Li, Yang published the artcileInfluence of polymer on oil displacement efficiency of petroleum sulfonates system, Safety of Dimidium bromide, the publication is Xinan Shiyou Daxue Xuebao, Ziran Kexueban (2009), 31(5), 135-138, database is CAplus.
The effect of polymer, such as partially hydrolyzed polyacrylamide, on the dynamic and equilibrium interfacial tension of petroleum sulfonates and oil/water systems is examined It is testified that polymer added in a certain concentration scope in the system only prolongs the time which the system needs to reach at the equilibrium interfacial tension, but the ability of the system for washing oil is not influenced. The simulation test by changing the injection sequence or injection mode of polymer and petroleum sulfonate indicates that the maximum oil displacement efficiency is acquired by the injection mode in which the petroleum sulfonate solution is injected after polymer flooding. The main reason is the decrease of adsorption site on the surface of rock for the adsorption of partially hydrolyzed polyacrylamide by hydrogen bond and the reduction of association body formed by polar group, so the loss of petroleum sulfonate in the core is decreased, as a result, the oil displacement efficiency of petroleum sulfonate for enhanced oil recovery is relatively increased.
Xinan Shiyou Daxue Xuebao, Ziran Kexueban published new progress about 518-67-2. 518-67-2 belongs to bromides-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Benzene, name is Dimidium bromide, and the molecular formula is C20H18BrN3, Safety of Dimidium bromide.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary