Papers by Keyword: Carbon Disulfide

Abstract: In this work, a series of modified coconut shell activated carbons (CSAC) catalysts were prepared by sol-gel method and used for catalytic hydrolysis of carbon disulfide (CS₂) at low-temperatures. The influences of reaction conditions such as: reaction temperature, O₂ concentration, relative humidity (RH), gas hourly space velocity (GHSV) and inlet concentration of CS₂ on catalytic hydrolysis activities were studied. When the reaction temperature was 60°C, this catalyst showed the best catalytic performance and no better effect occurs with the increase of temperature. CS₂ hydrolysis activities were decreased with increasing amounts of O₂. When the RH was 30%, the catalyst manifests the best activity. The catalytic hydrolysis activities were decreased with increased of GHSV from 5000~20000h^-1. In addition, when the inlet concentration of CS₂ increased from 10ppm to 100ppm, the catalytic hydrolysis activities could be decreased.

Abstract: The reactions of aniline with CO₂ and CS₂ were investigated in the presence of sublimed AlCl₃ under the mild conditions (room temperature and ambient atmosphere). Reasonable mechanism, electrophilic substitution of carbonium and nitronium, was also provided according to GC/MS analysis of the reaction products. The resulting N,N-diphenylurea (DPU, high selectivity of 92.5mol%) and N,N-diphenyl thiourea (DPTU, high yield and selectivity of 80.1mol% and 99.7mol%, respectively) were purified by recrystallizing from ethanol and identified by melting point, element analysis, GC/MS, FTIR, UV and ¹H NMR data.

Abstract: Mg-based hydrogen storage material was prepared by ball milling, and then the material was used to react with CS₂. The morphology and hydrogen desorption properties of the hydrogen storage material as well as the CS₂ hydrogenation product were analyzed. Results show that in situ hydrogenation and desulfurization of CS₂ happens with the MgH₂ in the hydrogen storage material as hydrogen donator and desulfurizer at 300 °C and ordinary pressure, and MgS, CH₄ and H₂S are generated from the reaction. There is a coupling relationship between dehydrogenation of the hydrogen storage material and hydrogenation of CS₂. The addition of nickel and molybdenum show negative effect on the sulfur fixation capability of the Mg-based hydrogen storage material though they could decrease the dehydrogenation temperature of the material.

Abstract: At present, the environmental risk has become science foundation and one of important basis of the environmental risk management and environmental decision-making. This paper based on the chemical properties of carbon disulfide including physical and chemical properties, toxicity, explosive harms characteristics are studied and puts forward some preventive measures.