Study On Reaction Characteristics Of Carbon Dioxide Hydrate In Nanoemulsion System

At present,with the intensification of global warming and greenhouse effect,carbon dioxide is gradually used or controlled by people in the form of hydrate,such as cold storage,air conditioning,carbon dioxide capture and storage,etc.Nanoparticles are widely used to promote hydrate formation due to their excellent heat and mass transfer characteristics.However,the microscopic mechanism of the effect of nanoparticles on hydrate formation and decomposition is still not clear.Therefore,this paper studies hydrate formation and decomposition based on hydrate formation system and 3ωmethod.Experimentally,We carry out carbon dioxide hydrate formation experiments in different concentrations and different particle size of nanoemulsion system by hydrate formation system,then we screen out the optimum particle size and emulsion concentration,illuminates the particle size and concentration of carbon dioxide hydrate formation rate and the influence of induction time and storage volume,compared with pure water system,found that nanoemulsion system to promote the effect is obvious.Combined with the existing hydrate models,the effect of nanoparticles on hydrate nucleation was further revealed from the perspective of heat and mass transfer.Then,the thermal physical properties of the hydrate were measured at room temperature by using an experimental device with 3ωmeasuring probe,and compared with the results of scholars at home and abroad.At the same time,the effects of different nanoemulsions on the decomposition rate and decomposition heat of carbon dioxide hydrate were studied,revealing a certain rule of hydrate decomposition.Finally,add SDBS and SDS surfactants into the selected optimal nanoemulsion system to study the effect of the interaction of nanoparticles and surfactants on the formation of carbon dioxide hydrate and reveal the synergistic mechanism of surfactants and nanoparticles.The experimental results show that SDS surfactant is little better than SDBS surfactant in promoting CO₂hydrate.In theory,we simulate the formation of carbon dioxide hydrate in the presence of SDS surfactants by molecular dynamics simulation method,From the microscopic perspective,the gas solubilization effect under the action of surfactant in the hydrate reaction process are shown more intuitively.Combined with the existing hydrate model,the mechanism of surfactant molecules is further explained,and the reliability of the experimental results is also proved.