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对氨基二苯胺的生产与发展 总被引:3,自引:0,他引:3
梁诚 《四川化工与腐蚀控制》2001,4(6):32-36
介绍了对氨基二苯胺国内生产现状,市场需求及发展趋势,目前世界对氨基二苯胺生产正由对硝基氯苯为原料向硝基苯法转变。近年来我国橡胶助剂工业的快速发展大大增加了对氨基二苯胺市场需求量。但与国外先进水平相比仍存在差距,就此提出一些发展建议。 相似文献
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《化工经济技术信息》2008,(11)
目前,对氨基二苯胺的工业化生产方法主要有4种,即苯胺法、二苯胺法、甲酰苯胺法和硝基苯法。苯胺法过程简单,成本低,但是反应温度高、副反应多、产品质量差,目前只有德国拜耳公司等极少数企业采用该法进行生产;二苯胶法主要以二苯胺为原料,在无机酸存在下,于有机溶剂中用亚硝酸盐进行亚硝化,得到N-亚硝基二苯胺,再用无水氯化氢进行重排生成4-亚硝基二苯胺盐酸盐, 相似文献
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前言2,4-二氟苯胺是合成医药二氟苯水杨酸的重要中间体。二氟苯水杨酸是一种新型非甾体消炎镇痛药。该药消炎镇痛作用强,药效持久,毒性低,是较有发展前途的消炎镇痛药。70年代进入国外药典,现已有20多个国家在批量销售。上海五洲药厂正在进行研 相似文献
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4-氨基二苯胺的合成研究 总被引:3,自引:0,他引:3
采用二苯胺法,用复合骨架镍为催化剂,在中低压条件下加氢还原制备4-氨基二苯胺.文章对加氢反应进行了重点研究,考察了催化剂及其用量、温度、压力以及物料浓度对加氢反应的影响.优惠条件下的稳定性实验表明:催化剂活性稳定,加氢反应的转化率稳定在99.5%以上,4-氨基二苯胺的收率稳定在95%以上.该实验结果对开发4-氨基二苯胺新工艺具有重要意义. 相似文献
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综述了合成 4 氨基二苯胺 (RT培司 )的传统工艺方法 ,从合成条件、环保、生产成本这三方面对工艺进行了评价。从硝基苯和苯胺直接合成 4 氨基二苯胺是当前一种较为理想的方法。 相似文献
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In-situ infrared study of polyaniline (PANI) synthesis showed that the reaction initiated at pH = 1.5 produced a granule PANI microstructure via para-linked dimers of 4-aminodiphenylamine, exhibiting γ(C–H) at 802 cm?1; the reaction initiated at pH = 5.0 and 7.0 produce fiberous, and planar microstructures via ortho-linked dimers of 1,2-aminodiphenylamine and phenazine, exhibiting γ(C–H) at 738 and ν(C=N) at 1446 cm?1. The doped PANI that was produced at pH less than 5.0 showed a feature-less IR background absorption above 1600 cm?1. This absorption could correspond to π-electron delocalization as an indicative of polyaniline conductivity. 相似文献
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In-situ infrared study of polyaniline (PANI) synthesis showed that the reaction initiated at pH = 1.5 produced a granule PANI microstructure via para-linked dimers of 4-aminodiphenylamine, exhibiting γ(C–H) at 802 cm−1; the reaction initiated at pH = 5.0 and 7.0 produce fiberous, and planar microstructures via ortho-linked dimers of 1,2-aminodiphenylamine and phenazine, exhibiting γ(C–H) at 738 and ν(C=N) at 1446 cm−1. The doped PANI that was produced at pH less than 5.0 showed a feature-less IR background absorption above 1600 cm−1. This absorption could correspond to π-electron delocalization as an indicative of polyaniline conductivity.
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The effect of the protonation on electropolymerization of aniline was elucidated theoretically. It was shown that the proton effects stabilities of p-aminodiphenylamine which is the primary species formed following electrooxidation in acidic media. The position of protonation is elucidated. Geometrical optimizations and calculated energies (strain and total energy and heat of formation) and proton affinity values predict that the p-aminodiphenylamine is preferably protonated on the amine nitrogen between the phenyl rings. It is concluded that the polymer backbone is relaxed and the strained structure is removed upon stepwise protonation during the growth of the polymer. 相似文献
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介绍防老剂4030和4050等防护体系助剂,促进剂TBSI和TBZTD、抗硫化返原剂Perkalink900等硫化体系助剂,以及塑解剂、均匀剂、间苯二酚树脂等加工助剂的开发和应用。综述对氨基二苯胺硝基苯法工艺、混合胺合成防老剂DTPD工艺、噻唑类促进剂清洁工艺等进展。我国橡胶助剂工业应不断科技创新,才能够做大做强。 相似文献