MIL-100(Fe)复合吸附材料放大制备及其乙醇吸附工艺OA

To solve the problem of excessive ethanol emissions from the fermentation off-gas in fuel ethanol production,a spherical composite adsorbent MIL-100(Fe)@PAA-TEPA was scaled up from the milligram to kilogram level by optimizing the preparation process under normal temperature and pressure,which was applied to the adsorption separation of ethanol from the fermentation off-gas.The results show that within the confined spaces of amine-functionalized polyacrylate porous microspheres(PAA-TEPA),the precursor of MIL-100(Fe)undergoes heterogeneous nucleation and in situ crystallization growth,and MIL-100(Fe)crystals are uniformly anchored inside PAA-TEPA microspheres,with a particle size reduced to about 55%of that of MIL-100(Fe)powder crystals;This structural refinement increases the number of active adsorption sites and shortens the diffusion distance,thereby enhancing both the thermodynamic and kinetic performance of ethanol adsorption.The double-tower adsorption separation process is achieved after 20 cycles of normal temperature adsorption and hot air desorption,ethanol adsorption capacity retention rate of composite adsorbent is 95%in simulated fuel ethanol fermentation off-gas,demonstrating its good cycle stability and suitable for large-scale production and application,which provides technical support for the standard-compliant emission of ethanol in fermentation off-gas.