Production of Calcium Carbide from Fine Biochars
Production of Calcium Carbide from Fine Biochars
复制标题
用精细生物炭生产电石
DOI：
10.1002/anie.201004169
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发表时间：
2010-01-01
影响因子：
16.6
通讯作者：
Wu, Weize
中科院分区：
文献类型：
--
作者：
Li, Guodong;Liu, Qingya;Wu, Weize
碳是地球上最丰富的能源和化学物质来源。大气中二氧化碳的光活化转化所产生的生物质，以及煤和石油等生物质化石都是富碳的来源。在大约一个世纪的石油重工业使用中，这种碳氢化合物来源已经枯竭到了人们普遍担心它在接下来的几十年里变得稀缺的地步。[1]生物碳，也被称为生物炭，可以通过热解从大量可持续供应的木质纤维生物质中很容易地生产出来。[2]它的形态通常很好，其特点是机械强度低，与煤基焦相比具有高活性的特点。使用生物炭生产高能效化学品的能力将在很大程度上减轻我们对不断减少的石油原料的依赖。在这里，我们展示了细粒生物炭与细粒CaO的反应，以生产CaC2，这是生产许多商品化学品的重要起始原料。这个过程提供了改变碳转化途径的可能性。CaC2是由反应3C+CaO+E1！CaC2+CO，其中e1是该过程所需的能量，在20008C以上时约为445.6 kJmol？1。[3]用水处理CaC2可以很容易地转化为乙炔：CaC2+2H2O！乙炔是一种无氧平台化学品，用于生产化学品，例如聚氯乙烯(PVC)、乙酸乙烯酯和1，4-丁二醇。在这个碳转化过程中，主要产物CaC2和C2H2很容易从其他组分中分离出来。目前的CaC2生产技术可以追溯到1892年，从那时起就没有太大的变化。它使用的是电弧炉，仅限于小规模
Carbon is the most abundant source of energy and chemicals on the earth. Biomass produced from photon-activated conversion of atmospheric CO2, and biomass fossils such as coal and petroleum are all carbon-rich sources. In around only one century of heavy industrial use of petroleum, this hydrocarbon source has already depleted to a point of a widespread concern over its scarcity in the decades to follow.[1] Biocarbon, also known as biochar, can be readily produced from a vast sustainable supply of lignocellulosic biomass through pyrolysis.[2] It is often in fine form and characterized by low mechanical strength and high activity in comparison to coal-derived chars. The ability to use biochar for the production of chemicals with high energy efficiency will largely alleviate our dependence on shrinking petroleum feedstock. Herein, we show reaction of fine biochars with fine CaO for the production of CaC2, an important starting material for production of many commodity chemicals. The process offers the potential to redirect the carbon conversion pathway.CaC2 is produced by the reaction 3C+ CaO+ E1! CaC2+ CO, where E1 is the energy required for the process, about 445.6 kJmolÀ1 at above 20008C.[3] CaC2 can be readily converted into acetylene by treatment with water: CaC2+ 2H2O! C2H2+ Ca (OH) 2. Acetylene is an oxygen-free platform chemical for production of chemicals, for example, polyvinylchloride (PVC), vinyl acetate, and 1, 4-butanediol. In this carbon conversion process, the main products CaC2 and then C2H2 are readily separated from other components. The current CaC2 production technology dates back to 1892 and has not changed much since then.[4, 5] It uses an electric arc furnace, which is limited only to small-scale