ChemInform Abstract: Epoxidation in a Heterogeneous Solid-Liquid Medium: The Influence of Interactions at the Interface on the Stability of Dimethylsulfonium Ylides. Consequences for the Stereochemistry of the Epoxidation Reaction.

ChemInform ◽  
1987 ◽  
Vol 18 (44) ◽  
Author(s):  
E. BORREDON ◽  
M. DELMAS ◽  
A. GASET
Keyword(s):  
Liquid Medium ◽  
Epoxidation Reaction ◽  
The Stability ◽  
Solid Liquid ◽  
Heterogeneous Solid

ChemInform Abstract: Use of a Heterogeneous Solid-Liquid Medium in the Fine Chemistry of Lipids

ChemInform ◽  
2010 ◽  
Vol 23 (3) ◽  
pp. no-no
Author(s):  
E. BORREDON ◽  
Z. MOULOUNGUI ◽  
Y. LE BIGOT ◽  
M. DELMAS ◽  
A. GASET
Keyword(s):  
Liquid Medium ◽  
Fine Chemistry ◽  
Solid Liquid ◽  
Heterogeneous Solid

Influencing Factors of Chromium Ion Stability in Microbe Culture Media

2012 ◽  
Vol 610-613 ◽  
pp. 215-219
Author(s):  
Yun Xiao He ◽  
Xiao Ming Chen
Keyword(s):  
Ionic Liquid ◽  
Liquid Medium ◽  
Culture Media ◽  
Fluid Medium ◽  
Chromium Ion ◽  
Medium Components ◽  
Salt Ions ◽  
Ion Stability ◽  
The Stability ◽  
Ionic Liquid Medium

The stability factors for Cr6+ and Cr3+ in microbiological media, including temperature, preservation conditions and medium components were studied in this research project, through potassium permanganate oxidation and DPC (Diphenylcarbazide) spectrophotometry. It shows that the protein component mainly influences Cr6+ content changes at pre- and post- heat sterilization to the chromium ionic liquid medium, other than being impacted basically by inorganic salt ions. It also indicates that the method can be introduced into experiment researches for microbe dechromisation i.e. Chromium ion aqueous solution and fluid medium are sterilized separately, and then are made into the chrome ions liquid as per a certain concentration. The concentration of hexavalent chromium ions is affected by preservation time and temperature also. For this reason, chromium ionic liquid medium is kept at low temperature, and as quickly as possible for the test.

Study of Continuos Settling Vessels Operating with Suspensions Previously Floculated

2008 ◽  
Vol 591-593 ◽  
pp. 358-361
Author(s):  
J.F. Nunes ◽  
J.R. Lira ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Wastewater Treatment ◽  
Solid Particle ◽  
Aluminum Sulfate ◽  
Cylindrical Part ◽  
Continuous Operation ◽  
Circular Section ◽  
Operational Conditions ◽  
The Stability ◽  
Solid Liquid ◽  
Solid Liquid Separation

The settling vessels are equipment destined to solid-liquid separation; usually have continuous operation, with a circular section, presenting one conic and one cylindrical part. They are very used in chemical industries: wastewater treatment, minerals industries; to concentrate or to remove the solids. The solid particle splitting with small granular becomes difficult through the operation of conventional sedimentation. An expedient very used in the industry is the flocculant substance addition, whose objective is to promote the precipitation of particles, with decantation speed is upper than the single one. The present work aim the study of the burst operational conditions that influence the formation and the stability of these aggregates, the flake, the effect of pH and the concentration of flocculant using kaolin suspension and genfloc, that contains aluminum sulfate, as a flocculant; and the capacity of conventional settling vessel, which area of the transversal remains constant, considering this operational conditions.

A simple and effective strategy to enhance the stability and solid–liquid interfacial interaction of an emulsion by the interfacial dilational rheological properties

Soft Matter ◽  
2020 ◽  
Vol 16 (24) ◽  
pp. 5650-5658
Author(s):  
Jinmei Lei ◽  
Yuxia Gao ◽  
Xu Hou ◽  
Zhizhi Sheng ◽  
Chenhui Zhang ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Emulsion Stability ◽  
Interfacial Interaction ◽  
Effective Strategy ◽  
The Stability ◽  
Solid Liquid

Schematic showing the influence of dilational rheological properties on the emulsion stability and solid–liquid interfacial interaction.

scholarly journals Improved Understanding of the Sulfidization Mechanism in Amine Flotation of Smithsonite: An XPS, AFM and UV–Vis DRS Study

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 370 ◽  
Author(s):  
Ruizeng Liu ◽  
Bin Pei ◽  
Zhicheng Liu ◽  
Yunwei Wang ◽  
Jialei Li ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
High Reactivity ◽  
Phase Imaging ◽  
Solid Product ◽  
Force Microscopy ◽  
Atomic Force ◽  
Liquid Reaction ◽  
Solid Liquid ◽  
Heterogeneous Solid

Sulfidization is required in the amine flotation of smithsonite; however, the sulfidization mechanism of smithsonite is still not fully understood. In this work, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS) were used to characterize sulfidized and unsulfidized smithsonite. The XPS and UV–vis DRS analyses showed that smithsonite sulfidization is a transformation of ZnCO3 to ZnS on the smithsonite surfaces. However, this transformation is localized, resulting in the coexistence of ZnCO3 and ZnS or in the formation of ZnS island structures on the sulfidized smithsonite surfaces. AFM height imaging showed that sulfidization can substantially change the surface morphology of smithsonite; in addition, AFM phase imaging demonstrated that sulfidization occurs locally on the smithsonite surfaces. Based on our findings, it can be concluded that smithsonite sulfidization is clearly a heterogeneous solid–liquid reaction in which the solid product attaches at the surfaces of unreacted smithsonite. Smithsonite sulfidization involves heterogeneous nucleation and growth of ZnS nuclei. Moreover, the ZnS might nucleate and grow preferentially in the regions with high reactivity, which might account for the formation of ZnS island structures. In addition, sphalerite-structured ZnS is more likely to be the sulfidization product of smithsonite under flotation-relevantconditions, as also demonstrated by the results of our UV–vis DRS analyses. The results of this study can provide deeper insights into the sulfidization mechanism of smithsonite.

Low-temperature synthesis and sintering of γ-Y2Si2O7

2006 ◽  
Vol 21 (6) ◽  
pp. 1443-1450 ◽  
Author(s):  
Ziqi Sun ◽  
Yanchun Zhou ◽  
Meishuan Li
Keyword(s):  
Single Phase ◽  
Synthesis Temperature ◽  
Densification Rate ◽  
Calcination Time ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Liquid Reaction ◽  
The Stability ◽  
Yttrium Disilicate ◽  
Solid Liquid

In this article, a novel pressureless solid-liquid reaction method is presented for preparation of yttrium disilicate (γ-Y2Si2O7). Single-phase γ-Y2Si2O7 powder was synthesized by calcination of SiO2 and Y2O3 powders with the addition of LiYO2 at 1400 °C for 4 h. The addition of LiYO2 significantly decreased the synthesis temperature, shortened the calcination time, and enhanced the stability of γ-Y2Si2O7. The sintering of these powders in air and O2 was studied by means of thermal mechanical analyzer. It is shown that the γ-Y2Si2O7 sintered in oxygen had a faster densification rate and a higher density than that sintered in air. Furthermore, single-phase γ-Y2Si2O7 with a density of 4.0 g/cm3 (99% of the theoretical density) was obtained by pressureless sintering at 1400 °C for 2 h in oxygen. Microstructures of the sintered samples are studied by scanning electron microscope.

scholarly journals Study on the stability of a shear-thinning suspension used in oil well drilling

2018 ◽  
Vol 73 ◽  
pp. 10 ◽  
Author(s):  
Flávia M. Fagundes ◽  
Nara B.C. Santos ◽  
João Jorge R. Damasceno ◽  
Fábio O. Arouca
Keyword(s):  
Gamma Ray ◽  
Drilling Fluid ◽  
Shear Thinning ◽  
Drilling Fluids ◽  
Oil Well ◽  
Drilling Process ◽  
Well Drilling ◽  
Constant Rate ◽  
The Stability ◽  
Solid Liquid

In order to avoid solid-liquid gravitational separation of particles in the drilling fluid and cuttings generated in this process, the oil industry has been developing drilling fluids with shear-thinning and thixotropic characteristics. In case of operational stops in the drilling process, the intense sedimentation of these particles can damage the equipment used and the well. In this context, this study simulated an operational stop to obtain information about stability of solids in a paraffin-based suspension with time-dependent shear-thinning behavior, which has already been used in current drilling processes. A long-term test using gamma-ray attenuation technique identified the separation dynamics of a set of micrometric particles belonging to and incorporated into the drilling fluid during operation. This test verified the typical regions of gravitational sedimentation and, through constant concentration curves, indicated that the sedimentation process did not occur at a constant rate. This study also proposed a constitutive equation for pressure on solids.

Sign in / Sign up

Export Citation Format

Share Document