Yokohama, Japan
Yokohama, Japan

Chiyoda Corporation is a large Japanese engineering company specialising in industrial facilities, particularly oil refineries and LNG facilities. Most of its business takes place outside Japan, normally in the Middle East.In the late 1960s it built the Jeddah and Riyadh refineries in Saudi Arabia; at present its large projects include LNG plants in Qatar, the Sakhalin-II project in eastern Russia, and a variety of specialist-chemical and pharmaceutical plants in Japan itself.It was, in 2005, the first engineering company in the world to be included in the FTSE4Good index of companies with exemplary corporate social responsibility.It had a 484 billion yen revenue and 23.5 billion yen profit in 2006. Wikipedia.


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Patent
Chiyoda Corporation | Date: 2015-02-20

In a system for hydrogenation of an aromatic compound, an excessive temperature rise in the hydrogenation reaction unit is prevented, and the amount of the dilution gas to be circulated is minimized. The hydrogenation system (1) comprises a hydrogenation reaction unit (2) for producing a hydrogenated aromatic compound by adding hydrogen to an aromatic compound via a hydrogenation reaction, a separation unit (3) for separating the hydrogenated aromatic compound from a product of the hydrogenation reaction unit, and a transportation unit (4) for circulating at least a part of a residual component remaining in the separation unit after separating the hydrogenated aromatic compound therefrom to the hydrogenation reaction unit. The hydrogen supplied to the hydrogenation reaction unit consists of diluted hydrogen (L2) diluted by a dilution compound having a higher molar specific heat than nitrogen, and the dilution compound includes a component circulated to the hydrogenation reaction unit as the residual component.


Patent
Chiyoda Corporation, Air Products and Chemicals Inc | Date: 2016-10-14

By using the power generated by an expander by an expansion of material gas, the outlet pressure of a compressor is increased, and a requirement on the cooling capacity of a cooler is reduced. The liquefaction system (1) for natural gas comprises a first expander (3) for generating power by expanding natural gas under pressure as material gas; a first cooling unit (11, 12) for cooling the material gas depressurized by expansion in the first expander; a distillation unit (15) for reducing or eliminating a heavy component in the material gas by distilling the material gas cooled by the first cooling unit; a first compressor (4) for compressing the material gas from which the heavy component was reduced or eliminated by the distillation unit by using the power generated in the first expander; a second heat exchanger for exchanging heat between the material gas introduced into the first compressor and the material gas compressed by the first compressor; and a liquefaction unit (21) for liquefying the material gas compressed by the first compressor by exchanging heat with a refrigerant.


Patent
Chiyoda Corporation | Date: 2017-02-01

A heat-medium discharge device and a heat-medium discharge method capable of discharging a heat medium from a solar heat collection device in short time without installing a tank at a position lower than the solar heat collection device are provided. A heat-medium discharge device includes: a vent portion (15) which is provided at a highest position of a heat medium channel (2); compressed air supply means (12) which supplies compressed air to the heat medium channel (2) when a heat medium is discharged; a pipe (5) which is connected to the heat medium channel (2); and a tank (6) which is connected to the pipe (5) and stores the heat medium fed from the heat medium channel (2) by the compressed air and flowing through the pipe (5). Accordingly, when the vent portion (15) is opened so that air is introduced into the heat medium channel (2) and compressed air is supplied from the compressed air supply means (12) during the heat medium discharge operation, the heat medium which is fed from the heat medium channel (2) by the compressed air and flows through the pipe (5) can be stored in the tank (6). Thus, it is possible to discharge the heat medium from a solar heat collection device (1) in short time by the pressure of the compressed air without installing the tank (6) at a position lower than the solar heat collection device.


Patent
Chiyoda Corporation | Date: 2017-02-01

Provided is a system and a method which allow hydrogen to be produced both efficiently and in a stable manner when using exhaust gas produced by power generation as a heat source for the dehydrogenation reaction, controlling the temperature of the dehydrogenation reaction within an appropriate range. The system (1) for producing hydrogen comprises a dehydrogenation reaction unit (51) for producing hydrogen from an organic hydride by a dehydrogenation reaction in presence of a dehydrogenation catalyst; a first power generation unit (2) for generating electric power from energy of combustion gas produced by combustion of fuel; a waste heat recovery unit (3) for receiving heat from exhaust gas expelled from the first power generation unit; a heat exchanger (21) provided in the waste heat recovery unit for exchanging heat between the exhaust gas and a heat medium; and a circulation line (L1 - L3) for introducing the heat medium heated in the heat exchanger to the dehydrogenation reaction unit in liquid form, and returning the heat medium expelled from the dehydrogenation reaction unit to the heat exchanger; wherein the heat medium is introduced into the dehydrogenation reaction unit at an introduction temperature ranging between 352 C and 392 C, the heat medium is expelled from the dehydrogenation reaction unit at an expulsion temperature ranging between 337 C and 367 C, and a difference between the introduction temperature and the expulsion temperature ranges between 10 C and 50 C.


Patent
Chiyoda Corporation | Date: 2017-01-18

To allow hydrogen to be supplied to a dehydrogenation reaction unit for dehydrogenating an organic hydride by using a highly simple structure so that the activity of the dehydrogenation catalyst of the dehydrogenation reaction unit is prevented from being rapidly reduced. The hydrogen production system (1) comprises a first dehydrogenation reaction unit (3) for producing hydrogen by a dehydrogenation reaction of an organic hydride in presence of a first catalyst, and a second dehydrogenation reaction unit (4) for receiving a product of the first dehydrogenation reaction unit, and producing hydrogen by a dehydrogenation reaction of the organic hydride remaining in the product in presence of a second catalyst, wherein an amount of the first catalyst used in the first dehydrogenation reaction unit is equal to or less than an amount of the second catalyst used in the second dehydrogenation reaction unit, and an amount of hydrogen produced in the first dehydrogenation reaction unit is less than an amount of hydrogen produced in the second dehydrogenation reaction unit.


Patent
Chiyoda Corporation | Date: 2017-01-04

In a system for hydrogenation of an aromatic compound, an excessive temperature rise in the hydrogenation reaction unit is prevented, and the amount of the dilution gas to be circulated is minimized. The hydrogenation system (1) comprises a hydrogenation reaction unit (2) for producing a hydrogenated aromatic compound by adding hydrogen to an aromatic compound via a hydrogenation reaction, a separation unit (3) for separating the hydrogenated aromatic compound from a product of the hydrogenation reaction unit, and a transportation unit (4) for circulating at least a part of a residual component remaining in the separation unit after separating the hydrogenated aromatic compound therefrom to the hydrogenation reaction unit. The hydrogen supplied to the hydrogenation reaction unit consists of diluted hydrogen (L2) diluted by a dilution compound having a higher molar specific heat than nitrogen, and the dilution compound includes a component circulated to the hydrogenation reaction unit as the residual component.


The invention provides a treatment process of a gas containing zero-valent mercury and a mercury separation system, by which the amount of an iodine compound used can be reduced when the zero-valent mercury is separated from the gas containing the zero-valent mercury by using the iodine compound. The treatment process of the gas containing the zero-valent mercury has a mercury oxidation step of oxidizing the zero-valent mercury contained in the gas containing the zero-valent mercury with a first liquid phase containing an alkali metal iodide to take the zero-valent mercury into the first liquid phase, thereby obtaining a second liquid phase containing a divalent mercury ion and an iodide ion; a mercury separation step of separating the divalent mercury ion as mercury sulfide by adjusting the pH of the second liquid phase obtained in the mercury oxidation step with a pH adjustor and adding an alkali metal sulfide; and a first circulation step of circulating a third liquid phase which is obtained by separating the mercury sulfide in the mercury separation step and contains an alkali metal ion and the iodide ion to use the third liquid phase as the first liquid phase in the mercury oxidation step.


Patent
Chiyoda Corporation | Date: 2017-02-01

Provided is a heat-medium discharge device capable of promptly discharging a heat medium from a heat medium channel of a solar heat collection device and decreasing a remaining heat medium amount therein during the heat medium discharge operation when a pump for circulating the heat medium in the heat medium channel is stopped or is under maintenance. A heat-medium discharge device is connected to an angled pipe (5) serving as a heat medium discharge destination of a heat medium channel (2) through which a heat medium flows in a solar heat collection device (1) and is provided in a connection end (2a). A reverse gas flow prevention portion (31) is provided so that a heat medium flow direction directed toward the angled pipe (5) during a heat medium discharge operation is directed upward and downward. The reverse gas flow prevention portion (31) prevents a gas from flowing reversely in the flow direction inside the heat medium channel (2) from the angled pipe (5) when the heat medium is discharged.


Patent
Chiyoda Corporation | Date: 2017-02-01

A heat-medium discharge device and a heat-medium discharge method capable of discharging a heat medium from a solar heat collection device by gravity without installing a tank at a position lower than the solar heat collection device are provided. Since a heat-medium discharge device includes: a vent portion (15) which is provided at a highest position of a heat medium channel (2) of a solar heat collection device (1); an angled pipe (5) which is connected to the heat medium channel (2); a drain container (16) which is connected to a position lower than the connection portion of the heat medium channel (2) in the angled pipe (5) ; and a pump (20) which feeds the heat medium from the drain container (16) to the tank (6), the vent portion (15) is opened to introduce air during a heat medium discharge operation so that the heat medium flows through the heat medium channel (2) and the angled pipe (5) by gravity, is received in the drain container (16), and is further fed to the tank (6) by the pump (20). Accordingly, it is possible to discharge the heat medium from the solar heat collection device (1) by gravity without installing the tank (6) at a position lower than the solar heat collection device (1).


Patent
Chiyoda Corporation | Date: 2017-02-08

Provided is a heat-medium discharge device capable of preventing a heat medium from leaking from a vent portion due to the reverse flow of the heat medium in a part of heat medium channels in accordance with a pressure of the heat medium flowing downward when the vent portions of the heat medium channels of a plurality of solar heat collection devices are opened at the substantially same timing so that the heat medium flows downward based on a height difference. A heat medium channel (2) of a solar heat collection device (1) is provided with a height difference causing a heat medium inside the heat medium channel (2) to flow downward to an angled pipe (5). A highest portion of the heat medium channel (2) is provided with a vent portion (15) capable of opening and closing to receive air when the heat medium is discharged. The vent portion (15) is provided with leakage prevention means which prevents the heat medium from leaking from the vent portion (15) when the heat medium of the heat medium channel flows reversely in a discharge direction. The leakage prevention means includes a vent valve and a check valve or includes a pressuremeter (32) measuring a pressure inside the heat medium channel (2) and a vent valve (15b) closing the vent portion (15) when a measurement value of the pressuremeter (32) becomes a positive pressure.

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