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Composite flocculating agent

A composite flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as unretrieved technologies, and achieve the effect of high effective content, simple operation steps, and high cationicity

Active Publication Date: 2014-01-22
中海油(天津)油田化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, through literature search, the same technology as the present invention is not retrieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Prepare polyelectrolyte first, and then prepare composite flocculant. There are six methods for preparing composite flocculants.

[0023] Method 1: Prepare a composite flocculant with a binary copolymer of acrylamide and acrylamidopropyltrimethylammonium chloride as a polyelectrolyte and liquid polyferric chloride with a concentration of 5-20% as a Lewis acid

[0024] Disodium edetate and deionized water are 5.0×10 in mass ratio －4 :78, stir and dissolve evenly, add acrylamide, acrylamide propyl trimethylammonium chloride, the molar ratio of the two monomers is 1:3, heat up to 30°C, stir and dissolve and protect with nitrogen for 0.5 hours; add 2, 2'-Azobis(2-methylpropionamidine) dihydrochloride initiates the polymerization reaction at 45°C for 12 hours, 2,2'-Azobis(2-methylpropionamidine) dihydrochloride accounts for 2 The ratio of the total mass of the monomer is 0.045%, the temperature is raised to 90°C and the reaction is kept for 4 hours, the temperat...

Embodiment 2

[0052] Example 2: A one-step method directly prepares a composite flocculant, that is, synchronously reacts monomers for preparing polyelectrolytes and Lewis acid to prepare a composite flocculant. There are six methods for preparing composite flocculants.

[0053] Method 7: One-step direct preparation of composite flocculant from acrylamide, acrylamidopropyltrimethylammonium chloride, and liquid polyaluminum chloride with a concentration of 5-20%

[0054] Add disodium ethylenediaminetetraacetic acid, deionized water, 5-20% liquid polyaluminum chloride, acrylamide, and acrylamidopropyltrimethylammonium chloride into the reaction kettle at the same time, in which ethylenediaminetetraacetic acid The mass ratio of disodium and deionized water is 5.0×10 － 4 :78, the molar ratio of acrylamide and acrylamidopropyltrimethylammonium chloride two monomers is 1:3, and the mass-to-total mass ratio of liquid polyaluminum chloride with a concentration of 5-20% is 8:9 , raised the temper...

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Abstract

The invention discloses a composite flocculating agent. The flocculating agent consists of polyelectrolyte and Lewis acid in mass ratio of (8:1)-(3:1), wherein the composite flocculating agent is prepared by the steps of mixing the polyelectrolyte and the Lewis acid at 20-50 DEG C, then reacting for 0.5-4 hours while stirring at 20-50 DEG C, cooling to room temperature and discharging materials, thus obtaining the composite flocculating agent. The composite flocculating agent is applicable to an offshore oilfield wastewater treatment system, and is capable of solving the problem of difficult wastewater treatment due to output liquid variation on an offshore oilfield as well as overcoming shortcomings of high agent dosage, poor effect and high traffic volume in the prior art. Therefore, the quality of injected water or discharged seawater achieves the standard; the preparation method of the composite flocculating agent is simple, production steps are reduced and the production cost is lowered.

Description

technical field [0001] The field of the invention is industrial wastewater treatment technology, and relates to a composite flocculant. Background technique [0002] The status quo of offshore oilfield sewage treatment is firstly that the liquid production rate has increased significantly, and the residence time of the oil-water mixture in the treatment process has been shortened sharply; secondly, the composition of the produced liquid is complex. Due to the extensive use of production stimulation measures such as well workover, thermal recovery, and polymer injection in oilfields, a large amount of organic and inorganic substances with complex components are injected into the formation, and these substances return a large amount of sediment, which increases the degree of emulsification of the return fluid , which brought great difficulties to the later treatment; third, the on-site equipment is aging and the oil collection efficiency is reduced, which increases the oil con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 吴结丰郭海军
Owner 中海油(天津)油田化工有限公司
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