02lOOO50 Negative influence of enterprises of the Lviv-Volyn Basin engaged in coal production Ivan&iv, O
97/02439 New analytical methods for determining trace elements in coal
- Publisher
- Elsevier Science
- Year
- 1997
- Weight
- 202 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0140-6701
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β¦ Synopsis
The thermodynamics and kinetics of the diethylbenzene-benzene transalkylation have been studied in liquid phase over faujasite Y in a batch reactor. The reactions were conducted at several temperatures between 423 and 513 K. The main product of the reaction was ethylbenzene.
When the molar ratio of benzene over diethylbenzene was greater than five, a selectivity in ethylbenzene greater than 90% was found. The initial rates showed that the transalkylation reaction followed a first order mechanism. A kinetic model is proposed.
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A rapid analytical method has been developed for the determination of such trace elements as beryllium, chromium, copper, lead, manganese, nickel, vanadium and zinc in coal. Coal is combusted in the standard Parr oxygen bomb. When contamination from the bomb wall occurs, the bomb is equipped with a