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US 10,703,709 B2Granted
Method for producing aniline or an aniline conversion product
AssigneeCovestro Deutschland AG
InventorsGernot Jäger, Thomas Hamedinger, Giulio Lolli, Amgad Salah Moussa, Guenter Olf
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Abstract
The invention relates to a method for producing aniline or products that are obtained by further chemical reaction of aniline (aniline derivatives), involving decarboxylation of aminobenzoic acid, particularly ortho-aminobenzoic acid, in which one portion of the previously formed crude aniline is recirculated in the decarboxylation step. The aminobenzoic acid is obtained enzymatically or chemically, preferably enzymatically.
Claims18
A method for producing aniline or an aniline conversion product, comprising:
- (I) decarboxylating aminobenzoic acid to aniline in a reactor in the presence of a catalyst, wherein a stream containing aniline is withdrawn from the reactor;
- (II) purifying a portion of the stream containing aniline withdrawn in step (I) to obtain aniline;
- (III) recirculating another portion of the stream containing aniline withdrawn in step (I) into the reactor of step (I);
- and
- (IV) optionally further reacting the aniline purified in step (II) to give an aniline conversion product.
2 more elements
Dependencies are inferred from the claim text.