4results about How to "Increase molecular size" patented technology

This invention provides a method and system for producing needle coke from ethylene tar. The method includes the following steps: (1) ethylene tar feedstock is mixed with hydrogen-containing gas and then enters a hydrogenation reaction zone, where it is reacted sequentially with at least two hydrogenation catalyst beds; (2) the reaction effluent obtained in step (1) is separated into gaseous and liquid phase products; (3) the liquid phase product obtained in step (2) enters a coking unit, and the oil and gas generated in the reaction are separated to obtain gas, light component oil, middle distillate oil, and heavy distillate oil. After the reaction cycle is completed, the final needle coke product is obtained. In the hydrogenation reaction zone mentioned in step (1), compared with the hydrogenation catalyst in the adjacent upstream hydrogenation catalyst bed, the proportion of mesopores >30nm in the downstream hydrogenation catalyst bed is reduced, and the proportion of mesopores <5nm in the upstream hydrogenation catalyst bed is increased. The method can suppress the formation of coking precursors and produce high-quality needle coke products.

The application belongs to the technical field of bamboo processing, and particularly relates to a preparation method of improved reconstituted bamboo, wherein the defibrated bamboo bundle is stepwise impregnated by preparing etherified melamine formaldehyde resin and modified phenolic resin. First, the bamboo bundle is impregnated by the etherified melamine formaldehyde resin with small molecular size, low viscosity and good water solubility, so that the etherified melamine formaldehyde resin can deeply enter the cell wall and the inner part of the micropore of the bamboo, fully fill the pores and block the hydrophilic channels, and meanwhile, the mildewproof agent is uniformly delivered to the inner part of the bamboo. Further, the bamboo bundle is impregnated by the phenolic resin with large molecular size and modified by flexible sugar ring units, so that the phenolic resin can be enriched on the surface of the bamboo bundle and the bonding interface, a flexible bonding layer is formed, the flexible molecular chain can buffer the residual stress of the interface, the bonding layer flexibility and the bonding strength of the bamboo bundle are improved, and the structural stability of the reconstituted bamboo during long-term use is further ensured.

The invention belongs to the field of gene engineering, and relates to preparation and application of a recombinant human (THP) 2-mFc fusion protein. The recombinant human (THP) 2-mFc fusion protein is a plasmid pCGS3-GS-(THP) 2-mFc, wherein the plasmid pCGS3-GS-(THP) 2-mFc is formed by fusing a tumor targeting peptide sequence THP and an mFc structural domain of human IgG1 by using a genetic engineering technology. The plasmid is transfected into a CHOZN cell, a stably transfected monoclonal cell strain CHOZN-(THP) 2-mFc is obtained through screening, and the THP 2-mFc fusion protein is prepared through expression and purification of the stably transfected monoclonal cell strain CHOZN-(THP) 2-mFc. A series of in-vitro experiments prove that the (THP) 2-mFc fusion protein disclosed by the invention has the effects of targeted recognition and tumor cell killing, has an obvious anti-tumor effect and has a relatively good application prospect.

This invention discloses a selective hydrogenation catalyst, its preparation method, and its applications. The selective hydrogenation catalyst of this invention comprises a support, an active component, and an auxiliary agent. The active component includes tungsten oxide and rhenium heptaoxide, and the auxiliary agent includes iron and an organic complexing agent. This selective hydrogenation catalyst ensures the hydrogenation of C=C double bonds or olefins while preventing hydrogenation saturation of aromatic rings or aromatic hydrocarbons, and also possesses strong hydrodesulfurization performance.