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| Study on the Composition and Evaporation Characteristics of Pulping Black Liquor |
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| DOI：10.11981/j.issn.1000-6842.2018.02.35 |
| Key Words:alkaline pulping process; pulping black liquor; component analysis; evaporation |
| Fund Project:林业公益性行业科研专项经费（201504610）。 |
| Author Name | Affiliation | | LIU Xian-miao1 | 1.International Centre for Bamboo and Rattan， Beijing，100102 | | ZHANG Jun-yi2 | 2. Qingdao Institute of Bioenergy and Bioprocess Technology， Chinese Academy of Sciences， Qingdao， Shandong Province， 266100 | | ZHANG Bo2 | 2. Qingdao Institute of Bioenergy and Bioprocess Technology， Chinese Academy of Sciences， Qingdao， Shandong Province， 266100 | | LIU Xiu-yun2 | 2. Qingdao Institute of Bioenergy and Bioprocess Technology， Chinese Academy of Sciences， Qingdao， Shandong Province， 266100 | | CHEN Xiu-fang2,* | 2. Qingdao Institute of Bioenergy and Bioprocess Technology， Chinese Academy of Sciences， Qingdao， Shandong Province， 266100 |
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| Abstract: |
| Qualitative and quantitative analyses of the compositions of pulping black liquor were carried out by using elemental analyzer， X-ray diffraction （XRD）， Energy Dispersive Spectrometry （EDS） and Ion Chromatography （IC）， etc. In addition， evaporation characteristics of the black liquor were also investigated. The results of the elemental analysis showed that nitrogen， carbon， hydrogen and sulfur were included in the solid of pulping black liquor after evaporation. According to XRD results， inorganic compounds in calcined black liquor were mainly Na2SiO3，KCl， MgSO4， CaSO4. EDS results further confirmed the existent of elements such as sodium， potassium， calcium， oxygen， sulfur， chlorine and silicon in the calcined black liquor. The study of evaporation characteristics of black liquor showed that under vacuum condition, the evaporation rate increased and the volume of condensing liquid decreased as elevating the temperature and prolonging the time, respectively. Although the decrease rates of the volume of the condensing liquid under different temperatures were different under vacuum， the time required to dry out was similar. Therefore， lower evaporation temperature （40～60℃） under vacuum could be used to save the cost of pulping black liquor treatment. The results of evaporating experiment under vacuum showed that the compositions of the condensate were similar under different temperature which were mainly alcohols such as propyl alcohol and propylene glycol. |
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