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Reusable carbon-based nano demulsifier and preparation method thereof

A technology of carbon-based nano and demulsifiers, which is applied in separation methods, chemical instruments and methods, and separation of immiscible liquids, etc., can solve problems such as complex preparation processes, and achieve simple preparation methods, good demulsification effects, and clear water phases Effect

Active Publication Date: 2019-12-13
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned demulsifiers have good demulsification properties and can be regenerated and recycled, there are many problems such as complicated preparation process.

Method used

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  • Reusable carbon-based nano demulsifier and preparation method thereof
  • Reusable carbon-based nano demulsifier and preparation method thereof
  • Reusable carbon-based nano demulsifier and preparation method thereof

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preparation example Construction

[0018] In a first aspect, the present invention provides a method for preparing a reusable carbon-based nano-demulsifier, such as figure 1 , the preparation method comprises the following steps:

[0019] (1) carbon nanotubes react with mixed acid solution to obtain oxidized carbon nanotubes containing hydroxyl and carboxyl groups on the surface;

[0020] (2) Nano-TiO produced by hydrolysis of organotitanium precursor 2 Grafted onto the surface of oxidized carbon nanotubes to obtain a reusable carbon-based nanodemulsifier.

[0021] According to the present invention, the carbon nanotube described in step (1) reacts with the mixed acid solution to obtain the oxidized carbon nanotube containing hydroxyl and carboxyl on the surface, comprising the following steps:

[0022] (a) uniformly mixing nitric acid and sulfuric acid to obtain a mixed acid solution;

[0023] (b) adding carbon nanotubes to the above-mentioned mixed acid solution, and stirring to obtain a suspension;

[00...

Embodiment 1

[0066] This embodiment provides a reusable carbon-based nano demulsifier, which is obtained through the following steps:

[0067] Mix 100 parts by weight of concentrated nitric acid and 33 parts by weight of concentrated sulfuric acid to obtain a mixed acid solution; then add 1 part by weight of carbon nanotubes to the above mixed acid solution, and stir at a temperature of 80°C for 12 hours to obtain a suspension ; The above-mentioned suspension is centrifuged at a speed of 4100rpm, and repeatedly washed with deionized water until it is neutral to obtain a black product; finally, the obtained black product is vacuum freeze-dried to obtain carbon oxide nanotubes containing hydroxyl and carboxyl groups on the surface , wherein the vacuum freeze-drying temperature is -40°C, and the vacuum freeze-drying time is 36h.

[0068] 25 parts by weight of isopropyl titanate were dissolved in 200 parts by weight of absolute ethanol, and mixed solution I was obtained after stirring for 1 h,...

Embodiment 2

[0071] This embodiment provides a reusable carbon-based nano demulsifier, which is obtained through the following steps:

[0072] Mix 100 parts by weight of concentrated nitric acid and 33 parts by weight of concentrated sulfuric acid to obtain a mixed acid solution; then add 0.75 parts by weight of carbon nanotubes to the above mixed acid solution, and stir at a temperature of 70°C for 24 hours to obtain a suspension centrifuge the above suspension at a speed of 5000rpm, and repeatedly wash with deionized water until it is neutral to obtain a black product; finally carry out vacuum freeze-drying of the obtained black product to obtain oxidized carbon nanotubes containing hydroxyl and carboxyl groups on the surface , wherein the vacuum freeze-drying temperature is -30°C, and the vacuum freeze-drying time is 48h.

[0073] Dissolve 20 parts by weight of tetraisobutyl titanate in 200 parts by weight of isopropanol, and stir for 0.5 h to obtain mixed solution I, wherein the stirri...

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Abstract

The invention discloses a reusable carbon-based nano demulsifier and a preparation method thereof. The preparation method comprises the following steps: carrying out a reaction on carbon nano tubes with a mixed acid solution to obtain oxidized carbon nano tubes with hydroxyl and carboxyl on the surfaces; and grafting nano TiO2 generated by hydrolysis of an organic titanium precursor onto the surfaces of the oxidized carbon nano tubes to obtain the reusable carbon-based nano demulsifier. The invention also discloses the demulsifier obtained by the preparation method. The provided preparation method of the demulsifier is simple, green and environmentally friendly. The demulsifier can be used to quickly demulsify stable oily wastewater at normal temperature, and particularly has a good demulsification effect on oily wastewater with an oil content of 1%; and the water phase is clear and can be recycled.

Description

technical field [0001] The invention relates to oil field chemicals, in particular to a reusable carbon-based nano demulsifier and a preparation method thereof. Background technique [0002] Petrochemical production will produce a large amount of oily wastewater. If these oily wastewater is discharged directly without treatment, it will have a great impact on the natural environment and eventually threaten human health. Therefore, the treatment of oily wastewater is very necessary. Among them, chemical demulsification has become one of the most widely used methods in the treatment of oily wastewater due to its simple process and low cost. However, its disadvantage is that most of the demulsifiers currently used cannot be reused, which increases the cost of chemical demulsification on the one hand, and on the other hand, the demulsifiers present in the oil phase or water phase may also affect subsequent demulsification. process has adverse effects. [0003] Chinese patent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/04C02F1/40C02F103/36
CPCB01D17/047C02F1/40C02F2103/365
Inventor 米远祝江夏匡家哲郭萍叶泛黄志明罗跃谢芳琴袁怀奎张泽俊
Owner YANGTZE UNIVERSITY
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