A PROMISING LINE OF PREPARATION OF GRAINS SAFFLOWER FOR PROCESSING

In this paper, we propose a new scheme of a highly efficient line for preparing safflower grains for processing. The new after vortex separator is a vibroseparator for separating the products close in physical properties, grinding Machine with a duo-aspirator, a photoseparator and a device for moisture-thermal treatment. Advantages of the proposed line for preparation of safflower grain for processing are that an additional plant in front of the photocarerator of the grinding machine and duo-espirator allows the crest to separate and remove or refine the shell of the seed in the form of a shell layer for more efficient subsequent spectral point analysis, which determines the grain composition for the purpose of sorting it On the basis of chemical composition and color in the photo separator, and sequential placement after the stone separator of a vibro separator for separation of products close in physical properties, a grinding machine with a duo-aspirator, a photoseparator and a device for moisture-thermal treatment, provides an intensification of the technological process of efficient separation of safflower from impurities and its preparation for further processing and Due to the rational layout of equipment.A highly efficient photocell separator is also provided, the advantages of which are that the installation of a storage and vibrating feeder in relation to the slanting tray from the back side and the execution of a smooth curved transition to the vibrating feeder in the upper part of the pitcher allows improving the separation of grain products by reducing the amplitude of grain oscillations, Caused by a rebound from the surface of the tray during the loading of the sorted material from the vibrating feeder

Polysaccharide-Stabilized PdAg Nanocatalysts for Hydrogenation of 2-Hexyn-1-ol

We used a new one-pot green technique to prepare polysaccharide-based Pd and PdAg nanocatalysts. Catalysts were obtained using a sequentially supporting natural polymer (2-hydroxyethyl cellulose (HEC), chitosan (Chit), pectin (Pec)) and metals on zinc oxide. Nanocatalysts based on a polysaccharide were studied using various physicochemical methods (IR spectroscopy, transmission electron microscopy, X-ray powder diffraction, etc.). The catalyst characterization results indicated the complete adsorption of polysaccharides and metal ions onto the inorganic support (ZnO). We demonstrated the formation of polysaccharide-stabilized Pd nanoparticles with a size of ~2 nm. Metal nanoparticles were uniformly located on the surface of polysaccharide-modified zinc oxide. The synthesized catalysts were tested using liquid-phase hydrogenation of 2-hexyn-1-ol under mild conditions (0.1 MPa, 40 °C). Close conversion values of 2-hexyn1-ol were obtained for all the developed catalysts. The selectivity for cis-hexen-1-ol of the polysaccharide-based PdAg nanocatalysts varied as follows: PdAg-HEC/ZnO > PdAg-Pec/ZnO > PdAg-Chit/ZnO. A similar correlation was obtained in the presence of monometallic Pd-polysaccharide/ZnO catalysts. We determined the optimum reaction temperature and catalyst loading for PdAg catalysts modified using HEC and Chit (40 °C, 0.05 g)

Synthesis and Catalytic Activity in the Hydrogenation Reaction of Palladium-Doped Metal-Organic Frameworks Based on Oxo-Centered Zirconium Complexes

Metal-nanocluster-doped porous composite materials are attracting considerable research attention, due to their specific catalytic performance. Here we report a simple, cheap, and efficient strategy for the preparation of palladium hydrogenation catalysts based on metal-organic frameworks (MOFs). It has been shown that the synthesis of Pd/MOF results in the formation of palladium nanoparticles uniformly fixed on the surface. The composition and structure of the resulting composites were studied using elemental analysis, DSC, TGA, XRD, TEM, and IR spectroscopy. Pd nanoparticles with an average diameter of 8–12 nm were successfully confined in the UiO-type MOFs, and the obtained nanocomposites exhibited abundant porosity, high stability, and a large surface area. It has been shown that the resulting catalytic systems with high activity, selectivity, and stability reduce phenylacetylene and allyl alcohol to styrene and propanol, respectively, in liquid-phase hydrogenation reactions