Process for the preparation of polysuccinimide
AssigneeBayer Aktiengesellschaft
InventorsTorsten Groth, Winfried Joentgen, Dorde Jovcic, Paul Wagner, Hans-Joachim Traenckner
Life of this patent
Estimating the term…
Abstract
The invention relates to an improved process for the preparation of polysuccinimide from maleic anhydride and ammonia, characterized in that the starting compounds are brought to reaction in liquid form in a tubular reactor with feed nozzle at temperatures of preferably 50.degree. C. to 500.degree. C. and residence times of preferably 0.1 to 600 seconds and the resulting reaction mixture is possibly further polymerized thermally in a high-viscosity reactor preferably continuously operated at 120.degree. C. to 300.degree. C.
Claims21
Process for the preparation of polysuccinimide from maleic acid anhydride and ammonia, comprising:
- mixing or emulsifying a primary component consisting of a) maleic acid anhydride or b) maleic acid anhydride and water or a solvent, with a secondary component consisting of a) ammonia or b) ammonia and water or a solvent, in a tubular reactor, wherein said primary component is introduced into said secondary component from a nozzle in said tubular reactor.
Process for the preparation of polyasparagine from maleic anhydride and ammonia, comprising:
- mixing or emulsifying a primary component consisting of a) maleic anhydride;
- or b) maleic anhydride and water or a solvent, with a secondary component consisting of a) ammonia;
- or b) ammonia and water or a solvent, in a tubular reactor at a molar excess of ammonia, wherein said primary component is introduced into said secondary component from a nozzle in said tubular reactor.
Process for the preparation of polysuccinimide comprising:
- a) passing a secondary component through a tubular reactor;
- b) mixing a primary component with said secondary component by injecting said primary component into said secondary component from a nozzle located within said tubular reactor;
- and
- c) reacting said primary component with said secondary component;
- wherein said primary component consists of a) maleic acid anhydride;
- or b) maleic acid anhydride and water or a solvent, and said secondary component consists of a) ammonia;
- or b) ammonia and water or a solvent.
Process for the preparation of polysuccinimide comprising:
- a) passing a secondary component through a tubular reactor;
- b) mixing a primary component with said secondary component by injecting said primary component into said secondary component from a nozzle located within said tubular reactor;
- and
- c) reacting said primary component with said secondary component;
- wherein said secondary component consists of a) maleic acid anhydride;
- or b) maleic acid anhydride and water or a solvent, and said primary component consists of a) ammonia;
- or b) ammonia and water or a solvent.
Dependencies are inferred from the claim text.