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Prepn of faintly alkaline alkylbenzene sulfonate

A technology of alkylbenzene sulfonate and heavy alkylbenzene, which is applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., and can solve problems such as equipment and pipeline corrosion

Inactive Publication Date: 2004-01-21
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently used surfactants are generally alkylbenzene sulfonates, but this alkylbenzene sulfonate contains strong bases such as sodium hydroxide or potassium hydroxide. When used, it is extremely alkaline due to its strong alkalinity. It is easy to cause corrosion to various equipment and pipelines

Method used

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  • Prepn of faintly alkaline alkylbenzene sulfonate
  • Prepn of faintly alkaline alkylbenzene sulfonate
  • Prepn of faintly alkaline alkylbenzene sulfonate

Examples

Experimental program
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Embodiment

[0020] Get 300 grams of cut heavy alkylbenzene raw material, heat to 37 ℃ in the reactor of 1000ml, under the condition of stirring, dropwise add 20% (weight percent) SO 3 oleum or liquid SO3 dissolved in a solvent, reacted for 4 hours; then neutralized to a pH value of 7 with 20% (percentage by weight) of NaOH, then divided acid or desolvated to obtain heavy alkylbenzene sulfonate monomer, then add 10% (weight percent) dodecabranched alkylbenzene, 0-5% (weight percent) nonionic surfactant and 20% (weight percent) polar solvent in the monomer to obtain A weakly alkalized alkylbenzene sulfonate surfactant for tertiary oil recovery with an active substance content of 50% (weight percentage).

[0021] Below is the conclusion obtained by experiment of weakly alkalized alkylbenzene sulfonate of the present invention:

[0022] 1. Performance evaluation of interfacial tension

[0023] refer to figure 1 , the experimental conclusion shows that within a wide concentration range of a...

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Abstract

The preparation of faintly alkaline alkylbenzene sulfonate adopts heavy alkylbenzene through rectification and cutting treatment as main material, which is reacted with fuming sulfuric acid and SO3 gas or liquid. Through subsequent addition of technological water to hydrolyze, aging, addition of sodium hydroxide solution for neutralization and other steps, sodium alkylbenzene sulfonate is produced. Adding lower carbon alcohol, aromatic solvent or other solvent, and non-ionic surfactant can produce faintly alkaline alkylbenzene sulfonate surfactant.

Description

technical field [0001] The invention relates to a surfactant used in oil field (oil displacement), in particular to a preparation method of weakly alkalized alkylbenzene sulfonate. Background technique [0002] So far, the application of surfactants in oil recovery research has achieved great development both in theory and practice. At present, the following injection systems have basically been formed. (1) active water flooding; (2) micellar solution flooding; (3) low interfacial tension system oil recovery; (4) ASP flooding. Among them, ASP flooding (alkali+polymer+surfactant) can still obtain high oil displacement efficiency in the case of substantially low surfactant dosage, so it has become a successful economical and technical improvement. New technologies for recovery. [0003] After the oil field enters the high water cut period, the remaining oil is trapped in the reservoir rock pores as discontinuous oil blocks, and the two main forces acting on the oil beads ar...

Claims

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Application Information

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IPC IPC(8): C07C309/30C09K23/02
Inventor 伍晓林廖广志杨振宇陈广宇张国印徐艳姝赵颖华刘庆梅王海蜂杨勇
Owner PETROCHINA CO LTD
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