Esters-buliding-blocks

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

Chen, Han published the artcileCatalytic Transfer Hydrogenation of Ethyl Levulinate to γ-Valerolactone Over Ni Supported on Equilibrium Fluid-Catalytic-Cracking Catalysts, Related Products of esters-buliding-blocks, the main research area is catalytic transfer hydrogenation ethyl levulinate gamma valerolactone.

Nickel supported on equilibrium fluid-catalytic-cracking catalysts (Ni/E-cats) were prepared by a simple grinding-pyrolysis method and employed for the transfer hydrogenation of Et levulinate (EL) to γ-valerolactone (GVL). 96.2% selectivity of GVL and 90.3% conversion of EL were obtained at 180°C for 6 h over 30-Ni/E-cat. Through XRD, N2 adsorption-desorption, NH3-TPD and SEM anal., the high activity of the 30-Ni/E-cat catalyst was attributed to its dispersed Ni metal active centers and available acidic sites. Catalytic probe test revealed that metal and acid sites of Ni/E-cat played a synergistic catalytic role in the synthesis of GVL in 2-propanol, where Ni metal sites contribute to the hydrogenation of ketone group in EL, and acid sites of E-cat promoted the lactonization of intermediate ethyl- or iso-Pr 4-hydroxyvalerate. Two reaction pathways and synergistic mechanism were proposed in this catalytic system. Moreover, Ni/E-cat catalyst exhibited good stability up to four cycles without obvious loss of catalytic activity.

Catalysis Letters 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, Related Products of esters-buliding-blocks.

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

Karnjanakom, Surachai published the artcileStudy of a recycling reaction system for catalytic transformation of biomass-based carbohydrates via acidic-polar biphasic conditions, Name: Ethyl 4-oxopentanoate, the main research area is catalytic transformation carbohydrate biomass acidic polar biphasic condition.

Et levulinate (EL) was produced via one-pot conversion of biomass-based carbohydrates under a reusable biphasic system over a solid acid catalyst. In situ EL synthesis and extraction occurred during the reaction, resulting from the addition of a small amount of inorganic NaCl salt. The possible behavior of EL formation was described in detail. No serious reduction in the turnover rate of sucrose conversion was found during the recycling process.

Reaction Chemistry & Engineering 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, Name: Ethyl 4-oxopentanoate.

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

Lai, Fengjiao published the artcileEfficient one-pot synthesis of ethyl levulinate from carbohydrates catalyzed by Wells-Dawson heteropolyacid supported on Ce-Si pillared montmorillonite, Category: esters-buliding-blocks, the main research area is carbohydrate ethyl levulinate heteropolyacid cerium silicon montmorillonite.

Efficient conversion of biomass-derived carbohydrates to alkyl levulinates is an important goal of biorefinery process, but is still challenging on applicable catalyst. Ce-Si pillared montmorillonite (CeSiM) clay heterostructures, incorporated with Wells-Dawson tungstophosphoric acid (H6P2W18O64, DPW), were prepared for the first time and used as the multifunctional catalyst for direct production of Et levulinate (EL) from various biomass-derived sugars. The DPW introduced by sol-gel method (DPW-CeSiM) has been effectively incorporated into the framework of porous CeSiM, while part of DPW was just absorbed on the surface of CeSiM by impregnation method (DPW-CeSiM-I). The DPW-CeSiM catalyst has large sp. surface area owing to the insertion of Ce-Si pillars, and possesses strong Bronsted acidity and moderate Lewis acidity originated from the incorporated DPW and the Ce-doping, resp. Due to the well synergistic effect of porous structure and dual acid, the DPW-CeSiM catalyst efficiently catalyzed the conversion of glucose into EL with 56.2% yield and nearly 100% conversion at 170°C for 4 h. The recyclability studies certified that DPW-CeSiM catalyst showed higher stability than DPW-CeSiM-I over cycles and could be easily recovered from consecutive alcoholysis of biomass-derived sugars. The DPW-CeSiM catalyst also displayed high activity toward the conversion of other biomass-derived carbohydrates (fructose, sucrose, cellobiose and cellulose) into EL. Therefore, this work provides an instructive strategy for the design of efficient and stable DPW-based catalysts with dual acid sites uniformly distributed over the porous structure, which is obviously potential for industrial production of alkyl levulinates from carbohydrates and biomass.

Journal of Cleaner Production 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, Category: esters-buliding-blocks.

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

Shao, Yuewen published the artcileSulfated TiO2 nanosheets catalyzing conversion of biomass derivatives: influences of the sulfation on distribution of Bronsted and Lewis acidic sites, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is sulfated titanium oxide biomass conversion Bronsted Lewis acidic site.

The synthesis of solid acid catalysts of recoverable and environmentally friendly nature has gained increasing attention in recent years. The distribution of Bronsted and Lewis acidic sites on the surface of sulfated metal oxides determines the catalytic performance, which is affected by many key factors, such as the concentration of sulfuric acid impregnated and the morphol. of the metal oxides used. In this study, TiO2 nanosheets were successfully synthesized and used as carrier for the preparation of solid acid catalysts. The concentration of sulfuric acid for the impregnation resulted in various distributions of Bronsted and Lewis acidic sites on the surface of sulfated TiO2. With a medium concentration of sulfuric acid (1 mol L-1) for the impregnation, the highest ratio of Bronsted to Lewis acidic sites can be achieved, and the catalyst showed superior catalytic activity for the conversion of furfuryl alc. (FA) to Et levulinate (EL) in ethanol and the conversion of fructose to 5-hydroxymethylfurfural (HMF) in DMSO (DMSO). The sulfation of TiO2 nanosheets induced the formation of both Bronsted and Lewis acidic sites. The Bronsted acidic sites were more effective for catalyzing the conversion of FA or fructose. The poor recyclability of the 1.0-SO42-/TiO2 catalyst in the conversion of FA to EL in ethanol, a protic solvent, was due to the leaching of sulfur species. The deactivation of the catalyst in DMSO was due to coking, which could be resolved via calcination of the coke species in air.

Journal of Chemical Technology and Biotechnology 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, Recommanded Product: Ethyl 4-oxopentanoate.

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

Richter, Tobias M. published the artcileBinding and release of odor compounds from textiles: Changing fiber selection for apparel, Category: esters-buliding-blocks, the main research area is odor compound binding release textile fiber selection apparel.

Understanding odor volatiles known to constitute those emanating from the human body and how these interact with textiles is relevant to diverse interested parties because of changing fiber use, a better understanding of apparel life cycles including cleaning and the potential for fiber/textile re-use. This paper extends the application of our proton transfer reaction-mass spectrometry model system on adsorption and release behavior of fiber types typical of next-to-skin uses to include both viscose and other volatile organic compounds in body odor for which release has not previously been studied (hexanoic acid, acetone, cyclohexanone, hexanal, Me butanoate, Et benzene, 1-octanol, decanal, butanoic acid). The current findings confirmed release patterns of different fiber types found in our earlier studies – low release of volatile organic compounds from cotton and wool, but higher release from polyester – and made a new finding of low release from viscose. Adsorption characteristics were different given the different volatile organic compounds analyzed. Viscose showed better adsorption characteristics for primarily polar volatile organic compounds, but was otherwise very similar to cotton.

Textile Research Journal published new progress about Adsorption. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Category: esters-buliding-blocks.

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