Compression Molding And Control Of Copper-based Catalyst For Preparing 1,6-hexanediol By Hydrogenation Of Dimethyl Adipate

1,6-Hexanediol is an important chemical raw material and intermediate.In the early stage of this group,we successfully developed a copper-based catalyst for the catalytic hydrogenation of dimethyl adipate and successfully carried out the catalyst powder.Scale up the preparation.On this basis,this study investigates the catalyst design and control,and uses micro and pilot fixed-bed reactors to investigate the catalyst activity and stability.Provide data support for its further industrialization.On the basis of the enlarged preparation of powder catalysts,the design and control of catalyst molding was studied using a micro-fixed bed reactor.First,the influence of the fluidity of the catalyst powder on the catalyst molding was investigated.When the amount of graphite added was 3%(mass content),the molded catalyst particles could be demolded smoothly and keep the particles intact.The effect of tableting strength on the lateral compression strength of the catalyst particles was investigated,and the activity of the catalysts under different tabletting strengths was evaluated.It was found that when the tablet strength is 24-36 KN/cm2,the activity of the catalyst is better.At this time,the lateral compression strength of the catalyst particles is 100-150 N/cm,and the catalyst wear rate is 1.8%.Meet the requirements of industrial production.Then,the effect of the catalyst particle size and pore structure on the catalytic activity was investigated.The results showed that as the catalyst size decreased,the initial activity of the catalyst gradually increased.When the cylindrical size was ?4×2 mm and ?3×2 mm,the initial catalyst activity The conversion rate can reach 99%.Adding a pore-expanding agent and adopting the preparation process of first forming and then roasting,the diameter of the catalyst pores increases,and the catalyst performance is significantly improved.Based on the experimental results of the micro-fixed bed,the activity of the catalyst was evaluated in the pilot plant.The results show that the increase in the diameter of the reaction tube can effectively eliminate the effect of the wall effect,and the catalyst stability has been improved.Under ? 4×2 mm and? 3×2 mm cylindrical catalysts,the feeding method was investigated,that is,the molar ratio of dimethyl adipate to solvent was 9: 1.The results showed that the catalyst performance was good and quite stable.Solved the decrease of catalyst activity caused by internal diffusion.