扬子乙烯装置改造项目启动

被列为国家首批财政贴息技改工程的扬子65万t乙烯技改工程已开始启动。扬子石化新增乙烯裂解炉软件合同于前不久在北京签字。这标志着扬子石化新一轮改造已进入实施阶段。扬子乙烯装置改造工程预计于2002年竣工投产,建成后将新增商品     

扬子石化乙烯装置改造工程启动

国家首批财政贴息技术改造工程,总投资约45亿元的扬子石化有限责任公司年产65万ｔ乙烯改造工程开始启动,新增乙烯裂解炉软件合同日前在北京签字。这标志着扬子石化公司新一轮改造已进入实施阶段,整个改造工程将于2002年建成投产。改造工程包括新增4台10万ｔ级乙烯裂解炉,...     

扬子石化公司65万t/a乙烯改造工程开始启动

根据我国石油化工发展战略 ,“九五”期间 ,我国石油化工发展主要是靠对现有企业进行技术改造 ,走内涵式发展道路。扬子石化公司 6 5万ｔ/ａ乙烯改造工程就是其中之一。目前 ,扬子石化公司 6 5万ｔ/ａ乙烯改扩工程开始启动 ,新增乙烯裂解炉软件合同于 1 999年 1 1月2 3日在北京签字。这标志着扬子石化公司新一轮技术改造已进入实施阶段。扬子石化公司 6 5万ｔ/ａ乙烯改造工程被列为国家首批贴息技改工程。乙烯改造工程包括 :新增 4台 1 0万ｔ/ａ乙烯裂解炉 ,使乙烯产能由 4 0万ｔ/ａ增加到 6 5万ｔ/ａ,乙烯裂解炉技术是由中国石化集团公司和…     

化工原料

扬子石化65万t/a乙烯改造工程全面建成 享受国家财政贴息支持的国家重点技改项目、投资43.5亿元的扬子石化65万t/a乙烯改造工程的最后1套化工生产装置—乙烯装置实现中间交接,选标志着扬子石化新一轮改造已经全面完工,预计10月前打通全流程。新装置的建成,将扩大扬子石化的产品规模,改善产品结构,壮大竞争实力,也为我国经济的进一步发展提供更多的基础原料支持。     

扬子百万吨塑料供应基地初具规模

扬子石化65万吨乙烯改造工程的最后一套终端产品装置——20万吨/年聚乙烯装置日前一次开车成功,并产出了晶莹剔透的高品质塑料产品。 至此,扬子石化第二轮乙烯改造工程新建丁二烯、聚丙烯和聚乙烯所有三套终端产品装置全     

扬子乙烯改扩建工程的内容及考核

叙述了扬子乙烯改扩建工程改造的方案及其改造后投料试车与考核试验的情况。     

扬子石化乙烯改造项目通过环保评估

扬子石化65万吨/年乙烯改造项目最近通过国家环保总局等方面专家的环境评估,从而为扬子新一轮改造发出了第一张“绿色通行证”.     

扬子石化增加聚乙烯生产能力

扬子石化去年完成的65万吨乙烯改造,使该公司聚乙烯年生产能力达到了40万吨。为使乙烯改造后的效益得到充分发挥,该公司于6月18日开工建设聚     

扬子石化烯烃厂将打造中国石化最佳烯烃工厂

近期扬子石化烯烃厂紧紧抓住国家调整和振兴石化产业的时机，加快推进三轮乙烯改造、18万吨环氧改造、1#乙烯节能改造等项目的实施进度．通过硬实力和软实力的提高来保持并增强企业的核心竞争力，全力打造“中国石化最佳烯烃工厂”。     

扬子公司650 kt/a乙烯改造工程通过竣工验收

扬子石油化工股份有限公司(简称扬子石化)650kt／a乙烯改造工程经过2年多的试生产．于2004年12月17日通过了中国石化集团公司和江苏省南京市有关部门组织的竣工验收。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

基于ATRP法制备的触角状亲水性羟胺树脂的吸硼性能的研究

以大分子引发剂氯乙酰化聚苯乙烯微球(PS-acyl-Cl)经原子转移自由基聚合(ATRP)法引发丙烯酰胺(AM)和甲基丙烯酸缩水甘油酯(GMA)单体的共聚接枝,制得一种触角状亲水性环氧载体(PS-acyl-g-P(AM-co-GMA)),再经二乙醇胺(DEA)的环氧基开环胺化反应,得到一种含多个-NCH2CH2OH螯合配基的多齿-五元螯合环的触角状亲水性羟胺树脂(PS-acyl-g-P(AM-co-GMA)-DEA)。将此树脂用于硼吸附研究,结果表明,PS-acyl-g-P(AM-co-GMA)-DEA树脂对硼的吸附满足Langmuir方程,为单分子层吸附;饱和吸附量约为37.7 mg·g-1,且树脂5 min即可达到吸附平衡,与其它已报道的吸硼树脂相比,该树脂具有更高的吸附量和吸硼速率。吸附动力学研究表明,树脂吸附硼的过程主要由颗粒扩散过程控制。重复使用5次后该树脂的吸附量基本不变,解吸率均在90%以上,重复使用性能良好。