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A kind of organic/inorganic hybrid cationic anti-phase demulsifier and its preparation method and application

An inverse demulsifier and cation technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problems of reducing oil-water interfacial film tension, oil sludge coagulation, high cation degree, etc.

Active Publication Date: 2021-11-30
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to relevant literature research, traditional inverse demulsifiers are mainly cation-based. The reason is that the surface of the oil droplet has a negative charge. Through the neutralization of the charge, the agent can be combined with the oil droplet, thereby effectively reducing the oil-water interfacial film tension. , and finally achieve demulsification of clear water, but the problem is that the cation is too high, and it is easy to form sludge coagulation

Method used

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  • A kind of organic/inorganic hybrid cationic anti-phase demulsifier and its preparation method and application
  • A kind of organic/inorganic hybrid cationic anti-phase demulsifier and its preparation method and application
  • A kind of organic/inorganic hybrid cationic anti-phase demulsifier and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1, preparation of organic / inorganic hybrid cationic inverse demulsifier PNAD-1

[0053] (1) Weigh 2g nano-SiO 2 In a 100ml Erlenmeyer flask, use 80ml of 0.05mol / L NaOH solution to stir for 24h under sealed conditions to make it fully dispersed in the alkali solution, centrifuge to obtain a C ml solution (≈80mL), measure from the separated CmL solution Take 10mL, and then use 0.05mol / L HCl to titrate 10ml of C solution to neutrality, record the consumption of HCl solution as A ml, and finally use HCl solution to titrate the remaining solution (C-10)mL, the consumption of HCl solution Record B ml, and finally according to the formula: Finally, the surface content of silanol was calculated to be 5.35mmol / g;

[0054] (2) 5g nano-SiO 2 Uniformly dispersed in the mixed solvent of ethanol and water 70ml (V (水 / 乙醇) = 3), and use 2mol / L HCl solution to adjust the pH to 4 for 30 minutes, and place it on a magnetic stirrer every 5 minutes to stir for 1 minute to fin...

Embodiment 2

[0064] Embodiment 2, preparation of organic / inorganic hybrid cationic inverse demulsifier PNAD-2

[0065] (1) Weigh 2g nano-SiO 2 In a 100ml Erlenmeyer flask, use 80ml of 0.05mol / L NaOH solution to stir for 24 hours under sealed conditions to make it fully dispersed in the alkali solution, centrifuge to obtain a C ml solution, and then use 0.05mol / L HCl to 10ml of C The solution is titrated to neutrality, and the consumption is recorded as A ml. Finally, the (C-10) ml solution is titrated with HCl solution, and the consumption is recorded as B ml. Finally, according to the formula: Finally, the calculated silanol surface content is 5.25mmol / g;

[0066] (2) 5g nano-SiO 2 Uniformly dispersed in the mixed solvent of ethanol and water 70ml (V (水 / 乙醇) = 3), and use 2mol / L HCl solution to adjust the pH to 4 for 30 minutes, and place it on a magnetic stirrer every 5 minutes to stir for 1 minute to finally obtain uniformly dispersed nano-SiO 2 70ml solution containing 5g nano-SiO ...

Embodiment 3

[0076] Embodiment 3, preparation of organic / inorganic hybrid cationic inverse demulsifier PNAD-3

[0077] (1) Weigh 2g nano-SiO 2 In a 100ml Erlenmeyer flask, use 80ml of 0.05mol / L NaOH solution to stir for 24 hours under sealed conditions to make it fully dispersed in the alkali solution, centrifuge to obtain a C ml solution, and then use 0.05mol / L HCl to 10ml of C The solution is titrated to neutrality, and the consumption is recorded as A ml. Finally, the (C-10) ml solution is titrated with HCl solution, and the consumption is recorded as B ml. Finally, according to the formula: Finally, the surface content of silanol was calculated to be 5.35mmol / g;

[0078] (2) 5g nano-SiO 2 Uniformly dispersed in the mixed solvent of ethanol and water 70ml (V (水 / 乙醇) = 3), and use 2mol / L HCl solution to adjust the pH to 4 for 30 minutes, and place it on a magnetic stirrer every 5 minutes to stir for 1 minute to finally obtain uniformly dispersed nano-SiO 2 70ml solution containing 5g...

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Abstract

The invention discloses an organic / inorganic hybrid cationic anti-phase demulsifier as well as a preparation method and application thereof. The preparation method of described organic / inorganic hybrid cationic inverse demulsifier comprises the steps: 1) adopting silane coupling agent to nano-SiO 2 Surface hydroxyl modification to obtain modified nano-SiO 2 , modified nano-SiO 2 The surface terminal is connected with carbon-carbon double bond; 2) Modified nano-SiO 2 , Acrylamide and dimethyl diallyl ammonium chloride for ternary copolymerization reaction. The present invention uses unsaturated double bond silane coupling agent to nano SiO 2 Modified, modified nano-SiO 2 It has a certain degree of hydrophobicity and an unsaturated carbon-carbon double bond at the end. It can form a network structure with a hydrophobic hard core and a hydrophilic soft shell through ternary copolymerization with AM and DMDAAC. This structure can effectively increase the charge density. On the basis of ensuring low cationicity, effective demulsification is realized, and because the demulsifier to be compatible with this inverse demulsifier is non-ionic, the floc strength is low and the deoiling rate is high.

Description

technical field [0001] The invention relates to an organic / inorganic hybrid cationic anti-phase demulsifier and a preparation method and application thereof, belonging to the field of petrochemical industry. Background technique [0002] With the wide application of polymer flooding in tertiary oil recovery technology, the degree of emulsification of crude oil in water is getting higher and higher, and the difficulty of demulsification is becoming more and more difficult. On the basis of ensuring a low amount of demulsifier, the oil content in the demulsification water is getting higher and higher. High, which requires the provision of an agent that can be compounded with a demulsifier and effectively reduce the oil content in the demulsified water, that is, an inverse demulsifier. According to relevant literature research, traditional inverse demulsifiers are mainly cationic, the reason is that the surface of oil droplets has negative charges, and through charge neutralizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/56C08F226/02B01D17/05
CPCB01D17/047C08F292/00C08F220/56C08F226/02
Inventor 华朝王秀军张健康晓东靖波陈文娟张世仑耿宏坤李仲伟谭业邦
Owner CHINA NAT OFFSHORE OIL CORP
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