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Improving the fluidity of waxy oil with different pour point depressants (PPDs) at low temperature is of great technical and economic interest. In the present work, a nanocomposite pour point depressant (NPPD) which was developed based on melt blending of organically modified montmorillonite and ethylene/vinyl acetate (EVA) copolymer has been investigated systematically. The microscopic properties...
The effects of blended additive on properties of bio oil were investigated by adding n-butanol, dimethyl sulfoxide (DMSO) and ethyl acetate to bio-oil. The blended additive, which consisted of 2.421 wt% n-butanol, 2.327 wt% DMSO and 3.252 wt% ethyl acetate, was obtained through simplex lattice of mixture design. A 24h aging experiment at 80°C revealed that blended additive can improve bio-oil stability,...
The main purpose of this study is to improve the numerical evaluation of gas injection enhanced coalbed methane (ECBM) recovery by establishing a new mathematical coalbed methane (CBM) simulation model, in which the two-dimensional Peng–Robinson equation of state (2D PR EOS) model and the Maxwell-Stefan bidisperse pore diffusion (MS-BPD) model for multicomponent gas adsorption and diffusion are implemented...
A polyamidoamine (PAMAM) dendrimer was grafted onto magnetic multi-walled carbon nanotubes (m-MWCNTs) to combine magnetic properties with a large surface functionalized with amino groups. Based on three dimensional structural (3D) analysis of enzyme, oriented-immobilization of Rhizomucor miehei lipase (RML) on the obtained m-MWCNTs-PAMAM matrix was achieved. The recovery activity of the immobilized...
In this work a series of coal-based active carbon (AC) catalysts, combined with metal oxides, were prepared by sol–gel method for carbon disulfide (CS 2 ) hydrolysis and their performances for CS 2 hydrolysis were investigated. The influences of preparing the conditions for catalytic activities were studied, namely, the kinds and amount of metal oxide, the calcination temperature,...
Laboratory methods to simulate the short-term and long-term aging occurring during the service life of asphalt binder in a pavement are standardized, and the influence of ultraviolet (UV) radiations is ignored. The thermal and UV aging of asphalt binders must be considered in the study of the performance of asphalt pavement, especially in geographical regions where high solar radiation intensity occurs...
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