頁籤選單縮合
題名 | 芳香烴萃取工場之貧溶劑提純研究=A Study of the Purification of Lean Solvent in Aromatics Extraction Unit |
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作者 | 柯經緯; 陳萬容; 賴宗成; 蔡銘璋; 薛虹紅; 莊秀淓; 黃正彥; 袁煥屏; 李明禮; 陳維德; Ko, Jing-wei; Chen, Wan-rong; Lai, Zong-cheng; Tsai, Ming-chang; Xue, Hong-hong; Chuang, Shiou-fang; Huang, Zheng-yan; Yuan, Huan-ping; Li, Ming-li; Chen, Wei-de; |
期刊 | 石油季刊 |
出版日期 | 20170300 |
卷期 | 53:1 2017.03[民106.03] |
頁次 | 頁71-80 |
分類號 | 460.02 |
語文 | chi |
關鍵詞 | 萃取; 蒸餾; 溶劑; Extraction; Distillation; Sulfolane; |
中文摘要 | 第七芳香烴工場的BTX 進料主要有四輕、新三輕製程產生的芳香烴進料油,七芳工場之萃取蒸餾塔(V-7001)使用對芳香烴具有親和力的高沸點溶劑(Sulfolane、3 Methyl Sulfolane),降低芳香烴的活性係數,提昇非芳香烴的活性係數,蒸餾時塔頂萃餘油大多為非芳香烴,而塔底萃取油只含有溶劑及芳香烴;萃取油經溶劑回收塔(V-7002)將溶劑與芳香烴產品分離。當貧溶劑中高碳數非芳香烴的含量多時,無法有效降低芳香烴的活性係數與提昇非芳香烴的活性係數,使萃取蒸餾塔之分離效率降低,造成能耗增加。七芳工場從102 年8 月開俥投產,103 年1 月起貧溶劑中高碳數非芳香烴的含量由10%逐漸累積至18%,使萃取蒸餾塔之分離效率降低。林園廠與煉研所共同討論移除貧溶劑中高碳數非芳香烴的之方法,並在實驗室進行實驗,確認可行後,林園廠技術組與煉研所共同規劃流程,104 年1月林園廠完成施工;104 年2 月開始進行貧溶劑中之提純作業,將高碳數非芳香烴移除,至104 年12 月止,貧溶劑中Sulfolane 與3 Methyl Sulfolane 之濃度由82%提昇至90%以上,最高可達98%。由PI 取得之數據,貧溶劑提純前(103 年1 月至104 年1 月) 再沸器使用水蒸氣總流量之平均為61,645 Kg/h;貧溶劑提純後(104 年2 月至104 年12 月) 再沸器使用水蒸氣總流量之平均為53,537 Kg/h。貧溶劑提純前(103 年1 月至104 年1 月),每公秉七芳進料流量之再沸器使用水蒸氣流量之平均為825 Kg;貧溶劑提純後(104 年2 月至104 年12 月),每公秉七芳進料流量之再沸器使用水蒸氣流量之平均為519.8 Kg。 |
英文摘要 | The feedstocks of No.7 Aromatic Extraction Unit are aromatic oil coming from No.4 Naphtha Cracking Unit and New No.3 Naphtha Cracking Unit. The extractive distillation column utilizes high boiling point solvents (Sulfolane、3 methyl Sulfolane) that are capable of the affinity to aromatic hydrocarbons, which reduce the activity coefficient of aromatic hydrocarbons and enhance the activity coefficient of non-aromatic hydrocarbons. The raffinate from top of the column is non-aromatic hydrocarbons. The extract from bottom of the column is solvent and aromatic hydrocarbons. The extract is separated at the solvent recovery column (V-7002) to obtain the solvent at the bottom and aromatic hydrocarbons at the top. As the lean solvent contains too many aromatic hydrocarbons, it cannot reduce the activity coefficient of aromatic hydrocarbons and enhances the activity coefficient of non-aromatic hydrocarbons effectively Thus, the separation efficiency of the extractive distillation column is reduced and the energy consumption is increased. No.7 Aromatic Extraction Unit started up in Aug. 2013. The content of heavier nonaromatic hydrocarbons is from 10% going up to 18% gradually from Jan. 2014. The separation efficiency of the extractive distillation column dropped significantly. The staffs of Lin-yuan plant and RMRI discussed the way to remove the heavier nonaromatic hydrocarbons contained in lean solvent. After having performed the experiment in the laboratory, the way to remove the heavier non-aromatic hydrocarbons contained in lean solvent has to be verified. The staffs of Lin-yuan plant and RMRI planned together on the flow sheet of the removing of heavier non-aromatics contained in lean solvent. The Lin-yuan plant completed the revamping work in Jan. 2015. The removing operation of the heavier non-aromatic hydrocarbons contained in lean solvent started from Feb. 2015 to Dec. 2015. The content of sulfolane and 3 methyl Sulfolane contained in lean solvent is from 82% to 98% during the removing operation. The average flow rate of the total heating steam of reboiler is 61,645 Kg/h before the purifying procedure of lean solvent (from Jan. 2014 to Jan. 2015). The average flow rate of the total heating steam of reboiler is 53,537 Kg/h after the purifying procedure of lean solvent (from Feb. 2015 to Dec. 2015). The average flow rate of the total heating steam of reboiler per KL feedstock is 825 Kg before the purifying procedure of lean solvent (from Jan. 2014 to Jan. 2015). The average flow rate of the total heating steam of reboiler per KL feedstock is 519.8 Kg after the purifying procedure of lean solvent (from Feb. 2015 to Dec. 2015). |
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