第 37 卷第 6 期 |  | Vol. 37 No. 6 | 2007 年 12 月 | Dec 2007 |
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所屬欄目:染料、顏料及涂料
改性骨架鎳催化鄰硝基氯苯加氫制備2,2-二氯氫化偶氮苯 |
王 歡,梅 華,姚虎卿
(南京工業(yè)大學(xué) 化學(xué)化工學(xué)院,江蘇 南京210009) |
摘 要:通過(guò)對骨架鎳催化劑添加第三金屬M(Mo,Ti,Cr)制備改性骨架鎳催化劑,并采用間歇加壓釜式反應器對改性骨架鎳催化劑進(jìn)行活性評價(jià),考察了不同添加金屬、反應壓力、溫度、堿量、催化劑循環(huán)套用次數等工藝條件對催化加氫法制備2,2'-二氯氫化偶氮苯的影響。實(shí)驗得到優(yōu)惠的反應條件為:使用Mo-Ni-Al改性骨架鎳催化劑,反應溫度350 K,反應壓力0.8 MPa,30%的氫氧化鈉溶液40 mL。鄰氯硝基苯的轉化率達99.5%,2,2'-二氯氫化偶氮苯的收率可達90.5%。同時(shí)催化劑循環(huán)套用5次后其催化活性基本保持不變。結果表明,改性骨架鎳催化劑較之普通骨架鎳催化劑的活性、選擇性及穩定性都有明顯的提高,具有良好的工業(yè)應用前景。 |
關(guān)鍵詞:改性骨架鎳;催化加氫;循環(huán);2,2'-二氯氫化偶氮苯 |
中圖分類(lèi)號:O643 文獻標識碼:A 文章編號:1009-9212(2007)06- 0048-04 |
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Catalytic Hydrogenation for o-Chloronitrobenzene(o-CNB) Preparation of 2,2'-Dichlorohydrazobenzene(DHB)with Modified Skeletal Ni Catalyst |
WANG Huan,MEI Hua,YAO Hu-qing
(College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China) |
Abstract:Modified skeletal Ni catalyst was prepared by the addition of the third metal (Mo,Ti,Cr) on normal Skeletal Ni catalyst. The catalyst performance for the hydrogenation was evaluated in an autoclave reactor. The different addition metal,temperature,pressure,the dosage of sodium hydroxide,catalyst recycle times were investigated in hydrogenation of o-CNB to DHB. Under the optimal reaction conditions of temperature 350 K,pressure 0.8 MPa,Mo-Ni-Al modified skeletal Ni catalyst and 40 mL 30% sodium hydroxide. The o-CNB conversion exceeded 99.5% and the selectivity for DHB exceeded 90.5%. The catalytic activity of the modified skeletal Ni catalyst keeps the same level after recycling five times. The activities,catalytic selectivity,catalytic stability of catalyst are appreciably increasing,suggesting that the modified skeletal Ni catalyst has good industrial prospect. |
Key words:modified skeletal Ni;catalytic hydrogenation;recycle;2,2'-dichlorohydrazobenzene |
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基金項目:江蘇省高技術(shù)研究重大項目(BG2006041)。
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作者簡(jiǎn)介:王 歡(1983-),男,江蘇吳江人,碩士研究生,從事催化分離研究。(E-mail:wanghuangiggs@163.com)
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收稿日期:2007-09-30
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