Comb-like Polymeric Pour Point Depressants with Aromatic Pandents and Asphaltenes Synergistically Improve the Flow Behavior of Model Waxy Oils †

doi:10.7503/cjcu20190394

Abstract

Abstract:

The influence of poly-octadecyl acrylate-maleic anhydride(POM), poly-octadecyl acrylate-maleic anhydride-aniline(POMA) and poly-octadecyl acrylate-maleic anhydride-naphthylamine(POMN) copolymers on the flowability of model waxy oil with/without asphaltenes was investigated through rheological tests, differential scanning calorimeter(DSC) analysis, microscopic observation and asphaltenes precipitating tests. The results showed that the above three types of comb-like polymeric pour point depressants(PPDs) could improve the flowability of the model waxy oil without asphaltenes(MO-1) to some extent and the POM showed the best flow improving efficiency on the MO-1: after adding 500 mg/kg POM, the pour point of the MO-1 decreased from 29 ℃ to 23 ℃ and yield stress reduced from 62.20 Pa to 83.35Pa. Comb-like polymers could significantly improve the flowability of model waxy oil with 0.3% asphaltenes(MO-2), and MO-2 showed the best flowability after the addition of 500 mg/kg POMA: the pour point and yield stress of MO-2 dropped to 3 ℃/1.27 Pa, respectively. Therefore, the comb-like polymeric PPDs and asphaltenes can synergistically improve the flowability of waxy oils and the introduction of aromatic pendants in the POM molecules can enhance the interaction of comb-like polymeric PPDs and asphaltenes, thus further increasing the synergistic effect of comb-like polymeric PPDs and asphaltenes.

Key words: Comb-like copolymer, Asphaltene, Model waxy oil, Synergistic effect

CLC Number:

O631.1 ⁺1

TrendMD:

Fei YANG,Xiaoping ZHANG,Chuanxian LI,Bo YAO,Shutong DAI,Xue XIA,Guangyu SUN. Comb-like Polymeric Pour Point Depressants with Aromatic Pandents and Asphaltenes Synergistically Improve the Flow Behavior of Model Waxy Oils ^†[J]. Chem. J. Chinese Universities, 2019, 40(12): 2606.

Figures/Tables 10

Fig.1 Carbon number distribution of the mixed paraffin wax

Scheme 1 Chemical structures of POM, POMA and POMN

Fig.2 1H NMR spectra of POM(A), POMA(B) and POMN(C)

Fig.3 Crystallization exothermic curves of POM(a), POMA(b) and POMN(c)

System	Oil sample	Undoped	POM	POMA	POMN
Pour point/℃	MO-1	29	23	23	24
	MO-2	20	9	3	5
Yield stress/Pa	MO-1	627.20	83.35	99.89	124.08
	MO-2	84.85	10.05	1.27	4.46

Fig.4 Strain-stress curves(A, B) and flow curves(C, D) of MO-1(A, C) and MO-2(B, D) undoped(a) and doped with 500 mg/kg POM(b), POMA(c) and POMN(d)

Fig.5 Structural properties of MO-1(A) and MO-2(B) undoped(a) and doped with 500 mg/kg POM(b), POMA(c) and POMN(d) under dynamic cooling process

Fig.6 DSC curves(A, C) and percentage of precipitated waxy crystals at different temperatures(B, D) of MO-1(A, B) and MO-2(C, D) undoped(a) and doped with POM(b), POMA(c) and POMN(d)

Fig.7 Microscopic characteristics of MO-1(A—D) and MO-2(E—H) undoped(A, E) and doped with 500 mg/kg POM(B, F), POMA(C, G) and POMN(D, H), respectively

Fig.8 Percentage of precipitated asphaltenes without(a) and with the addition of POM(b), POMA(c) and POMN(d)

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