摘要:
A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, comprises using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Nanull:Knull in the range from 70:30 to 95:5 and with a total concentration of Nanull and Knull in the range from 0.1 to 10 m/m % based on the total amount of the mixture.
摘要:
Toluene diisocyanate is recovered from a crude distillation feed comprising less than 2% by weight of phosgene by (a) fractionating the crude distillation feed comprising less than 2% by weight of phosgene to remove the solvent and optionally the reaction residues to produce a crude toluene diisocyanate feed comprising less than 20% by weight of solvent and (b) separating the crude toluene diisocyanate feed comprising less than 20% by weight of solvent in a divided-wall distillation column into four product fractions P1-P4. P1 is a vapor phase low-boiler and solvent-enriched gas stream, P2 is a low-boiler and solvent-enriched product, P3 is a high boiler-enriched bottoms product comprising toluene diisocyanate and P4 is a toluene diisocyanate product stream lean in low-boilers, high-boilers and reaction residues.
摘要:
A wave powered evaporation desalination system for removing fresh water from salt water by extraction of water vapor from a negative pressure container using wave motion for power. The wave powered evaporation desalination system includes a first vessel that accepts salt water. The salt water is forced from the first vessel through a atomizing spray nozzle into the top of a negative pressure second vessel. The negative pressure second vessel includes a number of trays that fill up with salt water films. Two pumps are attached to the top of the second vessel. One pump draws brine from the bottom of the second vessel for dispersion outside the system. The other pump draws off the water vapor from the second vessel into a hose and back to normal atmospheric pressure. The two pumps are powered by a float hinged to the second vessel.
摘要:
A vacuum low-temperature distilled pure water dispenser includes a water-supply tank communicating with a reaction chamber via a water supply line, a pure water storage tank communicably located above the reaction chamber, an actuating pump communicably located below the reaction chamber, and a refrigerating system having pipe lines extended between the reaction chamber and the pure water storage tank. When the actuating pump is actuated, a vacuum is produced in the reaction chamber to suck water in the water-supply tank into the reaction chamber, at where the sucked water is heated and vaporized by heat provided by a compressor of the refrigerating system, so that impurities, organic and inorganic matters, bacteria, and viruses in the water are separated therefrom through vacuum low-temperature distillation. When the actuating pump keeps pumping, the distilled water is sent from the reaction chamber into the pure water storage tank.
摘要:
Bubble columns fractionate with vapor-liquid mass transfer efficiencies approaching that of distillation towers when vapor velocities in excess of 50% of jet flood are used. If the vapor velocities are pushed above about 70% of jet flood then the distillation performance of a given column packing becomes similar for both liquid continuous operation (bubble column mode) and vapor continuous operation (ordinary distillation tower mode).
摘要:
A process for the preparation of propylene oxide in the presence of methanol, in which propylene oxide is separated from a mixture comprising propylene oxide and methanol, and the resultant mixture comprising methanol is worked up, which comprises separating methanol from a mixture comprising methanol and methyl formate during the work-up.
摘要:
A method and an apparatus for treating gasoline vapor by bringing gasoline vapor within a fuel tank into contact with a fluid gasoline and making the fluid gasoline absorb the gasoline vapor, in order to improve absorptivity of the gasoline vapor and to reduce the amount of the gasoline vapor introduced into a canister, thereby attaining a canister downsizing. The method and apparatus comprise a separation device of introducing the liquid gasoline within the fuel tank and separating it into a low boiling point component and a high boiling point component, and a gas-liquid contact device of bringing the gasoline vapor within the fuel tank into contact with an extractive gasoline composed of the high boiling point component separated by the separation device, whereby when contacting the gasoline vapor with the extractive gasoline, a part of the gasoline vapor is absorbed to the extractive gasoline, and a residual of the gasoline vapor not absorbed to the extractive gasoline is introduced into a canister.
摘要:
The present invention provides a system and method for utilizing DDGS by-products from an ethanol plant. In one embodiment, the DDGS is burned to release thermal energy, which is used to produce steam needed for the operation of the ethanol plant. This method can realize approximate 67% savings in the fuel cost over the conventional propane-fueled ethanol plant.
摘要:
The present invention provides a column treating method by use of a distillation column and so on, which method enables to effectively remove solid impurities such as precipitates and polymers contained or produced in a treating fluid, and to thereby stably operate the column treatment. Solid impurities in a treating fluid can be removed by carrying out: step (a) of drawing out the treating fluid from a drawing out outlet (16) at the column bottom of the treatment column (10) outside the treatment column (10), step (b) of removing solid impurities from the treating fluid, drawn out in step (a), by a strainer (40), and step (c) of returning the treating fluid, from which the solid impurities are removed in step (b), to a returning inlet (18) of the treatment column, with advancing physical and/or chemical treatment of the treating fluid in the treatment column (10).
摘要:
An improved portable water purification system with reduced leaks and the capability of automatic draining of its boiling tank. The system includes a manifold that is used to control the inlet of water to the system, as well as to control draining of the boiling tank. The manifold is designed to create a suction in the drain line to enhance draining of the boiling tank.