共查询到20条相似文献,搜索用时 15 毫秒
1.
V. K. Marinich O. V. Firsova G. A. Gendel'man G. G. Evseeva S. M. Naigauz 《Fibre Chemistry》1970,1(4):459-461
Conclusions 1. The composition of water obtained after removing lubricant by the aluminate method and further softening scarcely differs at all from that of softened water and can be re-used in industry.2. The flowsheet described enables a closed purification cycle to be built and finishing waste waters to be used; it enables the water consumption for fibre washing to be reduced, the discharge of toxic caprolactam to reservoirs to be discontinued and caprolactam to be recycled.Kiev Combine. Translated from Khimicheskie Volokna, No. 4, pp. 76–78, July–August, 1969. 相似文献
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Direct synthesis of liquefied petroleum gas (LPG) from a low-cost syngas derived from partial oxidation of methane with air (air-POM) was investigated over a hybrid catalyst consisting of methanol synthesis catalyst and Pd-modified Y-zeolite. The hybrid catalyst demonstrated a high activity and more than 73% selectivity for LPG fraction. BET, NH3-TPD and TPO-MS were carried out to study the properties of Pd-Y before and after reaction. The results indicated that coke deposition on Pd-Y was the main contribution to the slow deactivation of hybrid catalyst. 相似文献
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The intrinsic kinetics of oil generation from 0.124 dm3 kg?1 Chinese oil shale were determined by a non-isothermal method. Overall first-order kinetics satisfactorily represented the mechanism of kerogen decomposition. The kinetic parameters were determined as 142.8 kJ mol?1 and 7.495 × 106 s?1 for activation energy and pre-exponential factor, respectively. 相似文献
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《Applied Clay Science》2007,35(1-2):25-30
Because of the similarity of the XRD-patterns, well-ordered opal-C and opal-CT have been misidentified as α-cristobalite in many publications. This is important, because flying α-cristobalite is probably a human carcinogen and the opals are not. The evidence of α-cristobalite in bentonites is hazardous for the human health and reduces their marketing. To distinguish the opal-C and opal-CT from α-cristobalite, the XRD-patterns of bentonites before and after H3PO4-digestion (240 °C, 15 min) and heat treatment (1050 °C, 24 h) were evaluated in details. It was seen that the most characteristic XRD-reflection (hkl:101) centered near 0.40 nm for crystalline α-cristobalite and paracrystalline opals disappeared after the digestion and sharpened after the heat treatment. Since the crystallinity of α-cristobalite was not affected from the digestion and the heat treatment, it was concluded that the bentonites contain opal-CT or opal-C in amorphous opal-A matrix, but do not contain α-cristobalite. Since the paracrystallinity increases in order opal-CT and opal-C, the narrowing in full width at half-maximum reflection height (FWHM) 101 must be more for opal-CT than opal-C by heat treatment. Therefore, these opals were distinguished approximately from each other depending on the narrowing in the FWHM of 101 XRD-reflection by heating. Based on this result, it would not be decided that whether bentonites or other clays contain α-cristobalite or not, without performing the H3PO4-digestion and heat treatment. 相似文献
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D. E. Anders E. H. Pryde J. C. Cowan 《Journal of the American Oil Chemists' Society》1965,42(10):824-827
Investigations were carried out on reductive amination of caproaldehyde, pelargonaldehyde and azelaaldehydate esters, obtainable
from ozonolysis of soybean oil products, with ammonia and hydrogen in the presence of nickel catalyst. A solvent system giving
good yields of primary amine while suppressing amide formation was devised. Excess ammonia and homogeneous solutions suppressed
secondary amine formation. Nonpolar solvents suppressed ammonolysis. Optimum conditions for reaction varied with the aldehyde.
Excellent yields of hexylamine (91%), nonylamine (90%), methyl 9-aminononanoate (92%) and butyl 9-aminononanoate (93%) were
obtained from caproaldehyde, pelargonaldehyde, methyl azelaaldehydate and butyl azelaaldehydate, respectively, when aminated
in anhydrous ammonia and either cyclohexane or methyl cyclohexane.
Presented at the AOCS meeting, Chicago, 1964.
A laboratory of the No. Utiliz. Res. and Dev. Div., ARS, USDA. 相似文献
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Ana Paula Capeto Braian Buitrago Uribe Manuela Pintado Ana Sofia Guimarães Ana L. S. Oliveira 《应用聚合物科学杂志》2024,141(10):e55065
In the context of the 21st century, the integration of diverse perspectives within the circular economy framework, encompassing waste management, economic growth, and environmental sustainability, stands out as a paramount challenge. Addressing this challenge, an innovative avenue emerges through the application of microbial oil to replace traditional petroleum in the synthesis of essential commodity chemicals. This groundbreaking study takes a significant step toward this goal by introducing a pioneering polyester material boasting an exceptionally high renewable content. This material is synthesized through melt polycondensation, utilizing a novel primary feedstock derived from the oily residue extracted post-distillation of β-farnesene (FDR). The ingenious approach involves fermenting sugarcane syrup using a genetically engineered yeast strain of Saccharomyces cerevisiae. The outcome of this study reveals the creation of an amorphous polymer with rubber-like attributes. These attributes include a Young's modulus of 3.9 MPa, with a maximum elastic strain and tensile stress values of 185.4% and 510 KPa, respectively, along with distinctive strain-hardening characteristics. Remarkably, this material also exhibits indications of shape memory behavior in a temperature range spanning from −47 to 12°C, as discerned from dynamic mechanical analysis. Evidently, this novel polymer demonstrates exceptional promise in the realm of low-temperature applications. Its intrinsic ability to uphold mechanical integrity, even when subjected to substantial deformations within its service conditions, positions it as an invaluable resource for various components requiring resilience in challenging environments. 相似文献
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目的优化巢湖蓝藻藻蓝蛋白的纯化工艺。方法将新鲜蓝藻藻泥经冻融破壁处理,获得藻蓝蛋白粗提液。采取两步盐析及Cellfine A-500阴离子交换层析结合法进行纯化,并以纯度和回收率为检测指标,对一步盐析摩尔浓度(0.8、1.0、1.2、1.4、1.6 mol/L)及二步盐析摩尔浓度(1.6、1.8、2.0、2.2、2.4 mol/L)、阴离子交换层析缓冲液pH(6.0、6.5、7.0、7.5、8.0)、进样浓度(0.418、0.726、1.044、1.288、2.090 mg/L)、洗脱速度(0.5、1、1.5、2、2.5、3.0 cm/min)及洗脱液盐梯度浓度[(0.08、0.10、1.0)、(0.08、0.15、1.0)、(0.08、0.20、1.0)、(0.08、0.25、1.0)、(0.08、0.30、1.0)mol/L]进行优化。同时采用最适条件纯化3批藻蓝蛋白。结果两步盐析的最适摩尔浓度分别为1.0和1.8 mol/L,阴离子交换层析最适条件为缓冲液p H 7.0,进样浓度为1.0~2.0 mol/L,洗脱流速为2 cm/min,洗脱液盐梯度浓度为0.08、0.20、1.0 mol/L。最适条件纯化的3批藻蓝蛋白纯度可达4.0以上,回收率达11%以上。结论成功优化了巢湖蓝藻藻蓝蛋白的纯化工艺,纯化出了试剂级(纯度4.0以上)的藻蓝蛋白。 相似文献
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Jozef Lacek Judith García-Gonzlez Wolfram Weckwerth Katarzyna Retzer 《International journal of molecular sciences》2021,22(23)
The root is the below-ground organ of a plant, and it has evolved multiple signaling pathways that allow adaptation of architecture, growth rate, and direction to an ever-changing environment. Roots grow along the gravitropic vector towards beneficial areas in the soil to provide the plant with proper nutrients to ensure its survival and productivity. In addition, roots have developed escape mechanisms to avoid adverse environments, which include direct illumination. Standard laboratory growth conditions for basic research of plant development and stress adaptation include growing seedlings in Petri dishes on medium with roots exposed to light. Several studies have shown that direct illumination of roots alters their morphology, cellular and biochemical responses, which results in reduced nutrient uptake and adaptability upon additive stress stimuli. In this review, we summarize recent methods that allow the study of shaded roots under controlled laboratory conditions and discuss the observed changes in the results depending on the root illumination status. 相似文献
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Isolation and characterization of bacteria from engine sludge generated from biodiesel-diesel blends
Fuel filter clogging is often a major concern of biodiesel application. Excessive sludge formed from a biodiesel-diesel fuel blend in the fuel system of marine ferries was investigated in this study to determine the sources of the sludge. Microbes were found as the major cause of sludge and the isolates were further investigated. Three types of predominant growing bacteria were isolated. These isolates were identified as Klebsiellaoxytoca, Klebsiellanov. sp., and Staphylococcusepidermidis based on morphological, biochemical, physiological and molecular evidences. All three microbes can grow vigorously in temperatures between 28 and 37 °C, with Klebsiellaoxytoca and Klebsiella nov. sp. growing at temperatures as low as 20 °C. Klebsiellaoxytoca produced significant amounts of exopolysaccharides as indicated by polyacrylamide gel electrophoresis (PAGE). Ion chromatography measurement showed that the exopolysaccharides consisted of galactose, glucose, and xylose. In a simulated biodiesel-diesel blend (5% of biodiesel in diesel) - tap water system, Klebsiellaoxytoca showed obvious growth and formed extra sludge while the other two isolates did not. The results confirmed that microbial activities in the fuel system of marine ferries are one of the major causes of excessive sludge (solid waste) formation, leading to filter clogging. This is the first report on the activities of Klebsiella and Staphylococcus in the usage of biodiesel, diesel, or their blends. The results lead to a solution to ensure clogging-free fuel system when using biodiesel-diesel blends in marine environments by applying proper biocides. 相似文献
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《Ceramics International》2016,42(8):10058-10065
Mechanical behaviour of SiC ceramics synthesized from two artificial precursors from plants – coir fibreboard and bamboo pulp fibreboard – was studied and the mechanical properties – flexural strength, Young's modulus, fracture toughness and hardness – of the ceramics synthesized from the two kinds of artificial precursors were compared. The effect of processing of the artificial precursors, as reflected in the microstructure of the ceramics synthesized from them, was taken into consideration in the analysis of the mechanical property data; these data could also be possible to be explained by the empirical models of fracture mechanics. The results of the study established the possibility of application of the investigated SiC materials as structural ceramics. 相似文献
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《Ceramics International》2017,43(9):7142-7146
Rice husk has been used as a thermal energy source for electricity generation, resulting in the formation of silica from rice husk as a by-product. This research aims to develop refractory ceramic materials by replacing kaolin clay with rice husk silica at 5%, 10% and 20% volume percentages. The samples were investigated in terms of their density, apparent porosity, tensile strength in three-point bending test, compressive strength, thermal shock and mineralogical composition. The use of 20% silica resulted in an increase in the formation of cristobalite, higher packing of granular mixtures, and consequently, an improvement in the tensile strength and compression strength of the samples. However, the material that was most successful in increasing the mechanical strength without decreasing the thermal shock strength was the sample processed with 10% clay replacement by silica from rice husk. 相似文献
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Vilma Sanhueza Ursula Kelm Ruby Cid 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2003,78(5):485-488
A high mordenite product was obtained from a natural raw material, diatomite, either with or without the presence of diethanolamine. The synthesis process took 2 days, and was carried out under hydrothermal conditions, at autogenic pressure, and at a temperature of 180 °C. The resulting crystals were identified as mordenite by X‐ray diffraction and characterized by scanning electron microscopy, and differential thermal and gravimetric analyses. Copyright © 2003 Society of Chemical Industry 相似文献
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A. P. Lisityn A. Z. Vdovina G. Ya. Rudinskaya V. G. Zhuravskii T. V. Yushkova A. T. Kalashnik 《Fibre Chemistry》1987,18(5):398-400
Conclusions The thermooxidative stability of celluloses prepared from deciduous and evergreen varieties of wood has ben investigated by methods of thermal analysis.It has been found that deciduous celluloses are less stable to oxidation processes as compared with evergreen celluloses, since they have an increased content of low-molecular fractions.Translated from Khimicheskie Volokna, No. 5, pp. 48–49, September–October, 1986. 相似文献