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1. (WO1997018158) MANUFACTURE OF VERY LOW ARSENIC HYDROGEN FLUORIDE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/018158 International Application No.: PCT/US1996/017924
Publication Date: 22.05.1997 International Filing Date: 08.11.1996
Chapter 2 Demand Filed: 16.04.1997
IPC:
C01B 7/19 (2006.01)
C CHEMISTRY; METALLURGY
01
INORGANIC CHEMISTRY
B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
7
Halogens; Halogen acids
19
Fluorine; Hydrogen fluoride
Applicants:
ALLIEDSIGNAL INC. [US/US]; 101 Columbia Road P.O Box 2245 Morristown, NJ 07962-2245, US
Inventors:
KUNKEL, Paul, Frederick; US
REDMON, Charles, Lewis; US
SUBBANNA, Somanahalli, Naranappa; US
Agent:
CRISS, Roger, H.; AlliedSignal Inc. Law Dept. (C.A. McNally) 101 Columbia Road P.O. Box 2245 Morristown, NJ 07962-2245, US
GIANNESCHI, Lois; AlliedSignal Inc. (Law Department, Attn.: C.A. McNally) 101 Columbia Road P.O. Box 2245 Morristown, NJ 07962-2245, US
Priority Data:
08/555,65913.11.1995US
Title (EN) MANUFACTURE OF VERY LOW ARSENIC HYDROGEN FLUORIDE
(FR) PRODUCTION DE FLUORURE D'HYDROGENE A TRES FAIBLE TENEUR EN ARSENIC
Abstract:
(EN) The invention provides a process for the preparation of hydrogen fluoride having a very low arsenic level. More specifically, the invention provides a process in which industrial grade anhydrous hydrogen fluoride, or an intermediate product obtained during the hydrogen fluoride manufacturing process, is contacted with an oxidizer in order to oxidize the arsenic impurity to produce anhydrous hydrogen fluoride with a level of arsenic impurity that is at least less than two parts per billion, or aqueous hydrogen fluoride with a correspondingly low level of arsenic.
(FR) L'invention se rapporte à un procédé de préparation de fluorure d'hydrogène à très faible teneur en arsenic. L'invention se rapporte plus spécifiquement à un procédé dans lequel le fluorure d'hydrogène anhydre de qualité industrielle, ou un produit intermédiaire obtenu au cours du processus de production du fluorure d'hydrogène, est mis en contact avec un agent d'oxydation afin d'oxyder les impuretés d'arsenic et d'obtenir un fluorure d'hydrogène anhydre dont le taux d'arsenic est au moins inférieur à deux parts par milliard, ou un fluorure d'hydrogène aqueux dont le taux d'arsenic est proportionnellement faible.
Designated States: AL, AU, BB, BG, BR, CA, CN, CU, CZ, EE, GE, IL, IS, JP, KP, KR, LK, LR, LS, LT, LV, MG, MK, MN, MW, MX, NZ, PL, RO, RU, SD, SG, SI, SK, TR, TT, UA, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
MXPA/a/1998/003559SG53590EP0879211AU1996076107