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A Xinjiang subbituminous coal was directly oxidized in aqueous sodium hypochlorite and sequentially extracted with diethyl ether and ethyl acetate. The extracts were esterified with diazomethane and the esterified products were analyzed using a high performance liquid chromatograph/mass spectrometer (HPLC/MS) equipped with atmospheric pressure photoionization (APPI) or electrospray ionization (ESI)...
An atmospheric pressure solids analysis probe (ASAP) was mounted on a commercial atmospheric pressure chemical ionization source with simple modifications. A series of coal-related model compounds (CRMCs) were analyzed using a time-of-flight mass spectrometry equipped with the ASAP ion source. The ionization mechanism and fragmentation pathways for CRMCs were investigated. The temperature of desolvation...
Diglycerides and monoglycerides are by-products of biodiesel production and are also considered contaminants in the final product. For now, USA and EU standards set limits on the permissible levels of bound glycerol. In this study, a simple and reliable method (TLC–FID) has been developed to determine hydrocarbons, fatty acid methyl esters, free fatty acid, triglycerides, diglycerides and monoglycerides,...
A alumina–magnesium composite oxide catalyst (Al–Mg) was synthesized for catalytic degradation of poly vinyl chloride (PVC) containing polymer mixtures, i.e. polypropylene (PP)/PVC, low-density polyethylene (LDPE)/PVC, polystyrene (PS)/PVC, and LDPE/PP/PS/PVC. In the catalytic degradations the Al–Mg composite oxide catalyst accelerated the rate of polymer degradation and lowered the carbon distribution...
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