Aged molten color of maleic anhydride

Details Aged molten color of maleic anhydride Aged molten color of maleic anhydride

1979-12-26

1981-04-07

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30760

Patent

active

042605466

ABSTRACT:
The oxidation of butane vapor with air produces an impure maleic anhydride which when fractionated to first remove materials boiling lower than maleic anhydride and then a maleic anhydride product, leads to a maleic anhydride product fraction which when held at 140.degree. C. for 90 minutes discolors and is not a commercially acceptable product. Such discoloration can be substantially reduced by maintaining the impure maleic anhydride at a temperature from 60.degree. up to 200.degree. C. in the presence of small amounts of either hydrogen peroxide and/or sulfuric acid.

REFERENCES:
patent: 3564022 (1971-02-01), Manoff et al.
patent: 3939183 (1977-02-01), Gardner et al.

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