Ripening of 1,4-bis (4-phenoxybenzoyl)benzene

A method for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, comprising:

• reacting terephthaloyl chloride with diphenyl ether in a reaction solvent and in the presence of a Lewis acid, so as to obtain a product mixture comprising a 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex;
• contacting the product mixture with a protic solvent, so as to obtain a first phase containing the Lewis acid and a second phase containing 1,4-bis(4-phenoxybenzoyl)benzene;
• heating at least the second phase up to a maximum temperature, followed by cooling at least the second phase down to a separation temperature;
• and
• subjecting at least the second phase to a solid/liquid separation step at the separation temperature, so as to recover solid 1,4-bis(4-phenoxybenzoyl)benzene,
• wherein the 1,4-bis(4-phenoxybenzoyl)benzene contained in the second phase is partly dissolved in the second phase at the maximum temperature.