Patent ID: 8579495

Claim:
A process for mixing a liquid or mixture of a liquid and a fine solid stored in a storage tank, said storage tank comprising a gas suction apparatus and a motive jet of essentially the same liquid or essentially the same mixture supplied in the storage tank, wherein said gas suction apparatus is disposed entirely in the liquid or mixture of a liquid and a fine solid, with the proviso that the liquid or mixture of a liquid and a fine solid fills only part of the internal volume of the storage tank occupiable by a fluid phase, and the remaining occupiable internal volume of the storage tank is filled by a gas phase, wherein the gas suction apparatus, with the aid of the motive jet, sucks in gas from the gas phase stored in the storage tank and releases the sucked-in gas together with the motive jet into the liquid or mixture of a liquid and a fine solid in the storage tank, wherein the gas phase comprises molecular oxygen, and said gas phase is recycled from said suction apparatus through said liquid or mixture of a liquid and a fine solid and returned to said gas phase; the liquid comprises at least one organic compound from the group consisting of N-vinylformamide, acrolein, methacrolein, acrylic acid, methacrylic acid, esters of acrylic acid and ester of methacrylic acid; the liquid comprises at least one dissolved polymerization inhibitor, at least 10 −5 standard liter of gas per minute per liter of liquid or mixture of liquid and fine solid stored in the storage tank is sucked out of the gas phase and released into the liquid or mixture stored in the storage tank; and ≦1% by volume of the gas which is sucked out of the gas phase and is released into the liquid or mixture stored in the storage tank together with the motive jet is chemically changed as it is bubbled upwards once through the stored liquid or mixture.