The existing problems: the commonly used solid acid catalysts, such as molecular sieve and solid super acid, will poison and inactivate the acid center in case of water, and the esterification reaction will inevitably produce water, resulting in the common solid acid catalyst should not be used in the esterification reaction.

    Expected results: develop a new solid acid catalyst for catalytic esterification, conversion rate ≥ 99.95%, selectivity ≥ 99.0%, realize the recovery and recycling of solid acid catalyst, catalyst recycling at least 15 times, comprehensive cost should not exceed the traditional catalyst, environment-friendly.