Month: December 2022

Zhang, Jianghua published the artcileEfficient production of medium-chain structured phospholipids over mesoporous organosulfonic acid-functionalized SBA-15 catalysts, Synthetic Route of 110-42-9, the main research area is phospholipid mesoporous organosulfonic acid silica functionalized catalyst.

It is highly desirable that efficient recoverable heterogeneous catalysts should be developed to replace the costly biocatalysts used in producing structured phospholipids (SPLs) with medium-chain fatty acids (MCFAs). Thus, mesoporous Pr and Ph sulfonic acid-functionalized SBA-15 materials synthesized via surface modification methods were investigated for the soybean lecithin interesterification with Me caprate or caprylate. The physicochem. properties of the synthesized solid acids were deeply studied by small-angle X-ray diffraction, SEM, transmission electron microscopy, Fourier transform IR and pyridine adsorption, etc. to build the possible structure-performance relationships. The results revealed that amounts of organosulfonic acid groups were successfully grafted onto the SBA-15 support, and most of the surface acid sites contained in the as-prepared organic-inorganic hybrid samples were assigned as strong Brönsted acid sites. Notably, the functionalized SBA-15 materials exhibited promising catalytic behaviors in producing MCFA-enriched SPLs under mild conditions (40°C, 6 h) when compared with com. Amberlyst-15 and typical phospholipases or lipases, mostly due to their high surface area, ordered structure and adequate Brönsted acid sites. Besides, the as-prepared materials could be easily recycled five times without obvious deactivation. This work might shed light on alternative catalysts for SPL production instead of the costly enzymes.

Catalysts published new progress about Adsorption. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Synthetic Route of 110-42-9.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Shao, Yuewen published the artcileSelective conversion of levulinic acid to gamma-valerolactone over Ni-based catalysts: Impacts of catalyst formulation on sintering of nickel, SDS of cas: 539-88-8, the main research area is levulinate gamma valerolactone nickel catalyst formulation sintering.

Selective production of γ-valerolactone (GVL) from hydrogenation of levulinic acid (LA) is challenging over non-noble metal catalysts but attractive due to the promising application of GVL as platform chem. In this study, Ni catalysts supported on Mg-Al and Ni-Al layered double hydroxides (LDH) were synthesized for hydrogenation of LA. LDH as the precursor could create developed porous structure and facilitate dispersion of Ni species. These factors together achieved selective conversion of LA to GVL with maximum yield of 99% over the 2.25Ni-0.75Mg-Al catalyst. The Ni-based catalysts are not active for the ring-opening of GVL. Mg and Al together in 2.25Ni-0.75Mg-Al suppressed the sintering of nickel species in ethanol, achieving much superior reusability to Ni-Mg. However, in water, the transformation of MgO in either Ni-Mg or 2.25Ni-0.75Mg-Al to amorphous Mg(OH)2 led to the collapse of pore structure and remarkable deactivation of the catalysts, while Ni-Al without Mg species performed much better.

Chemical Engineering Science published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Palakkal, Leena published the artcileCorrosion inhibition properties of the extracts of Hemigraphis colorata against mild steel in acidic media, Application of Methyl docosanoate, the main research area is mild steel Hemigraphis colorata hydrochloric acid corrosion inhibition.

Corrosion inhibition activity of the methanolic extracts of the leaf and stem of the plant Hemigraphis colorata against mild in 1M HCl were studied by weight loss methods at different temperatures The chem. components present in the extracts were analyzed by GC-MS methods. From the results obtained it was concluded that the extracts possess good inhibition efficiencies. The efficiencies were found to increase with inhibitor concentration and decrease with increase in temperature Evaluation of thermodn. parameters reveals that the adsorption of extracts on the mild steel surface obeys Langmuir adsorption isotherm. The mechanism of adsorption was found to involve a combination of physisorption and chemisorption. Quantum chem. studies on the major components identified in the extract by GC-MS method is in agreement with the exptl. observations.

Research Journal of Chemistry and Environment published new progress about Adsorption. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Application of Methyl docosanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ali, Ismat H. published the artcileAdsorption and corrosion inhibition behaviour of oil extracted from Moringa peregrina leaves for carbon steel in acidic media: experimental and computational studies, Related Products of esters-buliding-blocks, the main research area is Moringa leave carbon steel adsorption corrosion inhibition.

The current research aimed at investigating the potential corrosion inhibitory effect of essential oil extracted from Moringa peregrina leaves on carbon steel in acidic conditions. Gas chromatog. (GC) and scanning electron microscope (SEM) were employed for studying the composition of the inhibitor and surface morphol. changes of CS samples. Different exptl. techniques such as chem., electrochem. and surface characterization techniques were utilized for carbon steel (CS) immersed in 1.0 M HCl solution Exptl. observations suggest that through phys. and chem. interactions, the inhibitor mols. form a stable layer on steel surface. The nature of adsorption of the investigated inhibitor onto the carbon steel surface obeyed the Langmuir isotherm model. Moreover, the electrochem. results revealed that the investigated inhibitor acts as a mixed-type inhibitor. D. function theory (DFT) calculations and mol. dynamic (MD) simulations were utilized to gain an insight into the possible interactions between the carbon steel surface and the inhibitor mol. mainly 9-Octadecadienoic acid (Z) present in the essential oil.

International Journal of Electrochemical Science published new progress about Adsorption. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Related Products of esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Guo, Fenghao published the artcileFunctional monodisperse microspheres fabricated by solvothermal precipitation co-polymerization, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is polymer microsphere solvothermal precipitation copolymerization.

Simultaneous achievement in high solid content and high microsphere yield is deemed a challenge in the fabrication of monodisperse microspheres by precipitation polymerization We herein demonstrate that micro-sized monodisperse poly(methacrylic monomer-divinylbenzene) microspheres containing epoxy, lauyl, carboxyl and hydroxyl functions can be fabricated by solvothermal precipitation co-polymerization at 20% (mass) monomer loading with over 94% microsphere yield. The morphol. and porosity of the obtained particles can be readily tuned by cosolvent-acetonitrile binary solvents. Addition of a small amount of cosolvent that has similar solubility parameter to that of the functional monomer can significantly improve the monodispersity of the obtained microspheres. When THF was used as the co-solvent, the surface area of the highly porous microspheres achieved higher than 400 m2·g1. Solvothermal precipitation co-polymerization can be expected in scale-up fabrication of various monodisperse functional microspheres free of any surfactant and additive.

Chinese Journal of Chemical Engineering published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhong, Hanyi published the artcileMinimizing the HTHP filtration loss of oil-based drilling fluid with swellable polymer microspheres, Application of Dodecyl 2-methylacrylate, the main research area is HTHP filtration oil drilling fluid swellable polymer microsphere.

Filtration control of drilling fluid plays an important role in the process of wellbore construction and ensures the success of drilling operation. A swellable polymer microsphere (SPM) of methylmethacrylate (MMA), Bu acrylate (BA), and lauryl methacrylate (LMA) was synthesized with suspension polymerization Its swelling property was characterized by oil adsorption capacity measurement. First, the effect of SPM on the filtration and rheol. properties of virgin organic clay dispersion was investigated. Then the filtration and rheol. properties of mineral oil-based drilling fluid in the presence of SPM were elucidated under the resp. conditions of hot aging temperature, oil to water ratio and d. Furthermore, the filtration control properties between SPM and two traditional filtration loss additives including modified lignite and asphaltic additive was compared. Addition of SPM exhibited obvious influence on the viscosity of oil-based drilling fluid especially at high concentration of 3 w/v%, therefore, a concentration of lower than 1.5 w/v% was recommended. After hot aging at 200°C, the oil-based drilling fluid containing 1 w/v% SPM exhibited an API filtration loss decrease of 85%, and HTHP filtration loss decrease of 79% in comparison with the base fluid. After hot rolling at 180°C, the API filtration loss decreased by 2%, 24% and 53%, and the HTHP filtration loss decreased by 42%, 54% and 65% resp. when 1 w/v% asphaltic additive, modified lignite and SPM are in the presence of the base fluid. Besides decreasing the filtration loss volume under high temperatures, incorporation of SPM also improves the filter cake quality of oil-based drilling fluid. SPM is capable of adsorbing considerable base oil and become swellable. The swellable polymer microspheres with favorably deformable and compressible properties can effectively fill the voids of filter cake and reduce the permeability, which leads to low filtration loss and minimization of solids invasion.

Journal of Petroleum Science & Engineering published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Application of Dodecyl 2-methylacrylate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Huang, Qing published the artcileNitric acid functionalization of petroleum coke to access inherent sulfur, Quality Control of 111-11-5, the main research area is petcoke nitric sulfuric acid catalyst treatment dibenzothiophene oxidation.

Sulfonated carbon-based catalysts have been identified as promising solid acid catalysts, and petroleum coke (petcoke), a byproduct of the oil industry, is a potential feedstock for these catalysts. In this study, sulfur-containing (6.5 wt%) petcoke was used as a precursor for these catalysts through direct functionalization (i.e., without an activation step) with nitric acid to access the inherent sulfur. Catalysts were also prepared using sulfuric acid and a mixture of nitric and sulfuric acid (1:3 vol ratio). Fourier transform IR spectroscopy, XPS, and titration were used to identify and quantify the acid sites. The activities of the prepared catalysts were determined for the esterification of octanoic acid with methanol. Petcoke had few -SO3H groups, and correspondingly no catalytic activity for the reaction. All acid treatments increased the number of -SO3H groups and promoted esterification. Treatment with nitric acid alone resulted in the oxidation of the inherent sulfur in petcoke to produce ∼0.7 mmol/g of strong acid sites and a total acidity of 5.3 mmol/g. The acidity (strong acid and total) was lower with sulfuric acid treatment but this sample was more active for the esterification reaction (TOF of 31 h-1 compared to 7 h-1 with nitric acid treatment).

Catalysts published new progress about Adsorption. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Quality Control of 111-11-5.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhao, Caimei published the artcileFabrication of hydrophobic NiFe2O4@poly(DVB-LMA) sponge via a Pickering emulsion template method for oil/water separation, COA of Formula: C16H30O2, the main research area is nickel iron oxide polydivinylbenzenecolaurylmethacrylate sponge; sponge Pickering emulsion template method oil water separation.

Super-hydrophobic porous absorbents are convenient, low-cost, efficient and environment-friendly materials in the treatment of oil spills. In this work, a simple Pickering emulsion template method was employed to fabricate an interconnected porous poly(DVB-LMA) sponge. A new co-Pickering stabilization system of Span 80 and NiFe2O4 nanoparticles was used to prepare ultra-concentrated internal phase water-in-oil (W/O) emulsions. After further polymerization, the resulting sponges were generated, which exhibited excellent adsorption selectivity due to the super-hydrophobicity and super-lipophilicity. Furthermore, the characterization results indicated that the composites had superior thermal stability, low d., high porosity and a flexible three-dimensional porous structure. Besides, the addition of nickel ferrite nanoparticles provided the materials with extra magnetic operability. High oil adsorption capacity (up to 36.9-84.2 g g-1), high oil retention, fast adsorption rate and superior reusability allowed the materials to be applied in the treatment of oily water.

Soft Matter published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, COA of Formula: C16H30O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Li, Fuzeng published the artcileFlotation and adsorption mechanism studies of antimony sulfide with 5-heptyl-1,3,4-oxadiazole-2-thione as a collector, Quality Control of 111-11-5, the main research area is antimony sulfide heptyl oxadiazole thione collector flotation adsorption.

Oxadiazole-thione compounds include the conjugated N-, O- and S-donor atoms and possess special metal-chelating properties. In the paper, an alkyl oxadiazole-thione surfactant, 5-heptyl-1,3,4-oxadiazole-2-thione (HpODT) was designed and synthesized as a chelating collector used for the recovery of antimony sulfide. Micro-flotation tests showed that the HpODT has better recovery and selectivity for antimony sulfide against iron and cadmium sulfide in comparison with sodium iso-Bu xanthate (SIBX). The adsorption anal. indicated that the adsorption of HpODT on antimony sulfide was a spontaneous-exothermic chemisorption process. The UV absorption spectrum (UVAS) revealed that HpODT might anchor on antimony sulfide surfaces by adsorption monolayers. The zeta potential and FTIR inferred recommended a chemisorption of antimony sulfide to HpODT. XPS afforded distinct proofs that the conjugated N- and S-donor atoms of HpODT coordinate with the surface antimony atoms of antimony sulfide to generate the hydrophobic HpODT-Sb surface complexes.

Minerals Engineering published new progress about Adsorption. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Quality Control of 111-11-5.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kessler, Amanda published the artcileAdsorption of Horseradish Peroxidase on Metallic Nanoparticles: Effects on Reactive Oxygen Species Detection Using 2′,7′-Dichlorofluorescin Diacetate, Product Details of C24H14Cl2O7, the main research area is adsorption horseradish peroxidase metallic nanoparticle fluorescence indicator; reactive oxygen species dichlorofluorescin diacetate.

The fluorescent probe 2′,7′-dichlorofluorescein diacetate (DCFH-DA) together with the enzyme horseradish peroxidase (HRP) is widely used in nanotoxicol. to study acellular reactive oxygen species (ROS) production from nanoparticles (NPs). This study examined whether HRP adsorbs onto NPs of Mn, Ni, and Cu and if this surface process influences the extent of metal release and hence the ROS production measurements using the DCFH assay in phosphate buffered saline (PBS), saline, or Dulbecco’s modified Eagle’s medium (DMEM). Adsorption of HRP was evident onto all NPs and conditions, except for Mn NPs in PBS. The presence of HRP resulted in an increased release of copper from the Cu NPs in PBS and reduced levels of nickel from the Ni NPs in saline. Both metal ions in solution and the adsorption of HRP onto the NPs can change the activity of HRP and thus influence the ROS results. The effect of HRP on the NP reactivity was shown to be solution chem. dependent. Most notable was the evident affinity/adsorption of phosphate toward the metal NPs, followed by a reduced adsorption of HRP, the concomitant reduction in released manganese from the Mn NPs, and increased levels of released metals from the Cu NPs in PBS. Minor effects were observed for the Ni NPs. The solution pH should be monitored since the release of metals can change the solution pH and the activity of HRP is known to be pH-dependent. It is furthermore essential that solution pH adjustments are made following the addition of NaOH during diacetyl removal of DCFH-DA. Even though not observed for the given exposure conditions of this study, released metal ions could possibly induce agglomeration or partial denaturation of HRP, which in turn could result in steric hindrance for H2O2 to reach the active site of HRP. This study further emphasizes the influence of HRP on the background kinetics, its solution dependence, and effects on measured ROS signals. Different ways of correcting for the background are highlighted, as this can result in different interpretations of generated results. The results show that adsorption of HRP onto the metal NPs influenced the extent of metal release and may, depending on the investigated system, result in either under- or overestimated ROS signals if used together with the DCFH assay. HRP should hence be used with caution when measuring ROS in the presence of reactive metallic NPs.

Chemical Research in Toxicology published new progress about Adsorption. 2044-85-1 belongs to class esters-buliding-blocks, name is 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, and the molecular formula is C24H14Cl2O7, Product Details of C24H14Cl2O7.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics