Synthesis of Di(Chloroethyl) Phosphite

2013 ◽  
Vol 734-737 ◽  
pp. 2532-2535
Author(s):  
Hong Ying Chu ◽  
Zhi Ran Chen
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Phosphorus Trichloride ◽  
Temperature Reaction ◽  
Optimal Conditions ◽  
Orthogonal Method ◽  
Ft Ir

Organic intermediate di (chloroethyl) phosphite was synthesized in this work. The influence of reaction temperature, reaction time and solvent on the yield of product was investigated with orthogonal method. The experiment results show that the optimal conditions were molar ration of 2-chloroethannol / phosphorus trichloride 4.0:1, reaction temperature 65~75 °C, reaction time 4h, solvent 60 mL, and the yield of the product reached 89.5%. The asprepared di (chloroethyl) phosphite samples were further characterized by FT-IR and NMR.

Conversion of Glucose to Levulinic Acid Catalyzed by ZSM-5 Loading SO42-/ ZrO2

2013 ◽  
Vol 291-294 ◽  
pp. 249-252
Author(s):  
Ying Liu ◽  
Lu Lin ◽  
Xiao Yu Sui ◽  
Jun Ping Zhuang ◽  
Chun Sheng Pang
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Levulinic Acid ◽  
Temperature Reaction ◽  
Catalyst Amount ◽  
Hydroxymethyl Furfural ◽  
Ft Ir ◽  
Acid Catalyzed ◽  
Molar Percent ◽  
Hydrolysis Of

Hydrolysis of glucose to produce levulinic acid catalyzed by ZSM-5 loading SO42-/ ZrO2 was studied in this paper. The effects of different factors such as catalyst amount, reaction temperature, reaction time on the yields of levulinic acid and hydroxymethyl furfural were investigated. It was found that the highest yield of levulinic acid was 55.03% (molar percent) under the conditions of catalyst amount 3 g, reaction temperature 180 °C and reaction time 2.5 h. Surface structure of catalyst was analyzed by FT-IR, indicating that crystallinity of catalyst was 0.66.

Removal of Thiophene from Simulated Oil by Catalytic Oxidation Using K2FeO4/ V2O5

2011 ◽  
Vol 183-185 ◽  
pp. 1568-1572
Author(s):  
Yan Xiu Liu ◽  
Hua Song
Keyword(s):  
Reaction Time ◽  
Catalytic Oxidation ◽  
Sulfur Content ◽  
Reaction Temperature ◽  
Temperature Reaction ◽  
Optimal Conditions ◽  
Catalyst Amount ◽  
Deep Desulfurization

Oxidation extraction of thiophene from simulated oil by using K2FeO4as oxidant and methanol as extractant has been investigated. The effects of different catalyst, oxidant amount, catalyst amount, reaction temperature, reaction time, and extraction conditions were studied. This process is capable of decreasing the sulfur content of simulated oil from 100 mg•L-1to 17.8 mg•L-1at the optimal conditions. The results indicate that such a process could be an alternative to common hydrodesulfurization for deep desulfurization.

The Preparation of Micro-Molecular Dextran in Sub-Critical Water/CO2

2013 ◽  
Vol 712-715 ◽  
pp. 502-505
Author(s):  
Shu Qiong Liao ◽  
Xiao Yu Peng ◽  
Xue Wang Zhang ◽  
Ke Lin Huang ◽  
Ben Wang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Temperature Reaction ◽  
Liquid Ratio ◽  
Reaction Conditions ◽  
Reaction Pressure ◽  
Optimum Reaction ◽  
Ft Ir ◽  
Solid Liquid ◽  
Hydrolysis Of

Micro-molecular dextran was prepared in sub-critical water/CO2 by hydrolysis of dextran20. The obtained products were mainly characterized by FT-IR and GPC. Furthermore, the reaction temperature, reaction time, reaction pressure, solid-liquid radio and stirring speed were systematically investigated during the work. The optimum reaction conditions are as follows: the reaction temperature was 160°C; the reaction time was 60 min; the reaction pressure was 2.5MPa; the solid-liquid ratio was 0.6 and the stirring speed was 300r/min.

The Synthesis of Cephalosporin Intermediates THZ

2013 ◽  
Vol 709 ◽  
pp. 801-804
Author(s):  
Cheng Xue Wang ◽  
Xu Feng Liu ◽  
Zhen Ma
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Elemental Analysis ◽  
Ring Opening ◽  
Penicillin G ◽  
Temperature Reaction ◽  
Ring Opening Reaction ◽  
Ft Ir

Starting from Penicillin G,the THZ was synthesized through three main steps:esterification,oxidation and ring-opening. The effects of various reaction temperature,reaction time and ratio of reactants on the ring-opening reaction were investigated.The yields of its three step reaction are 91%,95.8% and 77.3%,respectively.The products were characterized by FT-IR,HNMR,Elemental analysis and MS. At 90~95°C and 0.04~0.05Mpa, the yield of THZ was 77.3%.

Research of Preparation Factors on Magnetic Cassava Starch Microspheres

2013 ◽  
Vol 634-638 ◽  
pp. 1513-1517
Author(s):  
Ping Lan ◽  
Yu Xian Feng ◽  
A Ming Chen ◽  
Lei Lei Qiao ◽  
Li Hong Lan ◽  
...  
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Influence Factors ◽  
Cassava Starch ◽  
Raw Material ◽  
Speed Ratio ◽  
Optimal Conditions

Magnetic cassava starch microspheres have been prepared by means of the method of precipitation magnetization, cassava starch as raw material adsorbing or embedding Fe3O4, many influence factors on magnetic cassava starch iron rate such as pH, reaction time, stirring speed, ratio of Fe+3 to Fe+2, reaction temperature also investigated in this paper. On the base above research, we preliminary got the optimal conditions on the synthesis of magnetic cassava starch microspheres.

Study on Synthesis of the High Aspect Ratios Nesquehonite Whiskers

2011 ◽  
Vol 239-242 ◽  
pp. 1118-1122 ◽  
Author(s):  
Ping Ke Yan ◽  
Bin Wang ◽  
Yu Juan Gao
Keyword(s):  
Aqueous Solution ◽  
Reaction Time ◽  
Low Temperature ◽  
Growth Mechanism ◽  
Reaction Temperature ◽  
Solution Method ◽  
Temperature Reaction ◽  
Aspect Ratios ◽  
Whisker Length ◽  
Aqueous Solution Method

In this paper, nesquehonite whiskers were synthesized by low-temperature aqueous solution method, and the impacts of reaction temperature, reaction time and surfactant dosage and other factors on the maximum whisker length and high aspect ratios of nesquehonite whiskers were also investigated. Results showed that under the conditions that the reaction temperature was 40 – 50 °C the reaction time was 50 – 60min and the amount of surfactant dosage was 1% (by mass), high aspect ratios nesquehonite whisker products can be synthesized. On this basis, growth mechanism of the nesquehonite whiskers was discussed.

Study on Synthesis of Nitrophenyl Isocyanates Using Triphosgene

2012 ◽  
Vol 550-553 ◽  
pp. 1039-1042 ◽  
Author(s):  
Gui Rong Cao ◽  
Xue Yan Zhao ◽  
Rui Jie Xiao
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Molar Ratio ◽  
Optimal Conditions ◽  
Optimum Reaction

In this paper, triphosgene respectively reacting with o-nitrophenyl aniline, m-nitrophenyl aniline and p-nitrophenyl aniline to synthesize corresponding isocyanates. The effects of reactants molar ratio, reaction time and reaction temperature on the yield were investigated. As a result, using 1,2-dichloroethane as reaction solvent, the optimum molar ratio of the three kinds of nitroaniline and triphosgene were all 2.5:1, the optimum reaction time of synthesis of o-nitrophenyl isocyanate, m-nitrophenyl isocyanate and p-nitrophenyl isocyanate respectively was 6h, 5.5h and 5h; the optimum reaction temperature of synthesis of the three kinds of nitrophenyl isocyanates were all 75°C. Under the optimal conditions, the yield of o-nitrophenyl isocyanate, m-nitrophenyl isocyanate and p-nitrophenyl isocyanate could respectively be 80.3%, 83.7% and 83.5%. The products were characterized by meltingtest, ebulliometry, IR, and HPLC

Synthesis of Diethyl Carbonate from Ethyl Carbamate and Ethanol with Acid as Catalyst

2013 ◽  
Vol 821-822 ◽  
pp. 1081-1084 ◽  
Author(s):  
Xian Ye Qin ◽  
Biao Liu ◽  
Bing Han ◽  
Wen Bo Zhao ◽  
Shui Sheng Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Ethyl Carbamate ◽  
Diethyl Carbonate ◽  
Bronsted Acid ◽  
Optimal Conditions ◽  
Reaction Conditions ◽  
Brönsted Acid ◽  
Pyrophosphoric Acid

The catalytic activity of many Lewis and Bronsted acid for the synthesis of diethyl carbonate (DEC) from ethyl carbamate (EC) and ethanol was evaluated in a bath reactor. Pyrophosphoric acid (H4P7O2) which showed the best activity was selected to further investigate the effect of reaction conditions, such as reaction temperature, catalyst dose and reaction time, on the yield of DEC. Under the optimal conditions, DEC yield can reach 29.1%.

scholarly journals Research on the Preparation and Performance of Binary Modified Maltodextrin Water-Reducing Agent

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Jingzhi Wu ◽  
Min Qiao ◽  
Zhifeng Lyu ◽  
Qianping Ran
Keyword(s):  
Reaction Time ◽  
Raw Materials ◽  
Reducing Agent ◽  
Optimal Conditions ◽  
Catalyst Amount ◽  
Dextrose Equivalent ◽  
Ft Ir ◽  
Dispersion Capacity ◽  
Anchoring Groups ◽  
And Performance

Using maltodextrin (MD) of different dextrose equivalent (DE) values, 1,3-propanesultone, and maleic anhydride as raw materials, a novel binary modified maltodextrin (BMMD) was synthesized and further applied as a water-reducing agent. Its structure was characterized by Fourier transform infrared (FT-IR) and UV. The rheological behavior of the sample solution and strengths for concrete were also determined and the adsorption was tested by TOC. The influence of the process parameters to degree of substitution (DS) and the dosage on the fluidity of cement paste were investigated. The results show that the optimal conditions of sulfonation were the MD of DE 15, m (sulfonated agent)/m (MD) of 1.4, the catalyst amount of 1% by mass MD, and the reaction time of 12 h; the optimal conditions of esterification were m (esterified agent)/m (SMD) of 0.6, the reaction temperature of 90°C, and the reaction time of 4 h. The optimal dosages of sulfonated maltodextrin (SMD) and BMMD were 0.475% and 0.45%, respectively. In this dosage, the main dispersion capacity of BMMD attributes to two kinds of anchoring groups (SO3-  &  COO-) and the appropriate molecular weight of MD.

Preparating Arsenic Trioxide with Sulfuric Acid Wet Oxidation

2013 ◽  
Vol 662 ◽  
pp. 437-440
Author(s):  
Lin Zhuan Ma ◽  
Jun Ming Guo ◽  
Qiong Fang Cui ◽  
Man Hong Liu ◽  
Ying Jie Zhang
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Reaction Time ◽  
Arsenic Trioxide ◽  
Reaction Temperature ◽  
Extraction Yield ◽  
Wet Oxidation ◽  
Optimal Conditions ◽  
Concentrated Sulfuric Acid

The technology of the acidification is adopted to prepare arsenic trioxide (As2O3). With a concentration of 98% of concentrated sulfuric acid and Orpiment made into a certain ratio of the slurry suspension. Arsenic trioxide’s content is 99.94%, extraction yield can reach to 98.92%. The optimal conditions is reaction temperature at 120°Cand the reaction time in 2.5 h; the slurry ratio is less than 1/6 and particle size is less than 0.080 mm.

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