Investigation into a Pour Point Depressant for Shengli Crude Oil

Fang, Long; Zhang, Xiaodong; Jin-hai, MA; Zhang, Botao

doi:10.1021/ie301018r

Cited by 87 publications

(60 citation statements)

References 33 publications

(47 reference statements)

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“…17) (Fang et al 2012;Zhang et al 2009). After treated with the mixture of MAVA and EVA (mass ratio = 1:3) at the dosage of 400 ppm, the pour point of Shengli crude was dropped by 11°C.…”

Section: Newly Developed Polymersmentioning

confidence: 99%

Recent advances on mitigating wax problem using polymeric wax crystal modifier

Wei

2014

J Petrol Explor Prod Technol

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The petroleum industry has addressed wax problems since its inception. Every year, considerable resources are expended on wax removal, which accordingly cause significant economic loss. As one of the materials in chemical treatments, polymeric compounds referred to as ''wax-crystal modifier'', is being widely used to improve flow properties and/or combat wax deposition for waxy crude oils. This article reviews the recent achievements with regard to the flow improvement and wax inhibition of waxy oils using traditional polymeric wax crystal modifiers, such as ethylene-vinyl acetate (EVA), poly(ethylene-butene) (PEB), and polyethylenepoly(ethylene-propylene) (PE-PEP), as well as the development of novel polymers for potential use in the near future. The goal of this review is to assist people understand the advances in this topic.

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“…17) (Fang et al 2012;Zhang et al 2009). After treated with the mixture of MAVA and EVA (mass ratio = 1:3) at the dosage of 400 ppm, the pour point of Shengli crude was dropped by 11°C.…”

Section: Newly Developed Polymersmentioning

confidence: 99%

Recent advances on mitigating wax problem using polymeric wax crystal modifier

Wei

2014

J Petrol Explor Prod Technol

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“…As the recycled carbocoal was added to the LT‐LP process, it was observed that the −OH stretching vibration, which was attributed to the phenols shifted from ∼3400 cm −1 to ∼3300 cm −1 in the BL‐C and EL‐C. The basis for the experimental detection of a conventional hydrogen bond was the blue shift of the frequency (shift to smaller frequency) of the A‐H stretching vibration upon the intermolecular hydrogen bond formation . It was concluded that the addition of the recycled carbocoal resulted in the decline of phenols and the growth of aromatic hydrocarbons in the tar.…”

Section: Resultsmentioning

confidence: 88%

Enhancement of low‐temperature lignite pyrolysis by recycled carbocoal for high‐quality tar in fixed‐bed reactor

2019

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Lignite could be converted to high value‐added char and tar through a pyrolysis process. To improve the tar yield as well as the quality of tar/char during a low temperature (550 °C) lignite pyrolysis (LT‐LP) process, the influence of mixing inexpensive and accessible recycled carbocoal with three kinds of lignite was investigated in a fixed‐bed reactor. The LT‐LP processes with and without recycled carbocoal were investigated using a TGA and were compared in detail. The results indicated that the addition of the recycled carbocoal into the three lignite optimized the light tar yield from 4.63, 3.33, and 2.09 g/g to 10.50, 6.10, and 5.01 g/g, and improved the gasification reactivity of the chars up to 2.88, 2.58, and 2.88 h−1, respectively. To identify the role of recycled carbocoal during the LT‐LP process, the obtained products, such as tar and char, were characterized by chromatography, thermal gravimetric analyzer, chromatograph‐mass spectrometer, elemental analyzer, Fourier transform infrared spectroscopy, and scanning electron microscope. It was demonstrated that the existence of the recycled carbocoal could impede the self‐polymerization of small molecule hydrogen‐containing (SM‐HC) free radicals and cut down the reactions between SM‐HC and hydroxyl radicals at the weak‐bonds breaking zone (300–450 °C), thereby supplying sufficient free radical stabilizers for the tar intermediates at the molecular skeleton region (450–550 °C). The high‐valued tar and char were obtained. In summary, the employment of recycled carbocoal during the LT‐LP process could not only promote the economic benefit of LT‐LP products but also reduce the cost of lignite value‐added utilization.

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“…Fang Zhang, Ma and Zhang (2012) determined the influence of asphaltenes and resins on the pour point of Sengli crude (°API of 30.8 with a content of 2.63, 24.59 and 18.25% w/w of asphaltenes, resins and waxes respectively). They found that the pour point of the crude oil without asphaltenes is reduced by 2°C, and without asphaltenes or resins by 4°C, which means that these fractions, particularly asphaltenes, have the effect of increasing pour point, contrary to other research where they found that they act as natural depressants.…”

Section: Influence Of Asphaltenes On Wax Precipitationmentioning

confidence: 99%

Review of studies on asphaltene - wax interaction and the effect thereof on crystalilization

Ariza-León

Molina-Velasco

Chaves–Guerrero

2014

CT&F Cienc. Tecnol. Futuro

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T his paper reviews the impact of asphaltenes on wax crystallization and on the properties of crude oils, and the consequences thereof on the flow assurance of waxy crude oil. It initially includes studies of the crystallization of both pure n-alkanes as well as the mixtures thereof, because they have led to an understanding of how their precipitation occurs along with their transitions of crystalline phases, particularly, by studies of X-ray diffraction (XRD). This is followed by the studies and results of crystallization in crude oils and/or the fractions thereof and how their properties are affected in the presence of asphaltenes.The results on the influence of asphaltenes are inconclusive and sometimes contradictory: some confirm that their presence decreases pour point, others affirm that it increases it and yet others say there is no effect. Similar results have been reported for properties such as crystallization point, phase transition and rheological properties. The influence of the chemical structure of asphaltenes on the change in crude oil properties has not been generalized either. It has been inferred that is possibly due to the interaction between aliphatic chains of asphaltenes and waxes, and it has been established that there is synergy in coprecipitation due to evidence in the analysis of organic deposits. ABSTRACT REVISIÓN DE LOS ESTUDIOS SOBRE INTERACCIÓN ASFALTENOS Y PARAFÍNAS E INCIDENCIA EN SU CRISTALIZACIÓN 40É apresentada uma revisão do efeito que os asfaltenos têm na cristalização de parafinas, nas propriedades de crus parafínicos e nas consequências na garantia de escoamento. Inicialmente são incluídos os estudos de cristalização de n-alcanos puros e de suas misturas onde foi possível entender como ocorre sua precipitação e transições de fases cristalinas, especialmente, por estudos de difração de raios-X (DRX). São analisados os resultados de estudos de cristalização em crus e/ou suas frações e como a presença dos asfaltenos afeta suas propriedades.Sobre a influência dos asfaltenos, os resultados não são conclusivos e em ocasiões são contraditórios: alguns confirmam sua contribuição para diminuir o ponto de fluidez, outros que o aumenta e em alguns casos que não o afeta. Resultados semelhantes são relatados para o ponto de cristalização, a transição de fases e as propriedades reológicas. Também não é possível generalizar qual é a influência da estrutura química dos asfaltenos sobre as propriedades dos crus. Infere-se que possivelmente é devida à interação entre suas cadeias alifáticas com as parafinas e estabelece-se que existe sinergia na coprecipitação pela evidência nas análises dos depósitos orgânicos. Se presenta una revisión del efecto que tienen los asfaltenos en la cristalización de parafinas, en las propiedades de crudos parafínicos y las consecuencias en el aseguramiento de flujo. Inicialmente se incluyen los estudios de cristalización de n-alcanos puros y de sus mezclas donde se ha podido entender como ocurre su precipitación y transiciones de fases cristalinas, especialm...

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Investigation into a Pour Point Depressant for Shengli Crude Oil

Cited by 87 publications

References 33 publications

Recent advances on mitigating wax problem using polymeric wax crystal modifier

Recent advances on mitigating wax problem using polymeric wax crystal modifier

Enhancement of low‐temperature lignite pyrolysis by recycled carbocoal for high‐quality tar in fixed‐bed reactor

Review of studies on asphaltene - wax interaction and the effect thereof on crystalilization

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