scholarly journals Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

2019 ◽  
Vol 16 (10) ◽  
pp. 1705 ◽  
Author(s):  
Lei Chen ◽  
Yanhua Xu ◽  
Yongjun Sun
Keyword(s):  
Catalytic Oxidation ◽  
Mass Flow ◽  
Reaction Temperature ◽  
Oxygen Demand ◽  
Phenol Removal ◽  
Coking Wastewater ◽  
Reaction Conditions ◽  
Combined Process ◽  
Optimum Reaction ◽  
Catalyst Dosage

In this study, coagulation, ozone (O3) catalytic oxidation, and their combined process were used to pretreat actual coking wastewater. The effects on the removal of chemical oxygen demand (COD) and phenol in coking wastewater were investigated. Results showed that the optimum reaction conditions were an O3 mass flow rate of 4.1 mg min−1, a reaction temperature of 35 °C, a catalyst dosage ratio of 5:1, and a O3 dosage of 500 mg·L−1. The phenol removal ratio was 36.8% for the coagulation and sedimentation of coking wastewater under optimal conditions of 25 °C of reaction temperature, 7.5 reaction pH, 150 reaction gradient (G) value, and 500 mg·L−1 coagulant dosage. The removal ratios of COD and phenol reached 24.06% and 2.18%, respectively. After the O3-catalyzed oxidation treatment, the phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds were degraded to varying degrees. Coagulation and O3 catalytic oxidation contributed to the removal of phenol and COD. The optimum reaction conditions for the combined process were as follows: O3 dosage of 500 mg·L−1, O3 mass flow of 4.1 mg·min−1, catalyst dosage ratio of 5:1, and reaction temperature of 35 °C. The removal ratios of phenol and COD reached 47.3% and 30.7%, respectively.

scholarly journals Production of biodiesel from vegetable oils and animal fats in waste water

2013 ◽  
Vol 16 (1) ◽  
pp. 5-11
Author(s):  
Thuy Thi Thanh Duong ◽  
Kien Trung Pham ◽  
Phuoc Van Nguyen ◽  
Phuong Thi Thanh Nguyen
Keyword(s):  
Waste Water ◽  
Vegetable Oils ◽  
Reaction Temperature ◽  
Reaction Conditions ◽  
Animal Fats ◽  
Optimum Reaction ◽  
Catalyst Dosage ◽  
G Ratio ◽  
Optimal Reaction ◽  
Optimum Reaction Condition

This study was performed to produce biodiesel from vegetable oils and animal fats in waste water of Park Hyatt Saigon hotel. The survey was performed to determine the optimum reaction condition for converting waste grease into biodiesel. The reaction was conducted at 60, 90 and 120 minutes; the catalyst dosage (NaOH) of 2, 3, 4, 5 and 6 g; ratio of 4:1, 5:1, 6:1, 7:1 MeOH : grease. The reaction temperature was 600C. The optimal reaction conditions were found to be 90 minutes, catalyst dosage of 4 g, ratio of 5:1 MeOH : grease. The efficient conversion achieved 80% biodiesel and 20% crude glycerin.

Study on the Influence of Different Catalysts on the Preparation of Ethyl Levulinate from Biomass Liquefaction

2020 ◽  
Vol 14 (3) ◽  
pp. 396-400
Author(s):  
Shuhua Yang ◽  
Qian Guan ◽  
Zijie Li ◽  
Haiyan Xu ◽  
Zhiwei Wang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Raw Materials ◽  
Raw Material ◽  
Reaction Conditions ◽  
Ethyl Levulinate ◽  
Catalyst Type ◽  
Optimum Reaction ◽  
Catalyst Dosage

The liquefaction experiments of straw biomass under heating and pressure were carried out with sulfuric acid and three ionic liquids as catalysts, 1-Butyl-3-methylimidazolium chloride ([BMIM] [Cl]), 1-Butyl-3-methylimidazolium hydrogen sulfate ([BMIM] [HSO4]), 1-methyl-3-(4-sulfobutyl) imidazole bisulphate ([HSO3-BMIM] [HSO4]), and anhydrous ethanol as solvent. The effects of catalyst type and dosage, reaction time and reaction temperature on liquefaction were investigated and optimized. The results showed that under the catalysis of sulfuric acid, the yield of ethyl levulinate was the highest; [HSO3-BMIM] [HSO4], the conversion of raw materials was the highest; when sulfuric acid was used as catalyst, the optimum reaction conditions were catalyst dosage 10%, reaction temperature 190 °C, reaction time 60 min, the yield of ethyl levulinate (EL) was 18.11%, and the conversion of raw materials was 75%. When [HSO3-BMIM] [HSO4] was used as catalyst, the optimum reaction conditions were as follows: catalyst dosage 26%, reaction temperature 200 °C, reaction time 60 min, the yield of EL was 10.2%, conversion of raw material 85.31%.

Synthesis of a Ruthenium Complex Based on 2,6-Bis[1-(Pyridin-2-yl)-1H-Benzo[d]Imidazol-2-yl]Pyridine and Catalytic Oxidation of (1H-Benzo[d]-Imidazol-2-yl)Methanol to 1H-Benzo[d]Imidazole-2-Carbaldehyde with H2O2

2017 ◽  
Vol 41 (2) ◽  
pp. 88-92
Author(s):  
Shenggui Liu ◽  
Rongkai Pan ◽  
Wenyi Su ◽  
Guobi Li ◽  
Chunlin Ni
Keyword(s):  
Reaction Time ◽  
Catalytic Oxidation ◽  
Reaction Temperature ◽  
Ruthenium Complex ◽  
Reaction Conditions ◽  
Molar Ratios ◽  
Optimal Reaction

2,6-Bis[1-(pyridin-2-yl)-1H-benzo[d]-imidazol-2-yl]pyridine (bpbp), which has been synthesised by intramolecular thermocyclisation of N2,N6-bis[2-(pyridin-2-ylamino)phenyl]pyridine-2,6-dicarboxamide, reacts with sodium pyridine-2,6-dicarboxylate (pydic) and RuCl3 to give [Ru(bpbp)(pydic)] which can catalyse the oxidation of (1H-benzo[d]imidazol-2-yl)methanol to 1H-benzo[d]imidazole-2-carbaldehyde by H2O2. The optimal reaction conditions were: molar ratios of catalyst to substrate to H2O2 set at 1: 1000: 3000; reaction temperature 50 °C; reaction time 5 h. The yield of (1H-benzo[d]imidazol-2-yl) methanol was 70%.

Synthesis of Diamine Containing Chalcone Structure by Nitroammoniation and Aldol Condensation

2019 ◽  
Vol 801 ◽  
pp. 145-150
Author(s):  
Yan Kai Huang ◽  
Qi Lin Mei ◽  
Zhi Xiong Huang ◽  
Yan Qin ◽  
Di Zhu
Keyword(s):  
Reaction Temperature ◽  
Elemental Analysis ◽  
Aldol Condensation ◽  
Raw Material ◽  
Anhydrous Ethanol ◽  
Infrared Analysis ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Ethanol Dosage

In this paper, the structure of the photosensitive diamines was designed and the method of synthesizing such diamines was investigated. The 1-(3-aminophenyl)-3-(4-aminophenyl)-2-propen-1-one analyzed by elemental analysis and infrared analysis was synthesized through two-step experiments with Aldol condensation and Nitroammoniation process. Through the experiment the optimum reaction conditions are raw material ratio of 1:1, anhydrous ethanol dosage of 60 ml, 10 % NaOH dosage of 10 ml and reaction temperature of 25°C for 4h. The yield was about 55.4 %.

Preparation and Properties of MgAl2O4-CaAl12O19 High Temperature Composite

2012 ◽  
Vol 512-515 ◽  
pp. 617-620
Author(s):  
Yong Hong Wang ◽  
Yan Gai Liu ◽  
Tao Yang ◽  
Zhao Hui Huang ◽  
Ming Hao Fang
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Reaction Temperature ◽  
Bending Strength ◽  
Raw Materials ◽  
Weight Ratio ◽  
Raw Material ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Industrial Alumina

The utilization of lightweight refractories plays an important role in reducing the energy consumption of industrial furnaces. In this paper, MgAl2O4-CaA112O19 high temperature composite was synthesized via solid state reaction using magnesite, dolomite and industrial alumina as raw materials. The influences of raw materials and reaction temperature on phase compositions and microstructure of the composite were investigated by XRD and SEM，respectively. The parameters to prepare MgAl2O4-CaA112O19 high temperature composite were optimized. The results show that the optimum reaction conditions for synthesizing MgAl2O4-CaA112O19 composite is the CA6/MA weight ratio of 2:3, and the reaction temperature of 1500°C for 4h. The CaA112O19 crystals showed laminated or plate-like structure, and the MgAl2O4 showed spherical morphology. The reaction temperature had little effect on the phase compositions of MA-CA6 composite in this experiment. The content of Al2O3 in the raw material affected the phase composition of MA-CA6 composite.With the increase of the CaA112O19 amount, the bending strength of the composite decreased.

A New Technological Study on Synthesis of Bis(2-chloroethoxy)Methane

2014 ◽  
Vol 1033-1034 ◽  
pp. 7-11
Author(s):  
Yan Bai ◽  
Xuan Tang ◽  
Kui Zhou ◽  
Cun She Zhang
Keyword(s):  
Mass Fraction ◽  
Acid Catalysis ◽  
Molar Ratio ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Ethylene Chlorohydrin ◽  
Optimum Reaction ◽  
Chromatographic Detection ◽  
Catalyst Dosage ◽  
Technological Study

bis(2-chloroethoxy)methane was synthesized by the reaction of ethylene chlorohydrin and Oligopolyformaldehyde under sulfuric acid catalysis. optimum reaction conditions obtained were as follows: the molar ratio of Oligopolyformaldehyde and ethylene chlorohydrin of 1.2:2, catalyst dosage was 5‰mass fraction of ethylene chlorohydrin, toluene were chose as water-carrying agent, All reactant were refluxed on temperature of 110°C until no water generated. Under the optimum conditions the yield of bis(2-chloroethoxy)methane was 97.7%. The structure of bis(2-chloroethoxy)methane were conformed by ATR IR. The purity of bis(2-chloroethoxy)methane were 99% by gas chromatographic detection.

scholarly journals Photocatalytic degradation of Direct Brown RN dye in the presence of ZnO nanoparticles

2015 ◽  
Vol 50 (1) ◽  
pp. 1-6 ◽  
Author(s):  
ASM A Islam ◽  
T Ferdous ◽  
AK Das ◽  
MM Karim ◽  
SM Masum
Keyword(s):  
Photocatalytic Degradation ◽  
Oxygen Demand ◽  
Major Constituent ◽  
Zno Nanoparticle ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Treated Effluent ◽  
Optimum Reaction ◽  
Ft Ir

The ZnO nanoparticle was prepared by using Zn(NO3)2.6H2O and NaOH under optimum reaction conditions and the prepared nanoparticle was characterized by UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersion X-ray spectroscopy (EDX) and scanning electron microscopy (SEM). The sunlight irradiated photocatalytic degradation of Direct Brown RN dye was studied using ZnO nanoparticle. The results of this investigation revealed that in the presence of sunlight, catalyst load of 0.5 g?L-1 and time of contact of 40 min, ZnO nanoparticle showed substantial capability of destroying Direct Brown RN dye from solution. An actual leather effluent containing Brown RN as a major constituent along with other dyes and dyeing auxiliaries was treated using ZnO and the reduction in the chemical oxygen demand (COD) of the treated effluent revealed almost complete destruction of the organic molecules along with color removal.Bangladesh J. Sci. Ind. Res. 50(1), 1-6, 2015

Analysis on Factors Affecting Biodiesel Production Rate Based on Probability Theory

2013 ◽  
Vol 860-863 ◽  
pp. 1030-1034
Author(s):  
Yi Wei ◽  
Jing Zhang ◽  
Mu Zhang ◽  
Yin Dong Zhang
Keyword(s):  
Experimental Data ◽  
Probability Theory ◽  
Production Rate ◽  
Reaction Temperature ◽  
Correlation Coefficients ◽  
Biodiesel Production ◽  
Reaction Conditions ◽  
Factors Affecting ◽  
Orthogonal Experiments ◽  
Optimum Reaction

Biodiesel orthogonal experiments require large amount of experimental data collected and in order to save experimental time, referring to the correlation coefficients analysis in probability theory, the factors which affect the yield of biodiesel are analyzed. Under the same reaction temperature, the range order is as follows: the molar ration of alcohol to oil, the dosage of catalyst and reaction of time. At the same time, it provides theoretical guidance for obtaining optimum reaction conditions .

scholarly journals Preparation of Mn/Mg/Ce Ternary Ozone Catalyst and Its Mechanism for the Degradation of Printing and Dyeing Wastewater

2022 ◽  
Vol 9 ◽  
Author(s):  
Shuai Zhang ◽  
Huixue Ren ◽  
Kaifang Fu ◽  
Wenqing Cheng ◽  
Daoji Wu ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Catalytic Oxidation ◽  
Removal Rate ◽  
Dynamic Test ◽  
Oxygen Demand ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Treatment Conditions ◽  
Nano Alumina ◽  
Catalyst Dosage

The printing and dyeing wastewater produced by different dyes, as well as different printing and dyeing processes, have different components. These wastewater have high toxicity, high organic concentration, and deep chromaticity. Ozone catalytic oxidation is a very promising technical method for wastewater treatment. In this paper, Mn/Mg/Ce ternary catalyst was prepared, and the ozone catalytic oxidation treatment of actual and simulated printing and dyeing wastewater was performed to study the performance of four different carrier catalysts, namely, molecular sieve (MS), silica gel (SG), attapulgite (ATP), and nano alumina (Al2O3), by simulated dynamic test. The effects of reaction time, pH, and catalyst dosage on methyl orange degradation were studied. The results showed that under the optimum treatment conditions (120 min, pH 11, and 12.5 g/L catalyst dosage), the degradation rate of methyl orange reached 96% and the removal rate of the chemical oxygen demand of printing and dyeing wastewater reached 48.7%. This study shows that the treatment effect of ozone catalytic oxidation on printing and dyeing wastewater is remarkably improved after catalyst addition. This study provides a new choice of ozone catalyst for the degradation of printing and dyeing wastewaters in the future.

Research of Catalytic Oxidation Synthesis of Cyclopentene to Glutaraldehyde

2011 ◽  
Vol 391-392 ◽  
pp. 1149-1152
Author(s):  
Qi Dong Yan ◽  
Jun Xu ◽  
Feng Xu
Keyword(s):  
Reaction Time ◽  
Catalytic Oxidation ◽  
Reaction Temperature ◽  
Influence Factors ◽  
Synthesis Process ◽  
Mass Ratio ◽  
Tertiary Butanol ◽  
Catalyst Dosage ◽  
Main Influence ◽  
Oxidation Synthesis

The paper has studied the process of using H2O2 as oxidant and tungsten acid as catalyst, catalytic oxidation synthesis process of cyclopentene to glutaraldehyde and explored the main influence factors of the reaction, including the reaction time, reaction temperature, catalyst dosage and solvent. Furthermore, the quantitative analysis and qualitative analysis of the product was characterized by gas chromatography. The optimum synthetic condition was as follows: tertiary butanol as solvent, tungsten acid: boron anhydride(mass ratio)=1:1, 30%H2O2 as oxidant, the reaction temperature 35°C, the reaction time 4h, the yield of glutaraldehyde yield was 46%.

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