Xn:Harmful;
584-08-7Relevant articles and documents
Depolymerization of alkaline lignin over mesoporous KF/: γ -Al2O3
Guan, Yinshuang,Zhao, Wei,Liu, Kaishuai,Guo, Tiantian,Wang, Dingkai,Cui, Mingyu,Fu, Shuiyuan,Fan, Xing,Wei, Xianyong
, p. 14411 - 14420 (2020)
As a kind of biomass resource, lignin is the only natural renewable resource that can provide abundant aromatic compounds, which is undoubtedly considered as the best candidate to produce value-added chemicals by lignin depolymerization. Thus, it is of great significance to develop approaches that are able to accommodate the complex structure of lignin. Herein, an efficient depolymerization method is implemented in methanol using a mesoporous solid superbase KF/γ-Al2O3 catalyst. Research shows that the depolymerization of lignin is not obvious below the critical temperature of methanol, and the conversion of lignin increases significantly above the critical temperature, which can reach 60.6% at 270 °C. Phenols and methoxy-substituted monocyclic aromatic compounds are predominant in the liquid products acquired by gas chromatography/mass spectrometry. Furthermore, oligomers were analyzed by time-of-flight mass spectrometry equipped with electrospray ionization. It is found that the molecular mass of the oligomers varied between 200 and 600 Da, the degree of unsaturation is mainly 4 and 8 with 1-2 aromatic rings, and the carbon number is found to be within the range of 15-30. It is speculated that the oligomers are mainly monophenyl or biphenyl compounds containing branched chains.
New Phase Transition at 155 K and Thermal Stability in KHCO3
Lee, Kwang-Sei,Kim, Ill Won
, p. 3581 - 3584 (2001)
The differential scanning calorimetry and thermogravimetry of KHCO3 indicate new transformation anomalies at 155 K (Tc2), 373 K (Td) and 459 K. The former anomaly is likely to be caused by a structural phase transition, but the latter two anomalies are related to the thermal decomposition. The chemical reaction begins at about 373 K (Td) and reaches a complete thermal decomposition of KHCO3 into K2CO3 around 459 K. The experimental results are discussed in terms of protonic intrabond and interbond jump.
Crystal structure dependent in vitro antioxidant activity of biocompatible calcium gallate MOFs
Hidalgo, Tania,Cooper, Lucy,Gorman, Martin,Lozano-Fernández, Tamara,Simón-Vázquez, Rosana,Mouchaham, Georges,Marrot, Jérome,Guillou, Nathalie,Serre, Christian,Fertey, Pierre,González-Fernández,Devic, Thomas,Horcajada, Patricia
, p. 2813 - 2822 (2017)
Two novel 3-D coordination polymers, denoted MIL-155 and MIL-156 (MIL stands for Materials Institute Lavoisier), built up from calcium and the naturally occurring gallic acid (H4gal), have been hydrothermally synthesized and their crystal struc
Werner,E. A.
, (1888)
PROCESS FOR PRODUCING LACTATE
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Page/Page column 16, (2015/11/17)
A process for producing an alkali metal lactate comprising: a) reacting a stream rich in saccharide with barium hydroxide to produce a first reaction mixture comprising barium lactate; and b) contacting at least a portion of said first reaction mixture with an alkali metal hydroxide to produce a second reaction mixture comprising alkali metal lactate and solid barium hydroxide, wherein the alkali metal is selected from the group consisting of sodium, lithium and potassium.
New Complexes of Ruthenium, Method for Their Preparation, and Their Application in Olefin Metathesis Reactions
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Page/Page column, (2014/06/25)
The present invention provides new ruthenium complexes of Formula (1), which contain a chelate ring created by a halogen atom X. The invention concerns also a method for the preparation of the new ruthenium complexes and their application in metathesis reactions.
