How many industrial production processes are there for maleic anhydride?

Preparation Methods
Currently, there are two main industrial production processes for Maleic Anhydride:
Benzene oxidation process: Using benzene as the raw material, maleic anhydride is produced via air oxidation under the presence of a catalyst. This process is widely adopted in China.
n-Butane oxidation process: Maleic anhydride is generated via air oxidation of n-butane with a catalyst. This process is divided into fixed-bed and fluidized-bed technologies based on the reactor type. For the post-treatment section, two technical methods are used: water absorption and solvent absorption.

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