Recovery of anhydrous acids

Details Recovery of anhydrous acids Recovery of anhydrous acids

1996-12-26

1999-02-23

Manoharan, Virginia

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 65, 203 89, 159 49, 159DIG19, 562124, B01D 122, B01D 336, C07C 6974

Patent

active

058739815

ABSTRACT:
A is a process for removing water from an alkanesulfonic acid such as methanesulfonic acid or ethanesulfonic acid by mixing an azeotropic excess of a phenolic compound with water and the alkanesulfonic acid, then boiling off substantially all of the water, and leaving as a remnant substantially all the alkanesulfonic acid and some of the phenol. This process is particularly useful for recycling an alkanesulfonic acid for a reaction which requires the phenolic compound as one of the reagents. One such reaction is the alkanesulfonic acid catalyzed condensation reaction of a phenolic compound with an .alpha.haloketone to form a chlorinated intermediate of a dihydroxy-.alpha.-alkylstilbene such as 4,4'-dihydroxy-.alpha.-alkylstilbene (DHAMS).

REFERENCES:
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patent: 2711388 (1955-06-01), Mottern et al.
patent: 4450047 (1984-05-01), Malzahn
patent: 4938846 (1990-07-01), Cornstock et al.
patent: 5258554 (1993-11-01), Langer et al.
patent: 5475155 (1995-12-01), Hefner, Jr. et al.

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