Characteristics and mechanism of adsorption of tartaric acid by carbide slag ascertained and applied to prepare a binder

The mechanism of the enzymatic iodination process of diethylmaleate and diethylfumarate (which present no miscibility with water) in the presence of lactoperoxidase, both in diluted hydrogen peroxide solution and in a generating system of hydrogen peroxide using ammonium and calcium iodides as halide sources in disperse system (after an ultrasonic pretreatment) was studied. The obtained sole product (diethyl-2, 3-diiodosuccinate) after the enzymatic iodination process was directly hydrolyzed to a tartaric acid present in an optically inactive form. The mechanism of obtaining the intermediate and final products and respectively, the existence of both D, L-tartaric acid and meso-tartaric acids (as lithium bitartrates) were also investigated.

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Synthesis and Kinetics of Highly Substituted Piperidines in the Presence of Tartaric Acid as a Catalyst

Combinatorial Chemistry & High Throughput Screening ◽

10.2174/1386207321666180228115130 ◽

2018 ◽

Vol 21 (4) ◽

pp. 302-311

Author(s):

Younes Ghalandarzehi ◽

Mehdi Shahraki ◽

Sayyed M. Habibi-Khorassani

Keyword(s):

Ambient Temperature ◽

Tartaric Acid ◽

Aromatic Aldehydes ◽

One Pot ◽

Rate Determining Step ◽

State Approximation ◽

Solvent Free Conditions ◽

Steady State Approximation ◽

Absorbance Changes ◽

The One

Aim & Scope: The synthesis of highly substituted piperidine from the one-pot reaction between aromatic aldehydes, anilines and β-ketoesters in the presence of tartaric acid as a catalyst has been investigated in both methanol and ethanol media at ambient temperature. Different conditions of temperature and solvent were employed for calculating the thermodynamic parameters and obtaining an experimental approach to the kinetics and mechanism. Experiments were carried out under different temperature and solvent conditions. Material and Methods: Products were characterized by comparison of physical data with authentic samples and spectroscopic data (IR and NMR). Rate constants are presented as an average of several kinetic runs (at least 6-10) and are reproducible within ± 3%. The overall rate of reaction is followed by monitoring the absorbance changes of the products versus time on a Varian (Model Cary Bio- 300) UV-vis spectrophotometer with a 10 mm light-path cell. Results: The best result was achieved in the presence of 0.075 g (0.1 M) of catalyst and 5 mL methanol at ambient temperature. When the reaction was carried out under solvent-free conditions, the product was obtained in a moderate yield (25%). Methanol was optimized as a desirable solvent in the synthesis of piperidine, nevertheless, ethanol in a kinetic investigation had none effect on the enhancement of the reaction rate than methanol. Based on the spectral data, the overall order of the reaction followed the second order kinetics. The results showed that the first step of the reaction mechanism is a rate determining step. Conclusion: The use of tartaric acid has many advantages such as mild reaction conditions, simple and readily available precursors and inexpensive catalyst. The proposed mechanism was confirmed by experimental results and a steady state approximation.

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Influence of substrate on modified oscillation reactions of the Belousov-Zhabotinskii type

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19833223 ◽

1983 ◽

Vol 48 (11) ◽

pp. 3223-3228 ◽

Cited By ~ 2

Author(s):

Peter Ševčík ◽

Ľubica Adamčíková

Keyword(s):

Oxalic Acid ◽

Kinetic Parameters ◽

Tartaric Acid ◽

Bz Reaction ◽

Oscillation Cycle ◽

Influence Of Substrate

The kinetic parameters of the reaction steps of the oscillation cycle and the parameters of modified oscillation reactions of the Belousov-Zhabotinskii (BZ) type with oxalic acid, tartaric acid, and hypophosphite ions were compared with predictions of Edelson's analysis based on the mechanism of the classical BZ reaction.

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Regulating Effect of Cement Accelerator on High Content Solid-Wastes Autoclaved Aerated Concrete (HCS-AAC) Slurry Performance and Subsequent Influence

Materials ◽

10.3390/ma14040799 ◽

2021 ◽

Vol 14 (4) ◽

pp. 799

Author(s):

Dingkun Xie ◽

Lixiong Cai ◽

Jie Wang

Keyword(s):

Mechanical Properties ◽

Mechanical Property ◽

Solid Wastes ◽

Hydration Products ◽

Promoting Effect ◽

Adverse Side Effects ◽

Foaming Process ◽

Carbide Slag ◽

Negative Effect ◽

Aerated Concrete

Adverse side-effects occurred in slurry foaming and thickening process when carbide slag was substituted for quicklime in HCS-AAC. Cement accelerators were introduced to modify the slurry foaming and coagulating process during pre-curing. Meanwhile, the affiliated effects on the physical-mechanical properties and hydration products were discussed to evaluate the applicability and influence of the cement accelerator. The hydration products were characterized by mineralogical (XRD) and thermal analysis (DSC-TG). The results indicated that substituting carbide slag for quicklime retarded slurry foaming and curing progress; meanwhile, the induced mechanical property declination had a negative effect on the generation of C–S–H (I) and tobermorite. Na2SO4 and Na2O·2.0SiO2 can effectively accelerate the slurry foaming rate, but the promoting effect on slurry thickening was inconspicuous. The compressive strength of HCS-AAC obviously declined with increasing cement coagulant content, which was mainly ascribed to the decrease in bulk density caused by the accelerating effect on the slurry foaming process. Dosing Na2SO4 under 0.4% has little effect on the generation of strength contributing to hydration products while the addition of Na2O·2.0SiO2 can accelerate the generation and crystallization of C–S–H, which contributed to the high activity gelatinous SiO2 generated from the reaction between Na2O·2.0SiO2 and Ca(OH)2.

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A Short Enantioselective Synthesis of (S)-Levetiracetam Through Direct Pd-Catalyzed Asymmetric N-Allylation of Methyl 4-Aminobutyrate

Synlett ◽

10.1055/a-1493-9078 ◽

2021 ◽

Author(s):

Dominik Albat ◽

Jörg-Martin Neudörfl ◽

Hans-Günther Schmalz

Keyword(s):

Antiepileptic Drug ◽

Tartaric Acid ◽

Enantioselective Synthesis

An exceedingly short and enantioselective synthesis of the antiepileptic drug (S)-levetiracetam was elaborated. As the chirogenic key step a Pd-catalyzed asymmetric N-allylation of methyl 4-aminobutyrate was achieved in the presence of only 1 mol% of a catalyst prepared in situ from [Pd(allyl)Cl]2 and the tartaric acid-derived C2-symmetric diphosphane ligand (S,S)-iPr-MediPhos).

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Rare Earth and Tetra Hydroxymethyl Phosphonium Sulfate Combination Tanning

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.479-481.430 ◽

2012 ◽

Vol 479-481 ◽

pp. 430-433

Author(s):

Ya Li ◽

Shuang Xi Shao ◽

Lan Jiang ◽

Kai Qi Shi

Keyword(s):

Rare Earth ◽

Tartaric Acid ◽

Alkaline Ph ◽

Uv Spectrum ◽

Shrinkage Temperature

A new chrome free tanning system of rare earth (RE)-THPS has been developed in this study. It has been proved by UV spectrum that THPS and RE (CeCl3) can coordinate under certain conditions. The influence of CeCl3and THPS’s ratio, pH and ligands on the shrinkage temperature (Ts) was studied. Higher Ts was obtained while the tannage was processed in the sequence of THPS followed by CeCl3. The alkaline pH should be controlled between 5.5 and 6.0 to give ideal tanning effect. It was also found that employing of 0.5% tartaric acid in this combination tanning system can give high Ts of 89°C.

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Multitasking tartaric-acid-enabled, highly conductive, and stable MXene/conducting polymer composite for ultrafast supercapacitor

Cell Reports Physical Science ◽

10.1016/j.xcrp.2021.100449 ◽

2021 ◽

pp. 100449

Author(s):

Miao Zhang ◽

Frédéric Héraly ◽

Ming Yi ◽

Jiayin Yuan

Keyword(s):

Tartaric Acid ◽

Conducting Polymer ◽

Polymer Composite

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H2S removal performance of Ca3Al2O6-stabilized carbide slag from CO2 capture cycles using calcium looping

Fuel Processing Technology ◽

10.1016/j.fuproc.2021.106845 ◽

2021 ◽

Vol 218 ◽

pp. 106845

Author(s):

Yuping Hu ◽

Shuimu Wu ◽

Yingjie Li ◽

Jianli Zhao ◽

Shijian Lu

Keyword(s):

Co2 Capture ◽

H2s Removal ◽

Calcium Looping ◽

Carbide Slag

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Desulfurization and Denitrification Performance of Modified Rice Husk Ash-Carbide Slag Absorbent

Materials ◽

10.3390/ma14010068 ◽

2020 ◽

Vol 14 (1) ◽

pp. 68

Author(s):

Yali Wang ◽

Xiaoning Han ◽

Meina Chen ◽

Suping Cui ◽

Xiaoyu Ma ◽

...

Keyword(s):

Functional Groups ◽

Rice Husk ◽

Rice Husk Ash ◽

Research Direction ◽

Cement Industry ◽

Hydration Process ◽

Air Pollution Control ◽

Large Area ◽

Carbide Slag ◽

High Investment

In the cement industry, SO2 and NOx are generally removed separately. There are many problems, such as large area, high investment cost, secondary pollution and so on. Desulfurization and denitrification technology have become a frontier research direction in the field of air pollution control. In this paper, rice husk ash and carbide slag were compounded and modified to prepare modified rice husk ash-carbide slag composite absorbent, and its desulfurization and denitrification performance and mechanism were studied. The results showed that the NO conversion and SO2 conversion of the modified rice husk ash-carbide slag composite absorbent increased by 44% and 2%, respectively, at 700 °C. Fibrous calcium silicate and calcium silicoaluminate hydrates were formed during the hydration process, which made the specific surface area of the absorbent larger and provided more reactive sites. The hydration process increases the content of oxygen-containing functional groups, decreases the hydroxyl/ether C–O functional groups, and increases the content of carboxyl–COO functional groups are conducive to the denitrification reaction.

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