Method for preparing silicon-containing polyether demulsifier

Abstract

The invention discloses a method for preparing a silicon-containing demulsifier. The method comprises the steps of adopting a fractional step method to first perform alcoholysis on gamma-trimethoxysilyl propyl methacrylate, alcohol and deionized water for 2-4 h at the pH of 3-5, performing stirring reaction for 1-3 h at a temperature of 60-80 DEG C, and obtaining an oligosiloxane product A containin Si-OH; adding a polyether demulsifier, a basic catalyst and calcium oxide into a reactor with a stirring and dropwise adding device and a condensing pipe, controlling the temperature to be 60-130 DEG C, adding the product A dropwise, continuing to performing stirring reaction for 3-6 h after the dropwise adding and then adding a solvent dissolution crude product, performing stirring for 1-3 h and then standing, filtering out solid matter, and performing reduced pressure distillation to remove a solvent to obtain the silicon-containing demulsifier. The obtained demulsifier has the advantages of being good in dehydration effect, small in usage amount and low in demulsification temperature.

Description

technical field [0001] The invention relates to a preparation method of a polyether demulsifier, in particular to a preparation method of a silicon-containing polyether demulsifier suitable for demulsification and dehydration of crude oil emulsion. Background technique [0002] With the continuous exploitation of crude oil and the continuous development and application of oil recovery technology, the crude oil emulsion has become more stable. Most of the crude oil produced in the oil field is exploited in the form of oil-water emulsion, and the water content of crude oil increases year by year, which aggravates the The task of demulsification and dehydration of emulsified crude oil is realized. The demulsifier single agent currently used in China is basically non-ionic polyoxyethylene polyoxypropylene ether demulsifier. The broad-spectrum adaptability of the oil is poor. Although a variety of polyether demulsifiers can improve the demulsification effect after compounding, ...

AI Technical Summary

Problems solved by technology

Although the demulsification effect of this kind of demulsifier has been improved to a certain extent, its water solubility has decreased, and the dehydration effect and broad-spectrum adaptability still cannot meet the requirements of oil field production.