Process for producing alkali metal salts of aromatic polycarboxylic acids
AssigneePhillips Petroleum Company
InventorFred T. Sherk
Life of this patent
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Abstract
The effluent of a disproportionation reactor comprising alkali metal salts of aromatic polycarboxylic acids and a dispersant is flash evaporated so as to separate the effluent into a vapor phase comprising the vaporized dispersant and a solid phase comprising the alkali metal salts of the aromatic polycarboxylic acids.
Claims9
In a process for producing alkali metal salts of aromatic polycarboxylic acids wherein an alkali metal salt of an aromatic carboxylic acid and a dispersant are introduced into a disproportionation zone, said alkali metal salt of said aromatic carboxylic acid is disproportionated at elevated temperature and high pressure conditions whereby there is formed a slurry comprising said alkali metal salts of said aromatic polycarboxylic acid and said dispersant and a gaseous effluent and wherein said alkali metal salts and said dispersant are separated,
- the improvement which comprises
- a. treating said slurry in a concentration zone and increasing the solids content of said slurry;
- b. combining said slurry having an increased content of solids with said gaseous effluent from said reaction zone,
- c. passing said slurry combined with said gaseous effluent to a separation zone;
- d. suddenly lowering the high pressure of said slurry combined with said gaseous effluent to a pressure of about 10 to 100 psia,
- e. recovering said dispersant as a vapor from said separation zone, and
- f. recovering said alkali metal salts of said polycarboxylic acids as solids from said separation zone.
Dependencies are inferred from the claim text.