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Effects of silica on chemical recovery in the direct causticization of wheat straw black liquor
Yuan, Hongyou3,4; Wu, Shubin1; Yin, Xiuli2; Guo, Daliang2; Wang, Guijin2; Zhou, Zhaoqiu2; Wu, Chuangzhi2
2016-08-01
发表期刊TAPPI JOURNAL
卷号15期号:8页码:557-566
摘要Straw black liquor is relatively difficult to recover using the Tomlinson process because of the presence of silica in inorganic components. Gasification with direct causticization might serve as a promising alternative; however, the interaction between silica and direct causticization agents needs to be evaluated. In this work, desilication was achieved using a laboratory-scale membrane electrolysis cell adopted from the chlor-alkali industry. Then raw and desilicated straw black liquors were carried out through direct causticization with titanium dioxide (TiO2) and recycled sodium tri-titanate (Na2O center dot 3TiO(2)) at 850 degrees C using a tube furnace. The results show that these two agents exhibit different silica transfer mechanisms. When using TiO2, approximately 80% of the silica is retained in the solid residue after hydrolysis because of chemical interactions. Almost all of the silica transfers to the hydrolysis-derived white liquor when using Na2O center dot 3TiO(2). This means that the process of treating straw black liquor by direct causticization might need additional lime causticization to improve the efficiency of sodium recovery. This observation also indicates that silica will not consume the direct causticization agent Na2O center dot 3TiO(2) after the initial step using TiO2. The sodium hydroxide (NaOH) yield was 60% when using raw black liquor as the feed to the Na2O center dot 3TiO(2) recycling tests and 80% when using desilicated straw black liquor. Considering the NaOH recovered in the electrolysis cell, the total NaOH yields exceed 85% of total titratable alkali. No detectable deterioration of the direct causticization agents was found within the limited number of recycles tested. A greater number of cycles need to be tested at a larger scale to evaluate the feasibility of applying a direct causticization process to straw black liquor.
文章类型Article
WOS标题词Science & Technology ; Technology
资助者National Natural Science Foundation of China (NSFC)(51506206 ; National Key Basic Research Program of China(2013CB228101) ; 51176195) ; National Natural Science Foundation of China (NSFC)(51506206 ; National Key Basic Research Program of China(2013CB228101) ; 51176195)
研究领域[WOS]Materials Science
关键词[WOS]PRODUCT GAS-COMPOSITION ; TITANIUM-DIOXIDE ; RICE STRAW ; AUTOCAUSTICIZATION PROCESS ; HYDROGEN-PRODUCTION ; SODIUM TRITITANATE ; GASIFICATION ; LIGNIN ; REACTOR ; ELECTROLYSIS
收录类别SCI
语种英语
资助者National Natural Science Foundation of China (NSFC)(51506206 ; National Key Basic Research Program of China(2013CB228101) ; 51176195) ; National Natural Science Foundation of China (NSFC)(51506206 ; National Key Basic Research Program of China(2013CB228101) ; 51176195)
WOS类目Materials Science, Paper & Wood
WOS记录号WOS:000382526800006
引用统计
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/11911
专题中国科学院广州能源研究所
作者单位1.South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangdong Key Lab New & Renewable Energy, Guangzhou, Guangdong, Peoples R China
3.South China Univ Technol, Guangzhou, Guangdong, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou, Guangdong, Peoples R China
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Yuan, Hongyou,Wu, Shubin,Yin, Xiuli,et al. Effects of silica on chemical recovery in the direct causticization of wheat straw black liquor[J]. TAPPI JOURNAL,2016,15(8):557-566.
APA Yuan, Hongyou.,Wu, Shubin.,Yin, Xiuli.,Guo, Daliang.,Wang, Guijin.,...&Wu, Chuangzhi.(2016).Effects of silica on chemical recovery in the direct causticization of wheat straw black liquor.TAPPI JOURNAL,15(8),557-566.
MLA Yuan, Hongyou,et al."Effects of silica on chemical recovery in the direct causticization of wheat straw black liquor".TAPPI JOURNAL 15.8(2016):557-566.
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