Coprocessing of a Turkish lignite with a cellulosic waste material - 3. A statistical study on product yields and total conversion

Karaca F., Bolat E., Dincer S.

FUEL PROCESSING TECHNOLOGY, vol.75, no.2, pp.117-127, 2002 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 75 Issue: 2
  • Publication Date: 2002
  • Doi Number: 10.1016/s0378-3820(01)00253-3
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.117-127
  • Yıldız Technical University Affiliated: No


The objectives of this study were to evaluate statistically the effects of coprocessing parameters on liquefaction yields, to determine the key process variables affecting the oil+gas, oil and asphaltene yields and total conversion. A statistical experimental design based on Second Order Central Composite Desing was planned fixing the liquefaction period at 1 h. Parameters such as temperature, initial cold pressure, tetralin/(lignite+sawdust) and sawdust/lignite ratios coded as x(1), x(2), x(3) and x(4), respectively, were used. The parameters were investigated at five levels (-2, -1, 0, 1 and 2). The effects of these factors on dependent variables, namely, oil+gas, oil and asphaltene yields and total conversion were investigated. To determine the significance of effects, the analysis of variance with 99.9% confidence limits was used. It was shown that within the experimental ranges examined, temperature and sawdust/lignite ratio were the variables of highest significance for oil+gas yields, oil yields and total conversion. (C) 2002 Elsevier Science B.V. All rights reserved.