NCT-11型有机硫水解催化剂的研制

介绍了NCT－11型有机硫水解催化剂实验室研制情况。结果表明，在240～280℃时，该催化剂对气体中的COS有优越的水解性能。在280℃、1200h-1、进口COS—2000ｘ10-6　条件下，水解转化率＞90％。     

NCT-12型常温COS水解催化剂的研制及应用

介绍了NCT - 12型常温COS水解催化剂的实验室研制、工业扩试及工厂应用。在实验室考察了COS浓度及原料气空速对催化剂活性的影响 ,结果表明 ,在室温 ( 14～ 40℃ ) ,常压 ,COS入口浓度v(COS) 0 .15 % ,空速 10 0 0h-1的条件下 ,COS转化率 >95 %。工业扩试产品的性能符合质量指标 ,并略优于国内同类催化剂。工业应用情况良好     

QSJ-01常温COS水解催化剂的工业应用

介绍了 QSJ- 0 1常温 COS水解催化剂在甲醇装置原料气中 COS的脱除和应用后卸出催化剂分析测试结果。工业应用结果表明 :QSJ- 0 1催化剂具有良好的 COS转化活性 ,强度好 ,精脱后气体中 COS小于 0 .0 5×10 - 6 ,延长了甲醇催化剂的寿命 ,为工厂创造了明显效益。     

CO气源COS水解催化剂的工业侧流试验

介绍了CO气源中脱除高浓度COS水解催化剂的侧流试验情况,侧流试验结果表明,QSJ-01A型催化剂是一种适用于CO气源中高浓度COS的脱除、具有高水解转化率和抗氧毒性的优良催化剂,其最佳使用温度为60～150 ℃。     

8万t/a甲醇装置精脱硫与甲醇催化剂应用分析

介绍了EH-2中温耐硫水解催化剂和JTL-1常温精脱硫工艺在久泰公司8万t/a甲醇装置中的应用。生产运行表明,单炉甲醇催化剂已使用5年,生产强度达16 432t/m3甲醇催化剂,精脱硫系统后的总硫含量全部<0.1×10-6,确保了甲醇合成催化剂的稳定、长周期运行。     

化工信息

EH-1Q型常温氧硫化碳水解催化剂、EAC-1型活性炭精脱硫剂及常温精脱硫新工艺通过部级鉴定EH-1Q型常温氧硫化碳水解催化剂、EAC-1型活性炭精脱硫剂及常温精脱硫新工艺这一攻关课题,经     

EH-2中温耐硫水解催化剂的开发与单醇中的精脱硫工艺

简要介绍了EH-2型中温耐硫水解催化剂试验结果及由EH-2催化剂与常温精脱硫新工艺组合技术在单醇中的工业应用。     

精脱硫技术在久泰甲醇装置中的应用

EH-2中温耐硫水解催化剂和JTL—1常温精脱硫工艺在久泰80kt／a甲醇生产中应用,保护甲醇催化剂,甲醇催化剂已使用4年2个月。生产强度达14873t／m^3甲醇催化剂,均创国内最好记录,经济效益显著。     

特种氢化双酚A型环氧树脂合成研究

氢化双酚A和环氧氯丙烷在催化剂作用下开环反应生成了氯醇醚,而后加碱进行闭环反应,制备了低分子质量氢化双酚A型环氧树脂,再将其进一步与氢化双酚A等进行加聚反应,得到高分子质量环氧树脂。通过对产物的环氧值、力学性能和电性能的测试,研究了环氧氯丙烷用量、碱用量、环化反应温度、时间、溶剂及催化剂对合成反应的影响。结果表明,最佳反应条件为:环氧氯丙烷与醇羟基的物质的量比为3.0~3.5∶1,n(NaOH)∶n(醇羟基)=1∶1.1~1.2,环化反应温度25~30℃、时间4 h,甲苯为溶剂,催化剂为自制EH-10。所得氢化双酚A环氧树脂质量稳定,可替代进口。     

LS-901催化剂对有机硫的水解性能

研究Ti O2基LS-901催化剂在不同水解温度、水气体积比和空速条件下对有机硫水解性能的影响,考察催化剂的长周期稳定性能。结果表明,LS-901催化剂可用于粗煤气脱除COS的工艺过程,在水解温度260℃、空速3 000 h~(-1)和水气体积比1.0条件下,有机硫COS水解率达99.5%,结构稳定性良好。     

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.     

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.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.