Method for preparing petroleum sulfonate surfactant by falling film sulfonation

Abstract

The invention discloses a method for preparing petroleum sulfonate surfactant, which belongs to the petrochemical field and is mainly used for preparing the petroleum sulfonate surfactant. In the method, crude oil distillate with 350 to 500 DEG C in temperature is served as a raw material, solvent naphtha with 60 to120 DEG C in temperature, aryl chloride or chloralkane are served as diluent, and gas-phase sulfur trioxide are served as sulfonating agent; a falling film reactor is adopted; and reaction temperature and aging temperature are controlled, so that the target product is obtaind. When the method is used for producing petroleum sulfonate, the range of applicable raw materials is wide and the sulfonating raw materials can be heavy petroleum distillate; in the reaction process, the fluidity of the reaction materials is high, the operation is stable and the reactor and the pipeline thereof are not blocked; the reaction effect is good, the conversion rate of aromatic reaction is high, the monosulfonate selectivity is high and the product quality is good and stable; and the production efficiency of the petroleum sulfonate is high and the production cost is low.

Description

technical field [0001] The invention relates to a preparation method of a petroleum sulfonate surfactant, which belongs to the field of chemical petroleum and is mainly used for preparing the petroleum sulfonate surfactant. The method uses crude oil distillate at 350-500°C as raw material, solvent oil at 60-120°C, chlorinated aromatics or chlorinated alkanes as diluent, sulfur trioxide in the gas phase as sulfonating agent, and adopts falling film method Reactor, by controlling the reaction temperature and aging temperature, the target product can be obtained, Background technique [0002] Petroleum sulfonate surfactants can be used in oilfield tertiary oil recovery and preparation of petroleum sulfonate fine chemicals. The use of petroleum sulfonate in surfactant flooding and composite flooding can greatly increase oil recovery (increase by about 20%), and can also be used as a viscous reducer and emulsifier for heavy oil (heavy oil), and is also an important clean oil Ra...

AI Technical Summary

Problems solved by technology

With the development of petroleum sulfonate application technology, the preparation technology of petroleum sulfonate has developed rapidly. The existing preparation technology includes tank reactor technology, tank group reaction technology, jet sulfonation reaction technology, membrane reaction technology, etc. Using existing technology to produce petroleum sulfonate, the reaction conversion rate is low, the selectivity of monosulfonic acid is poor, the product quality is unstable, the application range is narrow, and the raw material adaptability is poor.

Membrane sulfonation reaction has great development prospects in the sulfonation technology for preparing petroleum sulfonate, which is superior to other sulfonation technologies for preparing petroleum sulfonate, but this technology is still immature, mainly in the sulfonation process It is easy to block the reactor, so that the production cannot operate normally, or only low molecular weight raw materials can be used, resulting in unqualified products, etc.

It is reported that the existing patent "petroleum sulfonate surfactant for oilfield, its preparation method and its application in tertiary oil recovery" (Yang Zhenyu; Yang Lin; Gao Shutang; etc.; application date 1999-05-27 application number 99107580, authorized Announcement date 2003~11~19 Bulletin No. 1128006,) also relates to membrane type sulfonation, this method is to select the vacuum distillate distillate oil with molecular weight of 320~380 as raw material, but its used raw material vacuum distillate fraction is narrow, reaction High temperature, easy over-sulfonation, easy blockage in the membrane sulfonation reactor, unstable production operation