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Joint demulsifying method of stable asphalt oil-in-water emulsion

A water-in-oil emulsion and asphalt technology, which is applied in the directions of hydrocarbon oil dehydration/demulsification, electric/magnetic dehydration/demulsification, chemical dehydration/demulsification, etc., can solve pipeline corrosion transportation costs, crude oil treatment troubles, Deal with problems such as ineffective effects, achieve good demulsification effect, less investment in equipment, and lower production costs

Inactive Publication Date: 2015-01-14
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of most crude oil droplets contains active substances, such as asphaltene, which can be adsorbed at the oil-water interface to form a stable water-in-oil emulsion, which leads to pipeline corrosion and increased transportation costs during crude oil production and transportation, and has a great impact on the subsequent treatment of crude oil. Trouble, some measures need to be taken to remove these emulsified water droplets
However, the current treatment effects of gravity sedimentation, heat treatment and chemical methods are not obvious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Step 1) After mixing a certain amount of toluene and asphalt, put it in a shaker to vibrate for 12 hours, then use a high-speed centrifuge to centrifuge at a speed of 7000rpm for 60 minutes to remove impurities contained in the asphalt, and prepare a toluene solution with a asphalt content of 33wt%. Under stirring conditions, the above solution was mixed with a concentration of 0.01mol.l -1 KCl aqueous solution was mixed to prepare asphalt-stabilized water-in-oil emulsion with a water content of 10 wt%.

[0014] Step 2) Dissolve ethyl cellulose in toluene to prepare a solution with a concentration of 150 ppm, take a certain amount of the above solution and add it to the emulsion obtained in step 1), so that the concentration of ethyl cellulose in the emulsion is 10 ppm, and stir for 30 s.

[0015] Step 3) Select stainless steel as the electrode material, the electrode system is two electrodes, and the electrode plates are placed in parallel, and a voltage of 3V is appli...

Embodiment 2

[0017] Step 1) After mixing a certain amount of toluene and asphalt, put it in a shaker to vibrate for 16 hours, then use a high-speed centrifuge to centrifuge at a speed of 8000rpm for 50 minutes to remove impurities contained in the asphalt, and prepare a toluene solution with a asphalt content of 40wt%. Under stirring conditions, the above solution was mixed with a concentration of 0.05mol.l -1 KCl aqueous solution was mixed to prepare asphalt-stabilized water-in-oil emulsion with a water content of 15 wt%.

[0018] Step 2) Dissolve ethyl cellulose in toluene to prepare a solution with a concentration of 150 ppm, take a certain amount of the above solution and add it to the emulsion obtained in step 1), so that the concentration of ethyl cellulose in the emulsion is 20 ppm, and stir for 40 s.

[0019] Step 3) Select stainless steel as the electrode material, the electrode system is two electrodes, and the electrode plates are placed in parallel, and a voltage of 5V is appli...

Embodiment 3

[0021] Step 1) After mixing a certain amount of toluene and asphalt, put it in a shaker to vibrate for 18 hours, then use a high-speed centrifuge to centrifuge at a speed of 10,000 rpm for 40 minutes to remove impurities contained in the asphalt, and prepare a toluene solution with a asphalt content of 48 wt%. Under stirring conditions, the above solution was mixed with a concentration of 0.1mol.l -1 KCl aqueous solution was mixed to prepare asphalt-stabilized water-in-oil emulsion with a water content of 20 wt%.

[0022] Step 2) Dissolve ethyl cellulose in toluene to prepare a solution with a concentration of 150 ppm, take a certain amount of the above solution and add it to the emulsion obtained in step 1), so that the concentration of ethyl cellulose in the emulsion is 30 ppm, and stir for 45 s.

[0023] Step 3) Select stainless steel as the electrode material, the electrode system is two electrodes, and the electrode plates are placed in parallel, and a voltage of 6V is ap...

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Abstract

The invention relates to a joint demulsifying method of a stable asphalt oil-in-water emulsion. The joint demulsifying method is characterized in that the stable asphalt oil-in-water emulsion is firstly prepared, a small amount of a natural polymer ethyl cellulose as a demulsifying agent is added into the emulsion so as to increase grain sizes of emulsion droplets and the probability of collision between the emulsion droplets and then a low-voltage electric field is applied, the mutual fusion between the droplets is promoted by virtue of the electric field and thus the synergetic demulsifying of the demulsifying agent and the electric field to the stable asphalt oil-in-water emulsion is achieved and the demulsifying efficiency is improved. According to the method, by adding the small amount of the natural polymer ethyl cellulose as the demulsifying agent and applying the low-voltage electric field, on the basis that the grain sizes of the emulsion droplets and the probability of collision between the emulsion droplets are increased, the separation of oil and water of the oil-in-water emulsion is realized by virtue of the synergetic effects of the demulsifying agent and the electric field so as to achieve good demulsifying effect. The demulsifying method is simple and free of pollution, the amount of the demulsifying agent is less, the cost is low, the demulsifying can be achieved at a low voltage and the industrialization is easily achieved.

Description

technical field [0001] The invention relates to a combined demulsification method for bitumen-stabilized water-in-oil emulsion, which belongs to the field of oil field chemistry. Background technique [0002] An emulsion is a dispersion system, usually obtained by dispersing one liquid into another immiscible liquid by shearing in the presence of surface active substances. According to the type of dispersed phase and dispersion medium, it can be divided into two categories: oil-in-water emulsion and water-in-oil emulsion. Emulsions are widely used in fields such as medicine, food and petroleum industry. The surface of most crude oil droplets contains active substances, such as asphaltene, which can be adsorbed at the oil-water interface to form a stable water-in-oil emulsion, which leads to pipeline corrosion and increased transportation costs during crude oil production and transportation, and has a great impact on the subsequent treatment of crude oil. Trouble, some meas...

Claims

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Application Information

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IPC IPC(8): C10G33/00
CPCC10G33/04C10G33/02C10G2300/10C10G2300/206
Inventor 李秋红
Owner SHANDONG UNIV OF TECH
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