The invention
A) comprising the steps of: providing an incoming gas stream containing a n- butene;
B) flowing a gas stream, and also at least one oxygen gas was supplied to the digestion zone and oxidative dehydration, oxidative digestion of dehydrated n- butene to butadiene, under-containing or free of carbon oxides and inert gas containing n- butene the under-containing or free, to obtain a butadiene, non-converted n- butene, and the product gas stream b containing water vapor, oxygen, low-boiling hydrocarbons and high-boiling secondary component;
Ca) product phase is cooled by contacting the gas stream b and coolants and, condensing at least a portion of the high-boiling secondary component;
Cb) to compress the remaining product gas stream b from the at least one compression stage, under-containing or non-aqueous condensate streams c1, and carbon oxides and at least one kind of under-containing or free of an inert gas and butadiene, n- to obtain a butene, the gas stream c2 one kind of containing water vapor, oxygen and low-boiling hydrocarbons;
Da) under-containing or free of carbon oxides, and under-containing or non-containing inert gas, the non-condensing gas and low boiling point components containing oxygen and low-boiling hydrocarbons, a C ₄ hydrocarbons including butadiene and n- butene in absorbent was removed as a gas stream from the gas stream d2 c2 by absorption, to obtain a C ₄ hydrocarbon is a loaded absorbent stream and a gas stream d2, and
Db) to remove the C ₄ hydrocarbons from the absorbent stream subsequently loaded, C ₄ product gas stream to obtain a d1
It includes,
Methane- the included gas stream, at at least one point in a process comprising the step B), Ca), Cb) and Da) sections, for supplying an amount that the formation of explosive gas mixture in step Da) to prevent further comprising the step,
It relates to a process for producing butadiene from butene n-.