【作者】 杨梅；

【导师】 陈志荣；

【作者基本信息】 浙江大学 ， 化学工程， 2008， 硕士

【摘要】 邻苯基苯酚是重要的新型精细化工产品和有机中间体，广泛应用于杀菌防腐、印染助剂和表面活性剂、合成新型塑料、树脂和高分子材料的稳定剂和阻燃剂、合成新型药物等领域。由于市场需求量的不断扩大，国内外的研究者纷纷进行研究。目前，多数研究者把重点放在环已酮缩合脱氢制备邻苯基苯酚的工艺上。本文以环已酮二聚物为原料，通过催化脱氢得到目标产物邻苯基苯酚，研究重点在于脱氢催化剂体系的选择与优化。催化剂性能的评价是在自建的固定床反应器中进行的。本文研究了三类助催化剂K₂SO₄和KOH、MgO、镁铝复合物对脱氢催化剂性能的影响，并且发现KOH和K₂SO₄改性的催化剂具有最高的脱氢活性，MgO和镁铝复合物改性的催化剂具有更好的稳定性，同时都可保证OPP的选择在80％以上。总体上来说，镁铝复合物对催化剂改性的制备工艺是最优的。本文研究了K₂SO₄和KOH的用量对催化剂性能的影响，得出随着碱用量的增加催化剂活性下降的规律。并且在高活性催化剂的基础上，本文通过调节停留时间和CS₂对催化剂预中毒的方式，在降低初始活性的基础上，提高了催化剂的稳定性，反应5hr后，OPP选择性仍可保持在81％以上。同时，本文还比较了过量浸渍与等体积浸渍两种不同制备方法对催化剂的影响，得出过量浸渍制备的催化剂具有更高的脱氢活性。本文还通过实验设计给出了该体系的反应网络。本文研究了MgO的用量对催化剂性能的影响，得出在w（Mg）=3．75％时，催化剂具有最好的选择性和稳定性。当镁铝复合物对催化剂改性时，得出w（Mg+Al）=3．22％，w（Mg）：w（Al）=3．2：1时，催化剂具有更好的稳定性。本文还发现，Mg化合物改性的催化剂比K化合物改性的催化剂更有利于降低联苯的含量，这对于本反应体系是有利的。更多还原

【Abstract】 Ortho-phenylphenol is an important new type of fine chemical product and organic intermediate, widely used in anti-corrosion sterilization, auxiliaries and surfactant, synthesis of new plastic, resin and polymer stabilizers and flame retardants, synthesis of new drugs, and other fields. Manufacturing Ortho-phenylphenol from cyclohexanone has been widely developed because of its cheapness, low pollution and high yield. But up to now, there is only a few domestic manufacturers producing this product. So it is very important for the investigation in the synthesis of Ortho-phenylphenol.In this paper Ortho-phenylphenol was prepared from cyclohexanone dimmers by catalytic dehydrogenation, and the research was focused on the chose of dehydrogenation catalyst and its optimization. The catalyst performance was evaluated with the self-built fixed-bed reactor. This paper studied the catalyst performance of three kinds of modifiers, i.e., K₂SO₄ and KOH, MgO, Mg-Al complex. It’s proved that with the modification of K₂SO₄ and KOH the dehydrogenation catalysts had the highest activity, and with the modification of MgO, Mg-Al complex, the dehydrogenation catalysts had the best selectivity and stability. Generally speaking, with the modification of Mg-Al complex, the catalyst had the best performance.The impact of the amount of K₂SO₄ and KOH was studied, and it turned out with the increase of alkali, the activity of the catalyst declined. And through the change of residence time and pre-poisoned with CS₂, the stability of the catalyst was improved. 5 hr after the reaction, OPP selectivity can still maintain 81%. At the same time, by comparing the impact of excessive impregnation with same volume impregnation, it’s proved that the catalyst prepared by excessive impregnation had higher dehydrogenation activity. And a reaction net-work was achieved under this catalyst system.The impact of the amount of MgO was also studied. It turned out with w （Mg） = 3.75%, the dehydrogenation catalysts had the best selectivity and stability, and with w （Mg+Al） = 3.22%, w （Mg）: w （Al）= 3.2: 1, the same result was got.And in this paper it’s also proved that with the modification of Mg-compounds, less by-product biphenyl was formed.更多还原