Tsukishima Kikai Co., Ltd.

Mitsubishi Gas Chemical Company, Inc.

Central Research Institute of Electric Power Industry

Keizo Takegami

Minoru Morita

Koji Miwa

Kiwamu Ishii

Junji Wakayama

Kazuto Nakamaru

Hideki Kanda

Hisao Makino

Mayumi Morita

Kenji Ouchi

Akio Yoshikoshi

Ryoji Sugamiya

Masazumi Takahashi

A treatment system for a watery material that includes: a dewatering tank in which liquefied matter of a material that is gaseous at a normal temperature and a normal pressure is contacted with the watery material and the watery material is separated into the resultant watery material and a liquid phase that contains an aqueous component from the watery material; an evaporator that vaporizes the material that is gaseous at a normal temperature and a normal pressure from the liquid phase; a separator that separates a gas of the material thus vaporized from effluent water; a condenser that condenses the gas into liquefied matter, two or more external heat sources selected from atmosphere, sewage, warm effluent water, and ground water; an external heat temperature detector that detects temperatures of external heats of the external heat sources; and an external heat supply destination controlling unit.

Hydrous matter treatment system

A method including carrying out adiabatic cooling and evaporation operation of a coolant in a crystallizer () for a mixture solution of a target organic compound containing the coolant; taking out crystal slurry produced by the operation from the crystallizer (); pressurizing evaporated vapor to a pressure higher than the operation pressure in the crystallizer () by a compressor () and then introducing the vapor to an absorption condenser (); cooling for condensation the mixture solution of organic compound and the evaporated vapor that has been pressurized while allowing them to contact each other in the absorption condenser (); introducing the crystal slurry taken out of the crystallizer () to a purification means () for purification of the crystal; and introducing a clarified liquid in the purification means () to at least one of the crystallizer () and the absorption condenser ().

Method for adiabatic cooling type crystallization of organic compound and apparatus therefor

The present invention provides a method for adiabatic cooling type crystallization of organic compound and an apparatus therefore, by which running cost and facility cost can be reduced. The method comprises carrying out adiabatic cooling and evaporation operation of a coolant in a crystallizerfor a mixture solution of a target organic compound containing the coolant; taking out crystal slurry produced by the operation from the crystallizer; pressurizing evaporated vapor to a pressure higher than the operation pressure in the crystallizerby a compressor, introducing the vapor to an absorption condenser; cooling for condensation the mixture solution of organic compound and the evaporated vapor that has been pressurized while allowing them to contact each other in the absorption condenser; and introducing this absorption condensate to the crystallizer

Adiabatic self-evaporation cooling of a refrigerant is performed in a crystallizer for a treated organic matter which contains the refrigerant and is fed into the crystallizer. Crystals produced by the adiabatic self-evaporation cooling are withdrawn from the crystallize. An evaporated vapor is introduced from the crystallizer into an absorber so as to be contacted with a concentrated solution transformed from a generator for condensation in the absorber. A condensate is introduced from the absorber into the generator, the refrigerant is evaporated in the generator, an evaporated vapor is introduced from the generator to the condenser, the evaporated vapor is condensed in the condenser, a condensate is supplied from the condenser to the crystallizer and the concentrated solution is circulated between the absorber and the generator by returning the concentrated solution, in which the concentration of an absorbent is increased by the generator to the absorber.

Apparatus for crystallization of organic matter

Method and apparatus for crystallization of organic matter

A countercurrent, cooling crystallization and purification method for a multi-component molten mixture wherein the mixture is treated by a purification system comprising one or more crystallizers (1A, 1B) each having, at the respective upper portion, a clarifying portion (10A, 10B) and a purifier (2) arranged in series to the crystallizer or crystallizers and having, at its upper portion, a clarifying portion (20), the crystallizer or crystallizers and the purifier having a temperature difference therebetween and disposed in the order of temperature. The starting mixture is fed to one of the crystallizers and subjected to crystallization there, and the resulting crystals are taken out from the bottom of the crystallizer and fed to another crystallizer or a purifier of higher temperature while the clarified liquid, i.e., mother liquor positioned at the clarifying portion of the crystallizer is led to another crystallizer of lower temperature or discharged out of the system. In each of the crystallizers and purifier, the crystals are moved downwardly while the mother liquor is moved upwardly to effect countercurrent contact with the mother liquor. Through this countercurrent contact of the crystals with the mother liquor of higher temperature, the crystals are purified by being washed with the mother liquor. With this arrangement, the purification of the mixture can be attained effectively and at a reasonable cost.

Countercurrent, cooling crystallization and purification method for

A mixture containing monochloroacetic acid and dichloroacetic acid as the main components are admixed with 5-25% by weight of water on the basis of sum total of monochloroacetic acid, dichloroacetic acid and water, and subjected to adiabatic cooling under a pressure of 133 to 2,660 Pa, whereby monochloroacetic acid is crystallized with a high purity.

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Chuo-ku, Japan

Keizo Takegami