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Aqueous emulsions containing ethylene-vinyl acetate copolymers, preparation process thereof and their use as Anti-gelling additives of crude oils

A vinyl acetate and water-based emulsion technology, which can be used in fuel additives, petroleum industry, liquid carbon-containing fuels, etc., and can solve problems such as low concentration

Active Publication Date: 2018-08-03
VERSALIS SPA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this type of application, the presence of organic solvents, also in low concentrations, is a disadvantage since it constitutes a complication from an environmental point of view

Method used

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  • Aqueous emulsions containing ethylene-vinyl acetate copolymers, preparation process thereof and their use as Anti-gelling additives of crude oils
  • Aqueous emulsions containing ethylene-vinyl acetate copolymers, preparation process thereof and their use as Anti-gelling additives of crude oils
  • Aqueous emulsions containing ethylene-vinyl acetate copolymers, preparation process thereof and their use as Anti-gelling additives of crude oils

Examples

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preparation example Construction

[0087] Accordingly, another form of the invention is a process for the preparation of an aqueous emulsion as described and claimed in this disclosure, the process comprising the steps of:

[0088] i. High boiling organic solvents or mixtures thereof, primary emulsifiers, at a temperature which must be above the highest melting point of all polymers present and wherein the ratio between said polymer and said organic solvent is at least 1 / 1 Precursors (preferably organic acids), ethylene-vinyl acetate copolymers and / or polyalkyl (meth)acrylates are mixed together to form an organic solution;

[0089] ii. cooling said organic solution at a temperature less than or equal to 95°C, or pressurizing under a pressure sufficient to avoid rapid evaporation of water;

[0090] iii. Adding an aqueous alkaline solution to said cooled or pressurized solution to completely neutralize the organic acid present, thereby creating a primary emulsifier and forming an inverse emulsion comprising an a...

Embodiment 1

[0116] In a glass reactor, at 110°C, xylene (δ=18MPa 1 / 2 ), heat-dissolve a mixture of 6 parts of oleic acid and 100 parts of ethylene-vinyl acetate resin as a pour point depressant. Copolymer of VA and 25 g / 10' (72%) flow index, EVA copolymer composition characterized by 40% VA and 60 g / 10' (14%) flow index. The copolymer / solvent ratio is equal to 1 / 1. The mixture was cooled at 90° C. to achieve complete neutralization before adding 16 parts of 7.5% KOH solution. Then 185 parts of deionized water containing 1 part of the anionic surfactant, alkyl-diphenyl ether disulfonate (sodium dodecyl diphenyl ether disulfonate) was added at room temperature. At 25% active phase (ie pour point depressant additive) an emulsion was obtained in which the dispersed phase was characterized by an average particle size of about 1.3 [mu]m.

Embodiment 2

[0118] Use the distillate of high boiling point aromatic solvent as solvent (δ=17.5-18MPa 1 / 2 ,T eb =179° C.), ie heavy aromatic naphtha, was prepared in the same manner as described in Example 1.

[0119] At 25% active phase an emulsion was obtained in which the dispersed phase was characterized by an average particle size of about 950 nm.

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Abstract

The present invention relates to an aqueous emulsion comprising: a) from 50% to 60% of an organic phase dispersed in an aqueous phase, said organic phase containing a mixture including from 24% to 30%, calculated with respect to the final emulsion, of ethylene-vinyl acetate copolymers and / or polyalkyl(meth)acrylates, indicated in the present description as polymeric component, and a high-boiling organic solvent, or a mixture of said solvents; b) a primary emulsifier at a concentration higher or equal to 0.1% and lower than or equal to 3% by weight, calculated with respect to the final emulsion; and c) from 37% to 47% of an aqueous phase, wherein the ratio between said polymer component and said organic solvent in the final aqueous emulsion is at least 1 / 1 and where the organic solvent andany polymer of the polymeric component have a Hildebrand solubility parameter [delta] such that the difference ([delta]solvent_[delta]polymer) is lower than 2 in absolute value for any polymer of thepolymeric component.

Description

technical field [0001] The invention relates to an aqueous emulsion containing ethylene-vinyl acetate copolymer and / or polyalkyl (meth)acrylate and a preparation method thereof. [0002] Furthermore, the present invention relates to the use of said aqueous emulsion as an anti-gelling additive (here denoted "pour point depressant" additive or PPD) of crude oil. [0003] Furthermore, the present invention relates to a new method for the preparation of aqueous emulsions containing ethylene-vinyl acetate copolymers and / or polyalkyl (meth)acrylates which are easily injected into oil pipes. [0004] The invention applies to the field of "pour point depressants", i.e. substances mainly of a polymeric nature capable of interacting with the paraffins present in waxy crude oils, thereby preventing their crystallization and lowering the gelation temperature or converting the treated fluid to The "pour point" of a substance is lowered below a specific threshold to be considered suitable ...

Claims

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Application Information

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IPC IPC(8): C08J3/05C08J3/07C10L1/197C10L10/16C08L23/08C08K5/01
CPCC08K5/01C10L1/1973C10L10/16C08L23/0853C08L2201/54C10L1/143C10L1/1608C10L1/1616C10L1/1963C08J3/03C08J2323/08C08J2333/06C08J2423/08C08J2433/10C08L33/10C08L33/12C08J3/05C08J3/07C08L23/08C10L1/16C10L1/197
Inventor 亚历山德罗·卡萨利尼米歇拉·艾格诺利保罗·马里亚尼罗马诺·利玛马西莫·梅利尼
Owner VERSALIS SPA
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