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Hydrogen exchange reaction of three Argonne coals (Illinois No. 6, Upper Freeport and Pocahontas #3) and Wandoan coal with tritiated gaseous hydrogen were performed at several temperatures. Hydrogen exchange reaction was performed in a flow reactor packed with 0.4g of coal and 0.05g of catalysts under the following conditions: pressure 15kg/cm 2 , temperature 200, 250, 300 o C, carrier...
The hydrogen exchange of coal with gaseous hydrogen was carried out between 200 and 300°C using a pulse flow reaction system in the absence and presence of a Pt/Al2O3 catalyst to estimate the mobility of hydrogen in coals. In the absence of the catalyst, hydrogen exchange hardly occurred and hydrogen exchange ratio (HER) was fewer than 1% in most of coals used. Hydrogen exchange reaction between coal...
The rheological behaviour of Daqing crude oil with different incipient chain dimensions of the same ethylene-vinyl acetate copolymer, prepared with different solvents, solution concentrations and temperatures was studied. It was shown that the EVA flow improver with a compact incipient shape before addition to the oil is preferable for reduction of apparent viscosity, pour point and wax crystallization...
A new parameter has been developed to assess the efficiency of polymer flow improvers for waxy crude. The flow parameter, Q, depends on the interaction parameter for polymer-wax and polymer-resin-asphaltene, and is calculated by dilute solution viscometry. It was established that the improvement in rheological properties of doped crude oil, such as the reduction of apparent viscosity, pour point...
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