Study On The Synthesis And Properties Of Lauric Acid Pipeline Insulation Material

In regions with high latitudes or during the spring and winter seasons,when the climate is cold and the temperature is low,the crude oil in the oil pipeline is often prone to solidification,which even leads to blockage.In order to ensure the smooth operation of the crude oil production,the anticoagulant and thermal insulation work of the crude oil pipeline is particularly important.The phase change energy storage material is converted through its own phase and absorbs or releases heat to achieve the active temperature control effect.The application of phase change materials in the field of crude oil transportation and the development of new phase-change thermal insulation materials for energy efficient oil pipelines have significant economic and environmental benefits,and therefore have a high research value.Based on the theory of phase change heat storage and temperature adjustment and combined with the working requirements of oil pipeline insulation,this paper selects selects organic lauric acid solid-liquid phase change material(LA)as phase change heat storage material.Two kinds of mesoporous materials,activated carbon(AC)and Mesoporous silicon nanoscale microspheres(MSNM),were used as the shaped carriers.Two kinds of new typed phase change thermal insulation materials for oil pipelines were prepared by porous adsorption method.By using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA)were used to analyze the structure,phase change behavior and performance of LA/AC and LA/MSNM these two kinds of composite phase change thermal insulation materials.The SEM results showed that lauric acid was successfully coated by both AC and MSNM carrier materials,and had good compactness.The FT-IR results showed that the complexation between lauric acid and the two mesoporous supports was only a physical chimerization,without any chemical reaction.The XRD,DSC and TGA analyses showed that the crystallinity and phase change enthalpy of the LA/AC composite phase change material were small,the melting enthalpy and solidificationenthalpy were 13.4 J/g and 10.0 J/g,respectively,while the LA/MSNM composite phase change material had good crystallization properties and thermal stability,and the phase change enthalpy was large,and the melting enthalpy and solidification enthalpy were 57.2 J/g and 58.8 J/g,respectively.After 50 cycles,the sample can still keep the shape,and the phase transition temperature and the enthalpy of phase change are basically unchanged,which shows that the LA composites all have good thermal cycling stability and thermal reliability.Overall,the heat storage performance of LA/MSNM composites is better than that of LA/AC composites.It is a more promising material for insulation of oil pipelines.