Process for depolymerization of polyacrylonitrile using hot wate

Details Process for depolymerization of polyacrylonitrile using hot wate Process for depolymerization of polyacrylonitrile using hot wate

1991-12-20

1994-05-17

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528499, C08F 600

Patent

active

053128982

ABSTRACT:
The present invention relates to a process for depolymerizing polyacrylonitrile into water soluble by-products, including ammonia and lower molecular weight carbonaceous materials by contacting the starting materials, polyacrylonitrile, and neutral, hot liquid water at a temperature from about 200.degree. C. up to the critical temperature of water at autogenous pressure. The present invention has utility as a means for degrading polyacrylonitrile without producing toxic hydrogen cyanide as a by-product.

REFERENCES:
patent: 2846423 (1958-08-01), Hartmann
patent: 3083193 (1963-03-01), Kolner
patent: 3416874 (1968-12-01), Robin
patent: 3673129 (1972-06-01), Sagane et al.
Prince, M. et. al., "High Pressure Reactions. III. Hydrolysis of Polyacrylonitrile." J. Polymer Science: A-1, vol. 5, 161-169(1967).
European Patent Search Report for Application No. 92311505.9, Communication dated Feb. 19, 1993.
Hay, "Thermal Reactions of Polyacrylonitrile" in J. Polymer Sc., Part A-1, vol. 6, 1968, Birmingham, Engl., pp. 2127-2135.
Monahan, J. Polymer Sc., Part A-1, vol. 4, 1966, Rochester, N.Y., "Thermal Degradation of Polyacrylonitrile in the Temperature Range of 280.degree.-450.degree. C.", pp. 2391-2399.

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