- Due to different source of Maleic Acid – pure Maleic Anhydride or Off Gases containing Maleic Anhydride having source in Maleic or Phthalic anhydride production process the final quality of the product is highly influenced.
- Generally the process originated with pure Maleic anhydride is able to produce “food grade” quality of fumaric acid.
- For a difference in quantity of by products contained in the off gases of Maleic or Phthalic anhydride production process the process starting with Maleic anhydride in Off gases is able to produce only “technical grade” quality of fumaric acid. With additional purifying unit is however possible to assure the “food grade” quality also in this case.
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