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A kind of polyquaternary ammonium salt inverse demulsifier and preparation method thereof

An inverse demulsifier and multi-quaternary ammonium salt technology, which are used in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc., can solve the complex preparation process, poor demulsification effect, and low demulsification and dehydration effect. and other problems, to achieve the effect of simple synthesis process and good demulsification and dehydration effect

Active Publication Date: 2020-08-21
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The preparation process of the multi-quaternary ammonium salt inverse demulsifier commonly seen in the market is complicated, the demulsification effect is not good, and the broad spectrum is low. It has low demulsification and dehydration effect on heavy oil oil sand mining and polymer production fluid. It is urgent to prepare a demulsifier. A reverse phase demulsifier with simple process, broad spectrum demulsification and high efficiency

Method used

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  • A kind of polyquaternary ammonium salt inverse demulsifier and preparation method thereof
  • A kind of polyquaternary ammonium salt inverse demulsifier and preparation method thereof
  • A kind of polyquaternary ammonium salt inverse demulsifier and preparation method thereof

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Embodiment 1

[0012] Add 69g of polyetheramine D-230 into a four-necked flask equipped with a thermometer, a reflux condenser and a stirrer, and slowly add 55.5g of epichlorohydrin dropwise at 40-50°C, n(D-230) / n (Epichlorohydrin) ratio is 1:2. After the dropwise addition, keep warm for 4-5h, raise the temperature to 85-90°C and start adding 53.4g N,N-dimethylethanolamine dropwise, keep warm for 5-6h. The product was purified by absolute ethanol-ethyl acetate and vacuum-dried to obtain a light yellow viscous product, that is, multi-quaternary ammonium salt inverse demulsifier Y-562. See figure 1 .

Embodiment 2

[0014] Add 23g of polyetheramine D-230 into a four-necked flask equipped with a thermometer, a reflux condenser, and a stirrer, and slowly add 74g of epichlorohydrin dropwise at 40-50°C, n(D-230) / n( Epichlorohydrin) ratio is 1:4. After the dropwise addition, keep warm for 4-5h, heat up to 85-90°C and start adding 71.2g of N,N-dimethylethanolamine dropwise, keep warm for 5-6h. The product was purified by absolute ethanol-ethyl acetate and vacuum-dried to obtain a light yellow viscous product, that is, multi-quaternary ammonium salt inverse demulsifier Y-564.

[0015] The infrared spectrum of polyetheramine D-230 and Y-564 is shown in figure 2 with image 3 . figure 2 Middle: at 3362cm -1 and 3289cm -1 The peak at is saddle-shaped, which is the symmetric and asymmetric stretching vibration peak of N—H in primary amine; 1590cm -1 is the in-plane bending vibration peak of N—H; 1109cm -1 The C-O-C stretching vibration peak. image 3 Middle: 3384cm -1 The stretching vibrat...

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Abstract

The invention relates to a preparation method of a multi-quaternary ammonium reverse demulsifier and relates to the field of treatment on high-water content crude oil produced by oil extraction in land oilfields and sea oil fields. The preparation method comprises slowly adding epichlorohydrin into polyether amine D-230 at 30-50 DEG C drop by drop under control of a mole ratio of n(D-230) / n(epichlorohydrin) of 1: 2 or 1: 4, then carrying out a thermal insulation reaction process for 4-5h to produce an intermediate, heating the intermediate to 85-90 DEG C, adding N, N-dimethylethanolamine intothe intermediate drop by drop at 85-90 DEG C, wherein the mole amount of the N, N-dimethylethanolamine is equal to that of epichlorohydrin, carrying out a thermal insulation reaction process for 5-6h,purifying the reaction product through absolute ethanol-ethyl acetate and carrying out vacuum drying to obtain the faint yellow viscous multi-quaternary ammonium salt reverse demulsifier. The multi-quaternary ammonium salt reverse demulsifier has excellent demulsification and dehydration effects.

Description

technical field [0001] The invention relates to the field of oilfield chemicals, in particular to a preparation method of a multi-quaternary ammonium salt reverse-phase demulsifier in the field of processing crude oil with high water content produced by oil recovery in land oilfields and offshore oilfields. Background technique [0002] At present, most oilfields in my country have entered the stage of high water-cut oil recovery in the middle and late stages. Although the use of oil recovery technologies such as polymer flooding, surfactant flooding, and ASP flooding has increased the recovery of crude oil, due to the polymer and surface activity in the produced fluid The interaction of solvents and water-insoluble particles makes the produced fluid a complex oil-water system, and the treatment of these severely emulsified crude oil with high water content brings new challenges to oilfield production. Therefore, the development of inverse demulsifiers with high-efficiency de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04C08G65/337C08G65/333
CPCC08G65/33396C08G65/337C10G33/04C10G2300/1033
Inventor 王惠姚光源潘月秋魏淸张迪彦章甦
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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