Hualu Engineering and Technology CO.

Fengcheng, China

Hualu Engineering and Technology CO.

Fengcheng, China
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Xu L.,Tianjin University | Xu L.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | Guo Z.,Tianjin University | Guo Z.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | And 2 more authors.
Electrochimica Acta | Year: 2013

This work is conducted to study ability of anodic oxidation treatment azo dye C.I. Acid Red 73 (AR73) using the electrodes of Y doped Ti/SnO 2-Sb electrodes prepared by thermal decomposition and Ti/SnO 2-Sb electrodes prepared by electrodeposition. It has been shown that doping Y can enhances the electrochemical activity of the electrodes, but the accelerated service life was slightly reduced. Both the lifetime and electrochemical activity of Ti/SnO2-Sb electrodes prepared by electrodeposition in a new Sn-Sb electrodeposition bath outperform the Ti/SnO2-Sb electrodes prepared by thermal decomposition. Moreover, the effect of varying wastewater process indexes (initial pH (4-10), the addition of NaCl (0-9 mM) and initial dye concentration (0.5-2.0 g L -1)) on the performance of anodic oxidation using Ti/SnO 2-Sb electrodes prepared by electrodeposition was investigated followed by the performance indicators analyses including color, chemical oxygen demand (COD), current efficiency and specific energy consumption. Finally, the synergy technology of anodic oxidation coupling nanofiltration was adopted to treat AR73 wastewater in order to overcome the low current efficiency of anodic oxidation. Preliminary results have shown that the synergy technology could cost-effectively treat AR73 wastewater. © 2013 Elsevier Ltd.


Xu L.,Tianjin University | Guo Z.,Tianjin University | Du L.,Hualu Engineering and Technology Co.
Frontiers of Chemical Science and Engineering | Year: 2013

This work was conducted to study the ability of anodic oxidation of azo dye C.I. Acid Red 73 (AR73) using the yttrium-doped Ti/SnO2-Sb electrodes. The effects of Sb doping level, yttrium doping level, thermal decomposition temperature and cycle times of dip-coating thermal decomposition on the properties of the electrodes were investigated. The results showed that the excellent electrochemical activity of Ti/SnO2-Sb-Y electrode can be achieved at a 7:1 molar ratio of Sn:Sb and thermal decomposition temperature of 550°C. Moreover when the cycle times of dip-coating and thermal decomposition were up to 10 times, the performance of the electrode tends to be stable. The Ti/SnO2-Sb electrodes doped with yttrium (0.5 mol-%) showed the most excellent electrochemical activity. In addition, the influences of operating variables, including current density, initial pH, dye concentration and support electrolyte, on the colour removal, chemical oxygen demand (COD) removal and current efficiency were also investigated. Our results confirmed that the current efficiency increased with the concentrations of dye and sodium chloride. Moreover, increasing the current density and the initial pH would reduce the current efficiency. © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg.


Xu L.,Tianjin University | Xu L.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | Du L.-S.,Tianjin University | Du L.-S.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | And 2 more authors.
Journal of Membrane Science | Year: 2012

To investigate the effects of electrolytic oxidation on nanofiltration in treating dye waste water, we put a mesh catalytic electrode on the intercept side of the membrane and apply a voltage to realize the coupling of electrolytic oxidation and nanofiltration. The effects of the electroosmosis, electrophoresis and electrochemical oxidation on the flux were investigated. Experiments show that electroosmosis makes the flux increase linearly with the electric intensity. When there is only an electric filed in the coupling experiments, we get that, with the increase of the electric intensity the flux is accelerating until the electric intensity reach the critical value, after that the flux increase linearly with the electric intensity. With the current density increasing, the degraded organics and the bubbles generated increase, and so the thickness of the concentration polarization and gel layer is reduced in a certain degree. The flux increases with the decrease of the feed concentration in the coupling experiments. The trend that the flux increases with the pressure slows down. The flux increases to a certain value and then keeps constant with the increase of the cross flow velocity. The trend that the flux decreases with time slows down with the increase of the voltage, because of the electroosmosis, electrophoresis and electrochemical oxidation. And when the voltage increases to a certain degree, the flux keeps at a high level and changes less with time because the thickness of concentration polarization and gel layer is reduced to the minimum. © 2012 Elsevier B.V.


Zhang W.H.,Northwest University, China | Zhang W.H.,Hualu Engineering and Technology CO. | Dong Z.,Northwest University, China | Wang Y.Y.,Northwest University, China | And 4 more authors.
Dalton Transactions | Year: 2011

Along with our recent investigation on the flexible ligand of H 2ADA (1,3-adamantanediacetic acid), a series of ZnII and CdII metal-organic frameworks, namely, [Zn3(ADA) 3(H2O)2]n·5nH2O (1), [Zn(ADA)(4,4′-bipy)0.5]n (2), [Zn 2(ADA)2(bpa)]n (3), [Zn2(ADA) 2(bpa)]n (4), [Zn2(ADA)2(bpp)] n (5), [Cd(HADA)2((4,4′-bipy)]n (6), [Cd3(ADA)3(bpa)2(CH3OH)(H 2O)]n (7), and [Cd2(ADA)2(bpp) 2]n·7nH2O (8) have been synthesized and structurally characterized (where 4,4′-bipy = 4,4′-dipyridine, bpa = 1,2-bis(4-pyridyl)ethane and bpp = 1,3-bis(4-pyridyl)propane). Due to various coordination modes and conformations of the flexible dicarboxylate ligand and the different pyridyl-containing coligands, these complexes exhibit structural and dimensional diversity. Complex 1 exhibits a three-dimensional (3D) framework containing one-dimensional (1D) ZnII-O-C-O-ZnII clusters. Complex 2 exhibits a 2D structure constructed by 1D double chains based on [Zn2ADA2] units and a 4,4′-bipy pillar. Complexes 3 and 4 possess isomorphic 2D layer structures, resulting from the different coordination modes of carboxylate group of ADA ligands. Complex 5 features a 2D 44 layer in which ADA ligands and ZnII atoms construct a 1D looped chain and the chains are further connected by bpp ligands. Complex 6 is composed of 1D zig-zag chains that are entangled through hydrogen-bonding interactions to generate a 2D network. Complex 7 is a rare (3,5)-connected network. Complex 8 possesses a 3D microporous framework with lots of water molecules encapsulated in the channels. The structural diversity of the complexes perhaps mainly results from using diverse secondary ligands and different metal centre ions, and means the assistant ligand and metal centre play important roles in the design and synthesis of target metal-organic frameworks. This finding revealed that ADA could be used as an effective bridging ligand to construct MOFs and change coordination modes and conformational geometries in these complexes. The thermogravimetric analyses, X-ray powder diffraction and solid-state luminescent properties of the complexes have also been investigated. © 2011 The Royal Society of Chemistry.


Qu Y.-L.,Hualu Engineering and Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2016

The traditional MP flash system in rectisol was optimized by adding the ammonia cooler and the methanol cycle pump in order to improve the efficiency. The effects of different operating pressure of the MP flash system on the MP flash vapor CO2 content and long-term consumption indicators, namely the duty of the MP flash vapor compressor and the water cooler were investigated. The results show that the duty of the MP flash vapor compressor and the water cooler significantly are reduced by 56.48% and 73.41% respectively when a small stream of low temperature methanol is used as the circulating solvent, compared with the traditional process. At the same time, the corresponding fixed equipment investment is lower due to the reduction of the duty of the compressor and the water cooler. So the energy consumption of the MP flash system can reduce under the condition of low equipment investment without any increase in the overall energy consumption of Rectisol. © 2016, Editorial Office of "CHEMICAL ENGINEERING" (CHINA). All right reserved.


Chen X.,Zhejiang University | Zhao L.,Zhejiang University | Zhang X.,Hua Lu Engineering and Technology Co. | Qian C.,Zhejiang University
Energy Conversion and Management | Year: 2012

As massive amount of solid residue is produced from plasma pyrolysis of coal, reasonable use of such residue is significant in protecting environment and improving economic performance. This work is focusing on the fundamental research of the characteristics of coal-water slurry (CWS) prepared from the solid residue of plasma pyrolysis of coal. The effect of particle size, solid concentration, pH and temperature on the rheological properties of CWS is investigated. Shear-thinning behavior of suspension has been observed depending on component content and operating conditions. Static stability is also investigated by sedimentation test. A more suitable cubic model for expressing the relation between viscosity and temperature is proposed. © 2012 Elsevier Ltd. All rights reserved.


Zhang R.-M.,Hualu Engineering and Technology Co. | Luo C.-P.,Hualu Engineering and Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2016

The by-product methyl acetate was derived from alcoholysis reaction during PTMEG process. The azeotropic system between methanol and methyl acetate was easily formed when separating methyl acetate, so high purified methyl acetate is difficult to be obtained. The characteristics of binary azeotrope formed by methanol and methyl acetate were investigated and a double-effect distillation to separate methanol and methyl acetate was proposed. Aspen Plus software was used to simulate and optimize the separating process. The results show that the operating pressure is 35 kPa(G) for low pressure tower, tower top recovery is 1500 kg/h, theoretical plate number is 23, feeding at 9th plate, the reflux ratio is 6, S6 stream feeds at 5th plate. For high pressure tower, operating pressure is 680 kPa(G), theoretical plate number is 19, feeding at 7th plate, the reflux ratio is 3. Energy-saving rates for bottom reboiler and overhead condenser in double-effect distillation process are 27.18% and 28.35%, respectively. © 2016, Editorial Office of "CHEMICAL ENGINEERING" (CHINA). All right reserved.


Hong Z.,Hualu Engineering and Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

Two different domestic processes, i.e. methanol gas phase hydrochlorination method and methanol liquid phase catalytic method for methyl chloride production were described and compared in term of raw material selection, operating conditions, catalyst life, equipment materials selection and maintenance, etc. The two methods show their advantages and disadvantages and the application in different production areas. The suggestion was proposed for selection criteria of two different processes.


Hu J.-L.,Hualu Engineering and Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

The use of chlorine in industry and its related physical properties were summarized, and several processes of chlorine liquefaction were described. According to the different liquefaction pressure and temperature, chlorine liquefaction can be divided into high-pressure method, medium-pressure method and low-pressure method. The low-pressure method of chlorine liquefaction (i.e. R-22 directly freezing method and ammonia-calcium chloride saltwater indirect freezing method) was emphatically introduced. Comparing R-22 directly freezing process with ammonia-calcium chloride saltwater indirectly freezing method, it concludes that R-22 directly freezing process for chlorine liquefaction is comparatively economic energy-saving. Combined with the practical engineering projects, the detail values of economic energy-saving based on R-22 directly freezing technology were explained.


Yang L.,Hualu Engineering and Technology Co. | Xu N.-X.,Hualu Engineering and Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2016

The prospect of a new type of diesel fuel conditioner polyoxymethylene dimethyl ether (DMMn) was analyzed. The DMMn industrial development was analyzed by market supply and demand analysis, the product performance evaluation, the reliability of supply of raw materials, the production technology and preparation. Different types of raw material costs and price basis price were calculated, and the price of diesel was compared. The results show that the fuel consumption tax is levied, the DMMn has obvious competitive prices, if the full tax, its price is less competitive, the project is difficult to profit. The fuel consumption tax affecting DMMn products is an important determinant of competitiveness. In the current serious problems of the atmospheric environment in China, the adding of DMMn can improve diesel combustion in diesel fuel quality and reduce the pollutants in the exhaust emissions. In addition, it also can relieve the tense and ensure national energy security, which has certain social economic and strategic significance. © 2016, Editorial Office of "CHEMICAL ENGINEERING" (CHINA). All right reserved.

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