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Enthalpy and Heat of Reaction02:12

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Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
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Environmental Applications of Microorganisms01:30

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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Calculating Standard Free Energy Changes02:49

Calculating Standard Free Energy Changes

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The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
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Thermochemical Equations

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For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the enthalpy of reaction (also called the heat of reaction, ΔHrxn) is equal to the heat exchanged with the surroundings (qp).
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Energy Basics02:27

Energy Basics

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Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter.
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Free Energy01:21

Free Energy

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Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
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Updated: Jun 5, 2025

Fast Pyrolysis of Biomass Residues in a Twin-screw Mixing Reactor
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燃烧与气化在电力和生物质到X过程中的相比:一个外观分析分析.

Simone Mucci1,2, Alexander Mitsos3,1,4, Dominik Bongartz2,5

  • 1Process Systems Engineering (AVT.SVT), RWTH Aachen University, 52074 Aachen, Germany.

ACS omega
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PubMed
概括

生物混合动力和生物质到X过程为化学品和燃料提供了可持续的途径. 与燃烧相比,生物质气化途径显示出更高的能量效率,突出显示了热力学优势.

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科学领域:

  • 化学工程是化学工程的重要组成部分.
  • 可再生能源系统可再生能源系统
  • 热力学是一种热力学.

背景情况:

  • 剩余生物质是一种有价值的碳原料,具有固有的能量含量,用于生产化学品和燃料.
  • 生物混合或动力和生物质到X的过程将生物质转化与基于电力的途径相结合.

研究的目的:

  • 研究生物质在电力和生物质到X过程中的利用.
  • 为了确定生物质燃烧和气化途径之间的效率差异.

主要方法:

  • 使用质量和能量平衡对工艺单位进行建模.
  • 对甲,甲醇,二甲基乙烯和二甲生产途径的实践分析.
  • 包括实用因素在内的电力和生物质转化为甲醇过程的详细建模.

主要成果:

  • 使用生物质气化的动力和生物质到X工艺显示出显著更高的能量效率 (约. 15-20个百分点). 这是一个很好的方法.
  • 与燃烧相比,气化路径在水电解中表现出较低的能量损失,并且气化单元本身的效率更高.
  • 基于气化路线的热力学优势甚至在考虑诸如副作用和不完全转换等实际因素时也得到证实.

结论:

  • 生物质气化是生物混合动力和生物质到X过程的首选途径,因为它具有优越的热力学效率.
  • 基于气化的路线提供了一种更有效的方法,用于从剩余生物质中生产基于电力的有机化学品和燃料.