Process for the acylation of an alpha, omega-alkandiol

A process for the acylation of an α,ω-alkanediol, preferably of 1,3-propanediol, with an acylation agent (acylation reaction), said process comprising the step of re-feeding recycled reaction components comprising α,ω-C3-10alkanediol, α,ω-C3-10alkanediol monoacylate and α,ω-C3-10alkanediol diacylate back into said acylation reaction and with the proviso that in said acylation reaction per mole recycled acylate groups 0.5 to 1.5 mole of water is added, and that the molar ratio of the (molar) sum of the acylating agent, α,ω-C3-10alkanediol monoacylate and 2 times of α,ω-C3-10alkanediol diacylate to the sum of the α,ω-C3-10alkanediol, α,ω-C3-10alkanediol monoacylate and α,ω-C3-10alkanediol diacylate is selected in the range from 0.5 to 1.1 mol per mol of α,ω-C3-10alkanediol.