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1.发明公开
公开(公告)号：EP1175611A1
公开(公告)日：2002-01-30
申请号：EP00916711.5
申请日：2000-04-04
IPC分类号： G01N21/35
CPC分类号： G01N21/359 , G01N21/3577
摘要： A method for determining the concentration of hydrogen ion, organic anionic species and anionic species selected from the group consisting of OH-, CO3?=, HS-, ClO¿3-, SO4=, S2O3=, polysulphide and peroxide in an aqueous sample solution, said method comprising subjecting said solution to near infrared radiation at a wavelength region of wave numbers selected from about 7,000 to 14,000 cm-1 through a solution path length of at least 3 mm to obtain spectral data for said solution; obtaining comparative spectral data for said anionic species at known concentrations in aqueous solutions; and correlating by multivariate calibration the relationships between said spectral data of said sample solution and said comparative spectral data to determine said concentration of said anionic species in said sample solution. The method is of particular value for use with pulp liquor determination and control.
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2.发明公开DETERMINATION OF SODIUM SULFIDE AND SULFIDITY IN GREEN LIQUORS AND SMELT SOLUTIONS 失效硫化钠和硫化在绿色长测定及熔体解决方案
公开(公告)号：EP0850415A1
公开(公告)日：1998-07-01
申请号：EP96929152.0
申请日：1996-09-09
发明人： LECLERC, Denys, F.
CPC分类号： G01N21/359 , D21C7/12 , D21C11/0064 , G01N21/3577 , G01N33/343 , Y10S162/10
摘要： A rapid method is provided for the on-line determination of sodium sulfide concentration and/or percent sulfidity in green liquors or smelt solutions used for the production of either kraft or sulfite pulp. The method eliminates manual sampling, and the need for frequent equipment maintenance. The method includes the steps of withdrawing samples of a smelt solution or green liquor from the kraft or sulfite manufacturing process, subjecting the samples to near-infrared spectrophotometry over a predetermined range of wave numbers so as to produce absorbance measurements relative to a reference spectrum of either water or a caustic soda-sodium carbonate solution, determining the absorbance shown by different combinations of sodium sulfide, sodium hydroxide, sodium carbonate and sodium chloride concentrations, correlating by multivariate calibration the relationships between the absorbance measurements of unknown samples and the absorbance shown by different combinations of sodium sulfide, sodium hydroxide, sodium carbonate and sodium chloride so that the amount of sodium sulfide and/or the percent sulfidity can be accurately determined for any levels of TTA or chloride present in the liquor.
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3.发明授权
公开(公告)号：EP1031023B1
公开(公告)日：2004-07-14
申请号：EP98952463.2
申请日：1998-11-03
IPC分类号： G01N21/35
CPC分类号： G01N21/359 , G01N21/3577
摘要： A method for determining the concentration of anionic species selected from the group consisting of OH , CO3 and HS and of organic species in an aqueous sample solution, said method comprising subjecting said solution to near infrared radiation at a wavelength region of wave numbers selected from about 7,000 to 14,000 cm through a solution path length of at least 3 mm to obtain spectral data for said solution; obtaining comparative spectral data for said anionic species at known concentrations in aqueous solutions; and correlating by multivariate calibration the relationships between said spectral data of said sample solution and said comparative spectral data to determine said concentration of said anionic species in said sample solution. The method is of particular value for use with pulp liquor determination and control in regards to the rapid and accurate determination of the OH , HS and CO3 anionic species and of organic species present in pulp liquor.
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4.发明授权
公开(公告)号：EP0850415B1
公开(公告)日：2001-04-04
申请号：EP96929152.5
申请日：1996-09-09
发明人： LECLERC, Denys, F.
CPC分类号： G01N21/359 , D21C7/12 , D21C11/0064 , G01N21/3577 , G01N33/343 , Y10S162/10
摘要： A rapid method is provided for the on-line determination of sodium sulfide concentration and/or percent sulfidity in green liquors or smelt solutions used for the production of either kraft or sulfite pulp. The method eliminates manual sampling, and the need for frequent equipment maintenance. The method includes the steps of withdrawing samples of a smelt solution or green liquor from the kraft or sulfite manufacturing process, subjecting the samples to near-infrared spectrophotometry over a predetermined range of wave numbers so as to produce absorbance measurements relative to a reference spectrum of either water or a caustic soda-sodium carbonate solution, determining the absorbance shown by different combinations of sodium sulfide, sodium hydroxide, sodium carbonate and sodium chloride concentrations, correlating by multivariate calibration the relationships between the absorbance measurements of unknown samples and the absorbance shown by different combinations of sodium sulfide, sodium hydroxide, sodium carbonate and sodium chloride so that the amount of sodium sulfide and/or the percent sulfidity can be accurately determined for any levels of TTA or chloride present in the liquor.
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