The interfacial activity,wetting behavior,and ability of stimulating water injection wells in low permeability reservoirs in Daqing are investigated for commercial gemini surfactant G-52,butylene-N,N′-bis(layroyl ammonium bromide).

The paper is about the deinking research on the old newsprint by combining anionic gemini surfactant,didodecyl oxyethyl disodium sulphate(Z), with nonionic surfactant( B1).

Seven anionic Gemini surfactants with different length of hydrophobic chains and spacers have been synthesized and their surface/interface activities were studied.

Through reacting long chain 1,2-epoxy alkanes with alcohols and the dialkyl dihydroxyl compounds formed with 1,3-propane sultone,totally 7 sulfonate gemini surfactants in 2 series are prepared: that of different alkyl carbon number(ACN), C10,C12,C14,and C16,and of equal connector carbon number(CCN),C2,and that of equal ACN,C14,and different CCN,C2,C3,C4,and C2OC2.

Gemini surfactants are novel surfactant with especial molecule structure, which are made up of at least two hydrophilic groups (hydronium or polar groups) and two hydrophobic groups.

A new twin-type surfactant has very good properties in foaming,stabilization and extra-low surface tension under high temperature,high salinity and a wide range of pH value,and is good at emulsifying viscosity reduction and oil cleaning.

Ethoxylated nonylphenol phosphate gemini surfanctants with different degree of polymerization were synthesized by using ethoxylated nonylphenol,glycol diglycidyl ether and Phosphorus oxychloride as raw materials and BF3-ethyl ether as catalyst.