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Xie Z.-F.,Yulin Teachers College | Liu G.-C.,Guangxi University | Tong Z.-F.,Guangxi University | Tong Z.-F.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2012

The adsorption properties of 2,4-dihydroxybenzoic acid by 717 (gel-type, strong base), D201 (macroporous-type, strong base) and D301R (macroporous-type, weak base) resins were studied through static and dynamic experiments. The results show that the maximum adsorption ability of 717 and D201 resins occurs at pH=4~11, and D301R resin at pH=3~9. At pH=5, 293~313 K and initial concentration of 2,4-dihydroxybenzoic acid of 0.6488~6.488 mmol/L, the adsorption isotherms of 2,4-dihydroxybenzoic acid on D301R, 717 and D201 resins obey Freundlich model, and their maximum equilibrium adsorption capacity is 2.98, 2.66 and 2.54 mmol/g, respectively (the adsorption has not reached saturation yet). The adsorptions are physical and spontaneous, exothermal processes. Pseudo first-order and pseudo second-order models were applied to correlate the kinetic experimental data. The former was more accordant with the experimental data than the latter. The 2,4-dihydroxybenzoic acid adsorbed on the three resins could be eluted by 100 mL 5%(ω) NaCl+2%(ω) NaOH solution quickly with elution rate reaching 99%. The adsorption performance of 2,4-dihydroxybenzoic acid on D301R resin was better than on that on D201 and 717 resins under the same conditions.

Xie Z.-F.,Yulin Teachers College | Tong Z.-F.,Guangxi University | Tong Z.-F.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | Chen Y.,Yulin Teachers College | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2014

The adsorption equilibrium of picric acid and 2,4-dinitrophenol onto D301R resin in aqueous solutions was studied by static method, as well as the effect of resin content, temperature and adsorbent mass concentration on the adsorption, and the characteristics of isotherm adsorption. The experimental results show that in a single solute system, the adsorption of picric acid or the 2,4-dinitrophenol decreases with the increase of the resin amount, and increases with temperature rise, which is an endothermic process. The adsorption of picric acid and 2,4-dinitrophenol by D301R resin in a single solute system obeys the Freundlich isotherm at equilibrium mass concentration of 1-350 mg/L. However in a binary solute system, the adsorption of picric acid shows a maximum with the increase of resin content, while the adsorption of 2,4-dinitrophenol is essentially the same as that of single solute. The isotherm adsorption of binary solute indicates that once the isotherm of 2,4-dinitrophenol passes a turning point, the afterward adsorption rises sharply. Unlike in the case of a single solute system, the adsorption of picric acid declines after reaching a maximum at the isotherms. The adsorptive characteristics of the picric acid and the 2,4-dinitrophenol in binary systems present a varying degree of competitive adsorption.

Jiang H.,Guangxi University | Jiang H.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | Tong T.,University of Science and Technology of China | Sun J.,Guangxi University | And 4 more authors.
Food Chemistry | Year: 2014

Muscle protein from round scad (Decapterus maruadsi) was hydrolyzed with five commercial proteases, namely, Alcalase, neutral protease, papain, pepsin, and trypsin. Round scad hydrolysate (RSH) prepared with Alcalase demonstrated high antioxidative activity. After ultrafiltration, RSH-III fraction (M W < 5 kDa) exhibited the strongest activity. Then, RSH-III was purified by gel filtration chromatography (Sephadex G-15) and separated into four fractions (A, B, C, and D), of which fraction B showed the highest antioxidative activity and was further purified using reverse-phase high-performance liquid chromatography twice. The purified peptides were identified as His-Asp-His-Pro-Val-Cys (706.8 Da) and His-Glu-Lys-Val-Cys (614.7 Da) by matrix-assisted laser desorption ionization time-of-flight/time-of-flight mass spectrometry. Subsequently, the identified peptides were synthesized, and their antioxidative activities were verified. Results indicated that the two novel peptides isolated from round scad muscle protein can be developed into antioxidative ingredients in functional foods. © 2013 Elsevier Ltd. All rights reserved.

Chen X.,Guangxi University | Chen X.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | Wei T.,Guangxi University | Wei T.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | And 4 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

Decompressing inner ebullition (DIE) is a novel method and it can achieve a rapid extraction at lower temperature for active constituents of medical plants. In this work, DIE was employed to extract puerarin from puerarin lobata (Willd.) Ohwi (PLO). The extraction conditions were investigated according single factor analysis. Experiment results showed that the extraction yield of puerarin reached a maximum value when the ethanol mass concentration in the aqueous solution immersing the PLO was 60%, the amount of ethanol solution for premaceration and of water for extraction were 1.6 and 10 mL·g -1 of PLO, respectively, the operation gauge pressure was -0.084 MPa, and the extraction temperature was 50 °C. Under the optimal conditions, the extraction kinetics of DIE was studied. The mass transfer coefficient of DIE ranged between 0.09 and 0.13 s -1, which is 183 times greater than that of ultrasonic assistant extraction under the same conditions, and its extraction activation energy δE is 10.86 kJ·mol -1. Also, the thermodynamics properties in the extraction process of DIE at 50 °C were also calculated, the enthalpy change δH is 58.76 kJ·mol -1, the entropy change δS is 224.50 J·mol -1·K -1, and Gibbs free energy δG is -13.73 kJ·mol -1, respectively. The extraction of DIE belongs to a spontaneous process with endothermic and entropy increasing. © 2012 American Chemical Society.

Wu L.,Guangxi University | Wei T.-Y.,Guangxi University | Tong Z.-F.,Guangxi University | Zou Y.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | And 2 more authors.
Fuel Processing Technology | Year: 2016

A new reaction system for biodiesel production by the base-catalyzed transesterification process has been developed. Bentonite is used as a water adsorbent in the traditional homogeneous base-catalyzed transesterification reaction system to create a heterogeneous system that improves the reaction efficiency. The influence of bentonite on the NaOH-catalyzed methanolysis of soybean oil and the accompanying reaction mechanisms were investigated. It was found that an appropriate introduction of bentonite can promote the methanolysis. By the rapidly removal of the water from the system, bentonite enhances the transformation of NaOH to the catalytically active methoxide species. Further, the main side reactions are significantly inhibited. The methanolysis of triglycerides took place in the liquid phase rather than in the solid phase. The introduction of bentonite also lowered the soap concentration in crude biodiesel, which was beneficial for the post-treatment to generate refined biodiesel. © 2015 Elsevier B.V. All rights reserved.

Wang Y.-Z.,Guangxi University | Zhang L.-Y.,Guangxi University | Mo Y.,Guangxi University | Wei G.-T.,Guangxi Academy of science | And 4 more authors.
Materials and Manufacturing Processes | Year: 2015

Preparation of bagasse carbon-red mud (BCRM), a low-cost adsorption material used in wastewater treatment, from red mud and bagasse has been studied. Effects of most important conditions in preparation process on the adsorption capability of BCRM were investigated. The optimal preparation parameters for BCRM were obtained. BCRM had a high surface area and a good mesoporous structure and exhibited an excellent adsorption capacity. The used BCRM could be regenerated via simple calcination at 573 K in air for 1 h. BCRM was an effective, economic, and regenerable material for adsorption of organic contaminants in wastewater. 2015 Copyright © Taylor & Francis Group, LLC

Fu-Chuan H.,Guangxi University | Fu-Chuan H.,Guangxi Key Laboratory of Petrochemical Resource Processing and process intensification Technology | Xing-Zhong T.,Guangxi University | Man-Rong S.,Guangxi University | And 3 more authors.
Advanced Materials Research | Year: 2013

The combination of ship gas turbine working at special environment, this article pass through the study of base oil and composite additive, developed an application marine environment of the ship gas turbine reducer lubricants. According to comprehensive performance assessment, the product has excellent high-temperature anti-oxidant, anti-wear, corrosion inhibition and anti-foam performance. The indicators have reached the requirements. With the development of China's ship gas turbine technology, especially UGT25000 ship gas turbine technology is imported from Ukraine, as well as the recent introduction of the GE LM2500 + G4 Series of technology for power plant of construction. The localization of the supporting facilities are growing louder, there is a strong market rigid demand. Ship gas turbine must be one of the trends of the development of Marine Power. Ship gas turbine due to light weight, small size, stand-alone power, fast start; less pollution, vibration, high thermal efficiency and gas initial temperature, it is easy to realize the cascade of energy use, economy, received widespread attention and application. China's ship gas turbine of modification and design draw the aero-engine, ship gas turbine is a continuous rotation of the impeller mechanical heat engine; it is mainly composed by three parts of the compressor, gas generator and gas turbine. Ships generally use diesel (fuel have heavy trend, the heavy diesel oil or No. 200 heavy oil will be used) as fuel, in order to adapt the ship gas turbine, ship gas turbine need to transform, particularly its' lubrication system [1]. Foreign aviation gas engine lubricants are based on the U.S. standard as a reference, due to the differences of using purpose and fuel, so that the ship gas turbine oil has different requirements. Since ship gas Turbine Technology started late in China, the ship gas turbine core engine technology patents come from the United States, Russia and Ukraine, so the use of gas turbine lubricants, as well as matching accessories and other standards, which are more or less directed reference to refer to the original foreign standards [2,3]. We have never been established using standard ship gas turbine oil. Ship gas turbine apply to the special conditions (high humidity, salt spray, etc.), the ship gas turbine of lubrication has a higher demand, particularly for the ship gas turbine reducer of lubrication. The ship gas turbine reducer work in the low-speed heavy-duty and high-speed heavy-duty, high strength, high shear conditions, how ensure the ship gas turbine reducer to normal work is very important at high load conditions. In this regard, developing of a ship gas turbine reducer lubricant is very necessary. © (2013) Trans Tech Publications, Switzerland.

Sun L.,Guangxi University | Sun L.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | Liao D.,Guangxi University | Liao D.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | And 5 more authors.
Journal of Chemical Thermodynamics | Year: 2012

(Vapor + liquid) equilibrium (VLE) data for binary system of (α-pinene + p-cymene) and ternary system of {α-pinene + p-cymene + (S)-(-)-limonene} were measured at 100.7 kPa using the modified Ellis equilibrium still. The VLE data are thermodynamically consistent. Parameters of the binary system for the four solution models - Liebermann-Fried, Wilson, NRTL, and UNIQUAC - were calculated by referencing least squares method to minimize an objective function based on the total pressure. The ternary system data were predicted with the parameters of Liebermann-Fried model obtained from the pertinent binary systems. The predicted bubble-point temperature and the vapor composition for the ternary system were in good agreement with the experimental results. Smooth representations of the results are used to construct constant excess Gibbs free energy contours on Roozeboom diagrams. © 2012.

Wang Y.,Guangxi University | Zhang L.,Guangxi University | Yan Z.,Guangxi University | Shao L.,Guangxi University | And 3 more authors.
Desalination and Water Treatment | Year: 2015

To understand adsorption property of bagasse carbon-red mud (BCRM), a low-cost adsorption material prepared from waste solid red mud and bagasse, for disposal of organic dyes in wastewater, the adsorption of methylene blue (MB) from aqueous solution on BCRM has been studied, and the adsorption treatment of real textile wastewater was also investigated. Characterization of BCRM was achieved by scanning electron microscope and nitrogen adsorption–desorption analysis. Effects of adsorption time, BCRM dosage, initial concentration, temperature, and initial pH on the adsorption of MB were explored. From the characterization of adsorbent, it can be seen that the prepared BCRM was a porous material composed of particles with rough surface and loose structure, and an excellent mesoporous material with high specific surface area and good mesopore structure. The adsorption results showed that the data fitted better with pseudo-second-order kinetic model (R2 = 0.9995) than pseudo-second-order kinetic and intraparticle diffusion models. Langmuir model was better fit isotherm for MB adsorption on BCRM than Freundlich and Dubinin–Radushkevich adsorption isotherms. It can be drawn that MB adsorption on BCRM was a monolayer adsorption and the adsorption occurred at specific homogeneous sites on the adsorbent. The results of adsorption thermodynamics indicated MB adsorption on BCRM was a spontaneous, endothermic, and physical process. The adsorption treatment of real textile wastewater by BCRM implied BCRM was an effective and regenerable adsorbent for removal of dye from wastewater. © 2015 Balaban Desalination Publications. All rights reserved.

Li Z.,Guangxi University | Jiang W.,Guangxi University | Zhang L.,Guangxi University | Wang Y.,Guangxi University | Wei G.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology
Colloid and Polymer Science | Year: 2015

The adsorption behaviors of methylene blue (MB) by a thermo-sensitive colloid composed of sodium alginate and methylcellulose (TSC-SA/MC) have been investigated. The results showed that the dosage of SA had an important effect on the adsorption capability of TSC-SA/MC. The maximum of adsorption capability appeared at mSA/mMC of 0.3:1, and among all the differences in adsorption capability between 30 and 60 °C, 61 mg·g−1 was the maximum adsorption difference appeared at mSA/mMC of 0.3:1. The adsorption capability of TSC-SA/MC increased with pH from 2 to 11, decreased with temperature from 30 to 70 °C. The adsorption data were not well fitted by Langmuir, Freundlich, Temkin, or Dubinin-Radushkevich model, suggesting the adsorption of MB on TSC-SA/MC did not belong to a single adsorption style. The maximum adsorption capacity of adsorption isotherm data was 1098.5 mg·g−1. The adsorption of MB by TSC-SA/MC fitted the pseudo-second-order model, and the main resistances for MB adsorption by TSC-SA/MC involved the external mass transfer, intraparticle mass transfer, and sorption on active site. The ΔH of MB adsorption by TSC-SA/MC was −48.26 kJ·mol−1, and the ΔS was −143.00 J·K−1·mol−1. The ΔG indicated that the adsorption could change from a spontaneous process to a nonspontaneous process with temperature increase. Both physical and chemical adsorption took place in the MB adsorption process. Fourier transform infrared spectroscopy (FTIR) spectra of filter cakes of TSC-SA/MC before and after adsorption of MB showed that the adsorption process for MB by TSC-SA/MC had a quite complicated mechanism, and the successful adsorption involved many chemical groups. © 2015, Springer-Verlag Berlin Heidelberg.

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