§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3929415A Expired / Lapsed US ⏱️ 0.0 years remaining

{68 -Aluminum fluoride by evaporating aqueous MF solution of AlF{HD 3 {B under vacuum to dryness and heating

Assignee: Daikin Industries Ltd
•
Filing: 1974-07-22
•
Granted: 1975-12-30
•
Expires: 1994-07-22
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Process for hydrofluorinating acetylene which comprises reacting acetylene with hydrogen fluoride in the vapor phase and in the presence of Epsilon -aluminum fluoride at a temperature from about 200* to about 380*C to produce vinyl fluoride and 1,1difluoroethane, and Epsilon -aluminum fluoride being prepared by evaporating an aqueous hydrofluoric acid solution of aluminum fluoride to dryness at a temperature from 30* to 120*C optionally followed by heating the resulting product at a temperature from 120* to 500*C.

Inventors

  • 👤 Hiroyuki Wada
  • 👤 Yasumasa Kawakami
  • 👤 Tutomu Kamihigoshi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 18:49
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/50; B; B01; B01J; B01J27/00; B01J27/06

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 97 words
A METHOD FOR PREPARING E-ALUMINUM FLUORIDE, CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN WITH PEAKS AT ANGELS OF DIFFRACTION OF 8.1* (VERY STRONG), 18.8* (STRONG), 24.8* (VERY STRONG), 26.4* (STRONG), 28.1* (STRONG) AND 50.8* (STRONG) WITH SPACINGS IN A OF 10.915A, 4.719A, 3.590A, 3.370A, 3.175A AND 1.797A, RESPECTIVELY, FOR EACH ANGLE NOTED, AND HAVING THE EMPIRICAL FORMULA AIF3.1.5 H2O, WHICH COMPRISES EVAPORATING UNDER VACUUM AN AQUEOUS HYDROFLUORIC ACID SOLUTION OF ALUMINUM FLUORIDE TO DRYNESS AT A TEMPERATURE FROM 30* TO 120*C AND HEATING THE RESULTING PRODUCT OF THE EVAPORATION TO A TEMPERATURE OF FROM ABOVE 120* TO 500*C.
Claim 2
Independent Claim 97 words
A METHOD FOR PREPARING E-ALUMINUM FLUORIDE, CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN WITH PEAKS AT ANGELS OF DIFFRACTION OF 8.1* (VERY STRONG), 18.8* (STRONG), 24.8* (VERY STRONG), 26.4* (STRONG), 28.1* (STRONG) AND 50.8* (STRONG) WITH SPACINGS IN A OF 10.915A, 4.719A, 3.590A, 3.370A, 3.175A AND 1.797A, RESPECTIVELY, FOR EACH ANGLE NOTED, AND HAVING THE EMPIRICAL FORMULA AIF3.1.5 H2O, WHICH COMPRISES EVAPORATING UNDER VACUUM AN AQUEOUS HYDROFLUORIC ACID SOLUTION OF ALUMINUM FLUORIDE TO DRYNESS AT A TEMPERATURE FROM 30* TO 120*C AND HEATING THE RESULTING PRODUCT OF THE EVAPORATION TO A TEMPERATURE OF FROM ABOVE 120* TO 500*C.
Claim 3
Independent Claim 94 words
A method for preparing epsilon -aluminum fluoride characterized by an X-ray diffraction pattern with peaks at angles of diffraction at 10.2* (very strong), 18.8* (strong), 23.7* (weak), 24.9* (very strong), 28.1* (strong) and 50.8* (medium) with spacings in A of 8.672A, 4.719A, 3.754A, 3.561A, 3.175A and 1.797A, respectively, for each angle noted, and having the empirical formula AlF3.0.5 H2O, wherein an aqueous hydrofluoric acid solution of aluminum fluoride is evaporated under vacuum to dryness at a temperature from 30* to 120*C and the resulting product is heated at a temperature from 140* to 200*C.
Claim 4
Independent Claim 94 words
A method for preparing epsilon -aluminum fluoride characterized by an X-ray diffraction pattern with peaks at angles of diffraction at 10.2* (very strong), 18.8* (strong), 23.7* (weak), 24.9* (very strong), 28.1* (strong) and 50.8* (medium) with spacings in A of 8.672A, 4.719A, 3.754A, 3.561A, 3.175A and 1.797A, respectively, for each angle noted, and having the empirical formula AlF3.0.5 H2O, wherein an aqueous hydrofluoric acid solution of aluminum fluoride is evaporated under vacuum to dryness at a temperature from 30* to 120*C and the resulting product is heated at a temperature from 140* to 200*C.
Claim 5
Independent Claim 101 words
A method for preparing epsilon -aluminum fluoride, characterized by an X-ray diffraction pattern with peaks at angles of diffraction at 11.8* (medium), 18.8* (medium), 22.3* (medium), 25.0* (very strong), 28.1* (medium) and 51.4* (medium) with spacings in A of 7.499A, 4.719A, 3.986A, 3.561A, 3.175A and 1.777A, respectively, for each angle noted, and having the empirical formula AlF3, which comprises evaporating under vacuum an aqueous hydrofluoric acid solution of aluminum fluoride to dryness at a temperature from 30* to 120*C, and heating the resulting product first at a temperature from 140* to 200*C and then at a temperature from 240* to 400*C.
Claim 6
Independent Claim 101 words
A method for preparing epsilon -aluminum fluoride, characterized by an X-ray diffraction pattern with peaks at angles of diffraction at 11.8* (medium), 18.8* (medium), 22.3* (medium), 25.0* (very strong), 28.1* (medium) and 51.4* (medium) with spacings in A of 7.499A, 4.719A, 3.986A, 3.561A, 3.175A and 1.777A, respectively, for each angle noted, and having the empirical formula AlF3, which comprises evaporating under vacuum an aqueous hydrofluoric acid solution of aluminum fluoride to dryness at a temperature from 30* to 120*C, and heating the resulting product first at a temperature from 140* to 200*C and then at a temperature from 240* to 400*C.
Claim 7
Dependent Claim 33 words
A method for preparing epsilon -aluminum fluoride according to claim 3, wherein said aqueous hydrofluoric acid solution of aluminum fluoride is evaporated under vacuum to dryness at a temperature from 90* to 100*C.
Claim 8
Dependent Claim 9 words
epsilon 1-aluminum fluoride prepared by the process of claim
Claim 9
Dependent Claim 10 words
epsilon 2-aluminum fluoride prepared by the process of claim 2.
Claim 10
Dependent Claim 11 words
epsilon 3-aluminum fluoride and prepared by the process of claim 3.

References Cited (Backward Citations)

US1036453A Cited
US1851475A Cited
US2258412A Cited
US2454921A Cited
US2540493A Cited
US2681267A Cited
US3057681A Cited
US3385658A Cited
US3432441A Cited
US3492086A Cited
US3473887A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-12-29 1979-06-30 1979-12-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-12-29 1983-06-30 1983-12-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-12-29 1987-06-30 1987-12-30 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag