摘要:
The method of preparing a chromium oxide catalyst for preparation of pentafluoroethane using a chloroethane compound includes heat treating chromium hydroxide powder at a temperature not higher than 300° C. to obtain chromium oxide powder, heat treating metal hydroxide, at a temperature not higher than 300° C. to obtain metal oxide powder, mixing 85-99.5 wt % of the chromium oxide powder with 0.5-15 wt % of the metal oxide powder to obtain a mixture, forming the mixture into a pellet, calcining the pellet at 200-300° C. using nitrogen gas, and fluorinating the pellet at 300-320° C. using a gas mixture including N2 and HF, and then at 320-380° C. using HF gas. The fluorination catalyst prepared using the method of this invention can be effectively used to prepare pentafluoroethane at a high yield using a chloroethane compound.
摘要翻译:使用氯乙烷化合物制备五氟乙烷的氧化铬催化剂的方法包括在不高于300℃的温度下热处理氢氧化铬粉末,得到不高于300℃的氧化铬粉末,热处理金属氢氧化物 ℃,得到金属氧化物粉末,将85-99.5重量%的氧化铬粉末与0.5-15重量%的金属氧化物粉末混合以获得混合物,将混合物形成颗粒,在200-300℃下煅烧沉淀 ℃,并使用包含N 2 H 2和HF的气体混合物,然后在320-380℃下使用HF气体在300-320℃氟化颗粒。 使用本发明的方法制备的氟化催化剂可以有效地用于使用氯乙烷化合物以高产率制备五氟乙烷。
摘要:
Disclosed is a method of charging a low temperature liquefied gas in a gaseous state in a high pressure charging cylinder using a pump. The method is advantageous in that it is possible to charge a low temperature liquefied gas which is to be made highly pure in a high pressure gas cylinder using a simple process in which purity is not changed and little energy is consumed during the charging of the liquefied gas.
摘要:
The method of storing nitrogen trifluoride includes storing nitrogen trifluoride in a chromium-molybdenum steel vessel manufactured through a deep drawing ironing process. Nitrogen trifluoride stored in this way according to the method of this invention does not deteriorate even after two years or more have passed.
摘要:
Disclosed is a method of charging a low temperature liquefied gas in a high pressure charging cylinder using a diaphragm pump. The method is advantageous in that it is possible to charge a low temperature liquefied gas which is to be made highly pure in a high pressure gas cylinder using a simple process in which the liquefied gas does not deteriorate and small energy is consumed.
摘要:
Semiconductor devices may include a semiconductor substrate with a first semiconductor fin aligned end-to-end with a second semiconductor with a recess between facing ends of the first and second semiconductor fins. A first insulator pattern is formed adjacent sidewalls of the first and second semiconductor fins and a second insulator pattern is formed within the first recess. The second insulator pattern may have a top surface higher than a top surface of the first insulator pattern, such as to the height of the top surface of the fins (or higher or lower). First and second gates extend along sidewalls and a top surface of the first semiconductor fin. A dummy gate electrode may be formed on the top surface of the second insulator. Methods for manufacture of the same and modifications are also disclosed.
摘要:
Semiconductor devices may include a semiconductor substrate with a first semiconductor fin aligned end-to-end with a second semiconductor with a recess between facing ends of the first and second semiconductor fins. A first insulator pattern is formed adjacent sidewalls of the first and second semiconductor fins and a second insulator pattern is formed within the first recess. The second insulator pattern may have a top surface higher than a top surface of the first insulator pattern, such as to the height of the top surface of the fins (or higher or lower). First and second gates extend along sidewalls and a top surface of the first semiconductor fin. A dummy gate electrode may be formed on the top surface of the second insulator. Methods for manufacture of the same and modifications are also disclosed.
摘要:
A method of manufacturing a semiconductor device includes forming an interlayer dielectric film that has first and second trenches on first and second regions of a substrate, respectively, forming a first metal layer along a sidewall and a bottom surface of the first trench and along a top surface of the interlayer dielectric film in the first region, forming a second metal layer along a sidewall and a bottom surface of the second trench and along a top surface of the interlayer dielectric film in the second region, forming a first sacrificial layer pattern on the first metal layer such that the first sacrificial layer fills a portion of the first trench, forming a first electrode layer by etching the first metal layer and the second metal layer using the first sacrificial layer pattern, and removing the first sacrificial layer pattern.
摘要:
Provided are a semiconductor device and a method for fabricating the same. The semiconductor device includes a lower fin that protrudes from a substrate and extends in a first direction, an oxide film the lower fin, an upper fin that protrudes from the oxide film and that is spaced apart from the lower fin at a position corresponding to the lower fin, and a gate structure the upper fin that extends in a second direction to intersect the upper fin, wherein germanium (Ge) is included in a portion of the oxide film located between the lower fin and the upper fin.
摘要:
A method includes forming a first etch target layer and a first mask layer on a substrate. Sacrificial patterns extending in a first direction are formed on the first mask layer in a second direction. Spacers are formed on sidewalls of the sacrificial patterns. After removing the sacrificial patterns, the first mask layer is etched using the spacers as an etching mask to form first masks. Second masks are formed on sidewalls of each first mask to define a third masks including each first mask and the second masks on sidewalls of each first mask. The first etch target layer is etched using the first and third masks as an etching mask to form first and second patterns in the first and second regions, respectively. Each first pattern has a first width, and each second pattern has a second width greater than the first width.
摘要:
Disclosed is a lyocell multi-filament for a tire cord and a method of producing the same. The method includes i) dissolving mixed powder of cellulose and polyvinyl alcohol in a mixed solvent of N-methyl morpholine N-oxide and water to prepare a dope, ii) extruding the dope using a spinning nozzle including orifices through air gaps into a conical upper coagulation bath to solidify the dope to produce a multi-filament, iii) feeding the multi-filament through a lower coagulation bath to a washing bath, and washing the multi-filament, and iv) drying and oiling the washed multi-filament and winding the resulting multi-filament. At this time, the orifices each have a diameter (D) of 100 to 300 μm, a length (L) of 200 to 2400 μm, and a ratio of the length to the diameter (L/D) of 2 to 8, and are spaced apart from each other at intervals of 2.0 to 5.0 mm. The method provides a lyocell multi-filament having excellent physical properties useful as a tire cord, thereby producing a tire for an automobile having improved driving stability, dimensional stability, and uniformity using the tire cord.