Patent US4417964A successfully refreshed from Google Patents.
US4417964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing olefinic compounds
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
•
Filing: 1982-11-02
•
Granted: 1983-11-29
•
Expires: 2002-11-02
Abstract
Abstract A method of preparing compounds having at least one olefinic double bond, which method comprises irradiating the corresponding saturated halogenated compound in gaseous form, with pulsed coherent light or incoherent light, adjusting the wavelength of the irradiated light and the pressure and temperature conditions so that a captured cross-section of 10-15 to 10-25 cm2 per molecule results, to split off hydrogen halide from said corresponding saturated compound yielding said olefinic compound.
Inventors
- 👤 Jurgen Wolfrum
- 👤 Michael Kneba
- 👤 Peter N. Clough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:45
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/121; C; C07; C07C; C07C17/00; C07C17/25; B01J2219/00; B01J2219/08; B01J2219/0873; B01J2219/0881; B01J2219/0883
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
79 words
Method of preparing a compund having at least one olefinic double bond, which method comprises initiating a chain reaction by irradiating the corresponding saturated halogenated compound in gaseous form, with pulsed coherent light or incoherent light, adjusting the wavelength of the irradiated light and the pressure and temperature conditions so that a capture cross-section of 10 -15 to 10 -25 cm 2 per molecule results, to split off hydrogen halide from said corresponding saturated compound yielding said olefinic compound.
Claim 2
Dependent Claim
79 words
Method of preparing a compund having at least one olefinic double bond, which method comprises initiating a chain reaction by irradiating the corresponding saturated halogenated compound in gaseous form, with pulsed coherent light or incoherent light, adjusting the wavelength of the irradiated light and the pressure and temperature conditions so that a capture cross-section of 10 -15 to 10 -25 cm 2 per molecule results, to split off hydrogen halide from said corresponding saturated compound yielding said olefinic compound.
Claim 3
Dependent Claim
29 words
Method as claimed in claim 1 wherein radiation is used having a pulse duration of down to 10 31 15 seconds and an energy of 0.01 to 100 Joules.
Claim 4
Dependent Claim
27 words
Method as claimed in claim 1 wherein the capture cross-section is regulated by the addition of small amounts of more highly halogenated compounds, hydrogen halide or halogen.
Claim 5
Dependent Claim
17 words
Method as claimed in claim 1 wherein said saturated halogenated compound is dichloroethane, to produce vinyl chloride.
Claim 6
Dependent Claim
17 words
Method as claimed in claim 4 wherein a temperature from 200° C. to 600° C. is used.
Claim 7
Dependent Claim
22 words
Method as claimed in claim 5 wherein coherent light is used and a temperature of 230° C. to 350° C. is applied.
Claim 8
Dependent Claim
22 words
Method as claimed in claim 5 wherein incoherent light is used and a temperature of 450° C. to 550° C. is applied.
Claim 9
Dependent Claim
17 words
Method as claimed in claim 4 wherein a pressure of from 50 to 3000 kPa is applied.
Claim 10
Dependent Claim
17 words
Method as claimed in claim 8 wherein a pressure of from 0.1 and 1 MPa is applied.
Claim 11
Dependent Claim
26 words
Method as claimed in claim 4 wherein oxygen or nitromethane is added to the dichloroethane at a partial pressure of between 1 Pa and 6.5 kPa.
Claim 12
Dependent Claim
17 words
Method as claimed in claim 10 wherein said oxygen or nitromethane is mixed with an inert gas.
Claim 13
Dependent Claim
29 words
Method as claimed in claim 1 wherein incoherent light is used and a metal vapor medium pressure lamp or low pressure lamp is used as the incoherent light source.
Claim 14
Dependent Claim
17 words
Method as claimed in claim 12 wherein a mercury, thallium or iron metal vapor lamp is used.
Claim 15
Dependent Claim
24 words
Method as claimed in claim 12 wherein said metal vapor lamp has a quantum flux range of from 0.01 to 10 W/cm 2 .
Claim 16
Dependent Claim
24 words
Method as claimed in claim 12 wherein said metal vapor lamp has a quantum flux range of from 0.1 to 2 W/cm 2 .
Claim 17
Dependent Claim
14 words
Method as claimed in claim 1 wherein the reactant flows through a reaction chamber.
Claim 18
Dependent Claim
25 words
Method as claimed in claim 1 wherein said temperature conditions comprise a thermal treatment, and said thermal treatment and said irradiation are performed successively step-wise.
Claim 19
Dependent Claim
19 words
Method as claimed in claim 17 wherein one or more of said thermal treatment and irradiation steps are repeated.
Claim 20
Dependent Claim
21 words
Method as claimed in claim 18 comprising the following steps (a) thermal treatment; (b) irradiation; (c) thermal treatment; and (d) irradiation.
Claim 21
Dependent Claim
18 words
Method as claimed in claim 18 wherein successive irradiation steps operate alternately with coherent light and incoherent light.
References Cited (Backward Citations)
US4124466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |