Abstract:
Catalyst compositions containing a metallocene compound, a solid activator, and a co-catalyst, in which the solid activator or the supported metallocene catalyst has a d50 average particle size of 15 to 50 μm and a particle size distribution of 0.5 to 1.5, can be contacted with an olefin in a loop slurry reactor to produce an olefin polymer. A representative ethylene-based polymer produced using the catalyst composition has excellent dart impact strength and low gels, and can be characterized by a HLMI from 4 to 10 g/10 min, a density from 0.944 to 0.955 g/cm3, a higher molecular weight component with a Mn from 280,000 to 440,000 g/mol, and a lower molecular weight component with a Mw from 30,000 to 45,000 g/mol and a ratio of Mz/Mw ranging from 2.3 to 3.4.
Abstract:
A pressure increasing system includes a plurality of stages of compressors configured to compress carbon dioxide to a pressure higher than a critical pressure; intermediate coolers cooling the carbon dioxide discharged from a compressor in a preceding stage; a subcooler provided between a seventh stage compressor in the final stage and a sixth stage compressor in a preceding stage and cools the carbon dioxide; a bypass line through which the carbon dioxide in the inlet of the seventh stage compressor is extracted, depressurized and supplied to the subcooler as a refrigerant; a flow rate adjusting valve provided on the bypass line; and a control unit configured to regulate a degree of opening of the flow rate adjusting valve so that at least one of a temperature and a pressure of the carbon dioxide in the inlet of the seventh stage compressor remains constant.
Abstract:
A gasification facility which uses flammable gas as a carrier medium for air-transporting powder fuel, used as a gasification raw material, to a gasification furnace and which can safely release the flammable gas, exhausted from a fuel feed hopper, to the atmosphere. In the gasification facility using flammable gas as a carrier medium for transporting pulverized coal as powder fuel from a pulverized coal feed hopper (7) to a gasification furnace (11), the flammable gas discharged from the pulverized coal feed hopper (7) is subjected to incineration treatment and then released to the atmosphere, so that safe release to the atmosphere can be implemented.
Abstract:
The present disclosure provides a steam cracking process, comprising heating a liquid feed stock in a convection section of a cracking furnace and subsequently conveying the material to a radiant section of the cracking furnace for cracking reaction therein, wherein a monoolefin-containing stream is conveyed to the cracking furnace for cracking reaction through at least one of modes A to C.
Abstract:
A discharge plasma machining device that includes punches as a pressing unit for applying a pressure with respect to a machined item, a direct current pulse current generator as a pulse current applying unit for applying a pulse current with respect to the machined item, a spectroscope as a detection unit for detecting a spectrum of light of plasma generated by application of a pulse current, and a control unit for controlling a pulse current in accordance with a detection result of the detection unit.
Abstract:
A fracture-safe viewport for a pressure system having a pressure port which is pumped by said pressure system to a pressure above or below atmospheric pressure, comprising a plurality of panes each capable of passing electromagnetic radiation therethrough, each pane being mounted inside a tubular structure and being hermetically sealed to the wall of the pressure chamber. Each of the panes may be a different material or any combination of materials may be used from the group comprising sapphire, glass and quartz or any other material through which a high powered laser or other electromagnetic beam may be directed without adverse consequences. Highly pure, defect-free, ultra-polished, single-crystal sapphire is preferred. Spacing between the panes is used in most embodiments to avoid shrapnel damage in case of catastrophic failure of a pane. Half-donut shaped or chimney-shaped strain relief mounts are used in some embodiments to relieve strain caused by differential rates of thermal expansion when the structure is heated.
Abstract:
A device and a method for continuous high-pressure treatment; the method, comprising the steps of increasing the pressure of raw materials (25) in a feed tank (9) by a pressurizing pump (1) so as to continuously feed the raw material to treatment containers (6) and (6a) and increasing the flow rate of the pressurizing pump (1) over that of a depressurizing pump (2) or continuously exhausting the raw material from the treatment containers (6) and (6a) through a pressure regulating flow path resistance (59) while depressurizing; the device, comprising pressure releasing bypass circuits (55) disposed in the flow path resistance (59) in parallel with each other, wherein the insides of the treatment containers (6) and (6a) are kept in a specified high-pressure state during the continuous processing.
Abstract:
In a two-step method of chemothermal conversion of feedstock in the form of fluid compounds or compounds convertible into a fluid state, into low-molecular, organic or inorganic compounds, the improvement including reaching an extremely high efficiency rate of the destruction of the compounds of the second preliminary step by introducing the compounds of the first preliminary step through at least one small mixing channel under excess pressure of between 1.5 atmospheres and 150 atmospheres, so that the start of the exothermic reaction is delayed until the compounds reach the main reaction chamber, wherein, due to the excess pressure, the compounds react very quickly in an explosion-like manner, thereby reaching a high temperature and high density of heat radiation immediately usable for the destruction of the molecular structure of the compounds of the second preliminary step, and introducing the compounds of the second preliminary step simultaneously with the compounds of the first preliminary step at the downstream end of the mixing channels of the first preliminary step where the exothermic reaction takes place, thus enabling the transfer of energy from the exothermic reaction of the compounds of the first preliminary step at a highest possible temperature and heat radiation level to the compounds of the second preliminary step.
Abstract:
In a two-step method of chemothermal conversion of feedstock in the form of fluid compounds or compounds convertible into a fluid state, into low-molecular, organic or inorganic compounds, the improvement including reaching an extremely high efficiency rate of the destruction of the compounds of the second preliminary step by introducing the compounds of the first preliminary step through at least one small mixing channel under excess pressure of between 1.5 atmospheres and 150 atmospheres, so that the start of the exothermic reaction is delayed until the compounds reach the main reaction chamber, wherein, due to the excess pressure, the compounds react very quickly in an explosion-like manner, thereby reaching a high temperature and high density of heat radiation immediately usable for the destruction of the molecular structure of the compounds of the second preliminary step, and introducing the compounds of the second preliminary step simultaneously with the compounds of the first preliminary step at the downstream end of the mixing channels of the first preliminary step where the exothermic reaction takes place, thus enabling the transfer of energy from the exothermic reaction of the compounds of the first preliminary step at a highest possible temperature and heat radiation level to the compounds of the second preliminary step.
Abstract:
A continuous hydrothermal synthesis method which comprises pressurizing and heating a material slurry below a saturated vapor temperature or pressurizing a material slurry at normal temperature, pressurizing and heating an aqueous liquid above the saturated vapor temperature, atomizing and mixing the slurry and the aqueous liquid, effecting hydrothermal synthesis in a reaction section above the saturated vapor temperature, cooling the reaction product and taking out the product while retaining the pressurized state in the system by alternately opening and closing shut-off valves provided above and below a product discharging section or through a thin pipe provided in the product discharging section. The method is performed using an apparatus comprising heating-pressurizing sections respectively connected to a material slurry feeding section and an aqueous liquid feeding section, an atomizing-mixing section and a reaction section provided after these feeding sections, and a product discharging section.