中东常压渣油热反应样品Zeta电位的研究

长期以来，有诸多研究者认识到了渣油的胶体性质，并且利用各种实验手段对其进行了研究。渣油的胶体稳定性对其热反应性能有重要影响作用。前人的研究认为，渣油胶体体系中的分散相主要是由沥青质构成，分散介质由芳香分和饱和分共同构成，吸附层由胶质构成。胶体的一个重要性质是电性质，渣油分子中含有大量的杂原子，使渣油极性分子的存在和渣油胶粒具有一定的电性。

Study on the Zeta potential of Middle East atmospheric residue and thermal reaction samples

The Zeta potential of thermal reaction samples of Middle East AR were studied by phase analysis light scattering (PALS) Zeta potential analyzer. The samples were confected into the mixture of n-heptane and toluene（1 g/1 g）, and the diluting ratio was (500 mL solvent) / (1 g sample). The results showed that the Zeta potential of ME-AR was –41.8 mV, and the Zeta potentials of 40 min and 100 min reaction samples were 26.9 mV and 31.8 mV. The result showed that the dielectric repulsive strength was not important to the colloidal stability of residue. Moreover, the diameters of colloidal granules of residue were increasing and the polydispersities were decreasing as the thermal reaction going on.