Insights into the Stability of Pd/CN Catalyst in Liquid Phase Hydrogenation of Phenol to Cyclohexanone: Role of Solvent

2019 ◽  
Vol 149 (11) ◽  
pp. 3087-3096 ◽  
Author(s):  
Xiang Zhang ◽  
Yan Du ◽  
Hong Jiang ◽  
Yefei Liu ◽  
Rizhi Chen
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Hydrogenation ◽  
The Stability ◽  
Role Of Solvent

Reaction Pathways and the Role of Solvent in the Hydrogenation of Chloronitrobenzenes

2003 ◽  
Vol 68 (10) ◽  
pp. 1819-1832 ◽  
Author(s):  
Vieroslav Krátky ◽  
Milan Králik ◽  
Alexander Kaszonyi ◽  
Magdaléna Stolcová ◽  
Lubomír Zalibera ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Benzene Ring ◽  
Catalyst Activity ◽  
Reaction Pathways ◽  
Reaction Conditions ◽  
Liquid Phase Hydrogenation ◽  
Role Of Solvent ◽  
Hplc Analyses ◽  
C Nmr

Liquid phase hydrogenation of chloronitrobenzenes to corresponding chloroanilines over Pd on carbon (Pd/C) under mild reaction conditions was studied. On the basis of 1H, 13C NMR, GC-MS and HPLC analyses of reaction mixtures, the reaction pathways were evaluated. The reduction of substrates proceeds via the formation of chloronitrosobenzenes and N-(chlorophenyl)hydroxylamines and mainly results in the formation of the chloroanilines and aniline. Aniline is formed by hydrogenolysis of chlorine (dechlorination) in benzene ring. Other compounds (mono- and disubstituted azobenzenes and azoxybenzenes) were also detected by GS-MS and HPLC (<3 mole %). The used solvent influences the reaction mixture composition and catalyst activity.

scholarly journals Study on Liquid Phase Hydrogenation Technology of White Oil

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Tiezhen Zhang ◽  
◽  
Famin Sun ◽  
Yungang Jia ◽  
Fangming Xie ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Raw Materials ◽  
Copper Plate ◽  
Simulation Software ◽  
Quality Requirements ◽  
Food Grade ◽  
Ultraviolet Absorbance ◽  
Liquid Phase Hydrogenation ◽  
The Stability ◽  
Aromatic Hydrogen

Using Aspen Plus simulation software to simulate the hydrogen solubility of white oil raw materials, and calculate the de-aromatic hydrogen consumption. The liquid hydrogenation technology of white oil was studied by using 100mL uplink liquid hydrogenation evaluation device. The research results show that the ultraviolet absorbance of the liquid phase hydrogenation product is no more than 0.1, and saybolt color, copper plate corrosion, readily carbonizable substance can meet the quality requirements under the conditions of 230℃, 17 Mpa and LHSV 0.5 h-1. 2000 hours liquid phase hydrogenation test shows the stability of product quality which meets the food grade standard, and the liquid phase hydrogenation technology is feasible.

The key role of solvent in condensation: mapping water in liquid-liquid phase-separated FUS

2021 ◽  
Author(s):  
Jonas Ahlers ◽  
Ellen M. Adams ◽  
Verian Bader ◽  
Simone Pezzotti ◽  
Konstanze F. Winklhofer ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Role Of Solvent

Liquid phase hydrogenation of furfural to biofuel over robust NiCu/Laponite catalyst: A study on the role of copper loading

2021 ◽  
Author(s):  
S. Umasankar ◽  
P. Santhana Krishnan ◽  
G. Sonia Theres ◽  
P. Tamizhdurai ◽  
K. Shanthi
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Hydrogenation

Role of solvent in liquid-phase adsorption drying of organic substances

1975 ◽  
Vol 11 (9) ◽  
pp. 679-682
Author(s):  
V. I. Yuzefovich ◽  
I. �. Gel'ms ◽  
N. V. Kel'tsev
Keyword(s):  
Liquid Phase ◽  
Organic Substances ◽  
Liquid Phase Adsorption ◽  
Role Of Solvent

Elucidation of block boundaries as the dissolution channels in hydrated cement

1978 ◽  
Vol 36 (1) ◽  
pp. 484-485
Author(s):  
N.V. Belov ◽  
U.I. Papiashwili ◽  
B.E. Yudovich
Keyword(s):  
Liquid Phase ◽  
Grain Boundaries ◽  
Benzoyl Peroxide ◽  
Phase Contrast ◽  
Active Role ◽  
Point Of View ◽  
Hardened Cement ◽  
Hydrated Cement ◽  
Hardened Cement Paste

It has been almost universally adopted that dissolution of solids proceeds with development of uniform, continuous frontiers of reaction.However this point of view is doubtful / 1 /. E.g. we have proved the active role of the block (grain) boundaries in the main phases of cement, these boundaries being the areas of hydrate phases' nucleation / 2 /. It has brought to the supposition that the dissolution frontier of cement particles in water is discrete. It seems also probable that the dissolution proceeds through the channels, which serve both for the liquid phase movement and for the drainage of the incongruant solution products. These channels can be appeared along the block boundaries.In order to demonsrate it, we have offered the method of phase-contrast impregnation of the hardened cement paste with the solution of methyl metacrylahe and benzoyl peroxide. The viscosity of this solution is equal to that of water.

A Statistical Study of Process Variables to Optimize a High Speed Curtain Coater: Part I

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 20-26 ◽  
Author(s):  
PEEYUSH TRIPATHI ◽  
MARGARET JOYCE ◽  
PAUL D. FLEMING ◽  
MASAHIRO SUGIHARA
Keyword(s):  
Boundary Layer ◽  
Experimental Design ◽  
High Speed ◽  
Statistical Study ◽  
Process Variables ◽  
High Speeds ◽  
The Stability ◽  
Air Removal ◽  
Removal System

Using an experimental design approach, researchers altered process parameters and material prop-erties to stabilize the curtain of a pilot curtain coater at high speeds. Part I of this paper identifies the four significant variables that influence curtain stability. The boundary layer air removal system was critical to the stability of the curtain and base sheet roughness was found to be very important. A shear thinning coating rheology and higher curtain heights improved the curtain stability at high speeds. The sizing of the base sheet affected coverage and cur-tain stability because of its effect on base sheet wettability. The role of surfactant was inconclusive. Part II of this paper will report on further optimization of curtain stability with these four variables using a D-optimal partial-facto-rial design.

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