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Recovery of HF from aqueous streams 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • C01B-007/19
출원번호 US-0338935 (1994-11-14)
발명자 / 주소
  • Chang Chin-Hsiung (Palatine IL) Gualdron Miguel A. (Skokie IL)
출원인 / 주소
  • AlliedSignal Inc. (Morris County NJ 02)
인용정보 피인용 횟수 : 6  인용 특허 : 17

초록

HF can be recovered from aqueous streams, particularly those which are dilute and have a concentration of HF lower than the azeotrope between HF and water. Such aqueous streams are contacted with carbon molecular sieves, preferably those having an average pore size of about 3.5 Angstroms, which adso

대표청구항

A method of recovering HF from aqueous streams comprising the steps of: (a) contacting said aqueous stream containing HF with a carbon molecular sieve and adsorbing both HF and water in pores of said carbon molecular sieve; (b) heating said carbon molecular sieve containing substantially all the HF

이 특허에 인용된 특허 (17)

  1. Foley Henry C. (Newark DE) Mariwala Ravindra K. (Newark DE) Manzer Leo (Wilmington DE), Carbon molecular sieve for the kinetic separation of acid gases and fluorocarbons.
  2. Chang Chin-Hsiung (Palatine IL), Carbon molecular sieves for purification of chlorofluorocarbons.
  3. Rao V. N. Mallikarjuna (Wilmington DE) Weigert Frank J. (Wilmington DE) Krespan Carl G. (Wilmington DE), Gem-dihydropolyfluoroalkanes and monohydropolyfluoroalkenes, processes for their production, and use of gem-dihydropolyf.
  4. Brggendick Hermann (Schermbeck DEX), Method and arrangement for purifying a carbon-containing adsorption medium.
  5. van Eijl A. Theodorus (Terneuzen NL), Method of recovering HF from mixtures containing C1-C3 halocarbon compounds.
  6. Walker John D. (Baton Rouge LA) Reed Darrell B. (Baton Rouge LA), Novel calcium chloride scrubbing bath.
  7. Chang Chin-Hsiung (Palatine IL) Seminara Gary J. (Chicago IL), Preparation of hydrophobic carbon molecular sieves.
  8. Tahara Hiroshi (Kawasaki JPX), Process for processing a waste etching solution containing a fluorine component and an ammonia component to recover valu.
  9. Van der Meer Arie (Helsinki FI) Lepomaa Lauri A. (Espoo FI), Process for producing hydrogen fluoride from an aqueous solution of hydrogen fluoride and sulfuric acid.
  10. Jacobson Stephen E. (Princeton Junction NJ), Process for producing trifluoroacetyl chloride.
  11. Echigo Yoshiaki (Uji JPX) Amimoto Hirotaka (Uji JPX) Yamao Mutsunori (Uji JPX) Ishikura Tadashi (Uji JPX) Otomura Keiichiro (Kurayoshi JPX) Fujisaki Sakae (Okayama JPX) Ogura Yoshikazu (Kurayoshi JPX, Process for separately recovering uranium and hydrofluoric acid from waste liquor containing uranium and fluorine.
  12. Hopp Peter (Hofheim am Taunus DEX) Wirth Uwe (Mainhausen DEX), Process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluorop.
  13. Mani Krishnamurthy N. (Denville NJ) Chlanda Frederick P. (Rockaway NJ), Process for the recovery of anhydrous hydrogen fluoride from aqueous solutions of fluosilicic acid and hydrogen fluoride.
  14. Kirsch, Warren B.; Laurent, Sebastian M., Purification of halide.
  15. Mizrahi Joseph (Haifa ILX), Recovery of hydrogen fluoride from an aqueous solution containing ammonium fluoride and hydrogen fluoride.
  16. Merchant Dhirendra Ranchhoddas (Paducah KY) Hodges Jimmie Ray (Benton KY), Removal of hydrogen fluoride from gaseous mixture by absorption on alkaline earth metal fluoride.
  17. Soffer Abraham (38 Moav St. Arad ILX) Koresh Jacob E. (10 Zeela Street Beer Sheva ILX) Saggy Shlomo (3 Moria Street Beer Sheva ILX), Separation device.

이 특허를 인용한 특허 (6)

  1. Lamb Louis J., Apparatus and method for producing HF from phosphate rock.
  2. Jangbarwala, Juzer, Fluorine removal by ion exchange.
  3. Anilkumar C. Bhatt ; Jerome J. Wagner, Method for recovering an organic solvent from an acidic waste stream such as in integrated chip manufacturing.
  4. King,Mackenzie, Methods for removing moisture from hydrogen halides.
  5. Mason,Cashman R. S.; Harlamovs,Juris R.; Dreisinger,David B.; Grinbaum,Baruch, Solvent extraction of a halide from a aqueous sulphate solution.
  6. Dong Chun Christine ; Schwarz Alexander ; Roth Dean V. ; Christman Delbert D., Vacuum preparation of hydrogen halide drier.

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