Dispersions of acrylic polymer latex as additives for the inhibition of the deposition of paraffins in crude oils and compositions that contain them
a technology of acrylic polymer latex and additives, which is applied in the field of crude oil paraffin deposition inhibition and additives, can solve the problems of increasing the transport and/or operating costs of this type of additive, the inability to implement, and the high cost of the process, so as to reduce the amount of organic co-solvents and surfactants
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example 2
[0049] By way of comparison, a solution with 5.5% of the product that is obtained in Comparison Example 1 in its aromatic synthesis solvent that will be called S2 is prepared. This dilution operation is essential for implementing the product, taking into account its solidification point.
[0050] Solutions S1 and S2 are respectively added to the Itteville crude at variable concentrations, and pour points (PE) of the crude oils that are thus added are measured according to the method that is described above. The table below lists the values of the pour point that are expressed in ° C.
Concentration* (ppm)0100200500PE(S1)12−12−18−27PE(S2)12−9−9−15
*The concentration is expressed in equivalent terms of the product of Comparison Example 1 with 55% dry extract.
[0051] It clearly appears that dispersion S1 is a very effective additive for lowering the pour point of the Itteville crude oil without requiring any dilution for its use.
example 3
[0052] The procedure is performed according to the operating mode that is described in Example 1, but by eliminating the monomethyl ether dipropylene glycol and by replacing a portion of the 169 g of behenyl acrylate by 25 g of N-vinyl pyrrolidone.
[0053] The latex dispersion that is thus obtained as is, named S3, is used to add the Itteville crude. The table below lists the values of the pour point expressed in ° C.
Concentration* (ppm)0500PE(S3)12−18
*The concentration is expressed in equivalent terms of the production of Comparison Example 1 with 55% dry extract.
[0054] It is noted that solution S3 according to the invention, added to the Itteville crude, lowers in particular the pour point as the table above shows.
example 4
[0055] Into a one-liter, double-wall reactor that is equipped with a stirring mechanism, a thermometer, a reflux condenser, a nitrogen intake and a bath that is thermostated to 50° C., 225 g of demineralized water, 81 g of Dowanol DPM, 18 g of Sc, 4 g of N-alkyl dimethyl benzyl ammonium chloride and 14 g of a mixture of ethoxylated fatty alcohols of HLB 15 are introduced.
[0056] Once the temperature of 50° C. is reached by the medium, a mixture of 169 g of Norsocryl A18-22 and 0.5 g of n-dodecyl mercaptan, previously melted at 50° C., is added, and the mixture is brought to 70° C.
[0057] Then, within one minute, a solution of 1 g of 2,2′ azobis (2-amidinopropane) dihydrochloride in 20 g of demineralized water is introduced.
[0058] After the exothermy peak, the reaction is allowed to take place for 2 hours, then it is cooled to ambient temperature.
[0059] After filtration on a 100 μm filter, a stable latex dispersion is obtained with about 35% dry extract.
[0060] The latex dispersion...
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Abstract
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