Difference between imidazoline oil solubility and water solubility:

Imidazoline polyoxyethylene ether is a kind of hydrophilic substance, mainly soluble in water and alcohol, is an oil-soluble non-ionic surfactant, water-soluble and has good anti-emulsification properties. The alkyl imidazoline structure of oil-soluble corrosion inhibitor is a kind of alkaline organic intermediate soluble in alcohol and hydrocarbons, which is dispersed in water and cannot be dissolved so that it can be strongly adsorbed on the metal surface. The hydrophobic surface forms a dense molecular film structure on the surface of the object and acts as a corrosion inhibitor. Water-soluble corrosion inhibitors play an anti-corrosion role by directly adhering to the metal surface, but because the tail dissolves in water, there is water molecular intrusion and corrosion in the place where the molecules are not closely arranged, and the oil-soluble corrosion inhibitor enters the oil in the non-polar tail, forming water molecules difficult to absorb the oil film. The mixture of water-soluble corrosion inhibitor only needs to be diluted with water or used in combination with other corrosion inhibitors. The procedure is relatively simple, the safety is high, and the injection process is direct and convenient. The oil-soluble corrosion inhibitor should be diluted with alcohols, aromatics and other oil solvents according to a certain ratio and steps before it can be used, but the film formation of the oil-soluble corrosion inhibitor is faster and the filling requirement is small. Taking the cooling tower as an example, the use of water-soluble corrosion inhibitors, the corrosion of the top of the tower can not be effectively controlled, some interfaces and long-term wear out there will be strong corrosion under the scale, the dehydration detection after corrosion can not play a role in preventing the corrosion of the top of the tower. After the use of oil-soluble corrosion inhibitor, it is necessary to adjust and increase and decrease the amount according to the situation of the refinery, such as the injection amount is small, the metering pump is easy to fail to increase the amount in winter, resulting in the injection interruption at the top of the refining tower, and improving the complexity of the process and management difficulty. Compared with water-soluble corrosion inhibitors, the corrosion inhibition efficiency of oil-soluble corrosion inhibitors is higher than that of water-soluble corrosion inhibitors, but water-soluble corrosion inhibitors have obvious advantages and are practical and convenient.