The prepared catalyst of tungstophosphoric acid supported on SiO2 has shown high activity, good selectivity of producing linear alkylbenzene (LAB) and 2-phenyl isomer and sufficient catalytic stability. Kinetics of benzene alkylation with 1-dodecene over this catalyst was investigated in a fixed-bed reactor after eliminating the influence of internal and external transport. Rate models of formation of different isomers of LAB were derived based on some simplifying assumptions. Kinetic parameters were determined.

eration performance of n-butane selective oxidation to maleic anhydride over a VPO catalyst in fixed-bed reactors was investigated. A temperature-programmed oxidation experiment demonstrated that reoxidation sufficient to activate the catalyst could only be carried out at a temperature higher than that of butane oxidation step. A periodic operation scheme, simultaneous modulation of both composition and temperature, was proposed and examined in a fixed-bed microreactor filled with 0.6 g of crushed catalyst and in a tubular fixed-bed reactor packed with 30 g of catalyst. In both reactors, feed composition modulation enhanced selectivity to maleic anhydride, but the conversion of butane and the yield of maleic anhydride dropped. With a 1:0.4 cycle split and period of 4min, reoxidation of the catalyst at 530℃, and selective oxidation at 405℃, the yield of maleic anhydride by both composition and temperature modulation was improved by 11.4% over that obtained for operation under steady-state conditions with the same time-average flow of n-butane, which indicated that the higher reoxidation temperature was effective in improving reactor performance.

Vapor-liquid-equilibrium (VLE) at normal pressure for the system formed by n-heptane, benzene and N-methyl-pyrrolidone (NMP) are investigated. The results show that NMP is a good extractive solvent that reverses the volatility of the binary system of n-heptane + benzene. A UNIFAC model is selected and proved that the group interaction parameters are reliable. A modified extractive distillation (MED) process, in which a little of water is added to lower the boiling point of reboilers in aromatics recovery column, is proposed on the basis of the original extractive distillation (OED) process. The process simulation shows that the proposed process raises the yield ratio of benzene from 94.2% to 98.2%. Since the modification is not complicated, the MED process have a lasting value in industry.

Oxidation of vanadium pyrophosphate (VPO) to the orthophosphatewas investigated by temperature programmed oxidation (TPO) and by weight gain measurements in a TGA unit as a model for the re-oxidation of a catalyst in a two-bed process in the partial oxidation of butane to maleic anhydride (MA). It was demonstrated by FTIR observations that the weight gain corresponds to the VPO oxidation. The results of separate measurements of a catalyst alternatively exposed to oxygen and to a stream containing butane should also be applicable to a VPO catalyst employed in a two-bed process. The VPO oxidation measurements demonstrate that re-oxidation of a VPO catalyst in a two-bed process should be carried out at a higher temperature than the butane partial oxidation. When this is carried out, significant performance improvements in the two-bed process are observed.

Alkylation of isobutane and butene was carried out in a continuous unit using triethylamine ydrochloride-aluminium (Ⅲ) chloride ionic liquid as catalyst. The effects of additives of HCl and metal chlorides on the properties of ionic liquids for alkylation were investigated. Improvement of production distribution with high yields of C8 and selectivity of TMP under a mild reaction condition has been observed after addition of CuCl.