Regeneration of an aqueous inorganic thiocyanate solution

The sulphate ion content of an inorganic thiocyanate solution supersaturated in an inorganic sulphate is reduced by passing the solution through a slurried bed of a sulphate salt. The sulphate salt in the bed may be the same salt as the inorganic sulphate in the solution, while the sulphate in solut...

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1. Verfasser:	REEDER FRANK
Format:	Patent
Sprache:	eng
Schlagworte:	AMMONIA APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOSITIONS BASED THEREON COMPOUNDS THEREOF CYANOGEN GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INORGANIC CHEMISTRY MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SPINNING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
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Beschreibung
Zusammenfassung:	The sulphate ion content of an inorganic thiocyanate solution supersaturated in an inorganic sulphate is reduced by passing the solution through a slurried bed of a sulphate salt. The sulphate salt in the bed may be the same salt as the inorganic sulphate in the solution, while the sulphate in solution may have the same cation as the thiocyanate, e.g. sodium. The thiocyanate solution may be at an elevated temperature, e.g. 41 DEG C., and after passing through the bed may be passed through a zone of minimum turbulence, so as to settle entrained solid sulphate, and filtered or centrifuged to free it of solid. The thiocyanate solution may have been concentrated, to produce a supersaturated solution, before treatment and may be diluted afterwards. An apparatus for the continuous removal of sodium sulphate from a sodium thiocyanate solution containing it at supersaturation level has a port 8 for the introduction of sulphate salt into tank 1 while the supersaturated solution is continuously introduced through inlet 9. Rotating shaft 5 mixes by distributer disc 10 and flat scraper 11 prevents blocking of inlet 9 by sulphate. Baffles 12 above the mixing bed reduce the flow of liquid after it has passed through the bed while treated solution passes through slots 13 disposed in a ring around the vessel and enclosed by an annular overflow channel 14, from which the solution drains continuously via outlet pipe 15. Specifications 796,294, 824,361 and 864,096 are referred to.ALSO:Spent thiocyanate solution from acrylonitrile polymerization supersaturated in an inorganic sulphate is treated to reduce the sulphate ion content by passing the solution through a slurried bed of a sulphate salt. The sulphate in solution may have the same cation as the thiocyanate, and the sulphate in the main bed may be the same salt as the inorganic sulphate in supersaturated solution. Sodium sulphate is specified while the thiocyanate solution may be at an elevated temperature. Specifications 796,294, 824,361 and 864,096 are referred to.