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- W2357052014 abstract "In order to increase the reaction rate in the formation of humic acid by air-oxidation of brown coal with the purpose of seeking a scientific as well as technical basis to see whether it is possible to adopt a continuous process in stead of the ordinary batch one, the oxidation of Tza-Lai-Nor brown coal in air-fluidized bed under pressure has been studied.Experiments were carried out in a simple fluidized-bed reactor made from alloyed steel. Effects of both pressure from 0 to 20 gauge atmospheres and temperatures from 150 to 1901-, on the rate of formation of humic acid were investigated. Experimental results have shown that the former has a more significant effect under which the time required for the oxidation process as the humic acid content of oxidized coal has attained a value of about 80% is in reverse proportion to absolute pressure of the system. On the other hand, effect of temperature has been shown playing also an important rule in the increase of rate of oxidation reaction. Owing to the constructional restriction of the reactor it is rather difficult to dissipate the huge amount of heat of reaction at some particular moment in the early period of oxidation, so that the seemingly maximum temperatures at corresponding pressures can hardly be further raised.Under the conditions of our experiments the most favorable technical data have been found to be. 20 atmospheres and 170℃, oxidation period 1.5 hrs. or alternately 5 atmospheres and 190℃, oxidation period 2.5~3 hrs. In both cases the humic acid contents of oxidized coals are in the range of 85~87% , and the carboxylic radical values are about 2.1~2.4 milliequivalents per gram of moisture-ash-free oxidized coal." @default.
- W2357052014 created "2016-06-24" @default.
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- W2357052014 date "1966-01-01" @default.
- W2357052014 modified "2023-09-25" @default.
- W2357052014 title "STUDIES ON THE PREPARATION OF HUMIC ACID BY THE MILD OXIDATION OF BROWN COAL IN AIR- FLUIDIZED BED UNDER PRESSURE" @default.
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