第 39 卷第 3 期 |  | Vol. 39 No. 3 | 2009 年 6 月 | Jun 2009 |
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所屬欄目:農藥及中間體
2-氯-6-三氯甲基吡啶的制備研究 |
陳朝輝,胡曉珊
(湖南國發(fā)精細化工科技有限公司,湖南 岳陽(yáng) 414013) |
摘 要:采用等質(zhì)量混合的三乙醇胺與過(guò)氧化苯甲酰作為催化劑,在管式反應器中2-甲基吡啶鹽酸鹽(MPCH)與氯氣反應合成了2-氯-6-三氯甲基吡啶(NP),研究了催化劑用量、反應原料、原料配比、加料速率和反應溫度對氯化產(chǎn)物中NP含量及制備過(guò)程收率的影響。優(yōu)化反應條件為:采用MPCH作原料,m(催化劑) ∶ m(2-甲基吡啶)=0.01 ∶ 1,n(Cl2) ∶ n(MPCH)=6 ∶ 1,反應溫度為180~190℃,MPCH和氯氣的較佳進(jìn)料速率分別為15 g/h和49.4 g/h,此時(shí)氯化產(chǎn)物中NP的含量可達78.5%,制備過(guò)程收率達93.4%。氯化反應NP選擇性高,工藝簡(jiǎn)單,易于實(shí)現工業(yè)化。 |
關(guān)鍵詞:2-氯-6-三氯甲基吡啶;氯氣;2-甲基吡啶;氯化;管式反應器 |
中圖分類(lèi)號:TQ253.21 文獻標識碼:A 文章編號:1009-9212(2009)03- 0021-04 |
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A Study on the Preparation of 2-Chloro-6-(trichloromethyl)pyridine |
CHEN Zhao-hui,HU Xiao-shan
(Hunan Guofa Fine Chemicals and Technology Co.,Ltd.,Yueyang 414013,China) |
Abstract:2-Chloro-6-(trichloromethyl)pyridine(NP) was prepared by chlorination of 2-methylpyridine hydrochloride(MPCH)with Cl2 in a gas-liquid countercurrent tubular reactor. A mixture of triethanolamine and benzoylperoxide with identical concentration was used as catalyst. The optimum reaction conditions were as follows: m(Catalyst) ∶ m(MP)= 0.01 ∶ 1, n(Cl2) ∶ n(MPCH)= 6 ∶ 1, reaction temperature 180~190℃, feed rates of MPCH 15 g/h and of Cl2 49.4 g/h. Under optimal conditions, the content of NP in chlorination products and the yield of NP reached 78.5% and 93.4%, respectively. |
Key words:2-chloro-6-(trichloromethyl)pyridine;chlorine;2-methylpyridine;chlorination;tubular reactor |
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作者簡(jiǎn)介:陳朝輝(1968-),男,湖南臨湘人,工程師,從事農藥及精細化工中間體合成及生產(chǎn)研究。(E-mail:czh19680520@qq.com)
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收稿日期: 2008-05-0
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