Maleic anhydride process

Details Maleic anhydride process Maleic anhydride process

1983-06-29

1986-01-21

Jiles, Henry H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549262, C07D30760

Patent

active

045658803

ABSTRACT:
It has been found that phosphoric acid alone and in admixture with phenothiazine and/or methyl-p-benzoquinone reduces residue formed during the fractionation of aqueous crude maleic compositions for the production of maleic anhydride, and in particular, reduces residue due to the presence of small amounts, i.e., less than 10 ppm alkali metal ion. When the alkali metal ion is present at least 9 equivalent acid groups of phosphoric acid per atomic equivalent of alkali metal ion are present.

REFERENCES:
patent: 2134531 (1938-10-01), Punnett
patent: 2343536 (1944-03-01), Crowell
patent: 2509873 (1950-05-01), McAteer
patent: 2863880 (1958-12-01), Kohn

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