Polymers
·
2026
·Vol. 18
·期 11
·1295
·
IF 5.8
Borui Ji,Shuo Wang,Bauyrzhan Sarsenbekuly,Zhen Tao,Lijie Qi,Wanli Kang,Weiyu Duan,Hongbin Yang,Bo Zhang
Heavy oil production and transportation are often restricted by high viscosity, poor mobility, and unfavorable low-temperature flow behavior, especially in waxy systems. While conventional polymer-based additives improve flow, they suffer from inadequate thermal stability, poor dispersibility in complex crude oil matrices, and insufficient multifunctionality. To address these issues, a nano-SiO2-based organic-inorganic hybrid flow improver, denoted as NSDA, was synthesized via in situ free-radical copolymerization of styrene, docosyl methacrylate, acrylic acid, and acrylamide on 3-(trimethoxysilyl)propyl methacrylate (KH-570)-modified silica surfaces. Characterization revealed that this core-shell nanohybrid structure significantly improved thermal stability and oil-phase dispersibility, maintaining nanoscale dispersion in xylene. A remarkable viscosity reduction rate of 90.2% was achieved, accompanied by a substantial pour point depression of 11 °C using only 0.5 wt% of NSDA in Liaohe heavy oil. This dual-functional performance is mainly attributed to the combined effects of the robust nano-SiO2core and the multifunctional polymer shell, Specifically, the performance is driven by synergistic wax crystal regulation at low temperatures, alongside weakened intermolecular associations among polar heavy components and nanoparticle-assisted dispersion that govern viscosity reduction.
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DOI
PubMed
高影响因子
Fluids
·
2026
·Vol. 11
·期 5
·124
·
IF 2.1
Assel Begimova,Zhanna Nadirova,Kazim Nadirov,Gulmira Bimbetova,Berik Sakybayev
Pour point depressants (PPDs) based on functionalized polyolefins were obtained and evaluated for their efficiency in pour point reducing of Kumkol waxy crude oil (Kazakhstan), which contains 15.2 wt.% paraffin and has a pour point of +17 °C. An ethylene–propylene copolymer (EPR-505A) was treated through grafting of maleic anhydride (MA-g-PO) and then converted into three different derivatives that had an identical polymer backbone: an ester-functionalized, an amide-functionalized, and a combined ester–amide additive. The obtained products were tested at 500 g/t through kinematic viscosity measurements, equilibrium and kinetic interfacial tension analysis, pour point determination, cooling curve analysis, and optical microscopy. The ester derivative reduced the pour point by 7 °C, the amide derivative did so by 5 °C, and the combined additive achieved a 10 °C pour point reduction and a more than twofold decrease in kinematic viscosity at 0 °C. Interfacial tension measurements and adsorption kinetics allowed us to assume that ester groups govern macromolecular solubility and diffusion mobility, while amide groups enhance adsorption affinity at paraffin crystal surfaces. Their combined action shifts crystallization from a collective to a dispersed regime. These findings establish structure–activity relationships between polar group architecture and PPD efficiency.
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DOI
高影响因子
ENERGY & FUELS
·
2026
·
IF 6
Zhen Tao,Bauyrzhan Sarsenbekuly,Wanli Kang,Borui Ji,Wenwei Wu,Hongbin Yang,Yuqin Tian,Shaohua Chen,Xuming Yang
In heavy crude oil reservoirs where thermal recovery is limited by geological or operational constraints, nano-assisted viscosity reduction has been increasingly recognized as a promising strategy to enable efficient cold production. In this study, a novel POSS-containing amphiphilic branched polymer viscosity reducer (HN-Z) based on nanoalkene polyhedral oligomeric silsesquioxane (POSS) was synthesized via free-radical polymerization using PSS-octavinyl POSS, hexadecyl dimethyl allyl ammonium chloride (C16DMAAC), allyloxy polyethylene glycol (APEG-8), and acrylamide (AM). Structural characterization indicates the successful incorporation of POSS nanocage units into an amphiphilic polymer framework, forming a POSS-containing branched nanostructured polymer. Performance evaluation using M138 heavy crude oil demonstrated that HN-Z exhibits excellent apparent viscosity reduction performance via emulsification, strong emulsification performance, and good adaptability to reservoir conditions. The reagent maintained high viscosity reduction efficiency in the presence of reservoir minerals and showed outstanding oil-washing ability as well as good universality for heavy crude oil from different oilfields. Compatibility tests and physical simulation flooding experiments further confirmed that HN-Z possesses good compatibility with polymer systems and can effectively enhance heavy crude oil recovery. These results indicate that the POSS-based viscosity reducer provides a promising strategy for improving heavy crude oil mobility in chemical-assisted cold production.
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DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 10
·3203
·
IF 2.8
Kaster Kamunur,Olesya Tyumentseva,Lyazzat Mussapyrova,Aisulu Batkal,Ardak Karagulanova,Rashid Nadirov
Coal ash represents an abundant secondary resource of rare earth elements (REEs), but their recovery is hindered by low concentrations in leachates and the presence of large amounts of competing matrix elements such as Fe, Al, Ca, and Mg. In this study, a stepwise pH-controlled precipitation approach was applied to real sulfuric acid coal ash leachates for selective recovery of Ce and La. The process combined impurity scrubbing, oxidative precipitation of Ce, and phosphate precipitation of La. Nearly complete recovery was achieved, with >95% of both Ce and La recovered and >99% phase purity. Selectivity analysis further demonstrated strong discrimination of REEs over matrix elements, with Ce showing >400 selectivity over Fe, Al, and Ca, and La showing ~170 over the same ions and ~17 over Ce. These results show the efficiency of the approach under realistic multi-element conditions.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）