Papers by Keyword: Green Process

Abstract: An L-proline-catalyzed synthesis of amino thiazoles is described here. Amides and 2-mercapto thiazoles were used as the starting reagents. Various reaction conditions were screened, and the scope of various amides and 2-mercapto thiazoles has been examined. Most of the substrates gave high yields. Compared with traditional synthetic methods with transition metal as catalyst, this protocol uses organocatalyst L-proline. It will reduce environment pollution and save the synthetic cost.

Abstract: This paper presents an essential oil extraction process in accordance with sustainable development and environmental protection. The idea is to use vegetal plant after extraction as a source of energy for steam production and the condensation of steam containing essential oil is ensured by an air-cooled condenser. In this prospect, a biomass burner was designed and its efficiency was evaluated and compared to an electrical heating system. From the experiments it was found that biomass could supply the energy needed to produce steam for essential oil extraction process. The essential oil yield and composition are comparable to those obtained by a classical method using an electrical heating system and a water-cooled condenser. The industrial projection and innovation lays in the integration of renewable energy in existing mobile extraction units by using solid waste as a source of energy for steam production. The condensation of steam containing essential oil can be ensured by an air-cooled condenser with fans powered by photovoltaic solar energy. Possibilities of clean energy integration and water economy in such process unit are the major technological advance in this alternative approach for energy and water savings especially in agro-based industries.

Abstract: A green process to prepare the hydrophobic and transparent CNT-based surface was developed without using any toxic chemicals, solvents or gases. CNT brush (CNT-b) powder, which was prepared by the repeated CVD, was the main material to prepare the desired surface. An adhesive layer of ethyl cellulose (EC) was spin coated on the glass substrate, where EC formed a networked porous microstructure. A low concentration CNT-b suspension was obtained by sonication of the mixture of CNT-b powders, sodium dodecylbenzenesulfonate (SDBS) and deionized water. To obtain the stabilized CNT-b suspension, it was found that 40 min of sonication time and SDBS/CNT-b weight ratio being 0.1 were required. The target surface was then prepared by spin coating CNT-b suspension on the EC coated glass. The contact angle of the prepared surface was around 120o and the optical transmittance was around 93% for the visible light. Either increasing the number of spin coatings or increasing the concentration of CNT-b suspension could slightly increase the contact angle to around 130o but the optical transmittance significantly reduce to about 75%, leading to a semi-transparent sample.

Abstract: Quick-point grinding technology, suitable to be applied in automobile manufacturing, cemented carbide and ceramic material processing industry, was an advanced ultra-high-speed grinding technology. It is the integration of super-high speed grinding, CBN super-abrasive and CNC flexible manufacturing and so on. The characteristics of quick-point grinding were systematically illustrated. Applications of this technology to process hard-machining materials and shaft parts were also given in this paper. Some problems and solutions corresponding to quick-point grinding technology were presented finally.

Abstract: In the process of high-speed cutting Ni-base superalloy, some precarious factors such as environment media, cutter wear and so on have great influences on the processed surface roughness, and are not easy to control. According to the microscopic cutter wear and surface roughness generated in the experiments of using different media (such as: cold wind oil-mist, cold wind and normal temperature oil-mist) to cut the alloy, the influences of different media cutting conditions on cutter wear and the surface roughness of a workpiece in the high-speed cutting Ni-base superalloy are studied, and the rule to improve the quality of surface processing of Ni-base superalloy under the condition of the cold wind high-speed cutting is revealed.