权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of PCB Cracking Method by Plasma Heating with Acetylene and without Dioxin Generations

无二恶英生成的乙炔等离子加热PCB裂解方法的开发

基本信息

批准号：
11450284
负责人：
SHIMPO Ryokichi
金额：
$ 9.98万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450284/
关键词：
Dioxin PCB Acetylene Plasma Processing Equilibrium Calculation

项目摘要

As a process for cracking PCB with acetylene generation, a new method using hybrid plasma heating followed by gas filter assemblies for cleaning the generated gas has been presented in this research. Equilibrium calculations were conducted for the simulation of both the reaction systems in plasma heating condition and in the heating condition performed by normal electric furnaces, the latter of which is supposing the heating of the filter for burning out the substances caught at the filter. For the equilibrium calculation, a version of GOTO methods has been employed which was developed by this researchers' group. According the results of the simulations, it became obvious that about 90% of PCB can be cracked to be acetylene heated in the temperature range from 1500℃ to 2500℃. The similar conversion ratio is prospected when kerosene is mixed to PCB as a solvent. It has also turned out that the decomposition temperature of dioxin is much dependent on the oxygen ratio in the system at the temperature range given by normal electric furnaces. In order to confirm the formation and decomposition of dioxin experimentally, chlorobenzene was heated with small amount of oxygen in the temperature range lower than 800℃ in a reaction tube of a electric furnace. When the temperature of the furnace was lower than 600℃, few substances reacted were found by the analysis using gas chromatography mass spectrometer. However, a large number of organic substances having benzene ring were found when heated at 700℃ and 800℃. A dibenzofuran, which belongs to the dioxin family and toxic, has been detected when heated with metallic copper as catalyst, though dioxin itself has not been detected yet.

作为一种裂解PCB的乙炔发生工艺，本研究提出了一种新的方法，使用混合等离子体加热，然后使用气体过滤器组件来清洁所产生的气体。对等离子体加热条件下的反应体系和普通电炉加热条件下的反应体系进行了平衡计算，后者假设加热过滤器以烧掉过滤器中捕获的物质。对于平衡计算，采用了本研究小组开发的一种版本的后藤方法。模拟结果表明，在1500 ~ 2500℃的温度范围内，90%左右的PCB可以被乙炔裂解。当煤油作为溶剂与PCB混合时，预期类似的转化率。还发现，在普通电炉给定的温度范围内，二恶英的分解温度在很大程度上取决于系统中的氧比。为了从实验上证实二恶英的生成和分解，在低于800℃的温度范围内，在电炉的反应管中，用少量氧气加热氯苯。当炉膛温度低于600℃时，用气相色谱质谱仪分析，发现反应物很少。但在700℃和800℃加热时，发现了大量含苯环的有机物。虽然二恶英本身尚未被检测到，但当用金属铜作为催化剂加热时，已检测到属于二恶英家族且有毒的二苯并呋喃。