Patent
Removal of contaminants from gas streams in rayon production
TLDR
In this paper, a sulfurous gas stream comprising hydrogen sulfide and carbon disulfide, such as produced as a byproduct of the rayon-forming process, is processed to recover the components in a useable form.Abstract:
Sulfurous gas streams comprising hydrogen sulfide and carbon disulfide, such as produced as a by-product of the rayon-forming process, are processed to recover the components in a useable form. The gas stream first is contacted with an aqueous sodium hydroxide to dissolve out hydrogen sulfide and some of the carbon disulfide. The dissolved carbon disulfide is driven off from the solution and condensed as a liquid concentrate. Carbon disulfide receiving in the gas stream is recovered, such as by condensation. The aqueous sodium sulfide solution which remains is concentrated and the pH is adjusted, as necessary, to a value at which the sodium sulfide is predominantly in the form of sodium bisulfide. The concentrated sodium bisulfide solution is capable of reuse in the rayon-forming process along with the liquid concentrate of carbon disulfide.read more
Citations
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Patent
Device for recovery of carbon disulfide in viscose fiber production
TL;DR: In this paper, an alkali spray tower, an absorption tower, heat exchanger, desorption tower, a condenser and a gas-liquid separator were used for carbon disulfide recovery in viscose fiber production.
Patent
A method for cleaning viscose production off-gases and catalysts for use in the method
TL;DR: In this paper, a method for cleaning an off-gas from viscose production, essentially containing H2S and CS2, comprises passing the gas through a catalytic reactor containing a direct oxidation type catalyst, such as V2O5 on silica, to convert the gas to elemental sulfur, SO2 or mixtures thereof, either via the oxygen present in the gas or via oxygen added to the gas stream.
Patent
Desulfurating rectifying tower for manufacturing carbon disulfide by virtue of high pressure non-catalytic natural gas method
TL;DR: In this paper, a desulfurating rectifying tower for manufacturing carbon disulfide by virtue of a high pressure non-catalytic natural gas method is described, which belongs to the field of inorganic chemical product production and is composed of parts such as a barrel, an ADV type float valve tray, scatter piled pricking, a grating, a liquid distributor and the like.
References
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Patent
Viscose rayon spinning machine
Charles J. Geyer,Ben E. White +1 more
TL;DR: In this article, an approach for spinning viscose rayon comprising an acid bath having an enclosure arranged for substantially completely trapping and collecting any gases emanating from said bath, a plurality of fiber-forming jets disposed substantially along beneath the surface of said acid bath, means for forcing aqueous xanthated alkali cellulose in liquid form into said jets and through said jets upwardly into said bath.
Patent
Gas reacting method
TL;DR: In this paper, a gas reacting apparatus and method for wet mass transfer of solute gases from a gas stream with a liquid or slurry reacting medium capable of chemisorption of solutes in the gas stream is described.
Patent
Apparatus for continuous xanthation and production of viscose spinning solution
Charles J. Geyer,Ben E. White +1 more
TL;DR: In this article, a continuous feed of alkali cellulose (AKC) is partially xanthated, and then dissolved and further Xanthated to form a viscose solution, while passing continuously through a series of connected reactors and slurry vessels, wherein slurries of carbon disulfide (CS2) and alkali metal hydroxide are maintained.
Patent
Method and device for desulfurizing waste gas from boiler or the like
Toshiaki Miyauchi,Masao Numazaki +1 more
TL;DR: In this article, the authors proposed to maintain the effective chemicals at high concn by separating the desulfurization process into two stages, bringing waste gas into contact with an liq absorbent in the second stage, circulating and using the liq and supplying a part of the LIQ absorbent obtained in a second stage to the first stage.
Patent
Process for the preparation of viscose and process for the spinning of the viscose thus obtained
Angelini Gianfranco,Paoletti Ugo +1 more
TL;DR: In this paper, a viscose rayon continuous spinning process is described, which eliminates the need for the usual desulphuration phase for decreasing the sulphur content and for bleaching the product.