烷基化的火灾危险性分析--章仁根的blog

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烷基化的火灾危险性分析 | 2010-12-30 7:33:00

　烷基化(亦称烃化)，是在有机化合物中的氮、氧、碳等原子上引入烷基R—的化学反应。引入的烷基有甲基(－CH3)、乙基(－C2H5)、丙基(－C3H7)、丁基(－C4H9)等。
　　烷基化常用烯烃、卤化烃、醇等能在有机化合物分子中的碳、氧、氮等原子上引入烷基的物质作烷基化剂。如苯胺和甲醇作用制取二甲基苯胺。
　　烷基化的火灾危险性：
　　(1)被烷基化的物质大都具有着火爆炸危险。如苯是甲类液体，闪点－11℃，爆炸极限1．5％～9．5％；苯胺是丙类液体，闪点71℃，爆炸极限1．3％～4．2％。
　　(2)烷基化剂一般比被烷基化物质的火灾危险性要大。如丙烯是易燃气体，爆炸极限2％～11％；甲醇是甲类液体，闪点7℃，爆炸极限6％～36．5％；十二烯是乙类液体，闪点35℃，自燃点220℃。
　　(3)烷基化过程所用的催化剂反应活性强。如三氯化铝是忌湿物品，有强烈的腐蚀性，遇水或水蒸汽分解放热，放出氯化氢气体，有时能引起爆炸，若接触可燃物，则易着火；三氯化磷是腐蚀性忌湿液体，遇水或乙醇剧烈分解，放出大量的热和氯化氢气体，有极强的腐蚀性和刺激性，有毒，遇水及酸(主要是硝酸、醋酸)发热、冒烟，有发生起火爆炸的危险。
　　(4)烷基化反应都是在加热条件下进行，如果原料、催化剂、烷基化剂等加料次序颠倒、速度过快或者搅拌中断停止，就会发生剧烈反应，引起跑料，造成着火或爆炸事故。
　　(5)烷基化的产品亦有一定的火灾危险。如异丙苯是乙类液体，闪点35．5℃，自燃点434℃，爆炸极限0．68％～4．2％；二甲基苯胺是丙类液体，闪点61℃，自燃点371℃；烷基苯是丙类液体，闪点127℃。

By:章仁根 | 阅读全文 | 回复(23) | 引用通告 | 编辑

标签：烷基化火灾危险性

Re:烷基化的火灾危险性分析 | 2010-12-30 7:35:20

分析危险性，落实防范措施，确保生产安全。

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原创 | 2016-9-6 17:55:51

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原创 | 2016-9-28 17:29:41

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原创 | 2016-9-30 12:06:01

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Re:在漫画中识别身边的违章 | 2016-10-8 14:57:17

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Re:在漫画中识别身边的违章 | 2016-10-11 3:05:01

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Re:在漫画中识别身边的违章 | 2016-10-11 4:28:10

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Re:在漫画中识别身边的违章 | 2016-10-11 14:22:32

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Re:在漫画中识别身边的违章 | 2016-10-12 12:20:16

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Re:在漫画中识别身边的违章 | 2016-10-16 17:22:57

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Re:在漫画中识别身边的违章 | 2016-10-18 2:50:49

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By:nmbei(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2016-10-19 16:41:38

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By:mbgil(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2016-10-20 0:39:35

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Re:在漫画中识别身边的违章 | 2016-10-20 20:55:53

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Re:在漫画中识别身边的违章 | 2016-10-21 0:00:28

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By:zruwz(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2016-10-22 12:47:25

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By:rgdfj(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2016-10-22 23:44:19

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By:ynsux(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2017-2-18 13:54:53

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Re:在漫画中识别身边的违章 | 2017-2-20 0:09:32

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By:zxmqu(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2017-2-20 17:14:16

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