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Preparation of long-chain alkyl acyl benzene sulfonic acid sodium salt and application thereof in enhancing oil recovery rate

A long-chain sodium alkylacylbenzenesulfonate and sodium alkylacylbenzenesulfonate technology, which is applied in the direction of sulfonate preparation, drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty in raw material supply, Achieve the effects of enhanced oil recovery, wide source of acid chloride and simple production process

Inactive Publication Date: 2011-01-05
JIANGNAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of molecular structure, the purpose of having two long-chain alkyl groups on the benzene ring is to increase the lipophilicity of the surfactant, but the synthesis of double-long-chain alkylbenzene requires olefins or halogenated hydrocarbons with appropriate chain lengths, and the supply of raw materials is relatively limited. difficulty

Method used

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  • Preparation of long-chain alkyl acyl benzene sulfonic acid sodium salt and application thereof in enhancing oil recovery rate
  • Preparation of long-chain alkyl acyl benzene sulfonic acid sodium salt and application thereof in enhancing oil recovery rate
  • Preparation of long-chain alkyl acyl benzene sulfonic acid sodium salt and application thereof in enhancing oil recovery rate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Preparation of dodecyllauroylbenzene intermediate

[0029] Industrial grade dodecylbenzene (Jinling Petrochemical Nanjing Alkylbenzene Plant) and lauroyl chloride (analytical grade, China Pharmaceutical Group Shanghai Chemical Reagent Company) were used in AlCl 3 (analytical pure, Shanghai Chemical Reagent Company, China Pharmaceutical Group) reacted in the presence of dodecylbenzene, the amount of dodecylbenzene was 0.1mol, the molar ratio of dodecylbenzene to lauroyl chloride was 1:2, lauroyl chloride and AlCl 3 The molar ratio is 1:1.2, lauroyl chloride is added dropwise under ice bath, the dropping temperature does not exceed 5°C, after the dropwise temperature is raised to 50°C, and the reaction is continued for 4h. After the reaction is completed, 60 mL of 5 mol / L concentrated hydrochloric acid is added to hydrolyze the complex under ice-bath conditions, and the acylation conversion rate of the alkylbenzene can reach more than 98%. Extract with aqueo...

Embodiment 2

[0034] Embodiment 2 Preparation of sodium dodecyllauroylbenzenesulfonate (DLBS)

[0035] DLB was sulfonated with chlorosulfonic acid. The amount of DLB ​​is 0.035mol, the molar ratio of DLB ​​to chlorosulfonic acid is 1:2.6, the reaction temperature is 30°C, and the reaction time is 4h. After the reaction is completed, the sulfonated product is neutralized with 30% NaOH aqueous solution to obtain a crude DLBS product with a sulfonation rate close to 70%. After petroleum ether extraction, desalting and column chromatography (strongly basic polystyrene anion exchange resin), the purified DLBS is obtained. Figure 4 IR spectrum of DLBS at 1685cm -1 There is a clear carbonyl absorption peak. Figure 5 It is the mass spectrum of DLBS. In the negative charge mode, the mass / charge ratio of the anion is generally M-Na, from Figure 5 It can be seen that a group of mass / charge ratio = 479.2, 493.3, 507.3, 521.3 molecular ion peaks, exactly the target product C 10 ~C 13 Alkyl lau...

Embodiment 3

[0036] The surface chemistry performance test of embodiment 3 DLBS:

[0037] Dissolve DLBS in pure water, measure the surface tension at 45°C, and compare with LAS, HABS2#, HABS1#, the surface tension changes with the concentration as follows Image 6 As shown, the relevant surface active parameters are shown in Table 3. It can be seen from Table 3 that the cmc of DLBS is 1.1×10 -5 mol / L, γ cmc It is 28.6mN / m, and its surface activity is better than that of HABS and LAS.

[0038] Table 3 The critical micelle concentration cmc of DLBS, the effectiveness of reducing surface tension γ cmc , the saturated adsorption capacity Γ max And the molecular cross-sectional area a at the gas / liquid interface during saturated adsorption ∞ and its comparison with the corresponding parameters of LAS and HABS

[0039] product

[0040] Figure 7 It is the interfacial tension between DLBS aqueous solution (5mM) and normal alkanes with different chain lengths. It can be seen that ...

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Abstract

The invention discloses the preparation of a long-chain alkyl acyl benzene sulfonic acid sodium salt and an application thereof in enhancing oil recovery rate and belongs to the technical fields of colloid and interface chemistry. Industrial-grade dodecylbenzene and fat acyl chloride are taken as raw materials, and the long-chain alkyl acyl benzene sulfonic acid sodium salt is prepared by carrying out acidylating reaction, sulfonation reaction and neutralization reaction on the raw materials. Experiments show that dodecyl lauroyl benzene sulfonic acid sodium salt DLBS (5mM) below 45DEG C can enable the interfacial tension of C7-C16 n-alkane and water to be reduced to the order of magnitude of 10-1mM / m, if being compounded with HABS1#, the interfacial tension of crude oil in No.4 Oil Production Plant of Daqing Oilfield Company Ltd. and imitation stratum water in the NaOH concentration range of 0.5 percent to 1.0 percent can be reduced to the order of magnitude of 10-3mM / m, and especially, and if being compounded with HABS1# and a little ampholytic surfactant, the interfacial tension of crude oil in No.4 Oil Production Plant of Daqing Oilfield Company Ltd. and imitation stratum water in the Na2CO3 concentration range of 1.2 percent to 2.0 percent can be reduced to the order of magnitude of 10-3mM / m. The product is expected to replace HABS2# and is applicable to strong base, especially weak base ASP combination flooding.

Description

technical field [0001] The preparation of a long-chain alkylacylbenzenesulfonic acid sodium salt and its application in enhancing oil recovery belong to the technical field of colloid and interface chemistry. Background technique [0002] Generally, only 30% to 40% of the crude oil can be recovered in the oil field after the primary recovery (self-injection) and the secondary recovery (water flooding), and 60% to 70% of the crude oil remains underground. Studies have shown that tertiary oil recovery technology must be applied to extract this part of residual oil. Chemical flooding is one of the most important tertiary oil recovery technologies. It reduces the interfacial tension of crude oil / formation water and increases the viscosity of the injection fluid by adding chemical agents such as alkali, surfactant, and polymer to the injection fluid, thereby achieving the purpose of further enhancing the recovery factor. Studies have shown that most oil reservoirs in my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C07C303/32C07C309/44
Inventor 崔正刚吴乐孙明明蒋建中王峰
Owner JIANGNAN UNIV
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