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Numerical Optimization of the Process of Cellulose Isolation by Peroxide Delignification of Birch Wood in Acetic Acid-Water Medium in the Presence of TiO₂ Catalyst 醋酸-水介质中tio2催化剂作用下桦木过氧化脱木质素分离纤维素工艺的数值优化
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2021-03-01 DOI: 10.17516/1998-2836-0222
N. Garyntseva, I. Sudakova, A. Chudina, B. Kuznetsov
The possibility of isolation of high-quality cellulose by peroxide delignification of birch wood in an acetic acid-water medium in the presence of a TiO2 catalyst at a temperature of 100 °C was shown. The influence of the process conditions (concentration of hydrogen peroxide and acetic acid, liquid/wood ratio (LWR)) on the yield and composition of cellulose products was established. Numerical optimization of the process was carried out using a full factorial experiment. The optimal conditions for isolation from birch wood a cellulose product with residual lignin content of ≤ 1 wt.% are: СН3СООН concentration 23.8 wt.%, Н2О2 concentration 4.9 wt.%, LWR14.9, temperature 100 °C, time 4 h. Under these optimal conditions, the yield of a cellulose product with a cellulose content of 92.5 wt.% was 49.9 wt.%
在醋酸-水介质中,在TiO2催化剂的存在下,在100°C的温度下,通过桦木的过氧化物脱木质素分离高质量纤维素的可能性。考察了双氧水和乙酸浓度、液木比(LWR)等工艺条件对纤维素产率和产品组成的影响。采用全因子实验对该工艺进行了数值优化。从桦木中分离残余木质素含量≤1 wt.%的纤维素产品的最佳条件为:СН3СООН浓度23.8 wt.%, Н2О2浓度4.9 wt.%, LWR14.9,温度100℃,时间4 h。在此最佳条件下,纤维素含量为92.5 wt.%的纤维素产品得率为49.9 wt.%
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引用次数: 0
А New Method of Obtaining Transparent Conducting Films of Indium (III) Oxide and Indium-Tin Oxide А获得氧化铟(III)和氧化铟锡透明导电膜的新方法
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2021-03-01 DOI: 10.17516/1998-2836-0215
N. Fadeeva, S. Saikova, E. Pikurova, A. Voronin, Y. Fadeev, A. Samoilo, I. A. Tambasov
In the work, sedimentation-stable sols of indium (III) and tin (IV) hydroxides were obtained by the Anion Resin Exchange Precipitation, which consists of the exchange reaction between the OH ions of the anion exchange resin and the anions of metal-containing solutions. The synthesized hydrosols were used to obtain conducting films of indium (III) In2O3 oxide and indium oxide doped with Tin In2O3: Sn, with a surface resistance of 4 kOhm/sq, thicknesses of 200–500 nm and a transparency of more than 85 %. The modes of applying precursors to glass substrates by the modified spray method and centrifugation method are selected. Films were studied using XRD, SEM, optical microscopy and spectrophotometry
本文采用阴离子树脂交换沉淀法,通过阴离子交换树脂中的OH离子与含金属溶液中的阴离子的交换反应,获得了沉淀稳定的铟(III)和锡(IV)氢氧化物溶胶。将合成的水溶胶用于制备氧化铟(III) In2O3和氧化铟掺杂Tin In2O3: Sn的导电膜,其表面电阻为4 kOhm/sq,厚度为200 ~ 500 nm,透明度大于85%。选择了采用改进的喷雾法和离心法将前驱体涂在玻璃基板上的方式。采用XRD、SEM、光学显微镜和分光光度法对薄膜进行了研究
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引用次数: 0
Electrocatalytic Resorcinol Oxidation by Active Oxygen forms in Situ Generated in Conjugate Reactions on Pt and Pb/PbO₂ Anodes and Mesostructured Carbon Cathode СМК‑3 Pt、Pb/PbO 2阳极和介结构碳阴极СМК‑3共轭反应中原位生成的活性氧电催化间苯二酚氧化
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2021-03-01 DOI: 10.17516/1998-2836-0217
G. V. Kornienko, T. Kenova, V. L. Kornienko, A. Kukushkin
Kinetics and selectivity of indirect electrocatalytic resorcinol oxidation by active oxygen forms (AOF) in situ generated from oxygen in gas diffusion electrode (GDE) mesostructured carbon CMK‑3 and Pt, Pb/PbO2 at different pH were studied. The high resorcinol oxidation process effectivity in both Pt-GDE at pH=10 (99 %) and Pb/PbO2 + Fe2+ at рН=2 (99 %) systems was shown; the resorcinol oxidation scheme was proposed
研究了气体扩散电极(GDE)介结构碳CMK‑3和Pt、Pb/PbO2在不同pH下原位生成的活性氧形式(AOF)间接电催化间苯二酚氧化的动力学和选择性。在pH=10 (99%) Pt-GDE和рН=2 (99%) Pb/PbO2 + Fe2+体系中,间苯二酚的氧化效果都很高;提出了间苯二酚氧化方案
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引用次数: 0
NEXAFS–Spectra and Magnetic Susceptibility of Nickel and Chromium Doped of Bismuth Niobate 铌酸铋掺杂镍和铬的nexafs光谱和磁化率
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0187
I. Vasilyeva, S. Nekipelov, B. Makeev, Alexey G. Krasnov, N. Zhuk
The electronic state and character of exchange interactions of nickel and chromium atoms in solid solutions of Bi5Nb3-3xМ3xO15-δ (М-Cr,Ni) was researched by methods of magnetic susceptibility and NEXAFS-spectroscopy. NEXAFS spectra of nickel and chromium oxides were obtained. According to X-ray spectroscopy in solid solutions, chromium atoms are mainly in the charge state of Cr(III), and nickel atoms in the high-spin state of Ni(II) in octahedral coordination. In solid solutions, paramagnetic chromium and nickel atoms are present in the form of monomers and clusters with a common antiferromagnetic type of exchange
采用磁化率法和nexafs光谱法研究了Bi5Nb3-3xМ3xO15-δ (М-Cr,Ni)固溶体中镍和铬原子的电子态和交换相互作用的特征。获得了镍和铬氧化物的NEXAFS光谱。根据固溶体中的x射线光谱,铬原子主要处于Cr(III)的带电态,镍原子在八面体配位中处于Ni(II)的高自旋态。在固溶体中,顺磁性的铬和镍原子以单体和簇的形式存在,具有常见的反铁磁性交换类型
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引用次数: 0
Phenylvinylidene RePt Complexes Containing Diphenylphosphine Ligands at the Platinum Atom: Synthesis, IR, NMR Spectroscopic and Electrochemical Properties 铂原子上含二苯基膦配体的苯基偏二苯基铂配合物:合成、红外、核磁共振光谱和电化学性质
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0191
O. S. Chudin, V. V. Verpekin, G. V. Burmakina, Dmitry V. Zimonin, A. Kondrasenko, A. I. Rubaylo
The μ-phenylvinylidene complexes Cp(CO)2RePt(μ-C=CHPh)(PPh2H)(L) [L = PPh3 (1), P(OPri)3 (2)] were synthesized for the first time. Their IR, NMR spectroscopic and redox properties were studied. Based on IR, NMR spectroscopic data their molecular structures were proposed. The pathways of redox-reactions of the complexes were determined
首次合成了μ-苯基偏二配合物Cp(CO)2RePt(μ-C=CHPh)(PPh2H)(L) [L = PPh3 (1), P(OPri)3(2)]。研究了它们的红外光谱、核磁共振光谱和氧化还原性能。根据红外、核磁共振光谱数据,提出了它们的分子结构。确定了配合物的氧化还原反应途径
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引用次数: 0
Extraction of Scandium Halides with Mixtures of Tributylphosphate and Molecular Iodine 磷酸三丁酯与分子碘混合萃取卤化钪
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0194
V. Kuzmin, A. Kuzmina, S. Kalyakin, M. A. Mulagaleeva
The extraction of scandium chlorides, bromides and iodides from aqueous solutions with mixtures of tributyl phosphate (TBP) and molecular iodine was studied. Extraction of scandium halides using TBP with the addition of iodine increases by more than 100 times. Salt distribution coefficients increase in the series ScCl3
研究了用磷酸三丁酯(TBP)和分子碘的混合物从水溶液中萃取氯化钪、溴化物和碘化物。加入碘后,TBP法对卤化钪的提取率提高了100倍以上。盐分布系数在ScCl3系列中增大
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引用次数: 0
Sulfation of Betulin with Chlorosulfonic Acid in Pyridine 吡啶中白桦林与氯磺酸的磺化反应
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0197
N. Vasilyeva, A. S. Kazachenko, Y. Malyar, B. Kuznetsov
It was found that when betulin is sulfated with chlorosulfonic acid in pyridine medium, 3,28-disulfate of betulin is formed in a stable salt form. Under optimal synthesis conditions: temperature 70 °C, duration 2 hours, molar ratio betulin / chlorosulfonic acid 4.0, betulin is completely converted into betulin 3.28-disulfate. The structure and composition of betulin 3,28-disulfate were confirmed by elemental analysis, IR, Raman and 13C NMR spectroscopy. Betulin 3,28-disulfate was isolated both in the form of an unstable H + -form and in a stable forms of sodium and pyridinium salts. Sodium salt of 3,28-disulfate is a needle-like crystals collected in cobweb-like aggregates. The sodium salt of 3,28-disulfate has mycellar properties, the critical concentration of mycellar formation is 0.23 mmol / L.
结果表明,在吡啶介质中,用氯磺酸对桦木素进行磺化处理,可形成以稳定盐形态存在的3,28-二硫酸盐。在最佳合成条件下:温度70℃,持续时间2小时,桦木素/氯磺酸的摩尔比为4.0,桦木素完全转化为桦木素3.28-二硫酸盐。通过元素分析、红外光谱、拉曼光谱和13C核磁共振光谱等手段,确定了桦木素3,28-二磺酸盐的结构和组成。桦木素3,28-二硫酸酯既以不稳定的H +形式分离,又以稳定的钠盐和吡啶盐形式分离。3,28-二硫酸钠是一种针状晶体,呈蛛网状聚集。3,28-二硫酸钠具有mycellar特性,mycellar形成的临界浓度为0.23 mmol / L。
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引用次数: 5
Synthesis of 4-(1-Adamantyl)-1-Naphthol and 4-(1-Adamantyl)-1-Methoxynaphthalene 4-(1-金刚烷基)-1-萘酚和4-(1-金刚烷基)-1-甲氧基萘的合成
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0185
A. Kondrasenko, I. Peterson, A. I. Rubaylo
Adamantylation of 1-napthol and 1-methoxynaphthol in the mixture of phosphoric and glacial acetic acids leads to the formation of 2- and 4-substituted products. Formed products are less involved into the further oxidative transformations in used conditions
在磷酸和冰乙酸的混合物中,1-萘酚和1-甲氧基萘酚发生金刚烷化反应,形成2-和4-取代产物。在使用条件下,形成的产物较少参与进一步的氧化转化
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引用次数: 1
Influence of Chemical Additives on the Properties of Composite Materials Based on Fine-Dispersed High-Calcium Fly Ash 化学添加剂对细分散高钙粉煤灰复合材料性能的影响
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0192
O. M. Sharonova, V. M. Kirilets, L. Solovyov, A. Anshits
Composite materials (CM) were obtained on the basis of fine- dispersed high-calcium fly ash (HCFA), selected from the 4th field of electrostatic precipitators of Krasnoyarsk TPP-2, with the addition of Melflux 5581F superplasticizer at the water: binder ratio W/B = 0.25. The influence of the concentration of superplasticizer in the range 0.06-0.6 wt. % on the strength properties of composite materials was studied. The effect of the addition of sodium sulfate as an accelerator of hydration hardening and additives-retarders of sodium phosphate, sodium tetraborate and citric acid, were studied. The optimal concentration of superplasticizer was established (0.3 wt. %). It was determined that sodium sulfate helps to improve the strength of CM, and the addition of sodium tetraborate and citric acid can effectively regulate the setting time
以克拉斯诺亚尔斯克TPP-2静电除尘器第4场的细分散高钙粉煤灰(HCFA)为基础,在水胶比W/B = 0.25的条件下,添加Melflux 5581F高效减水剂,得到复合材料(CM)。研究了高效减水剂浓度在0.06 ~ 0.6 wt. %范围内对复合材料强度性能的影响。研究了硫酸钠作为水化硬化的促进剂和磷酸钠、四硼酸钠和柠檬酸作为水化硬化的缓凝剂的作用。确定了高效减水剂的最佳浓度(0.3 wt. %)。结果表明,硫酸钠有助于提高CM的强度,四硼酸钠和柠檬酸的加入可有效调节凝固时间
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引用次数: 1
The Extraction of the Nitrates of the Rare Earth Metals by Mixtures of Binary and Neutral Extractants 二元萃取剂与中性萃取剂混合萃取稀土金属中的硝酸盐
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0189
S. Kalyakin, M. A. Mulagaleeva, A. Kuzmina
The extraction of the nitrates of the rare earth metals with mixtures consisting of binary extractants was explored: 2-ethylhexyl-mono-2-ethylhexyl ether phosphonate tri-n-octylamine, di- (2-ethylhexyl) phosphate tri-n-octylamine and a neutral extractant (solvating reagent) – tri-n-octylamine nitrate. It was established that the extraction of the nitrates of the REM occurs in accordance with the patterns of binary extraction. Extraction systems are characterized by high selectivity in regard to rare-earth metalsPages
研究了由2-乙基己基-单-2-乙基己基醚膦酸三辛胺、二(2-乙基己基)磷酸三辛胺和中性萃取剂硝酸三辛胺组成的二元萃取剂对稀土金属中硝酸盐的萃取。确定了REM中硝酸盐的萃取符合二元萃取模式。萃取体系对稀土金属具有高选择性的特点
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引用次数: 0
期刊
Journal of Siberian Federal University. Chemistry
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