Process for the preparation of maleic anhydride

Details Process for the preparation of maleic anhydride Process for the preparation of maleic anhydride

1985-07-08

1987-04-14

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549256, 549262, C07D30760

Patent

active

046580425

ABSTRACT:
In the production of maleic anhydride, scale formation in an evaporator and pipes is a very difficult problem. By the process disclosed herein, scale formation in a maleic anhydride preparation apparatus can satisfactorily be prevented, and therefore, maleic anhydride preparation apparatus can be operated continuously for a long period. Further, it is also possible to significantly reduce the formation of fumaric acid. The process is that when conducting the concentration and dehydration of an aqueous solution of maleic acid, a small amount of hydrogen peroxide is added to the aqueous solution. Scale is formed by condensation of phenols and aldehydes, and quinones and aldehydes. Hydrogen peroxide added acts to oxidize aldehydes contained in the aqueous solution.

REFERENCES:
patent: 1914556 (1933-06-01), Conover
patent: 3642829 (1972-02-01), Weyens
patent: 4260546 (1981-04-01), Schroeder et al.

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