| http://www.w3.org/ns/prov#value | - The water may then be removed from the process and the MCHM returned or recycled to the esterification reaction zone of step (i).The esterification reaction may be carried in the presence or absence of an exogenous esterification catalyst, i.e., a catalyst other than terephthalic acid, that is added to the reaction mixture for the purpose of increasing the rate of the esterification reaction.
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