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在羟基香草醛的生产工艺改革中,羟基香草醇的催化脱氢是直接影响产品质量及原料利用率的关键步骤之一。我们通过大量试验筛选出可用于工业放大的脱氢催化剂,确定了合适的工艺条件,并为设计工业催化反应器提供了基本依据。催化剂的筛选据报道铜系金属催化剂对羟基香草醇脱氢具有活性,催化剂的第二组分则是锌或铬。脱氢后羟基香草醛的产率可达70％以上,有的报道是在反应原料中添加溶剂和水,产率可高达95％以上,但一般缺乏较长周期运转的数据。我们自制或收集了部分铜系金属催化剂的样品,首先进行了初步筛选。筛选均在玻
In the process of hydroxy vanillin production, the catalytic dehydrogenation of hydroxy vanillin is one of the key steps that directly affect product quality and raw material utilization. We selected a large number of experiments can be used for industrial amplification dehydrogenation catalyst, to determine the appropriate process conditions, and to provide a basic basis for the design of industrial catalytic reactor. Catalyst Screening It has been reported that copper metal catalysts are active for the dehydration of hydroxy vanillyl alcohol and the second component of the catalyst is zinc or chromium. The yield of hydroxy vanillin after dehydrogenation can reach more than 70%. Some reports add solvent and water to the reaction raw materials, and the yield can reach as high as 95% or more, but the data of long cycle operation are generally lacking. We made or collected part of the copper-based metal catalyst samples, first conducted a preliminary screening. Screening is in the glass