scholarly journals Coal liquefaction using a tetralin-glycerol co-solvent system: effect of temperature and reaction time on conversion and product yield

2014 ◽  
Author(s):  
S. N. Ali ◽  
K. Ismail ◽  
M. A. M. Ishak ◽  
A. H. Jawad
Keyword(s):  
Reaction Time ◽  
Product Yield ◽  
Solvent System ◽  
Coal Liquefaction ◽  
Effect Of Temperature ◽  
System Effect

scholarly journals SYNTHESIS OF ALIPHATIC ALCOHOLS ON THE BASE ON ETHYLENE

2020 ◽  
Vol 2 (33(60)) ◽  
pp. 34-36
Author(s):  
J. Abdullaev ◽  
S. Nurmanov ◽  
A. Parmonov ◽  
D. Mirkhamitova
Keyword(s):  
High Pressure ◽  
Reaction Time ◽  
Process Parameters ◽  
Product Yield ◽  
Aliphatic Alcohols ◽  
Effect Of Temperature

Synthesis of 2-methylpropanol-1 from ethylene and ethanol at high pressure was investigated. The process parameters were determined and the effect of temperature and reaction time on the product yield was studied.

scholarly journals Isomerization and Dehydroaromatization of R(+)-Limonene Over the Ti-MCM-41 Catalyst: Effect of Temperature, Reaction Time and Catalyst Content on Product Yield

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 508 ◽  
Author(s):  
Monika Retajczyk ◽  
Agnieszka Wróblewska
Keyword(s):  
Reaction Time ◽  
Practical Importance ◽  
Product Yield ◽  
Effect Of Temperature ◽  
Reaction Products ◽  
Polymeric Compounds ◽  
Significant Yield ◽  
Favorable Reaction ◽  
Catalyst Effect ◽  
Mcm 41

This work describes research on the isomerization of R(+)-limonene over the Ti-MCM-41 catalyst. The studies showed that the Ti-MCM-41 catalyst is an active catalyst in the isomerization of R(+)-limonene. As a result of the isomerization of this compound, it is possible to obtain α-terpinene, γ-terpinene, terpinolene and p-cymene. Terpinolene is the main product of this process, and p-cymene is formed by the alpha-terpinene, gamma-terpinene and terpinolene dehydrogenation. The aforementioned products are of great practical importance. The most favorable reaction conditions leading to the obtaining of limonene isomerization products is the use of the catalyst in an amount of 15 wt% and the temperature of 160 °C. Depending on whether the desired products are the isomers of limonene (γ-terpinene, α-terpinene and terpinolene) or the product of their dehydroaromatization (β-cymene), it is possible to shorten or extend the reaction time. The method for the isomerization of limonene on the Ti-MCM-41 catalyst makes it possible to obtain a significant yield of both the limonene and p-cymene isomers. Longer reaction time is conducive to obtain larger quantities of other reaction products and less desirable products that constitute impurities (oxidized products and polymeric compounds).

Pyrolysis of almond shell biomass: effect of temperature and catalyst on product yield

2021 ◽  
pp. 1-14
Author(s):  
Muhammad Imran Din ◽  
Alizzah Amanat ◽  
Zaib Hussain ◽  
Rida Khalid ◽  
Abdul Rauf
Keyword(s):  
Product Yield ◽  
Effect Of Temperature ◽  
Almond Shell

scholarly journals Continuous-Flow Processes for the Production of Floxacin Intermediates: Efficient C–C Bond Formation through a Rapid and Strong Activation of Carboxylic Acids

2020 ◽  
Vol 02 (03) ◽  
pp. e128-e132
Author(s):  
Shao-Zheng Guo ◽  
Zhi-Qun Yu ◽  
Wei-Ke Su
Keyword(s):  
Reaction Time ◽  
Continuous Flow ◽  
Flow System ◽  
Bond Formation ◽  
Product Yield ◽  
Raw Material ◽  
Material Consumption ◽  
Tank Reactor ◽  
Mild Conditions ◽  
Flow Processes

AbstractThe development of highly efficient C–C bond formation methods for the synthesis of ethyl 2-(2,4-dichloro-5-fluorobenzoyl)-3-(dimethylamino)acrylate 1 in continuous flow processes has been described, which is based on the concept of rapid and efficient activation of carboxylic acid. 2,4-Dichloro-5-fluorobenzoic acid is rapidly converted into highly reactive 2,4-dichloro-5-fluorobenzoyl chloride by treating with inexpensive and less-toxic solid bis(trichloromethyl)carbonate. And then it rapidly reacts with ethyl 3-(dimethylamino)acrylate to afford the desired 1. This process can be performed under mild conditions. Compared with the traditional tank reactor process, less raw material consumption, higher product yield, less reaction time, higher operation safety ensured by more the environmentally friendly procedure, and process continuity are achieved in the continuous-flow system.

scholarly journals UNJUK KERJA REAKTOR PLASMA DIELECTRIC BARRIER DISCHARGE UNTUK PRODUKSI BIODIESEL DARI MINYAK KELAPA SAWIT

Teknik ◽  
2013 ◽  
Vol 34 (2) ◽  
pp. 116
Author(s):  
Ardian Dwi Yudhistira ◽  
Istadi Istadi
Keyword(s):  
Reaction Mechanism ◽  
Reaction Time ◽  
Product Yield ◽  
High Energy ◽  
Electrode Gap ◽  
Dbd Plasma ◽  
Electric Voltage ◽  
Batch System ◽  
Electro Catalysis ◽  
Short Time

Biodiesel is one of alternative renewable energy source to substitute diesel fuel. Various biodiesel productionprocesses through transesterification reaction with a variety of catalysts have been developed by previousresearcher. This process still has the disadvantage of a long reaction time, and high energy need. DielectricBarrier Discharge (DBD) plasma electro-catalysis may become a solution to overcome the drawbacks in theconventional transesterification process. This process only needs a short time reaction and low energy process.The purpose of this study was to assess the performance of DBD plasma rector in making biodiesel such as: theeffect of high voltage electric value, electrodes gap, mole ratio of methanol / oil, and reaction time. TheResearch method was using GC-MS (Gas Cromatography-Mass Spectrofotometry) and FTIR (FourierTransform Infrared Spectrofotometry) and then it will be analysed the change of chemical bond betweenreactant and product. So, the reaction mechanism can be predicted. Biodiesel is produced using methanol andpalm oil as reactants and DBD plasma used as reactor in batch system. Then, reactants contacted by highvoltage electric. From the results of this research can be concluded that the reaction mechanism occurs in theprocess is the reaction mechanism of cracking, the higher of electric voltage and the longer of reaction time leadto increasing of product yield. The more of mole ratio of methanol / oil and widening the gap between theelectrodes lead to decreased product yield. From this research, product yield maksimum is 89,8% in the variableof rasio mol metanol/palm oil 3:1, voltage 10 kV, electrode gap 1,5 cm, and reaction time 30 seconds.

scholarly journals Effect of temperature on bio-oil fractions of palm kernel shell thermal distillation

2018 ◽  
Vol 1 (2) ◽  
pp. 27-31
Author(s):  
Deana Qarizada ◽  
Erfan Mohammadian ◽  
Azil Bahari Alias ◽  
Humapar Azhar Rahimi ◽  
Suriatie Binti Mat Yusuf
Keyword(s):  
Liquid Fraction ◽  
Palm Kernel ◽  
Product Yield ◽  
Effect Of Temperature ◽  
Heating Value ◽  
Palm Kernel Shell ◽  
Oil Fraction ◽  
Bio Oil ◽  
Oil Fractions

Distillation is an essential thermo chemical process; it mainly depends on temperature which affects mostly the product yield and composition. The aim of this research is to investigate the effect of temperature on the characterization of bio-oil liquid fraction derived from palm kernel shell (PKS) bio-oil. The temperatures were 100 °C and 140°C. The higher heating value (HHV) obtained were 28.6MJ/Kg and 31.5MJ/Kg for bio-oil fraction 100°C and 140°C respectively. The GC- MS analysis determined that phenol is the dominant product in bio-oil fractions.

scholarly journals Study on Designing Sulfur Containing Bifunctional Building Block with Improved Refractive Index

2009 ◽  
Vol 6 (2) ◽  
pp. 399-411 ◽  
Author(s):  
G. S. Jha ◽  
P. Chhabra ◽  
G. Suri ◽  
M. Tyagi ◽  
P. Arora ◽  
...  
Keyword(s):  
Refractive Index ◽  
Reaction Mechanism ◽  
Reaction Time ◽  
Acid Number ◽  
Effect Of Temperature ◽  
Control Parameters ◽  
Reaction Parameters ◽  
Factors Affecting ◽  
Temperature Rate ◽  
Sulfur Containing

Sulfur and chlorine containing bifunctional diols with C-S bond has been prepared starting from chloroepoxy alkane and thioalcohol. The studies of FTIR, TLC, HPLC and NMR have been used to understand the reaction mechanism, as well as for optimization of the reaction parameters. The reaction is highly exothermic and the effect of temperature, rate of addition of reagents and reaction time are important factors affecting the formation of diol. Viscosity studies, HPLC, FTIR, NMR and acid number studies have shown that, these parameters could be used as process control parameters for the synthesis of diol. Refractive index of the synthesized diol is found to be higher than that of the reactants used.

scholarly journals Interesterification of Egg-Yolk Phosphatidylcholine with p-Methoxycinnamic Acid Catalyzed by Immobilized Lipase B from Candida Antarctica

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1181
Author(s):  
Magdalena Rychlicka ◽  
Anna Gliszczyńska
Keyword(s):  
Reaction Time ◽  
Design Method ◽  
Immobilized Lipase ◽  
Reaction Medium ◽  
Solvent System ◽  
Novozym 435 ◽  
Molar Ratio ◽  
Binary Solvent ◽  
Methoxycinnamic Acid ◽  
Substrate Molar Ratio

The p-methoxycinnamic acid (p-MCA) is one of the most popular phenylpropanoids, the beneficial impact of which on the human health is well documented in the literature. This compound has shown many valuable activities including anticancer, antidiabetic, and neuro- and hepatoprotective. However, its practical application is limited by its low bioavailability resulting from rapid metabolism in the human body. The latest strategy, aimed at overcoming these limitations, is based on the production of more stability in systemic circulation bioconjugates with phospholipids. Therefore, the aim of this research was to develop the biotechnological method for the synthesis of phospholipid derivatives of p-methoxycinnamic acid, which can play a role of new nutraceuticals. We developed and optimized enzymatic interesterification of phosphatidylcholine (PC) with ethyl p-methoxycinnamate (Ep-MCA). Novozym 435 and a binary solvent system of toluene/chloroform 9:1 (v/v) were found to be the effective biocatalyst and reaction medium for the synthesis of structured p-MCA phospholipids, respectively. The effects of the other reaction parameters, such as substrate molar ratio, enzyme dosage, and reaction time, on the degree of incorporation of p-MCA into PC were evaluated by use of an experimental factorial design method. The results showed that substrate molar ratio and biocatalyst load have significant effects on the synthesis of p-methoxycinnamoylated phospholipids. The optimum conditions were: Reaction time of three days, 30% (w/w) of Novozym 435, and 1/10 substrate molar ratio PC/Ep-MCA. Under these parameters, p-methoxycinnamoylated lysophosphatidylcholine (p-MCA-LPC) and p-methoxycinnamoylated phosphatidylcholine (p-MCA-PC) were obtained in isolated yields of 32% and 3% (w/w), respectively.

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