High-efficiency low-temperature diesel oil demulsifier and industrial using method thereof

Abstract

The invention discloses a high-efficiency low-temperature diesel oil demulsifier and an industrial using method of the demulsifier. With glycol or water serving as a solvent, the low-temperature compound diesel oil demulsifier can be obtained through the following steps: adding 0.2%-5% by mass of aliphatic alcohol epoxyethane, 0.2%-5% by mass of epoxypropane copolymer and 0.3%-10% by mass of heptadecyl imidazole; then adding 0.1%-5% by mass of alcohols as cosolvents; and stirring for evenly mixing. The using method comprises the following steps: directly pumping the demulsifier into a whole production system in a certain proportion; evenly mixing the demulsifier with emulsified diesel oil, wherein the concentration is controlled to be 100-400ppm and the reaction temperature is controlled to be 0 to minus 20 DEG C; and standing for 1-8 hours, thereby clearly separating an oil layer from a water layer. With a by-product produced by a petrochemical enterprise as a main raw material, the demulsifier is used for demulsifying diesel oil alkali residues and has a remarkable effect. In demulsification, the use amount of the demulsifier is small, the environment pollution is slight, the production cost is low and the application range is wide.

Description

technical field [0001] The invention relates to a low-temperature diesel oil demulsifier and its industrial application method. Background technique [0002] Diesel oil obtained by fractional distillation in crude oil processing often contains corrosive substances such as naphthenic acid. The refinery generally uses the method of alkali washing to remove naphthenic acid, but the sodium naphthenate produced is a surfactant, which is easy to emulsify diesel oil. The alkali slag after alkali washing and emulsification is very stable and not easy to demulsify, and the oil content in the alkali slag also increases significantly, resulting in a large amount of waste of high-quality diesel oil every year and increasing the load of sewage treatment equipment. [0003] The problem of diesel emulsification generally exists in the production process of major refineries. With the continuous improvement of crude oil extraction technology and the application of various enhanced oil recov...

AI Technical Summary

Problems solved by technology

However, this method has obvious disadvantages. The former may add other substances to the oil, and the latter consumes a lot of manpower and material resources. Therefore, it is imperative to study a new method of demulsification.

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