Preparation method and application of block polyether-beta-CD comb type demulsifying agent

Abstract

The invention relates to a preparation method and an application of a block polyether-beta-CD comb type demulsifying agent for demulsifying and dewatering crude oil. The invention can improve the demulsifying and dewatering efficiency of a crude oil demulsifying agent and the molecular weight and the compounding capacity of the demulsifying agent. The preparation method comprises the following steps of: dissolving beta-cyclodextrin in dimethysulfoxide (DMSO), using NaOH as a catalyst and slowly dropping allylbromide to react for 48 hours at a temperature of 0-10 DEG C to obtain allyl-beta-cyclodextrin; dissolving the allyl-beta-cyclodextrin and acrylic acid raw materials in water, and under the protection of nitrogen, carrying out a polymerization reaction for 8 hours by using NaHSO3 and (NH4)2S2O7 as an initiating system so as to obtain a cyclodextrin / acrylic acid main chain polymer; and finally, putting the main chain polymer and polyoxy-ethylene block polyether in a reactor to react for 12-16 hours to obtain a product, and extracting and centrifugally separating the product to obtain the block polyether-beta-CD comb type demulsifying agent. The preparation method has simple operation, moderate condition, simple equipment and easy industrial production. After the block polyether-beta-CD comb type demulsifying agent is mixed with crude oil, the water yield of the crude oil is high, and the demulsifying time is short, thus the block polyether-beta-CD comb type demulsifying agent can be widely applied to oil fields and refineries for demulsifying and dewatering.

Description

technical field The invention relates to a preparation method and application of a block polyether-β-CD comb-type demulsifier used for demulsification and dehydration in fields such as oil fields and refineries, and is especially suitable for oil fields to recover O / W and W / O crude oil of demulsification. Background technique Demulsification and dehydration of crude oil emulsion is an important link in petroleum production and processing. As most of my country's oilfields are in the middle and late stage of production, the increase of injected water makes the water content of the produced oil high, and the emulsion system is more complex and stable, and the strength of the interfacial film increases, which reduces the demulsification effect. At present, the most commonly used crude oil demulsification method in the petroleum industry is to add demulsifiers to crude oil. The demulsifier currently used in China is still the traditional ethylene oxide propylene oxide block c...

AI Technical Summary

Problems solved by technology

However, the choice of compounding agent is limited by the influence of the emulsion system, and at the same time affected by the system, the compounding effect cannot reach the best state