Thermal dissolution of Shengli and Xiaolongtan lignites in methanol and analysis of the soluble portions was written by Yan, Jie;Zhao, Yun-peng;Xiao, Jian;Tian, You-jia. And the article was included in Ranliao Huaxue Xuebao in 2016.Quality Control of Dimethyl decanedioate This article mentions the following:
Thermal dissolution behaviors of Shengli (SL) and Xiaolongtan (XLT) lignite in methanol were investigated. The composition and structural characteristics of soluble portions (SPs) obtained at 320degree were characterized with Fourier transform IR spectroscopy, gas chromatograph/mass spectrometer (GC/MS) and atm. solid anal. probe/time of flight mass spectrometer (ASAP/TOF-MS). For the two lignites, the yield of SPs increase with temperature increasing, while the yield of SPs from XLT (SPXLT) is obvious higher than that from SL (SPSL) above 240 degree. GC/MS anal. results show that compounds in the SPs are dominated in oxygen-containing organic species, especially the relative content of phenols is higher than 49%. The relative contents of alkenes, arenes, ethers, carboxylic acids, esters, organosulfur compounds (OSCs) in SPSL are higher, while the relative contents of alkanes, phenols, ketones and organonitrogen compounds in SPSL are lower than those in SPXLT. Addnl., the OSCs in SPSL and SPXLT are mainly composed of thiophenes and mercaptan, resp. Many compounds with high polarity and low volatility which could not be identified by GC/MS were identified using ASAP/TOF-MS. The relative contents of CHO and CHS class species in SPSL are higher, but the relative contents of CHN, CHNO, CHOS, CHNS and CHNOS in SPSL are lower than those in SPXLT. The carbon number and double bond equivalent (DBE) of the compounds in SPSL and SPXLT mainly distribute in 0-10 and 3-15, resp., while the distribution of carbon number and DBE of the compound in SPXLT are more concentrated than those in SPSL. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Quality Control of Dimethyl decanedioate).
Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Quality Control of Dimethyl decanedioate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics