Pyrolysis of vulcanized styrene-butadiene rubber via ReaxFF molecular dynamics simulation

Styrene-butadiene rubber (SBR) is widely used in tires in the automotive segment and vulcanization using sulfur is a common process to enhance its mechanical properties. However, the addition of sulfur as the cross-linking agent usually results in impurities in pyrolysis products during rubber recycling, and thus the desulfurization during tire pyrolysis attracts much attention. In this work, the pyrolysis of vulcanized SBR is studied in detail with the help of ReaxFF molecular dynamics simulation. A series of crosslinked SBR models were built with different sulfur contents and densities. The following ReaxFF MD simulations were performed to show products distributions at different pyrolysis conditions. The simulation results show that sulfur products distribution is mainly controlled by sulfur contents and temperatures. The reaction mechanism is proposed based on the analysis of sulfur products conversion pathway, where most sulfur atoms are bonded with hydrocarbon radicals and the rest transfer to H₂S. High sulfur contents tend to the formation of elemental sulfur intermediate, and temperature increase facilitates the release of H₂S.     

油箱壁板裂纹分析

两批油箱壁板在加工完成后,放置一段时间后出现裂纹.通过对故障油箱壁板的裂纹宏观观察、断口的宏微观观察以及裂纹金相分析和材料的性能测试,对壁板裂纹的性质与原因进行了分析.结果表明,两批油箱壁板裂纹的性质均为应力腐蚀开裂,壁板上应力腐蚀裂纹的产生与壁板材料的热处理状态、壁板加工后较高的残余应力以及存放环境中的腐蚀介质有关.     

DZG-10焦化汽油加氢精制催化剂的开发和工业应用

介绍了DZG-10焦化汽油加氢精制催化剂的开发过程和工业应用。通过对载体的改性，提高了大孔所占比例,将催化剂外形改为齿球形，增大了催化剂的外表面积，提高了催化剂的活性和机械强度。从连续平稳运转26个月情况来看，催化剂床层压差较低，说明催化剂床层结垢、结焦和催化剂破损情况不明显。开发的DZG-10催化剂是一种优良的纯焦化汽油加氢精制催化剂，具有较好的应用前景。     

Synthesis of nano Sb-encapsulated pyrolytic polyacrylonitrile composite for anode material in lithium secondary batteries

A novel process was proposed to synthesize nano Sb-encapsulated pyrolytic polyacrylonitrile composite for anode material in lithium secondary batteries. The preparation started with the dissolution of SbCl₃ and polyacrylonitrile (PAN) in dimethylformamide (DMF) solution, followed by the addition of KBH₄ to reduce Sb³⁺ in the solution. The Sb composite was obtained by pyrolysis of the Sb/PAN mixture that precipitated out when the DMF solution was added by plentiful water. The TEM analysis showed that about 100-200 nm Sb particles were embedded by the pyrolyzed PAN, which provided a conductive matrix to relieve the morphological change of Sb during electrochemical cycling. As-prepared composite presented good cycleability for lithium storage. The proposed process paves an effective way to prepare high performance alloy based composite anode materials for high performance lithium-ion batteries.     

多维气相色谱法测定清洁汽油中的含氧化合物

研究了多维气相色谱分析技术检测含有内标物MTBE（甲基叔丁基醚）汽油中含氧化合物（醇类和醚类）的方法。通过实验，考察了分流比、阀切换时间等因素对实验结果的影响，确定了最佳实验条件；同时对该方法的准确度和精密度进行验证，结果表明，该方法具有很好的精密度，加标回收率在90％-102％之间，样品分析周期为20min。由此可见，采用多维气相色谱分析技术，可以快速、准确地测定清洁汽油中的含氧化合物。     

FCC汽油降烯烃技术进展

介绍了近年来国内外FCC汽油降烯烃的技术进展，并对FCC汽油降烯技术及相关措施的未来应用前景进行了分析。     

加入WTO我国成品油行业的对策及措施

分析了我国成品油行业现状和加入WTO带来的影响，以有国内该行业的竞争力水平。为应对加和WTO以后的新形势，研究了我国成品油行业在生产和销售领域需要采取的措施，并向政府提出了在加强宏观管理、营造公平合理的竞争环境方面的几点建议。     

催化裂化汽油氧化脱硫技术研究进展

介绍了近年来以轻质油品为研究对象，采用在多金属氧酸盐或有机酸等催化剂存在下，氧化脱除油品中含硫化合物的研究，如Petro Star公司的CED技术、日本(PEG)过氧化氢氧化法、有机酸催化氧化法、超声波氧化法、金属离子催化氧化法、多金属氧酸盐催化氧化法等，分析各自不同的优势和局限性，更适应的汽油氧化脱硫体系仍有待进一步的探索。     

OCT-M技术生产清洁汽油的工业应用

石家庄炼油化工股份有限公司60万t/a OCT-M FCC汽油选择性加氢脱硫装置2005年3月首次开工,开工初期硫醇偏高,辛烷值损失较多.根据抚顺石油化工研究院的建议,优化了OCT-M装置的催化剂装填方案和操作工艺条件.2005年11月,在装置累计运转6个月之后,对OCT-M装置进行了满负荷标定,标定结果表明硫含量由606～676 μg/g降低到114～180 μg/g,RON损失0.4～0.6个单位.2006年11月,在装置累计运转17个月之后,对OCT-M装置又进行了一次标定,标定结果表明MIP汽油硫含量由417～442 μg/g降低到24～53 μg/g,RON损失0.7～1.8个单位,标定结果表明OCT-M技术可为我国炼厂生产硫含量≯150 μg/g)和硫含量≯50 μg/g的清洁汽油提供经济、灵活的技术方案.