Method for conditioning catalysts by means of membrane filtration

摘要

The present invention relates to a method of conditioning suspended catalysts, wherein at least part of the catalyst-comprising reaction medium is taken from one or more reactors and the suspended, at least partially inactivated catalysts are separated off and purified by means of at least one membrane filtration, with at least one of the membrane filtrations being carried out as a diafiltration.

主权项

1. A method, comprising:
removing at least part of a reaction medium from one or more reactors to obtain a removed reaction medium in a circulation vessel, said reaction medium comprising a suspension of completely or partially inactivated catalyst and at least one of a reaction product and a reaction starting material; and subjecting the removed reaction medium to at least one membrane filtration in a membrane filter, thereby separating and purifying the completely or partially inactivated catalyst, to obtain an aqueous catalyst suspension comprising the completely or partially inactivated catalyst, wherein: the at least one membrane filtration includes at least one diafiltration in which a diafiltration medium is added to a retentate side of the membrane filter during membrane filtration, such that the addition of the diafiltration medium does not alter a concentration of the completely or partially inactivated catalyst in the circulation vessel; and a composition of the diafiltration medium is different from a composition of the reaction medium, the diafiltration occurs in the presence of at least one auxiliary added to the suspension; and the suspension prior to the at least one membrane filtration has a catalyst concentration above a limit concentration, such that the presence of the at least one auxiliary is effective to increase permeate flux while increasing catalyst concentration in the retentate beyond amounts achieved in the absence of the at least one auxiliary.