Determination of heavy metals and volatile aromatic compounds in used engine oils and sludges

Assessment of contaminant releases during utilization of used oils is essential for the determination of environmental acceptability. These paper reports the results of the study examining a toxic metal leachability from used engine oil and sludge samples employing leaching test (TCLP). The leaching test indicated that lead in oil samples exceeded 5-ppm concentration level what qualified them as a toxic waste. The samples of contaminated sludge were found to contain high concentration of total lead, barium and chromium, but the leaching test showed concentration below regulatory limit. The total content of benzene, ethylbenzene, toluene, and xylenes (BETX), and naphthalene in used oil and sludge samples was also determined and was found not to be a significant factor to contamination.     

废塑料配煤炼焦的小焦炉试验

废塑料经分类、筛选和制粒后，用小焦炉进行配煤炼焦试验，结果表明，对焦炭强度的影响不大，还可增加炼焦化学产品的产率，但废塑料的配比宜控制在2％以下。     

Conversion of used vegetable oils to liquid fuels and chemicals over HZSM-5, sulfated zirconia and hybrid catalysts

Thailand’s food manufacturing uses about 47 Million liters per year of vegetable oil. Used vegetable oil is classified as waste, but has potential for conversion into liquid fuel. This research studied the catalytic conversion of used vegetable oil to liquid fuel, where investigation was performed in a batch microreactor over a temperature range of 380–430 °C, initial pressure of hydrogen gas over 10–20 bars, and reaction time of 45–90 minutes. Catalysts such as HZSM-5, Sulfated Zirconia and hybrid of HZSM-5 with Sulfated Zirconia were used to determine the conversion and yield of gasoline fraction. The major products obtained were liquid products, hydrocarbon gases and small amounts of solids. Liquid products were analyzed by simulated distillation gas chromatograph and the product distribution was obtained. Hybrid catalyst HZSM-5 with Sulfated Zirconia showed the highest yield of gasoline with a 26.57 wt% at a temperature of 430 °C, initial hydrogen pressure at 10 bars, and reaction time of 90 minutes in the ratio of hybrid HZSM-5 with Sulfated Zirconia at 0.3: 0.7.     

Hydrogen production from used lubricating oils

Used lubricating oils (lube oils) are generated throughout the year and collected in central locations in many communities. Disposing lube oil in an improper manner contaminates environment to a great degree. Used lube oil can be valuable as a re-refined lubricant or as an energy source. Lube oil is a complex mixture of aliphatic and polycyclic hydrocarbons formulated to withstand high service temperatures in internal combustion engines. Both synthetic and mineral oils contain a high concentration of hydrogen (about 13–14 wt%). At the Florida Solar Energy Center, we have developed a process that converts lube oils to hydrogen and other valuable low molecular weight hydrocarbons. The lube oil reformation experiments were carried out using several commercially available dehydrogenation catalysts at a range of reactor temperatures and pressures, residence times and steam to carbon ratios. In this paper, the data obtained to date and the results are presented and discussed.     

基于PLC及MCGS组态软件的海水源热泵空调控制系统

本文作者结合我国首个以海水为能源的空调系统，利用可编程控制器（PLC）和MCGS组态软件完成了对系统的电气控制的设计，并且在实际的应用中取得了很好的效果。     

浅论铝用预焙阳极高温混捏成型新技术

本文系统阐述了铝用预焙阳极高温混涅成型新技术的产生背景、工艺技术路线研究及应用探讨,并结合相关数据论述了该新技术的成功运用。     

养老保险基金管理中需加强的几个问题

养老保险基金工作是建立健全社会保障体系，发展市场经济、维护社会稳定的需要。因此，党中央、国务院高度重视养老保险基金的管理工作，文章从六个方面论述了养老保险基金管理中应需加强的问题。     

对废塑料配煤炼焦产品产率的研究

通过在炼焦煤中添加不同种类、不同比例的废塑料，研究了所得焦炭的性质和焦化产品产率的变化。实验结果表明，焦油和焦炭的产率随着废塑料添加比例的增加而增大，粗苯和氨等产率变化不明显。     

日本京滨临海工业区建设发展实践及启示

京滨临海工业区是日本临海工业建设起步最早的区域,创建于明治后期,经历百余年发展,已成为日本最成熟的临海工业区之一,其发展过程亦是日本临海工业区发展的缩影。文章回顾了京滨临海工业区的发展建设历程,并评述其发展经验与教训,以期对我国临海工业区建设起到一定的启示。