Petroleum sulfonate and preparation method thereof

Abstract

The invention discloses petroleum sulfonate and a preparation method thereof. The petroleum sulfonate comprises a petroleum component, a catalyst, an alkali solution, hydrogen and sulfur trioxide. Thepreparation method of the petroleum sulfonate includes preparing a sulfonated raw material; performing primary sulfonation and extraction to obtain unsulfonated oil and an extracting agent containingpetroleum sulfonic acid; repeating sulfonation and extraction on the unsulfonated oil until no unsulfonated oil is obtained; combining and distilling the extracting agent containing the petroleum sulfonic acid to obtain the petroleum sulfonic acid; performing ageing and neutralizing to obtain a petroleum sulfonate solution, and concentrating and drying the petroleum sulfonate solution to obtain apetroleum sulfonate product. The petroleum sulfonate product has high good interfacial tension performance, a sulfonation reactor has less coking during preparation and long operating cycle, and thecost is reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum sulfonate production, in particular to a petroleum sulfonate and a preparation method thereof. Background technique [0002] The reason why oilfield water flooding development has a low recovery rate is that the crude oil exists in the low-permeability zone of the oil layer in the form of oil droplets and discontinuous oil film in the later stage of development. Due to the interfacial tension of 30-50mN / m between oil and water, that is, the action of capillary force, the crude oil cannot It flows out of the ground with water. Recovery factor = swept volume × oil washing efficiency. According to this theory, the mechanism of tertiary oil recovery chemical flooding is to increase the viscosity of the injection fluid to increase the swept volume (polymer flooding), and increase the oil washing efficiency by adding surfactants. Petroleum sulfonate achieves the purpose of improving oil washing effic...

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Problems solved by technology

The synthesis of petroleum sulfonate has a large number of reports at home and abroad, and the publication number is CN 1486976A discloses the preparation method and application of alkylaryl sulfonate, selects heavy alkyl benzene and linear alkyl benzene according to a certain proportion The mixed alkylbenzene of composition is as raw material preparation alkylbenzene sulfonate; Publication number is that CN 101054514A discloses the carboxylate or sulfonate surfactant of alkylaniline, selects alkylaniline to prepare the carboxylic acid of alkylaniline Salt or sulfonate surfactant; Publication No. CN 1379076A discloses the special-purpose petroleum sulfonate preparation method for petroleum tertiary exploitation, is to be raw material with petroleum refinery 150-500SN base oil, utilizes SO 3 Gas sulfonation, extraction, neutralization, distillation and concentration are used to obtain petroleum sulfonate products for tertiary oil recovery; the publication number is CN 1327979A, which discloses the preparation method of petroleum sulfonate used in oilfields. Distillate oil, using three-stage tank group reactor sulfonation, extraction, and neutralization process can produce petroleum sulfonate with a content of more than 85%; the authorization number is that CN 101402592B discloses a kind of petroleum sulfonic acid and its salt and their Preparation method and application, using distillate oil at 280-600°C as raw material to prepare petroleum sulfonate products; the publication number is CN 1203935A which discloses petroleum sulfonate for tertiary oil recovery, its preparation method and its application, using crude oil or 200-500°C fraction Oil, furfural extracted oil, raffinate oil, and hydrodecondensed tail oil are used as raw materials to prepare petroleum sulfonate; the raw materials used in the above-mentioned petroleum sulfonate products are either crude oil or crude oil fractions or solvent refined and hydrotreated The fraction of the raw material, the preparation process of the raw material is not disclosed, because the raw material for sulfonation is not optimized, the yield of sulfonate produced by sulfonation is not high, and the product quality is not high; there is inevitably too much acid residue in the sulfonation process , block the pipeline and affect the normal operation of the device; when the shutdown occurs, it is easy to cause leakage of sulfur trioxide waste gas, waste water and waste acid slag

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