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Chu Z.,Research Institute of Nanjing Chemical Industry Group
Shiyou Huagong/Petrochemical Technology | Year: 2012

The synthesis of p-phenylenediamine by the hydrogenation of p-nitroaniline on a Rainey nickel catalyst with water as the solvent was studied, which was a green process. The influences of reaction conditions, namely reaction pressure, reaction temperature, stirring speed, p-nitroaniline dosage and catalyst dosage on the catalytic hydrogenation were investigated. The results showed that under the optimum reaction conditions: water dosage 400 mL, p-nitroaniline dosage 175 g, Raney Ni catalyst dosage 5.0 g, stirring speed 1000 r/min, reaction temperature 50°C and reaction pressure 3.0 MPa, the conversion of p-nitroaniline, the yield and purity of p-nitroaniline could reach 100.0%, 98.9% and 100.0%(w), respectively. Both the solvent and the catalyst could be reused. The process is safe and environmentally friendly with low cost and low energy consumption. Source


Yin Y.,Research Institute of Nanjing Chemical Industry Group
Shiyou Huagong/Petrochemical Technology | Year: 2012

Methyl isobutyl ketone(MIBK) was prepared by the dehydrogenation of methyl isobutyl carbinol(MIBC) over a Cu-based catalyst. The effects of raw material composition, reaction temperature, LHSV and gas/liquid mole ratio on the dehydrogenation were investigated. The thermal stability of the catalyst was studied. The catalysts before and after the dehydrogenation were characterized by means of XRD and pore structure analyzer. The results show that under the optimum conditions of pressure 0.1 MPa, reaction temperature 190-230 °C, LHSV 1.00 h -1 and the total content of MIBK and MIBC more than 99%(w), the conversion of MIBC and selectivity to MIBK can reach more than 60% and more than 98%, respectively. When the dehydrogenation products were directly used as raw materials and after 4 cyclic dehydrogenation runs were conducted, the content of MIBK in the products could reach more than 98%(w). After the thermal treatment of the catalyst, the conversion of MIBC decreased by 11.5%, but the selectivity to MIBK was almost unchanged. The characterization results demonstrate that both the specific surface area and the pore volume of the catalysts drop but the crystalline size of the active content Cu 0 grow up after the dehydrogenation or overheat. Source


Liu B.,Sinopec | Zhu D.,Research Institute of Nanjing Chemical Industry Group
Petroleum Processing and Petrochemicals | Year: 2014

The industrial application of NCMA solvent for CO2removal in dry gas enrichment unit in Wuhan Co. SINOPEC was reviewed. The results show that the NCMA solvent can improve CO2 absorption performance compared with MDEA. At the same throughput of the unit, the recycling amine solution rate to the dry gas absorption tower is dropped from 33 t/h of MDEA to 14 t/h of NCMA solvent and the concentration of CO2 in the treated gas also decreased from 400 μL/L to less than 50 μL/L. Meanwhile, the H 2S loading of NCMA solvent and ability to remove mercaptan are higher than MDEA. Finally, the alkali consumption, electricity consumption and emissions of alkali waste of the process are all reduced by using NCMA solvent instead of MDEA. Source


Liu J.,Research Institute of Nanjing Chemical Industry Group
Xiandai Huagong/Modern Chemical Industry | Year: 2012

Antioxidant FR is prepared with strong acidic ion exchange resin as catalyst, aniline and acetone as raw materials. The influences of the types of catalysts, reaction time polycondensation, reaction temperature and water content in acetone are investigated. The optimal reaction conditions are shown as follows: type A2 acidic resin as condensation catalyst, 130°C of condensation temperature, 10 hours of condensation time, 90-100°C of polymerization temperature and 6 hours of polymerization time. The composition of the product is characterized by HPLC. The total content of dimer, trimer and tetramer in antioxidant FR is 83.18%. Source


Chu Z.,Research Institute of Nanjing Chemical Industry Group
Xiandai Huagong/Modern Chemical Industry | Year: 2012

p-Nitroaniline is prepared by aminolysising of p-nitrochlorobenzene. The effects of reaction temperature, the concentration of ammonia solution, reaction time and the times of recycling the mother solution on the aminolysising process are investigated. The results show that, this process discharges less waste water but produces high-purity p-nitrochlorobenzene without the purification step. The conversion of p-nitrochlorobenzene and the purity of the formed p-nitroaniline can reach 100% and 99.9%, respectively, under the following conditions: 31.5 g of p-nitrochlorobenzene, 300.0 mL of 35% ammonia solution, 170.0°C of reaction temperature and 8.0 hours of reaction time. The yield of p-nitroaniline is 97.7%. The mother solution can be recycled for five times. Source

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