pt%2fc催化加氢合成2-甲基-4-甲氧基苯胺的研究.pdf

摘要 Pt/ ,广泛应用于染料、医药、橡胶以及农用化学品等行业。。。采用浸渍法制备了Pt/C催化剂,,考察了反应条件、,结果表明浸渍法制备的3%Pt/C催化剂用于邻硝基甲苯液相催化加氢反应,在50℃、常压条件下邻硝基甲苯的转化率可达lOO%,。%,经减压蒸馏 %。初步探究了催化剂失活原因并采用BET、Ⅺm、Ⅺ谭等表征手段对催化剂的比表面积、晶体结构、活性组分含量等进行了表征,发现导致催化剂在循环使用中失活的毒物可能是反应过程中现场生成的中间产物,并提出了相应的机理来解释催化剂的失活与再生。发现用甲醇洗涤等后处理操作步骤可以使催化剂连续循环使用25次以上,稳定性良好, 。关键词:2一甲基一4一甲氧基苯胺,催化加氢,稳定性,失活,再生 ABSTRACT Synthesis of2一methyl一4一methoxylaniline By Pt/C Catalytic Hydrogenation AB STRACT 2一methyl一4一metho)【ylaniline is an important intemediate in fine chemical industries and mainly used for the synthesis of dyes, phamaceuticals, rubbers and agricultural chemicals. 2-methyl一4一methoxylaniline was mainly synthesized by catalytic hydrogenation witho—nitmtoluene using anoblemetalcatalyst. Thispaper introduced anew method aiming toimproVe mestabili够of Pt,,C in the hydmgenation cycles for the synthesis of 2一methyl一4一methoxylaniline, and tIlusreduced the cost ofcatalytic hydrogenation catalyst waS prepared by impregnation efrectsof rawmaterials ratio,reactiontemper咖re,ca协lysts on me converSion of o—nitrotoluene and the selectiVity of 2一methyl一4一methoxylaniline were inVestigated under latm was found that3%Pt/℃catalyst waS suita【 deactiVation mechanism ofcatalyst waS explored by BET,XItD,XRF deactiVation ofP们mi曲t becausedby regeneratiVe catalyst which was rinsedwitllmethanol showed obViously higherstabili够in thehydrogenation cycles,and the cost forthesynthesis of2-methyl一4一methoxylaniline wasgreatly reduCed. KEY WoRDS: 2一methyl一4一methoxylaniline, catalytic hydrogenation, stal)ili劬deactiVation,regeneration 第一章文献综述 ,随着染料工业的不断发展,染料的用途已从传统的纤维织物、食品、皮革、轻工产品、涂料等基础领域发展到信息记录、医疗诊断、能量变换、生物工业