摘要:
The present invention relates to a novel oxide catalyst, more specifically, a novel modified magnesium oxide catalyst which is highly active and selective for ortho-alkylation of phenol.The catalysts for phenol alkylation of the invention are represented as Mg.sub.a Mn.sub.b L.sub.c T.sub.d Q.sub.e O.sub.x .wherein:L is vanadium or chromium;T is alkali metal, alkali earth metal, lead, bisumth, cobalt, aluminum, silicon., gallium, germanium or molybdenum;Q is antimony, cesium or iron;b/a=0 to 0.35(atomic molar ratio);c/a=0.01 to 0.35(atomic molar ratio);d/a=0 to 0.35(atomic molar ratio);e/c=0.1 to 10(atomic molar ratio); and,x is determined by oxidation state of each component.
摘要翻译:本发明涉及一种新型氧化物催化剂,更具体地说,涉及一种对苯酚进行正烷基化反应具有高活性和选择性的新型改性氧化镁催化剂。 本发明的苯酚烷基化催化剂表示为MgaMnbLcTdQeOx。 其中:L为钒或铬; T是碱金属,碱土金属,铅,二价,钴,铝,硅,镓,锗或钼; Q是锑,铯或铁; b / a = 0〜0.35(原子摩尔比); c / a = 0.01〜0.35(原子摩尔比); d / a = 0〜0.35(原子摩尔比); e / c = 0.1〜10(原子摩尔比); 并且x由每个组分的氧化态决定。
摘要:
A bottom chassis includes a bottom portion having at least one deformation-preventing region therethrough and a sidewall portion connected to at least one side of the bottom portion. The bottom portion includes a first side extending along a first direction and a second side extending along a second direction crossing the first direction. The first direction is substantially perpendicular to a longitudinal direction of the at least one deformation-preventing region, and the second direction is substantially parallel to the longitudinal direction of the at least one deformation-preventing region.
摘要:
A bottom chassis includes a bottom portion having at least one deformation-preventing region therethrough and a sidewall portion connected to at least one side of the bottom portion. The bottom portion includes a first side extending along a first direction and a second side extending along a second direction crossing the first direction. The first direction is substantially perpendicular to a longitudinal direction of the at least one deformation-preventing region, and the second direction is substantially parallel to the longitudinal direction of the at least one deformation-preventing region.
摘要:
The present invention relates to a direct seeder. A fertilizer receptacle and a seed receptacle integrally formed with each other in the conventional art are separated from each other. A single fertilizer receptacle and a single seed receptacle are used in place of a plurality of fertilizer receptacles and a plurality of seed receptacles according to the conventional art. The fertilizer receptacle and seed receptacle are installed to be positioned so low that fertilizer and seeds can be easily poured into the fertilizer receptacle and seed receptacle. A screw conveyor for removing the traces of tractor wheels is installed on the direct seeder.
摘要:
A method of manufacturing a phase change memory device includes forming a lower electrode layer pattern and an insulating interlayer covering the lower electrode layer pattern, forming a first opening in the insulating interlayer to expose the lower electrode layer pattern, forming an oxide layer pattern on the sidewall of the first opening and a lower electrode under the oxide layer pattern by partially removing the oxide layer and the lower electrode layer pattern, forming an insulation layer filling a remaining portion of the first opening, removing the oxide layer pattern by a wet etching process to form a second opening, and forming a phase change material pattern on the lower electrode such that the phase change material pattern fills the second opening.
摘要:
The present invention relates to a process and equipment for preparing highly polymerized aromatic polycarbonate by postpolymerizing polycarbonate prepolymer. The polycarbonate prepolymer is formed by the melt transesterification of carbonate ester and diol compound. The polycarbonate prepolymer is postpolymerized using a horizontal tubular reactor comprising rotational plates, several separated compartments divided by the rotational plates, and vents. The degree of polycarbonate polymerization can be continuously controlled by regulating the residence time of reactants in the reactor compartments. This is achieved in the present invention by regulating the rate of polycarbonate prepolymer injection into the reactor. Discoloration of final products can be prevented in the present invention by discharging byproduct(s), aromatic alcohol, from the reactor compartment through a vent.
摘要:
The present invention relates to a direct seeder. A fertilizer receptacle and a seed receptacle integrally formed with each other in the conventional art are separated from each other. A single fertilizer receptacle and a single seed receptacle are used in place of a plurality of fertilizer receptacles and a plurality of seed receptacles according to the conventional art. The fertilizer receptacle and seed receptacle are installed to be positioned so low that fertilizer and seeds can be easily poured into the fertilizer receptacle and seed receptacle. A screw conveyor for removing the traces of tractor wheels is installed on the direct seeder.
摘要:
A process for preparing pale-colored and transparent alkyl glycosides by reacting glucose and high fatty alcohol in presence of an acid catalyst is disclosed. The process comprises the steps of admixing, reacting, neutralizing, distilling, diluting and bleaching. In the above process, the reaction step is controlled by a product color and an amount of unreacted glucose, the neutralizing step is controlled by alkali metal oxdie powders having a specific surface area of more than 30 m2/g and the product color, the distilling step is controlled an unreacted residual fatty alcohol, and the diluting step is controlled by refined ion water and sealed vessel without oxygen. Further, the process provides a method of recycling collected fatty alcohol without being refined.