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化学还原反应的危险性分析 | 2010-9-16 7:31:00
如硝基苯在盐酸溶液中被铁粉还原成苯胺、邻硝基苯甲醚在碱性溶液中被锌粉还原成邻氨基苯甲醚、使用保险粉、硼氢化钾、氢化锂铝等还原剂进行还原等。
  还原过程的危险性分析及防火要求:
  (1)无论是利用初生态还原,还是用催化剂把氢气活化后还原,都有氢气存在(氢气的爆炸极限为4—75),特别是催化加氢还原,大都在加热、加压条件下进行,如果操作失误或因设备缺陷有氢气泄漏,极易与空气形成爆炸性混合物,如遇着火源即会爆炸。所以,在操作过程中要严格控制温度、压力和流量;车间内的电气设备必须符合防爆要求。电线及电线接线盒不宜在车间顶部敷设安装;厂房通风要好,应采用轻质屋顶、设置天窗或风帽,以使氢气及时逸出;反应中产生的氢气可用排气管导出车间屋项,并高于屋脊2m以上,经过阻火器向外排放;加压反应的设备应配备安全阀,反应中产生压力的设备要装设爆破片;安装氢气检测和报警装置。
  (2)还原反应中所使用的催化剂雷氏镍吸潮后在空气中有自燃危险,即使没有着火源存在,也能使氢气和空气的混合物引燃形成着火爆炸。因此,当用它们来活化氢气进行还原反应时,必须先用氮气置换反应器内的全部空气,并经过测定证实含氧量降到标准后,才可通人氢气;反应结束后应先用氮气把反应器内的氢气置换干净,才可打开孔盖出料,以免外界空气与反应器内的氢气相遇,在雷氏镍自燃的情况下发生着火爆炸,雷氏镍应当储存于酒精中,钯碳回收时应用酒精及清水充分洗涤,过滤抽真空时不得抽得太干,以免氧化着火。
  (3)固体还原剂保险粉、硼氢化钾、氢化铝锂等都是遇湿易燃危险品,其中保险粉遇水发热,在潮湿空气中能分解析出硫,硫蒸气受热具有自燃的危险,且保险粉本身受热到190也有分解爆炸的危险;硼氢化钾()在潮湿空气中能自燃,遇水或酸即分解放出大量氢气,同时产生高热,可使氢气着火而引起爆炸事故;氢化锂铝是遇湿危险的还原剂,务必要妥善保管,防止受潮。保险粉用于溶解使用时,要严格控制温度,可以在开动搅拌的情况下,将保险粉分批加入水中,待溶解后再与有机物接触反应;当使用硼氢化钠()作还原剂时,在工艺过程中调解酸、碱度时要特别注意,防止加酸过快、过多;当使用氢化铝锂作还原剂时,要特别注意,必须在氮气保护下使用,平时浸没于煤油中储存。前面所述的还原剂,遇氧化剂会猛烈发生反应,产生大量热量,具有着火爆炸的危险,故不得与氧化剂混存。
  (4)还原反应的中间体,特别是硝基化合物还原反应的中间体,亦有一定的火灾危险,例如,在邻硝基苯甲醚还原为邻氨基苯甲醚的过程中,产生氧化偶氮苯甲醚,该中间体受热到150能自燃。苯胺在生产中如果反应条件控制不好,可生成爆炸危险性很大的环己胺。所以在反应操作中一定要严格控制各种反应参数和反应条件。
(5)
开展技术革新,研究采用危险性小、还原效率高的新型还原剂代替火灾危险性大的还原剂。例如采用硫化钠代替铁粉还原,可以避免氢气产生,同时还可消除铁泥堆积的问题。 
 
 

Re:化学还原反应的危险性分析 | 2010-9-16 7:33:40
章仁根分析化学还原反应的危险性,采取措施认真预防,杜绝事故发生.
By:章仁根 | 个人主页 | 引用 | 返回 | 删除 | 回复
原创 | 2016-9-6 17:56:42
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原创 | 2016-9-28 17:30:33
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原创 | 2016-9-30 12:06:56
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Re:在漫画中识别身边的违章 | 2016-10-10 20:52:47
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Re:在漫画中识别身边的违章 | 2016-10-11 15:11:31
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Re:在漫画中识别身边的违章 | 2016-10-14 2:58:28
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Re:在漫画中识别身边的违章 | 2016-10-14 19:22:01
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Re:在漫画中识别身边的违章 | 2016-10-16 2:03:12
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Re:在漫画中识别身边的违章 | 2016-10-16 17:02:12
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Re:在漫画中识别身边的违章 | 2016-10-17 6:48:01
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Re:在漫画中识别身边的违章 | 2016-10-18 1:44:13
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Re:在漫画中识别身边的违章 | 2016-10-20 16:58:07
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Re:在漫画中识别身边的违章 | 2016-10-22 7:13:06
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Re:在漫画中识别身边的违章 | 2016-10-23 4:57:53
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Re:在漫画中识别身边的违章 | 2017-2-18 22:39:49
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By:odgko(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 | 2017-3-4 14:33:43
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