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Determination and Calculation of Direct Coal Liquefaction Reaction Heat

Author: ZhaoYuan
Tutor: ZhuXiaoSu；LiWenBo
School: CCRI
Course: Chemical processes
Keywords: Direct coal liquefaction Heat of reaction Bond energy Enthalpy Indirect calculation
CLC: TQ529.1
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 0
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Abstract


Direct coal liquefaction reactor temperature control during operation , which is a very important part . Therefore , the direct coal liquefaction reaction heat is a very important parameter in the design of the reactor . There are many ways of calculation and determination of the heat of reaction , but most of the methods are more modest basis for comparison or conditions of reaction . Direct coal liquefaction reaction , which is more related to the reactants and products , the reaction is more complex , more demanding conditions . In such cases , some literature proposed departure from the heat balance method to calculate the direct coal liquefaction reaction heat . These methods are to establish the mathematical model , parameter estimation and numerical calculation , based on the principle of heat conservation , and has played a guiding role of the practical applications , but more equations and physical quantities involved , the calculation is more complicated and broad applicability is not strong . The main purpose of this paper is to seek an easy and to meet the requirements of engineering calculation methods . First, from the point of view of chemical bonds explained through qualitative analysis of direct coal liquefaction reaction exothermic reaction . Then, starting from the reaction of the whole story state , does not consider the overall reaction , the state function \And calculated according to the different methods of analysis of the feed material during the heating process will be divided into two types: the theoretical calculation and the actual calculation . Calculation process mainly use substances standard parameters such as : standard heat of combustion and the molar constant pressure heat capacity . Different according to the material and physical and chemical properties of the main use of the experimental method , the calculation method and the combination of experimental and computational methods to obtain the required parameters . Provide the material basis for parameter determination to obtain an intermediate product in the actual calculation take autoclave approximation analog preheater . And in the calculation of the process , considering the temperature , pressure , and chemical reaction enthalpy , ultimately derived theoretical heat of reaction -54.854 kJ/molH2 in ; the actual reaction heat -56.156 kJ/molH2 . Explain the theory of reaction and reaction mechanism releasing heat is less than the actual exothermic heat .

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CLC: > Industrial Technology > Chemical Industry > Coke chemical industry > Coal liquefaction > Direct liquefaction ( hydrogenation )
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