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Hydrogenation and Liquefaction of Waste Plastics through Partical Oxidation and Water Gas Shift Reaction in Supercritical Water

超临界水中粒子氧化和水煤气变换反应废塑料加氢液化

基本信息

批准号：
10555270
负责人：
ADSCHIRI Tadafumi
金额：
$ 8.51万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

We have developed a hydrogenation process of waste plastics through partial oxidation and water gas shift reaction in supercritical water. In this research, for the development of the process, we conducted the basic study of the key reactions, namely 1) pyrolysis of hydrocarbon, 2) partial oxidation of hydrocarbon, and 3) hydrogenation through partial oxidation and water gas shift (WGS) reaction in supercritical water. The results are as follows.1) Measurement of phase equilibria of hydrocarbon - supercritical water systemWe have developed the new equipment (vibrational density measurement apparatus for high temperature and pressure) to measure the phase equilibria of hydrocarbon - supercritical water system.2) Pyrolysis of hydrocarbon in supercritical waterPolyethylene pyrolysis experiments were conducted by using batch reactors. The results showed that l-alkane/alkene ratio increased and product distribution shifted toward shorter chain hydrocarbons with increasing water density. Thi … More s result can be explained by considering change of the reaction phase with water density.3) Study on hydrogenation of hydrocarbons through partial oxidation in supercritical water.The experiments of partial oxidation of n-hexadecane in supercritical water were conducted by batch reactors. In the results, the selectivities of CO and n-alkane formation were enhanced with increasing water density. The increase in n-alkane selectivity indicates that the produced CO reacted with water to produce H2 followed by the hydrogenation of l-alkane to n-alkane.We also conducted the experiments of partial oxidation of CH4 in supercritical water using a flow apparatus. The selectivity of CO increased with increasing water density. We applied a radical network model, which is commonly used for the gas-phase oxidation of CH4, for describing the partial oxidation of CH4 in supercritical water. Modifying the elementary reactions of forming H2O2 with considering the water density effect, we could described the reaction rate and the product distribution of the partial oxidation of CH4 in supercritical water by model.4) Designs of a continuous processWe made a feasibility study for a continuous process of partial oxidation of hydrocarbon based on the above experimental results. The results suggest that a) the feed concentration of hydrocarbon should be higher than 10%, b) oxygen concentration should be around 15%, and c) liquid phase feeding of oxygen is preferable.The above results suggest that catalytic hydrogenation through partial oxidation and water gas shift reaction in supercritical water have a high potential for hydrogenation of hydrocarbons. Less

采用超临界水部分氧化-水煤气变换法对废塑料进行加氢处理。在本研究中，为了开发该工艺，我们对关键反应进行了基础研究，即1）烃的热解，2）烃的部分氧化，3）在超临界水中通过部分氧化和水煤气变换（WGS）反应的加氢。主要研究结果如下：1）烃类-超临界水体系相平衡的测定我们研制了一套新的烃类-超临界水体系相平衡测定装置（高温高压振动密度测定仪）。2）烃类在超临界水中的热解利用间歇式反应器进行了聚乙烯的热解实验。结果表明，随着水密度的增加，直链烷烃/烯烃比增加，产物分布向短链烃方向移动。Thi ...更多信息 3）烃类在超临界水中部分氧化加氢的研究在间歇式反应器中进行了正十六烷在超临界水中部分氧化加氢的实验研究。结果表明，随着水密度的增加，CO和正构烷烃生成的选择性增加。正构烷烃选择性的提高表明生成的CO与水反应生成H_2，然后将正构烷烃加氢为正构烷烃。CO的选择性随水密度的增加而增加。我们采用自由基网络模型，这是通常用于气相氧化的甲烷，描述的部分氧化的甲烷在超临界水中。对生成H_2O_2的基元反应进行修正，考虑水密度效应，用模型描述了超临界水中甲烷部分氧化的反应速率和产物分布。4）连续过程的设计在上述实验结果的基础上，对烃类部分氧化的连续过程进行了可行性研究。结果表明，烃类原料浓度应大于10%，氧气浓度B应控制在15%左右，氧气宜采用液相进料，说明部分氧化催化加氢和超临界水水煤气变换反应具有很大的潜力。少