ESTIMATION OF ACTIVATED ENERGY OF DESORPTION OF n—HEXANE ON ACTIVATED CARBONS BY PTD TECHNIQUE

In this paper,six kinds of activated carbons such as Ag^+-activated carbon,Cu^2+activated carbon,Fe^3+-activated carbon,activated carbon,Ba^2+-activated carbon and Ca^2+activated carbon were prepared.The model for estimating activated energy of desorption was established.Temperature-programmed desorption(TPD)experiments were conducted to measure the TPD curves of n-hexanol and then estimate the activation energy for desorption of n-hexanol on the activated carbons.Results showed that the activation energy for the desorption of n-hexanol on the Ag^+-activated carbon,the Cu^2+-activated carbon and the Fe^3+-activated carbon were higher than those of n-hexanol on the activated carbon,the Ca^2+-activated carbon and the Ba^2+-activated carbon.     

CRYSTAL STRUCTURES OF ISOMERS OF DIHYDROXYDIBENZO—14—CROWN—4

<正> C18H18O6·H2O, Mr = 348. 34, cis-isomer: orthorhombic, Cmc21, a = 16. 421(3), 6 = 11.978(1), c=8. 624(1)(?), V = 1696. 2(?)3, Z = 4, Dc= 1.293 gcm-3, λ(MoKα) = 0. 71073(?), μ = 0. 911cm-1, F (000) = 763, R = 0. 043, Rw = 0. 042 for 769 unique observed reflections. trans-Isomer : orthorhombic, Cmc21, a = 16. 503(2), b = 12. 297(2), c=8. 557(3) (?). V = 1736(?)3, Z = 4, Dc= 1.271 gem-3, λ(MoKα) = 0. 71073(?), μ = 0. 892cm-1, F (000) = 736, R=0.048, Rw = 0. 046 for 551 unique observed reflections. The configurations of the two molecules appear as butterflies. There is a Cm symmetry in the molecule of each isomer.     

TREATMENT OF WASTEWATER FROM PRODUCTION PROCESS OF 2，3—ACID

Wastewater from production process of 2,3-acid was treated by adsorption using macroporous resin NDA-708.After only one-step treatment by resin adsorption,removal efficiency of three kinds of naphthalene chemicals was above 99%;removal eficiency of CODcr was above 96%.Under proper operating condition,desorptionefficiency was around 100%.The running records of the industrial facility showed that the naphthlene chemicals in desorption effluent could be reused without obvious influence on the quality of the product.     

STRUCTURE OF 1，2，4—TRIPHENYLCYCLOPENTA—1，3—DIENE

<正> C23H18, Mr = 294. 40, orthorhombic, Pbca, a = 20. 927(9), b = 20. 695(9), c = 7. 570(2)(?), V = 3278(2)(?)3, Z = 8, Dc=1.19gcm-3, μ(MoKα) = 0. 63cm-1, F(000) = 1248, R = 0. 057 for 1109 observed reflections with I>2. 5* (I). The dihedral angles between a given phenyl ring and the cyclopentadienyl plane are 28. 2, 50. 2 and 21. 8°, respectively. The structure is stabilized through weak stacking of the cyclopentadiene moieties in crystals.     

PREPARATION OF POLYMER—SUPPORTED RCpCpTiCl2 AND APPLICATION IN CATALYTIC ISOMERIZATION OF 1,5—HEXADIENE

Polymer-supported RCpCpTiCl2(Cp=η^5-C5H4;RCp=η^5-RC5H4)have been prepared and reduced by i-C3H7MgBr in situ，then used in catalytic isomerization of 1,5-hexadiene.The isomerization of 1,5-hexadiene leads to a mixture of cyclic and linear products.The ratio of cyclic to linear product depends on the nature of the supporter and the substituent on the cyclopentadienyl ring.The former contributes the most,for example,silica supported Cp2 TiCl2 gave cyclic-linear ratio of 99/1,while for polymer-supported Cp2TiCl2 species,linear compounds are the major products and the ratio of cyclic to linear product changes with different R groups on the cyclopentadienyl ring.