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Method for treating oil-containing waste water

A treatment method and technology for oil extraction wastewater, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of secondary pollution, high moisture content of scum, accelerated equipment corrosion, etc. The effect of post-processing

Inactive Publication Date: 2007-05-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN85107131 introduces a demulsifier based on inorganic aluminum salts and iron salts for treating oily sewage. When using this agent to treat sewage, a large amount of scum is produced, and the water content of the scum is high, which brings secondary problems. Pollution
However, the addition of strong acid not only accelerates the corrosion of equipment, but also adds other pollutants during the treatment process.

Method used

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  • Method for treating oil-containing waste water
  • Method for treating oil-containing waste water
  • Method for treating oil-containing waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In a four-necked flask with a stirring system, a thermometer, and a condenser with a volume of 1 L, add 146.26 grams of triethylenetetramine, install the four-necked flask in a constant temperature water bath, start stirring, and control the reaction temperature at 40 ° C. 176 grams of ethylene oxide was added. After reacting for 5 hours, add 80 grams of bifunctional dichloroethylene, control the reaction temperature at 150° C., continue the reaction for 8 hours, and finally add 134 grams of hydrochloric acid (chemically pure) to stop the reaction, and let it cool to room temperature to obtain the demulsifier A-1. The kinematic viscosity is 2890mm 2 / s, the cationic degree is 3.1mmol / g.

Embodiment 2

[0035] In a four-neck flask with a volume of 1 L, add 765 grams of fresh water, start stirring, and add 1.8 grams of nonionic polyacrylamide. After it was completely dissolved, 0.31 g of sodium hydroxide (chemically pure) was added to adjust the pH value of the solution to 11-12. Then add 2.8×10 -4 Gram EDTA disodium (chemically pure), add 3.5×10 -4 gram of ammonium persulfate (chemically pure), add 4.2×10 -4 Gram N, N-dihydroxyethyl azobisisobutylamidine hydrochloride (chemically pure), control the reaction temperature at 50 ° C, after mixing 2.1 gram of formaldehyde (chemically pure), 3.8 gram of dimethylamine (chemically pure) , into the four-necked flask, the reaction time is 6h. Finally, 4.3 g of hydrochloric acid (chemically pure) was added to stop the reaction to obtain flocculant B-1. The kinematic viscosity is 406.5mm 2 / s, the cationic degree is 16.7mmol / g.

Embodiment 3

[0037] In a four-necked flask with a volume of 1 L, add 116 grams of hexamethylenediamine, install the four-necked flask in a constant temperature water bath, control the reaction temperature at 40° C., start stirring, and add 116 grams of propylene oxide. After 2 hours of reaction, the reaction temperature was raised to 80°C, and the reaction was continued for 5 hours to obtain a substituted amine, and then 73.9 grams of difunctional epichlorohydrin was added to control the reaction temperature at 110°C, and the reaction was continued for 10 hours, and finally 120 grams of Hydrochloric acid (chemically pure) stopped the reaction, and allowed to cool to room temperature to obtain demulsifier A-2. The kinematic viscosity is 3460mm 2 / s, cationic degree is 3.6mmol / g.

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Abstract

A process for treating the oil contained sewage in oil field includes such steps as adding demulsifier (linear low-molecular cationic ammine polymer with multiple hydroxy groups), demulsifying, and adding flocculant (cationic polymer whose principal component is aminomethyl polyacrylamide).

Description

technical field [0001] The invention relates to a treatment method for oily waste water, in particular to a treatment method for oily waste water in oilfields and highly viscous oil recovery waste water. Background technique [0002] In the process of petroleum processing or mining, a large amount of oily sewage will be produced, and the process of gravity oil separation, dissolved air flotation, and biological oxidation is usually used to treat this sewage. In the process of oily sewage treatment, demulsifier must be added to demulsify the oily sewage, so as to achieve the purpose of oil removal. The most commonly used demulsifier is polyaluminum chloride (abbreviated as PAC). Although it has good demulsification and oil removal performance, the biggest disadvantage is that the amount of scum generated during the treatment process is large, and the water content of the slag is as high as 95%. ~99.5%, and the flocs are loose and easily broken, which brings difficulties to t...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 杨丽王有华赵景霞
Owner CHINA PETROLEUM & CHEM CORP
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