A kind of method of preparing oil displacement agent by alkali lignin modification

A technology of alkali lignin and oil displacing agent, which is applied in the field of preparing oil displacing agent by modification of alkali lignin, can solve the problems of high cost of oil displacing agent, pollute the environment, waste resources and the like, achieve stable performance and solve environmental pollution. Effect

Inactive Publication Date: 2016-01-13
MALASIAN PALM OIL BOARD +1
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AI Technical Summary

Problems solved by technology

In the tertiary oil recovery process, the oil displacement agent prepared by petroleum sulfonate, heavy alkylbenzene sulfonate, polyacrylamide (PAM) and its modified polymer is mainly used at present. An oil displacement agent for tertiary oil recovery with sulfonate as the main component. However, due to the high cost of oil displacement agent and the adsorption loss during use, the economic benefits of tertiary oil recovery are greatly reduced
[0003] So far, lignin, as a by-product of papermaking waste liquid, has been discharged into rivers, lakes and seas except for a small part of which has been used at a low value, which not only wastes resources but also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: 10g alkali lignin and 1gH 2 o 2 Oxidation at 70°C for 30 minutes, then adding 2g of anhydrous sodium sulfite for sulfonation at 180°C for 30 minutes, amination of the obtained sulfonate with 0.6g of ethylenediamine and 1g of formaldehyde at 80°C for 6 hours, the aminated product was mixed with 2g of decabromide Hexane was alkylated at 80°C for 6 hours. Taking Gudao crude oil from Shengli Oilfield as the measurement object, when mixed with 0.2wt% NaOH, the measured minimum oil-water interfacial tension can reach 10 -3 mN / m.

Embodiment 2

[0017] Embodiment 2: 10g alkali lignin and 1.5gH 2 o 2 Oxidation at 70°C for 30 minutes, then adding 2g of anhydrous sodium sulfite for sulfonation at 170°C for 30 minutes, amination of the obtained sulfonate with 1.2g of ethylenediamine and 1.5g of formaldehyde at 80°C for 6 hours, and the product after amination with 3.6g of bromine Hexadecane was alkylated at 80°C for 6 hours. Taking Gudao crude oil from Shengli Oilfield as the measurement object, when it is mixed with 0.4wt% NaOH, the measured equilibrium oil-water interfacial tension (1h) can reach 10 -3 mN / m.

Embodiment 3

[0018] Example 3: 10g of alkali lignin was sulfonated with 2g of anhydrous sodium sulfite at 170°C for 30 minutes, and the obtained sulfonate was aminated with 1.2g of ethylenediamine and 1.5g of formaldehyde at 80°C for 6 hours, and the aminated product was mixed with 3.6g Bromohexadecane was alkylated at 80°C for 6 hours. Taking Gudao crude oil from Shengli Oilfield as the measurement object, when it is mixed with 0.4wt% NaOH, the measured minimum oil-water interfacial tension can reach 10 -3 mN / m.

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Abstract

The invention discloses a method for preparing an oil-displacing agent by modification of alkali lignin, belonging to the technical field of oil exploitation. The oil-displacing agent is synthesized from a by-product alkali lignin in a papermaking industry as a material in manners of reacting with an oxidant and then reacting such as sulfonation, amination and alkylating, so as to prepare a surfactant from the alkali lignin. The oil-water interfacial tension can be obviously reduced after compounding with alkali. By adopting the method, the by-product alkali lignin of papermaking black liquid is reasonably utilized; environmental protection is facilitated; and a cheap oil-displacing agent can be synthesized. Thus, the tertiary recovery cost is reduced; and the method has good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for preparing an oil displacement agent by modifying alkali lignin. technical background [0002] In the case of increasingly tense fossil energy sources, enhanced oil recovery has become an important direction of oil exploration research. Chemical flooding is one of the main directions of tertiary oil recovery technology, and the key to chemical flooding process is the surfactant used. In the tertiary oil recovery process, the oil displacement agent prepared by petroleum sulfonate, heavy alkylbenzene sulfonate, polyacrylamide (PAM) and its modified polymer is mainly used at present. Sulfonated compound is an oil displacement agent for tertiary oil recovery. However, the economic benefits of tertiary oil recovery are greatly reduced due to the high cost of oil displacement agent and the adsorption loss during use. [0003] So far, lignin, as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C08H7/00
Inventor 罗淑娟朱云美周玉杰张建安申士成刘宏娟程可可刘德华戴玲妹赵雪冰米杰
Owner MALASIAN PALM OIL BOARD
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