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US 8,466,320 B2Granted
Method for the recovery of mineral acids from saline solutions
AssigneeBASF SE
InventorsVeronika Wloka, Torsten Mattke, Carsten Knösche, Daniel Breuninger, Nils Bottke
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Abstract
The invention relates to a process for recovering acids from product streams of organic syntheses, which comprises the steps a) neutralization of the acid with a base, b) removal of the base by means of adsorption, c) recovery of the acid.
Claims12
A process for preparing diphenylmethanediamine, comprising:
- A) reacting aniline with formaldehyde in the presence of a mineral acid,
- B) neutralizing the mineral acid with a base, wherein said base is at least one selected from the group consisting of ammonia, a primary amine, a secondary amine, and a tertiary amine,
- C) separating the organic phase and the inorganic phase,
- D) removing the base from the inorganic phase by means of adsorption, wherein an ion exchanger in the H form is used as an adsorbent,
- E) recovering the mineral acid.
2 more elements
Dependencies are inferred from the claim text.