Carbonate in Alkaline Processes,” 2002 TAPPI Engineering conference, San Diego, CA, September.



25. Zhu, J.Y., Chai, X.S., and Li., J., (2002), “An ATR-UV Sensor for Simultaneous On-Line Monitoring of Sulfide, Hydroxide, and Carbonate in Kraft White Liquors During Mill Operations,” Accepted for presentation at the 2002 TAPPI Engineering conference, San Diego, CA, September.



26. Zhu, J.Y., Chai, X.S., Luo, Q., and Li, J., (2001), “ATR-UV Sensor for On-line Kraft Liquor Analysis,” Presented at the AIChE Annual Meeting, Reno, November.



27. Zhu, J.Y., Chai, X.S., and Luo, Q. (2001),”Rapid Determination of Hydrogen Peroxide in Bleaching Streams by Spectrophotometry,” Presented at the AIChE Annual Meeting, Reno, November. 



28. Nelson, K., Zhu, J.Y., and Chai, X.S., (2001),.”Optical Kappa Number Determination using a single wavelength light source,” the AIChE Annual Meeting, Reno, November.



29. Liu, J., Hsieh, J.S., Zhu, J.Y., and Chai, X.S., (2001),” A UV Spectroscopic Method for Simultaneous Determination of Kymene®1500 and Softrite®7516’s Concentration in the Papermaking Solutions,” Presented at the AIChE Annual Meeting, Reno, November.



30. Chai, X.S., Luo, Q., Zhu, J.Y., and Li, J., (2001), “Online Analysis of Alkali, Sulfide, and Dissolved Lignin during Kraft Pulping by Attenuated Total Refection UV Spectroscopy,” TAPPI Pulping Conference, Seattle, WA, November



31. Yoon, S.-H., Chai, X.S., Zhu, J.Y., Li, J., and Malcolm, E.W., (2001), "In-Digester Odor Reduction in Kraft Pulping," the 11th Int, Symp. on Wood and Pulping Chemistry (ISWPC), Nice, France, June.



32. Chai, X.S., Yoon, S.-H., Zhu, J.Y., Li, J., (2001), "The Fate of Hexenuronic Acid Groups during Alkaline Pulping of Loblolly Pine," the 11th Int, Symp. on Wood and Pulping Chemistry (ISWPC), Nice, France, June.



33. Chai, X.S.,  Luo, Q., Yoon, S.-H., Zhu, J.Y., (2001), "The Fate of Hexenuronic Acid Groups during Kraft Pulping of Hardwoods," the 11th Int, Symp. on Wood and Pulping Chemistry (ISWPC), Nice, France, June.



34. Chai, X.S., Zhu, J.Y., and Li, J., (2001), "A Simple and Rapid Method to Determine Hexenuronic Acid Groups in Chemical Pulps," the 11th Int, Symp. on Wood and Pulping Chemistry (ISWPC), Nice, France, June.



35. Zhu, J.Y., Chai, X.S., and Luo, Q., (2001), "The Formation of Volatile Organic Compounds (VOCs) in Kraft Mill Multi-Effect Evaporator," 2001 International Chem. Recovery Conference, Whistler, BC, Canada, June.



36. Chai, X.S., Li, J., and Zhu, J.Y., (2001), "An ATR-UV Sensor for Simultaneous Online Monitoring of Sulfide, Hydroxide, and Carbonate in Kraft Mill Recausticizing Operations," 2001 International Chem. Recovery Conference, Whistler, BC, Canada, June.



37. Chai, X.S., Luo, Q., and Zhu, J.Y., (2001), "Carbonate Analysis in Black Liquors from Pulping and Evaporation Processes," 2001 International Chem. Recovery Conference, Whistler, BC, Canada, June.



38. Zhu, J.Y. and Chai, X.S., (2001), "Simultaneous Analysis of Sulfide, Hydroxide, and Carbonate by ATR-UV Spectroscopy during Borate Autocausticizing Mill Trials, " Presented at the 15th International Forum Process Analytical Chemistry - IFPAC, Amelia Island, FL, Jan. 21-24, 2001.



39. Luo, Q., H.B. Liu, Zhu, J.Y., and Chai, X.S., (2000), "A Kinetics-Based Model for Predicting Kappa Number during Batch Krfat Cooking," presented at the AIChE Annual Meeting, Los Angeles, Nov., 2000.



40. Chai, X.S., Li, J., and Zhu, J.Y., (2000), "Simultaneous and Rapid Analysis of Hydroxide, Sulfide, and Carbonate in Kraft Liquors by UV- Attenuated Total Reflection Spectroscopy," Presented at the 2000 TAPPI Pulping Conference, Boston, MA, Nov. 5-8



41. Zhu, J.Y., Yoon, S.-H., Chai, X.S., Li, J., and Malcolm, E.W., (2000), "In-Digester Odor Reduction in Kraft Pulping," Presented at the 2000 TAPPI International Environmental Conference, Denver, CO, May, 2000.



42. Chai, X.S., Li, P.H., and Zhu, J.Y., (1999), "Analysis of Volatile Organic Sulfur Compounds in Kraft Liquors by Full Evaporation Headspace Gas Chromatography," Presented at the 1999 AIChE Annual Meeting, Dallas, TX, Nov. 1-5.



43. Liu, P.H., Chai, X.S., J.T. Thomas, Zhu, J.Y., (1999) "Understanding methanol Formation During Black Liquor Storage," Presented at the 1999 AIChE Annual Meeting, Dallas, TX, Nov. 1-5.



44. Chai, X.S., and Zhu, J.Y., (1999), "A Direct and Spectrophotometric Method for On-line Pulp Kappa Number Determination" Presented at the 1999 Tappi Engineering/Process and Product Quality Conference, Anaheim, CA, Sep 12-16. ,



45. Zhu, J.Y., Liu, P.H., and Chai, X.S., (1999), "Understanding Methanol Formation in Kraft Pulp Mills", Presented at the 1999 Tappi Engineering/Process and Product Quality Conference, Anaheim, CA, Sep 12-16.



46. Zhu, J.Y., Chai, X.S., and Dhasmana, B., (1999), "Understanding Methanol Formation in Pulp Mills", Presented at the 1999 Tappi Int. Environmental Conference, Nashville, TN, April



47. Chai, X.S., Zhu, J.Y., and Li, J., (1999), "A Simple and Rapid Method to Determine Hexenuronic Acid Groups in Chemical Pulps," Presented to the 10th Int, Symp. on Wood and Pulping Chemistry, Yokohama, Japan, June



48. Chai, X.S., and Zhu, J.Y., (1999), "Rapid Pulp Kappa Number Determination Using Spectrophotometry," Presented at the 10th Int, Symp. on Wood and Pulping Chemistry, Yokohama, Japan, June



49. Liu, P.H., Chai, X.S., and Zhu, J.Y., (1998), "Further Study on Vapor Liquid Euilibrium of Methanol in Black Liquors", Presented at the 1998 AIChE Annual Meeting, Miami, FL, Nov. 15-21.



50. Chai, X.S., and Zhu, J.Y., (1998), "Multiple Headspace Extraction GC Technique and its Application on Measuring Liquid Content and Henry's Constant of VOC in Pulp Mill Streams," Presented at the 112th AOAC International Annual Meeting, Montreal, Quebec, Canada, Sept. 13-17.



51. Zhu, J.Y. and Chai, X.S., (1998), "Multiple Headspace Extraction Gas Chromatography for the Study VOC Emissions in Kraft Mills," Presented at the 22nd International Symposium on Chromatography, Rome, Italy, September.



52. Zhu, J.Y. and Chai, X.S., (1998), "The Vapor Liquid Equilibrium of Methanol in Black Liquor," Presented at the 1998 International Chemical Recovery Conference, Tampa, FL, June.



53. Zhu, J.Y., Chai, X.S., and Dhasmana, B., (1998), "Some Studies on VOC Emission in Kraft Mills," Presented at the 1998 Tappi Int. Environmental Conference and Exhibit, Vancouver, Canada, April.



54. Gu, Y.X., Barry, M., Edwards, L., Dunaway, K., Zhu, J.Y., Chai, X.S., Rovell-Rizz, D., Kirkman, A.G., (1998), "VOC Emission Models: Tuning and Validation Using Data From an ECF Kraft Mill," Presented at the 1998 Tappi Int. Environmental Conference, Vancouver, Canada, Apr.



55. Zhu, J.Y. and Chai, X.S., (1998), "Application of Headspace Gas Chromatography to Determine the Content and Henry’s Constant of VOC’s in Kraft Mill Streams," Presented at the 28th International Symposium on Environmental Analytical Chemistry – ISEAC 28, Geneva, Switzerland, March.



56. Chai, X.S., Bindu Dhasmana, and Junyong Zhu, (1997), Development of a Database for VOC Emission Prediction in Kraft Mills Using Headspace Gas Chromatography, AIChE Conference, Los Anglos, CA, November.



57. L-G Danielsson, Chai, X.S., (1996), Measurements in UV-Vis range utilizing ATR-cells, EUROANALYSIS, Bologna, Italy, Sept.



58. L-G Danielsson, Chai, X.S., (1996), On-line application of multiwavelength UV/Vis-spectrophotometry in process liquors of the pulping industry, Analytica, Munich, Germany, April.



59. L-G Danielsson, Chai, X.S., Bofeng Mao and Nils Hartler, (1996), On-line monitoring of hydrogen sulphide ions during kraft pulping, Kemistdagar in Analyisk Kemi, Stockholm, Sweden, June.



60. L-G Danielsson and Chai, X.S., (1995), On-line meaning of sulfide and polysulfide in pulp industrial liquors, Norska Analysdagar, Oslo, Norway, October.



61. L-G Danielsson and Chai, X.S., (1994) Spectroscopic measurements in opaque solutions. UV-VIS spectroscopy on process liquors in the paper and pulp industries, ANATECH’94, Mandelieu la Napoule, France, April.



62. Chai, X.S., and L-G Danielsson, (1993), Membrane based technique for the determination of sulfide species, Kemistdagar in Analyisk Kemi, Lund, Sweden, June.



63. L-G Danielsson and Chai, X.S., (1992) Monitoring Sulfur Species in the Kraft Process Using a Membrane Interface. ANATECH’92, Atlanta, GA, April.