Catalysis for One‐step Synthesis of Dimethyl Ether from Hydrogenation of CO

In this paper, a new catalyst system Cu‐Mn‐(M)/γ‐Al₂O₃ was developed for the directly synthesis dimethyl ether (DME) from synthesis gas in a fixed‐bed reactor. The catalysts with different n (Cu) : n (Mn) ratios, several promoter M (M is one of Zn, Cr, W, Mo, Fe, Co or Ni) were prepared and tested. The results showed the catalysts have a high conversion of CO and a high DME selectivity. The DME yield in tail gas reached 46.0% (at 63.27% conversion of CO) at 2.0 MPa, 275°C, 1500 h^?1 with the Cu₂Mn₄Zn/γ‐Al₂O₃ catalyst.     

Synthesis of p‐tert‐Butyl‐calix[6] ‐biscrown‐3 via Intramolecular Ring‐closure of 1,4‐Bis (2‐(2‐chloroethoxy) ethoxy) ‐p‐tert‐butyl‐calix[6]arene

With a variation in reaction conditions, 1, 4‐bis (2‐(2‐chloroethoxy)ethoxy)‐calix[6]arene (3) and l,3,5‐tris(2‐(2‐chloroethoxy) ethoxy)‐calix [6] arene (4) or 4 and 4‐chloroethoxyethoxy‐calix[6]crown‐3 (5) were selectively synthesized from p‐tert‐butyl‐calix [6] arene and 2‐(2‐chloroethoxy)ethyltosylate. l,3–4,6‐p‐tert‐butylcalix[6]‐bis‐crown‐3 (6) with (u,u,u,d,d,d) conformation and 1,3–4,5‐p‐tert‐butylcalix[6]‐biscrown‐3 (7) with self‐anchored (u,u, u, u, u, d) conformation were synthesized through an intramolecularly ring‐closing condensation of 1, 4‐bis (2‐(2‐chloroethoxy)ethoxy)‐p‐tert‐butyl‐calix[6]arene (3) in 25% and 15% yield, respectively. Using 5 instead of 3, only 7 was obtained in 65% high yield. 6 and 7 show different complexation properties toward alkali metal and ammonium ions.     

Synthesis of (S,S)-1,5-bis(4-alkyl-5-hydroxy-2-oxo-3-azapentyl)-1,5-diazacyclooctane

Crown ether derivatives have been extensively developed to provide enhanced structural recognition of substrate alkyl-ammonium cations. In particular a number of investigations of complexation of chiral alkylammonium salts by chiral crown ethers have been reported. The enantioselectivity has been applied in the chromatographic resolution of amino acid perchlorates. In general the crown ethers used in these studies have been based upon derivatives of 2, 2′-dihydroxy-1, 1′-binaphthyl1 or deriv…     

裂解气中痕量杂质的测定

应用色谱-质谱联用仪（GC-MS）研究了裂解气中痕量NO、AsH3、COS、硫醇、硫醚、甲醇等杂质的分析方法,研究结果表明该法具有灵敏度高、选择性好的特点,可为裂解气的利用研究提供可靠的数据,经过改进后还有可能被乙烯和丙烯生产厂用作乙烯或丙烯中痕量杂质分析的常规方法。     

四溴双酚A双缩水甘油醚的合成研究

研究了四溴双酚A双缩水甘油醚的合成方法,探索了不同原料摩尔比、溶剂、反应温度、第一步反应中碱的用量以及第一步反应时间对反应的影响,并对产品进行了环氧当量的测定。     

固载杂多酸催化性能的研究

在气相体系中考察了固载于活性炭 (C)上的磷钨 (PW12 )、硅钨 (SiW12 )及磷钼 (PMo12 )杂多酸对异丙醇脱水反应的催化性能 .不加水时主要生成丙烯 ;加入适量的水有助于降低丙烯而提高异丙醚的选择性 ;催化活性除与酸性有关外 ,与杂多酸的特殊结构“假液相”模型密切相关     

新型聚醚聚氨酯/硬段模型化合物/高氯酸钠复合物的制备和表征

以聚醚聚氨酯和硬段模型化合物为聚合物基体,高氯酸钠为掺杂盐,合成了一系列新型的聚氨酯／硬段模型化合物／高氯酸钠复合物,利用FR－IR,DSC,AFM和复阻抗谱等表征手段对其形态和性能进行了基团和羰基都可与钠离子进行络合,温度变化可以导致不同程度的络合,在低盐浓度下,复合物的Tk随盐浓度的增加逐渐上升,而在一定的浓度之上,玻璃化转变温度又明显下降;通过调整盐的含量可以得到不同的表面形态。随着温度的升高,该体系的离子电导率显著增加。     

Cation-dependent pericyclic reactions of crown-containing photochromic compounds

The review is devoted to the photochromism of pericyclic reactions of crown-containing photochromic systems. The complex formation of photochromic crown ethers with metal cations has a substantial effect on both the spectral characteristics of molecules and occurrence of photochromic reactions. A possibility to create systems with photocontrolled complex-forming properties is an attractive feature of the novel systems.     

Method for determination of methyl tert-butyl ether in gasoline by gas chromatography

A simple method for the determination of methyl tert-butyl ether (MTBE) in gasoline has been developed. The separation of MTBE from other analytes was controlled by the use of gas chromatography–mass spectrometry in the full scan mode using the characteristic primary, secondary and tertiary ions m/z 73, 57 and 43. The sample mass spectrum did not show any superimposition of other analytes. The separation from the common gasoline component 2-methylpentane was sufficient for reliable quantitation. An application of the developed conditions using gas chromatography with flame ionization detection was performed by the analysis of regular, euro super, super premium unleaded and ‘Optimax’ gasoline from petrol stations in the area of Frankfurt/Main, Germany. Regular unleaded gasoline shows an average MTBE content of 0.4% (w/w), whereas the MTBE content in euro super gasoline varies between 0.4 and 4.2% (w/w). The blending of MTBE to super premium has increased from 8.2% (w/w) in 1998 to 9.8% (w/w) on average in 1999. The recently introduced gasoline ‘Optimax’ shows an average MTBE content of 11.9% (w/w). The presented method might also be used for the analysis of other ethers, such as ethyl tert-butyl ether, which requires the use of another internal standard.     

Molecular and Crystal Structure of 4-Amino-4'-Nitrodiphenyl Ether

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