55results about "Sulfite preparation" patented technology

A method for recovering at least one metallic element from ore or other material is described and includes reacting ore or other material with a salt capable of recovering the metallic element from the ore or other material to form a reaction product that includes the metallic element. The method also includes recovering the metallic element from the reaction product. To remove the metallic element from the reaction product, the method can involve crushing the reaction product to form a crushed material and dissolving the crushed material in a solvent to remove the precipitates, thereby leaving a sulfate solution containing the metallic element.

A process for continuous production of ammonium thiosulphate, (NH4)2S2O3 (ATS) from NH3, H2S and SO2 is disclosed. A first feed stream comprising H2O, H2S and NH3 with a molar H2S:NH3 ratio <0.4 is partially condensed to form a condensate. The condensate is contacted with a third feed gas comprising H2S and the gas stream comprising NH3 and H2S is passed to a mixing device where the gas stream is dissolved in water drained off from an aerosol filter. A second feed gas stream comprising approximately ⅔ mole SO2 per mole of NH3 contained in the first feed stream is passed to a SO2 absorber. The aqueous solution produced in mixing device is contacted with the SO2 absorber.

The present invention provides an oxygen-absorbing resin composition, which is superior in oxygen absorbability, absorbs oxygen remaining in the container after sealing, keeps the contents in the container in good preservation, and improves moldability, dispersibility of the oxygen absorbent, stability of the oxygen absorbing performance, performance of preventing peeling and separation of the oxygen absorbent from the base resin, rigidity of the sealing part, and the like, which become problems in the case of including an oxygen absorbent having high oxygen absorbability and low compatibility with the base resin, as well as provides an oxygen-absorbing container cap and an oxygen-absorbing container plug using the same.The present invention provides an oxygen-absorbing resin composition characterized by being obtained by dispersing and blending an oxygen absorbent containing 20% or more of particles having a particle diameter of 1000 μm or less at a ratio of 20% or less to a base resin.

The present invention discloses a disposal method of a tail gas, which is produced from a thionyl chloride used in a chlorination reaction. The cost of the prior traditional tail gas disposal method is high because of large consumption of alkali, and a high environmental protection pressure is resulted from a plurality of finally produced waste water which contains heteroions. Firstly, the present invention uses water to absorb the hydrogenchloride of the tail gas by controlling the water consumption, and a first grade absorption obtains a concentrated hydrochloric acid, the a hydrogenchloride content of which is approximately saturated and little sulfur dioxide is contained; a second grade absorption is that water is used to process the tail gas after the first grad absorption for the second grade absorption, which is that the added water is not discharged to obtain a diluted hydrochloric acid which contains little hydrogenchloride and little sulfur dioxide, and the diluted hydrochloric acid is used as a liquid of raw material used for the first grade absorption; then the alkali or alkaline water is used to process the tail gas after the second grade absorption for a third grade absorption to absorb the sulfur dioxide in the tail gas and obtain a quite pure sodium sulfite aqueous solution. The disposal efficiency of the present invention is high, and the tail gas absorption is complete, which reduces the environmental protection pressure.