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Modified polytetrafluoroethylene composite coalescent pack for oil-water mixed liquid separation

A technology of polytetrafluoroethylene and silanized polytetrafluoroethylene, which is applied in the field of modified polytetrafluoroethylene composite coalescence packing, can solve the problems of unstable collection of oil droplets, inability to coalesce and grow, low mechanical properties, etc. , to achieve the effect of increasing the contact area and interaction strength, improving the lipophilic and hydrophobic properties, and preventing breakage and shedding

Active Publication Date: 2020-03-31
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the modification process of polypropylene fibers involves the reaction of potassium permanganate and ethyl acrylate under strong acid conditions, it is not only dangerous, but also has poor reaction stability.
And if two kinds of fibers with completely opposite surface wetting properties are mixed and used for water deoiling applications, it will cause unstable collection of oil droplets on the surface of the fibers and cannot coalesce and grow, which is not suitable for oil-water separation in industry
[0007] PTFE has extremely high chemical corrosion resistance, and it also has certain lipophilic and hydrophobic properties, but due to its low mechanical properties, it cannot be used alone as a coalescing fiber material

Method used

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  • Modified polytetrafluoroethylene composite coalescent pack for oil-water mixed liquid separation
  • Modified polytetrafluoroethylene composite coalescent pack for oil-water mixed liquid separation
  • Modified polytetrafluoroethylene composite coalescent pack for oil-water mixed liquid separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Advanced separation treatment of oily wastewater from a refinery in Zhejiang Province

[0044] Treatment object: Oily waste water from an oil refinery in Zhejiang Province, the oil content is 20-30%, the water content is 60-70%, and the solid and other impurities account for 5-10%. The oily wastewater has an oil content of 600-1000ppm after preliminary flocculation and sedimentation treatment.

[0045] Strengthen the preparation of hydrophobically modified polytetrafluoroethylene fiber: Utilize the method described in the present invention, take the polytetrafluoroethylene fiber raw material 500g that diameter is 50 μm, utilize 50% (volume fraction) ethanol solution and 50% (volume fraction) successively Acetone solution was used to soak and clean it, and ultrasonic cleaning was used to remove impurities and oily substances on the surface of the fiber; then 35% (mass fraction) sulfuric acid solution was used to soak the pre-cleaned polytetrafluoroethylene fib...

Embodiment 2

[0048] Example 2: Advanced separation treatment of oil production wastewater in an oil production plant in Shaanxi Province

[0049] Treatment object: Oil production wastewater from an oil production plant in Shaanxi Province, with an oil content of 40-50%, a water content of 40-50%, and solids and other impurities accounting for 5-10%. The oil content of the oily wastewater after preliminary precipitation treatment is 2000-2500ppm.

[0050] The reinforced hydrophobically modified polytetrafluoroethylene fibers were prepared as described in Example 1.

[0051] Preparation of modified polytetrafluoroethylene composite coalescence filler: for the treatment of high-concentration and high-viscosity oily wastewater, 304 stainless steel fibers (200 μm in diameter) are used as the supporting skeleton, and five 304 stainless steel fibers are wound in a tooth-shaped weaving manner Strengthen the hydrophobic modified polytetrafluoroethylene fiber to ensure that the tooth shape directio...

Embodiment 3

[0053] Example 3: Advanced separation treatment of oily machining wastewater from a machinery processing plant in Jiangsu Province

[0054] Treatment object: Oily machining wastewater from a machinery processing factory in Jiangsu Province, with an oil content of 30-40%, a water content of 50-60%, and solids and other impurities accounting for 10-20%. The oil content of the oily machining waste water after preliminary filtration and sedimentation treatment is 1600-2000ppm.

[0055] The reinforced hydrophobically modified polytetrafluoroethylene fibers were prepared as described in Example 1.

[0056] Preparation of modified polytetrafluoroethylene composite coalescence filler: for the treatment of high-concentration and low-viscosity oily wastewater, 304 stainless steel fibers (200 μm in diameter) are used as the supporting skeleton, and five 304 stainless steel fibers are wound in a tooth-shaped weaving manner Strengthen the hydrophobic modified polytetrafluoroethylene fiber...

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Abstract

The invention relates to a modified polytetrafluoroethylene composite coalescent pack for oil-water mixed liquid separation. Firstly, sulfuric acid solution soaking, hydroxylation modification, silanization modification and amination end-capping reaction are combined, and an initiator, a coupling agent and an end-capping agent are matched to carry out reinforced hydrophobic modification treatmenton polytetrafluoroethylene fibers; then, the modified polytetrafluoroethylene fibers and an odd number (n is equal to 3, 5, 7,...) of metal fibers are mixed and woven into a composite coalescent material fiber bundle in a tooth-shaped structure, and then the composite coalescent material fiber bundle is woven into meshed fibers in a cross-shaped staggered mode; and finally, the plurality of meshedfibers are combined in parallel to form the composite coalescent pack. According to the composite coalescent pack, through the interception effect of the cross-shaped interwoven net structure on micro-oil drops and the capture characteristic of the tooth-shaped woven reinforced hydrophobic modified polytetrafluoroethylene fibers on the micro-oil drops, the micro-oil drops in the oil-water mixed liquid can be efficiently removed.

Description

technical field [0001] The invention relates to a modified polytetrafluoroethylene composite coalescence filler used for the separation of oil-water mixed liquid. It belongs to the technical field of water treatment. Background technique [0002] Oily wastewater mainly comes from the oil-water separation process of production equipment in petroleum refining, petrochemical, steel, mechanical processing and other industrial sectors, as well as the washing and flushing process of oil products and equipment. There are many types of oil substances, including natural petroleum and petroleum products. , tar, and emulsified oil. Oil substances exist in various forms in wastewater, which can be divided into slick oil, emulsified oil and dissolved oil, among which slick oil and emulsified oil exist in the majority. The slick oil can be better removed by filtering, standing still, flocculation, sedimentation, etc., and the oily substance that exists in the form of emulsified micro-oi...

Claims

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Application Information

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IPC IPC(8): B01J19/30C02F1/40
CPCB01J19/30B01J2219/30466B01J2219/318C02F1/40
Inventor 王炳捷白志山赵生豪杨晓勇田涛
Owner EAST CHINA UNIV OF SCI & TECH
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