摘要:

AbstractThe intrinsic reaction rate constant for calcium carbonate decomposition was determined based on a structural model (grain model). Experiments were conducted with thin slab type pellets (thickness 0.044 ‐ 0.086 cm) in the temperature range of 670‐740°C under isothermal conditions for determining the rate constant. The effective diffusivity, effective thermal conductivity, and heat and mass transfer coefficients were determined from experimental data obtained from cylindrical pellets (L/D ≈︁ 1) at 840 and 875°C, taking into consideration the temperature variations in the solid. The results obtained are in good agreement with the values reported in l

ISSN:0008-4034    

DOI:10.1002/cjce.5450710322

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractThe development and optimisation of the synthesis of an analogue of jojoba oil has been carried out. The product is an ester with characteristics similar to those of sperm whale oil and jojoba oil. This permits its use as a substitute for these two natural oils. A central composite design has been used in the synthesis of this fine chemical. The variables selected for the present study are reaction temperature, initial concentration of catalyst and working pressure. Temperature is the most significant factor in the esterification process, and its influence is positive. Pressure has a negative influence, and the concentration of catalyst a positive influence, on the process. Depending on the temperature value, the influence of the interactions can be more important than that of the other two main effects, pressure and catalyst concentration. Response surface models have been found adequately to represent the yield of ester. The commercial quality of the synthesised product is very similar to that of natural jojoba oil. Because of its low cost, this synthesis process is considered, from an economical point of view, very attractive.

ISSN:0008-4034    

DOI:10.1002/cjce.5450710323

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractStandard Gibbs free energy of formation (ΔGf0), an important property needed in design calculations has been estimated using molar refraction,RM. The linear relationships derived between ΔGf0andRMtested with the data on 8 series of hydrocarbons at 228 compounds yielded average deviations comparable to the methods cited in recent literature. The method can be used as an alternative to the existing ones, because of its simplicity combined with reasonable accurac

ISSN:0008-4034    

DOI:10.1002/cjce.5450710324

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450710326

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450710327

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450710329

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450710330

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450710301

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY