http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Qingxi Hou,Xin-sheng Chai,Junyong Zhu 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-
This paper reports an improved headspace gas chromatographic method for the determination of carboxyl group content in wood fibers. Pretreatment of wood fibers was applied using dilute HCl to convert carboxyl groups to carboxylic acid groups and then using deionized water to wash fiber samples thoroughly. The samples were finally air dried. Sodium bicarbonate solution was used to react with carboxylic acid groups of the pretreated fibers in a closed testing vial to release carbon dioxide. The content of carboxyl groups in fibers was accurately quantified by determining the amount of carbon dioxide released by a headspace gas chromatograph equipped with a thermal conductivity detector. The modified process for fiber sample pretreatment increased the reliability and accuracy in measuring carboxylic acid groups. The present method is simple, accurate.
Dandan Zhou,Qingxi Hou,Wei Liu,임효례 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
A headspace gas chromatography (HS-GC) method is developed for determination of formic acid (FA) andacetic acid (AA) in biomass hydrolysate. The method is based on the “in-vial” derivatization reaction ofalcohols and acids. NaHSO4/ethanol is selected as the preferred derivatization reagent. The method has areproducibility of RSD <0.87% and recovery of 97.1%–103.1%. The limits of the quantification were2.02 and 2.38 mg/L for FA and AA, respectively. The GC analysis time only required 12.4 min. The methodis rapid, sensitive and suitable for measuring FA and AA in the multifarious biomass hydrolysates inpulping and biorefinery industries.
Huan Zhao,Yimei Hong,Qingxi Hou,Wei Liu,Yang Li,Fang Tong 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The surface infrared spectra of coated paper with different levels of calcium carbonate and SB-latex in the coating layer were measured using ATR-FTIR. The relations between different levels of CaCO3 and SBlatex and their respective characteristic peak areas were then established. The results show that the general regression neural network (GRNN) model can be used to estimate the CaCO3 and SB-latex contents in coatings of coated papers. The maximum errors for calcium carbonate and SB-latex were only 3.32% and 3.39%, respectively, and occurred under conditions that are at the extreme of what might be encountered in an actual production facility.
Song Han,Wei Liu,Shaoshuai Wu,Zhaoxia Long,Qingxi Hou 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Effects of four different kinds of industrial grade MgO as one alkali source in the alkaline peroxidebleaching of poplar chemi-thermomechanical pulp (CTMP) were investigated. The particle size andactivity of the MgO played the most important role in the improvement of optical and strengthproperties of the bleached CTMP. At a 25% substitution percentage of MgO for NaOH, a 77.4%ISObrightness and the optimal tensile index of the bleached CTMP could be obtained. When industrial gradeMgO was applied, appropriate increase in Na2SiO3 dosage and pulp consistency could improve thebrightness and strength properties of the bleached CTMP.