Method for producing nanoparticles from a liquid mixture

A process for the production of nanoparticles from a liquid mixture comprising at least one precursor and at least one solvent in a reactor with continuous through-flow, comprising:

• a) feeding at least one oxygen-containing gas inflow stream having a temperature TI in a range between 900 and 1400 K and a flow velocity vIM of 5 to 200 m/s into a first section A of the at least one reactor,
• b) adding at least one fuel having a temperature TF in a range between 300 and 500 K to the oxygen-containing gas inflow stream, wherein the addition of the at least one fuel takes place in a second section B of the reactor provided downstream of the first section A, wherein the fuel and the oxygen-containing gas inflow stream form a homogeneous ignitable mixture having a temperature TIM, wherein the temperature of the homogeneous ignitable mixture TIM is below the temperature TI of the oxygen-containing gas inflow stream and is above the autoignition temperature TAIM of the homogeneous ignitable mixture, wherein the air ratio λ of the ignitable mixture is in a range between 1 and 10,
• c) spraying at least one precursor-solvent mixture into the homogeneous ignitable mixture in a third section C of the reactor,
• d) autoignition of the ignitable mixture of oxygen-containing gas and fuel after an ignition delay time tID of 1 ms to 200 ms in a fourth section D of the reactor provided downstream of the second section B and the third section C to form a stabilized flame with a turbulent flame velocity vF, wherein the flow velocity vIM is greater than the turbulent flame velocity vF such that a blowback of the flame to the fuel addition site is prevented, and reacting the precursor-solvent mixture in the stabilized flame to form nanoparticles from the metal salt precursor, and
• e) removing the nanoparticles formed from the reactor.