METHOD FOR THE OXIDATIVE DEHYDROGENATION OF n-BUTENES TO BUTADIENE

A method for producing butadine from n-butenens, consisting of the following steps: A) a feed gas flow a containing n-butenes is provided; B) the feed gas flow a containing n-butenes and an oxygen-containing gas is fed to at least one dehydrogenation area and is oxidatively dehydrogenated from n-butenes to form butadiene, wherein a product gas flow containing butadiene, unreacted n-butenes, water vapour, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases is obtained; C) the product gas flow b is cooled and compressed in at least compression step, wherein at least one condensate flow c1 containing water and one gas flow c2 containing butadiene, n-butenes, water vapour, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases are obtained; D) non-condensable and low-boiling gas component parts containing oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases as a gas flow d2 are separated from the gas flow c2 by Da) absorbing C-hydrocarbons containing butadiene and n-butenes in absorption means boiling at a high temperature, wherein an absorption agent flow charged with C-hydrocarbons and the gas flow d2 are obtained, Db) the oxygen is removed from the absorption agent flow charged with the C-hydrocarbons by stripping with the inert gas, and Dc) the C-hydrocarbons are desorbed from the charged absorption agent flow, wherein a C-product gas flow d1, which has less that 100 ppm oxygen, is obtained; E) the C-product gas flow d1 is separated by extractive distillation using a selected solvent for butadiene in a material flow e1 containing butadiene and the selective solvent and a material flow e2 containing n-butenes; F) the butadiene and the material flow e1 containing the selective solvent is distilled in a material flow f1 consisting essentially of the selective solvent and a material flow f2 containing butadiene. Способ получения бутадиена из н-бутенов, включающий следующие этапы: A) получение потока а исходного газа, содержащего н-бутены; B) подача потока а исходного газа, содержащего н-бутен, и кислородсодержащего газа по меньшей мере в одну зону дегидрирования и окислительное дегидрирование н-бутенов в бутадиены, причем получают поток образующегося газа, содержащий бутадиен, непрореагировавший н-бутен, водяной пар, кислород, легкокипящие углеводороды, при необходимости, оксиды углерода и, при необходимости, инертные газы; C) охлаждение и сжатие потока b образующ