A method for preparing an inexpensive ultrafiltration membrane that can be used in the treatment of oil production wastewater

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...

AI Technical Summary

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 requires subsequent treatment ; The cost of activated carbon adsorption is high, and activated carbon is not easy to regenerate, etc.

It has been reported that nanoparticles applied to polymer blending modification mainly include nano-silica, alumina, zinc oxide, titanium dioxide, etc. There are relatively few reports on modified polymers of nano-silica, and there is no common Two kinds of nano silicon dioxide (hydrophilic and common) are applied to the report of polyvinyl chloride membrane modification, also do not apply nano silicon dioxide modified film to the report of oil production wastewater treatment

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