Oil-in-water type emulsion demulsifying agent and preparation method thereof

Abstract

The present invention discloses an oil-in-water type emulsion demulsifying agent and a preparation method thereof. Firstly, bisamide is prepared, then chlorinated polyether is prepared, and finally cationic polyether is obtained, namely the oil-in-water emulsion demulsifying agent. The preparation method has readily available raw materials, is simple in operation, and has low equipment requirements. The prepared demulsifying agent is a cationic polymer with a network structure formed by the reaction of bisamide and epichlorohydrin, has a special network structure and a very strong surface activity, has a good demulsification function, is a reverse demulsifying agent suitable for chemical flooding produced liquid, can be used in oilfield produced wastewater treatment, can break the emulsion interfacial energy, and has an oil removal rate of more than 98% in a use amount of 20-30 mg / L. The prepared demulsifying agent is not layered, has no caking and no mechanical impurities, and has characteristics of being fast in oil and water separating speed and being low in oil content of water, and a good demulsifying effect for a three compound combination flooding O / W emulsion and high oil removal efficiency.

Description

technical field

[0001] The invention relates to the preparation technology of C10G liquid hydrocarbon mixture in IPC classification, belongs to the technical field of petroleum industrial chemicals, in particular to an oil-in-water emulsion breaker and a preparation method thereof. Background technique

[0002] Crude oil wastewater is a typical oilfield wastewater, in which the content of suspended solids is high, the composition is complex and changeable, and the stability is strong. Most of them are o / w (oil-in-water) emulsions.

[0003] With the popularization and implementation of tertiary oil recovery technology, the stability of produced fluid is getting stronger and stronger, which makes oil-water separation more difficult. Correspondingly, the separation difficulty of oil-in-water emulsion formed after oil-water separation also increases correspondingly. In order to remove most of the suspended oil and create favorable conditions for the filtration system, softening ...

Examples

Embodiment 1

[0021] Add 340g of acetic acid into a 500mL four-necked bottle equipped with a thermometer and agitator, blow in nitrogen gas, raise the temperature to 50°C, add 103g of diethylenetriamine dropwise, and the reaction is exothermic. ℃, reacted for 12h, and the by-product water was removed to obtain a yellow viscous liquid——bisamide.

[0022] Add 50g of organic solvent ethanol, 2g of tin tetrachloride and 25g of the bisamide synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser in sequence. Propane 235g, stirred for 5h, cooled to obtain a brown-red viscous liquid—chlorinated polyether.

[0023] Add 350g of the chlorinated polyether synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser tube, raise the temperature to 50°C, blow in nitrogen gas, add 80g of dimethylamine aqueous solution dropwise, after the dropwise addition is completed, at 80°C Keep the temperature constant for 3 hours, rai...

Embodiment 2

[0025] Add 340g of acetic acid into a 500mL four-necked bottle equipped with a thermometer and agitator, blow in nitrogen gas, raise the temperature to 50°C, add 189g of tetraethylenepentamine dropwise, the reaction is exothermic, and the dropping time is controlled for about 2h, and the temperature continues to rise to 180°C ℃, reacted for 12h, and the by-product water was removed to obtain a yellow viscous liquid——bisamide.

[0026] Add 50g of organic solvent ethanol, 2g of tin tetrachloride and 25g of the bisamide synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser in sequence. 318g of propane, stirred for 5h, and cooled to obtain brown-red viscous liquid—chlorinated polyether.

[0027] Add 350 g of the above-synthesized chlorinated polyether to a 500 mL four-necked bottle equipped with a thermometer, agitator and condenser tube, raise the temperature to 50 ° C, blow in nitrogen gas, add 96 g of dimethylamine aqueous solution ...

Embodiment 3

[0029] Add 146g of adipic acid and 50g of water into a 500mL four-necked bottle with a thermometer and agitator, blow in nitrogen, raise the temperature to 50°C, add 103g of diethylenetriamine dropwise, the reaction is exothermic, and the dropping time is controlled for about 2h , continue to heat up to 160 ° C, react for 12 hours, remove the by-product water to obtain a yellow viscous liquid - bisamide.

[0030] Add 50g of organic solvent ethanol, 2g of tin tetrachloride and 20g of the bisamide synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser in sequence. Propane 315g, stirred for 5h, cooled to obtain a brown-red viscous liquid—chlorinated polyether.

[0031]Add 300g of the chlorinated polyether synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser tube, raise the temperature to 50°C, blow in nitrogen gas, add 98g of dimethylamine aqueous solution dropwise, after the dropwise addi...

technical field

[0001] The invention relates to the preparation technology of C10G liquid hydrocarbon mixture in IPC classification, belongs to the technical field of petroleum industrial chemicals, in particular to an oil-in-water emulsion breaker and a preparation method thereof. Background technique

[0002] Crude oil wastewater is a typical oilfield wastewater, in which the content of suspended solids is high, the composition is complex and changeable, and the stability is strong. Most of them are o / w (oil-in-water) emulsions.

[0003] With the popularization and implementation of tertiary oil recovery technology, the stability of produced fluid is getting stronger and stronger, which makes oil-water separation more difficult. Correspondingly, the separation difficulty of oil-in-water emulsion formed after oil-water separation also increases correspondingly. In order to remove most of the suspended oil and create favorable conditions for the filtration system, softening ...

Examples

Embodiment 1

[0021] Add 340g of acetic acid into a 500mL four-necked bottle equipped with a thermometer and agitator, blow in nitrogen gas, raise the temperature to 50°C, add 103g of diethylenetriamine dropwise, and the reaction is exothermic. ℃, reacted for 12h, and the by-product water was removed to obtain a yellow viscous liquid——bisamide.

[0022] Add 50g of organic solvent ethanol, 2g of tin tetrachloride and 25g of the bisamide synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser in sequence. Propane 235g, stirred for 5h, cooled to obtain a brown-red viscous liquid—chlorinated polyether.

[0023] Add 350g of the chlorinated polyether synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser tube, raise the temperature to 50°C, blow in nitrogen gas, add 80g of dimethylamine aqueous solution dropwise, after the dropwise addition is completed, at 80°C Keep the temperature constant for 3 hours, rai...

Embodiment 2

[0025] Add 340g of acetic acid into a 500mL four-necked bottle equipped with a thermometer and agitator, blow in nitrogen gas, raise the temperature to 50°C, add 189g of tetraethylenepentamine dropwise, the reaction is exothermic, and the dropping time is controlled for about 2h, and the temperature continues to rise to 180°C ℃, reacted for 12h, and the by-product water was removed to obtain a yellow viscous liquid——bisamide.

[0026] Add 50g of organic solvent ethanol, 2g of tin tetrachloride and 25g of the bisamide synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser in sequence. 318g of propane, stirred for 5h, and cooled to obtain brown-red viscous liquid—chlorinated polyether.

[0027] Add 350 g of the above-synthesized chlorinated polyether to a 500 mL four-necked bottle equipped with a thermometer, agitator and condenser tube, raise the temperature to 50 ° C, blow in nitrogen gas, add 96 g of dimethylamine aqueous solution ...

Embodiment 3

[0029] Add 146g of adipic acid and 50g of water into a 500mL four-necked bottle with a thermometer and agitator, blow in nitrogen, raise the temperature to 50°C, add 103g of diethylenetriamine dropwise, the reaction is exothermic, and the dropping time is controlled for about 2h , continue to heat up to 160 ° C, react for 12 hours, remove the by-product water to obtain a yellow viscous liquid - bisamide.

[0030] Add 50g of organic solvent ethanol, 2g of tin tetrachloride and 20g of the bisamide synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser in sequence. Propane 315g, stirred for 5h, cooled to obtain a brown-red viscous liquid—chlorinated polyether.

[0031]Add 300g of the chlorinated polyether synthesized above to a 500mL four-necked bottle equipped with a thermometer, agitator and condenser tube, raise the temperature to 50°C, blow in nitrogen gas, add 98g of dimethylamine aqueous solution dropwise, after the dropwise addi...

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