Preparation method of cheap ultra-filtration membrane for treating oil producing wastewater

A technology for oil extraction wastewater and ultrafiltration membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of harsh operating conditions, a large amount of scum, and high energy consumption, and achieves low preparation costs and operating costs. Small, simple craftsmanship

Active Publication Date: 2015-01-07
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the traditional oilfield produced water treatment process adopted by most oilfields in China has certain effects, there are many problems after treatment: for example, the oil trap can only remove large-sized oil droplets, but cannot remove emulsified oil and dissolved oil in water ; Centrifugal separation is effective in treating dispersed oil and emulsified oil, but the energy consumption is high, and the operating conditions are harsh; when the air flotation method separates the oil-water emulsion, a large amount of chemicals needs to be added, and a large amount of scum is generated, which re

Method used

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  • Preparation method of cheap ultra-filtration membrane for treating oil producing wastewater
  • Preparation method of cheap ultra-filtration membrane for treating oil producing wastewater
  • Preparation method of cheap ultra-filtration membrane for treating oil producing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Dissolve 3g of nano-silica in 159g of N-N dimethylacetamide solvent (DMAc), and disperse under ultrasonic conditions for 30min, then mix 12g of polyvinylpyrrolidone, 2g of Tween 80, and 24g of polyvinyl chloride resin powder Add them to the nanoparticle suspension in turn under stirring, and stir evenly in a water bath at 30° C. for 24 hours. After it was completely dissolved, it was placed in a vacuum drying oven at 30°C (vacuum degree: 0.08MPa) and allowed to stand for defoaming for more than 12 hours. Then, use the L-S phase inversion method to form a film with a scraper machine in an environment with a temperature of 25°C and a humidity of 65%. After volatilizing for 15 seconds, put it into a 30% DMAc coagulation solution. After the film is automatically peeled off, the newborn Put the diaphragm into pure water and fully soak it for 48 hours to obtain a nano-silica modified polyvinyl chloride flat separation membrane.

[0040] The characteristics of the flat membra...

Embodiment 2

[0042] Place the flat film made in Example 1 into an aqueous solution containing 30% glycerin and soak for 24 hours. After air-drying naturally, cut two diaphragms of the same size, and place the two diaphragms on several layers of plastic mesh with higher strength. Then seal its four sides into a U-shaped plexiglass frame, seal with epoxy resin, set a water outlet at one end of the diaphragm, and connect a pressure gauge and a peristaltic pump with a variable-diameter elbow. A nano-silica modified polyvinyl chloride flat membrane module is prepared.

[0043] The characteristics of the flat membrane module are: the membrane module is easy to assemble, and the materials are simple and easy to obtain. It is very suitable for use as a small test device in the experiment to simulate the process of ultrafiltration membrane treatment of a specific wastewater.

Embodiment 3

[0045] Dissolve 3g of nano-silica in 159g of N-N dimethylacetamide solvent (DMAc), and disperse under ultrasonic conditions for 30min, then mix 8g of polyvinylpyrrolidone, 2g of Tween 80, and 28g of polyvinyl chloride resin powder Add them to the nanoparticle suspension in turn under stirring, and stir evenly in a water bath at 30° C. for 24 hours. After it was completely dissolved, it was placed in a vacuum drying oven at 30°C (vacuum degree: 0.08MPa) and allowed to stand for defoaming for more than 12 hours. Then, use the L-S phase inversion method to form a film with a scraper machine in an environment with a temperature of 25°C and a humidity of 65%. After volatilizing for 1 min, put it into a coagulation bath containing pure water. After the film peels off automatically, the new film Put the sheet into pure water and fully soak for 48 hours to obtain a nano-silica modified polyvinyl chloride flat separation membrane.

[0046] The characteristics of the flat membrane are:...

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Abstract

The invention provides a preparation method of a cheap ultra-filtration membrane for treating oil producing wastewater. The preparation method comprises the following steps: dissolving nano silicon dioxide into a polyvinyl chloride dissolving solvent under ultrasonic condition to prepare a suspension solution of nano particles; then sequentially and slowly adding a pore-forming agent, a de-foaming agent and polyvinyl chloride into the suspension solution; continuously and mechanically agitating in a water bath of 30-40 DEG C for more than 24 hours until a homogeneous membrane casting solution is formed; sufficiently de-foaming the membrane casting solution in a vacuum drying box and scraping a membrane by using a membrane scraping machine; after volatilizing the scraped new membrane in the air for 15-60 seconds, slowly putting the scraped new membrane into a coagulating bath for coagulation; and after separating the membrane from a glass plate, sufficiently immersing the membrane in pure water for 48 hours to obtain a nano silicon dioxide modified polyvinyl chloride flat plate membrane. The preparation method of the cheap ultra-filtration membrane can be used for nano silicon dioxide polyvinyl chloride hollow fiber type ultra-filtration membranes and micro-filtration membranes, reverse osmosis membranes, nano-filtration membranes, pipe type membranes, capillary tube membranes or spiral-wound membranes.

Description

technical field [0001] The invention relates to a preparation method of an ultrafiltration membrane. Background technique [0002] With the vigorous development of the petroleum industry and the wide application of water injection technology in petroleum exploitation, a large amount of oil production wastewater has caused serious impact on the local ecological environment. Although the traditional oilfield produced water treatment process adopted by most oilfields in China has certain effects, there are many problems after treatment: for example, the oil trap can only remove large-sized oil droplets, but cannot remove emulsified oil and dissolved oil in water ; Centrifugal separation is effective in treating dispersed oil and emulsified oil, but the energy consumption is high, and the operating conditions are harsh; when the air flotation method separates the oil-water emulsion, a large amount of chemicals needs to be added, and a large amount of scum is generated, which req...

Claims

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Application Information

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IPC IPC(8): B01D71/30B01D69/06B01D69/08B01D67/00
Inventor 赵方波于振江梁肖阳张付爽卢佳琪赵元元
Owner HARBIN ENG UNIV
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