Action for partial dissolution of a company. Determination of the withdrawing partner's equity interest in arbitration. Challenge to the enforcement of the arbitration award. Allegation of violation of article 32 of the Brazilian Arbitration Act, based on an alleged extra petita judgment, judgment in equity and the adoption of an improper methodology for determining the equity interest (discounted cash flow). Not established. Arbitration award that merely adapts the contractual clauses to the reality of the litigation, observing the limits of the arbitration agreement and due process of law. Impossibility of reviewing the appraisal criterion and the payment terms established by the arbitration tribunal: