Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Patent
1983-04-15
1987-09-08
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
C07C11800
Patent
active
046925503
ABSTRACT:
N-monosubstituted carbamic acid esters are thermally split on a continuous basis in a tube reactor. The carbamic acid ester which is flowed down or passed over the inner wall of a tube reactor is thermally split at a temperature of from 150.degree. to 450.degree. C. and under a pressure of from 0.001 to 20 bar into at least two fractions. One fraction is predominantly isocyanate and a second fraction is predominantly hydroxyl compound. These fractions may be separated by removing one as a gaseous fraction formed under the splitting conditions from the head of the reactor and collecting the second fraction as a liquid which accumulates at the base of the reactor. If both fractions are gaseous under the splitting conditions, they are both removed from the head of the reactor and subsequently separated by fractionating columns for example. This process is particularly advantageous in that isocyanate and hydroxyl fractions are obtained in high yield without using a solvent.
REFERENCES:
patent: 2409712 (1946-10-01), Schweitzer
patent: 2692275 (1954-10-01), Bortnick
patent: 2713591 (1955-07-01), Bortnick
patent: 2727020 (1955-12-01), Melamed et al.
patent: 3734941 (1973-05-01), Sydor
patent: 3870739 (1975-03-01), DeLaMater et al.
patent: 3919278 (1975-11-01), Rosenthal et al.
patent: 3919279 (1975-11-01), Rosenthal et al.
patent: 3919280 (1975-11-01), Rosenthal et al.
patent: 3962302 (1976-06-01), Rosenthal et al.
patent: 4081472 (1978-03-01), Tsumura et al.
patent: 4294774 (1981-10-01), Henson et al.
patent: 4386033 (1983-05-01), Konig et al.
A. W. Hoffmann, Berichte der Deutschen Chemischen Gesellschaft, vol. 3, pp. 653 et seq. (1870).
M. Metayer, Bull. Soc. Chim. France, (1951), pp. 802 et seq.
H. Schiff, Berichte der Deutschen Chemischen Gesellschaft, vol. 3, pp. 649 et seq. (1870).
E. Dyer & G. C. Wright, J. Amer. Chem. Soc., vol. 81, (1959), pp. 2138 et seq.
Abbate et al., Journal of Applied Polymer Science, vol. 16, 1972, p. 1213.
Engbert Theodor
Hammen Gunter
Knofel Hartmut
Konig Klaus
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Siegel Alan
Whalen Lyndanne M.
LandOfFree
Continuous process for thermal splitting of carbamic acid esters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous process for thermal splitting of carbamic acid esters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous process for thermal splitting of carbamic acid esters will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2159215