Technology method of synthesizing heavy oil sulfonate surfactant with sulfonation promoter

Abstract

The invention relates to a technology method of synthesizing a heavy oil sulfonate surfactant with a sulfonation promoter and mainly solves the problem of difficult stirring, serious coking and low sulfonic acid conversion rate in a heavy oil sulfonation process in synthesis of the heavy oil sulfonate surfactant. The technology method comprises the following steps: 1) dehydrating heavy oil to obtain dehydrated heavy oil; 2) mixing the sulfonation promoter with the dehydrated heavy oil according to proportion, feeding a mixed gas composed of SO3 and nitrogen when the temperature reaches an initial temperature being 65-85 DEG C, and carrying out a reaction for 20-60 min, wherein the initial reaction temperature increases and then the temperature is reduced in a middle stage and finally is reduced to 90-110 DEG C through natural constant-temperature treatment; and 3) aging the reaction product, adding alkaline liquid to neutralize the reaction product, and adding prepared mixed alcohol after neutralization with uniform stirring to obtain the heavy oil sulfonate surfactant which is 50% in concentration and is used for oil displacement. The technology method, in which the sulfonation promoter is used for synthesizing the heavy oil sulfonate surfactant, is high in the sulfonic acid conversion rate, low in reaction coking and is good in interface performance of a synthesized product.

Description

technical field [0001] The invention relates to a process for synthesizing a heavy oil sulfonate surfactant by using a sulfonation accelerator, and belongs to the technical field of surfactants used in oil field chemicals. Background technique [0002] At present, the surfactants used in oil field flooding mainly include heavy alkylbenzene sulfonates and petroleum sulfonates. While the demand for surfactants is increasing, the price of raw material heavy alkylbenzenes is increasing year by year, and the production cost is also increasing. rise. The content of aromatics in heavy oil is more than 30%, which is suitable for the production of surfactants for heavy oil sulfonate flooding. At present, there are no relevant reports on the specific application of heavy oil sulfonates to surfactants for oil displacement at home and abroad. [0003] The method of synthesizing heavy oil sulfonate mainly adopts oleum as sulfonating agent catalytic sulfonation method and sulfur trioxid...

AI Technical Summary

Problems solved by technology

[0004] The present invention is to overcome the serious coking in the heavy oil sulfonation process, the low conversion rate of sulfonic acid and the synthesis of heavy oil sulfonate surfactant in the background technology In order to solve the problem of poor interface performance of the product, a process method for synthesizing heavy oil sulfonate surfactant using a sulfonation accelerator is provided