Mitsui Engineering and Shipbuilding Company Limited

Idemitsu Petrochemical Co., Ltd.

Masahiro Takahashi

Toru Iwasaki

Takashi Arai

Kenji Ogawa

Shinji Takahashi

Noriyuki Kunishi

Shigeru Nagamori

Kiyoshi Horiguchi

Nobuyasu Kanda

Tetsuro Murayama

Yuichi Katoh

Toshio Yamaki

Masafumi Aoba

Akira Tokinosu

Kouhei Takamoto

Akihiro Shishikura

Hiroaki Motegi

Seiji Takahashi

Kenichi Sano

Nobutaka Ohya

Takashi Tsukahara

Masahiro Okamura

Noriya Tokunaga

Tetsuo Hayase

To enable long-term continuous operation by preventing blocking of a reaction pipe line disposed in a multi-pipe or double-walled-pipe heat exchanger, provided is a device for producing gas hydrate including a multi-pipe or double-walled-pipe devicefor generating gas hydrate having a reaction pipe linefor flowing raw material water w and raw material gas g and a coolant circulation regionfor circulating a coolant c and thereby cooling the reaction pipe line, wherein a coil springextending in the longitudinal direction of the reaction pipe lineis provided in the reaction pipe line

Device for producing gas hydrate

The operation of a plant for producing a gas hydrate is stabilized by making the gas phase within a downstream step have the same equilibrium composition as that of the gas phase within a generation step. The gas phase within a mixed-gas hydrate generation step is circulated to the gas phase within a downstream step located downstream of the mixed-gas hydrate generation step, and the gas phase within each step is thereby made to have the same equilibrium composition as that of the gas phase within the generation step.

Method for operating plant for producing mixed-gas hydrate

Provided is a process and an apparatus for producing at low cost gas hydrate pellets having an excellent storability. A gas hydrate generated from a raw-material gas and raw-material water is dewatered and simultaneously molded into pellets with compression-molding means under conditions suitable for generating the gas hydrate while the gas hydrate is generated from the raw-material gas and the raw-material water that exist among particles of the gas hydrate.

Process and apparatus for producing gas hydrate pellet

A gas hydrate production apparatus capable of reacting a raw gas with a raw water to thereby form a slurry gas hydrate and capable of removing water from the slurry gas hydrate by means of a gravitational dewatering unit. The gravitational dewatering unit is one including a cylindrical first tower body; a cylindrical dewatering part disposed on top of the first tower body; a water receiving part disposed outside the dewatering part; and a cylindrical second tower body disposed on top of the dewatering part, wherein the cross-sectional area of the second tower body is continuously or intermittently increased upward from the bottom.

Gas hydrate production apparatus

Disclosed is a process for production of a gas hydrate, wherein the process comprises a gas hydrate production step, a cooling step, a depressurizing step and a re-cooling step. In the cooling step, the temperature (T) required for the cooling of the gas hydrate is adjusted to a temperature equal to or higher than a cooling limit temperature (t+t) (which is a sum of an equilibrium temperature (t) of the gas hydrate and a temperature for correction (t)) and equal to or lower than the freezing point (0&#xb0; C.).

Process for production of gas hydrate

The composition of raw mixed gas and the gas composition of produced mixed gas hydrate are uniformed as rapidly as possible. The process for producing a mixed gas hydrate comprises the gas hydrate forming step of reacting a mixed gas (g) with water (w) to thereby obtain a gas hydrate in slurry form; the dewatering step of removing the water (w) from the gas hydrate slurry (s); the palletizing step of forming the gas hydrate after water removal into pellets; the freezing step of chilling the gas hydrate pellets (p) to the freezing point or below to thereby freeze the same; and the pressure reduction step of depressurizing the frozen gas hydrate to storage pressure, wherein the mixed gas (g) fed to the gas hydrate forming step is diluted by diluent gas (m) as a constituent of the principal components of the mixed gas (g).

Process for producing mixed gas hydrate

A gas hydrate production apparatus capable of reacting a raw gas with a raw water to thereby form a slurry gas hydrate and capable of removing water from the slurry gas hydrate by means of a gravitational dewatering unit. This gravitational dewatering unit is one including a cylindrical first tower body; a cylindrical dewatering part disposed on top of the first tower body; a water receiving part disposed outside the dewatering part; and a cylindrical second tower body disposed on top of the dewatering part, wherein the cross-sectional area of the second tower body is continuously or intermittently increased upward from the bottom.

Gas hydrate production apparatus and dewatering unit

Process for producing polycarbonates

Granules collected from a solution of a polycarbonate, an integrated structure of independent fine particles constituting the granules being formed at least on the surfaces of the granules; and a process for preparing the granules of the polycarbonate which comprises the steps of adding a poor solvent to the polycarbonate solution, and then agitation-granulating fine particles of the polycarbonate into the granules, while stirring involving a shear force-imparting function is carried out under heating. According to the present invention, the polycarbonate or the like can be collected from its organic solvent solution as the granules having good drying properties.

Polymer granules containing little residual solvent

Growing community of inventors

Ichihara, Japan

Masahiro Takahashi