A process for preparing isobutene from MTBE-containing mixtures, including: a) in a reactor, cleaving a mixture obtained from an MTBE-containing feedstock and/or an MTBE-containing stream, affording a stream of reaction products including isobutene, methanol, MTBE, and by-products, which are a1) high boilers having a boiling range above 55° C. at a pressure of 0.1 MPa, a2) medium boilers having a boiling range of 12 to 55° C. at a pressure of 0.1 MPa, and a3) low boilers having a boiling range below 12° C. at a pressure of 0.1 MPa; b) distillatively separating stream into a stream which contains the isobutene product and low boilers, and a stream which contains MTBE, methanol, medium boilers and high boilers; c) distillatively separating stream to obtain an MTBE-containing stream and a methanol-containing high boiler stream; and d) recycling an MTBE-containing stream into a) of the process, the medium boilers being removed completely or partially before d) from the streams rich in medium boilers.
从含
MTBE的混合物中制备
异丁烯的工艺,包括:a)在反应器中,将从含
MTBE原料和/或含
MTBE流中获得的混合物裂解,得到包括
异丁烯、
甲醇、
MTBE和副产物的反应产物流,其中副产物包括a1)在0.1 MPa压力下沸点高于55°C的高沸点物、a2)在0.1 MPa压力下沸点为12至55°C的中沸点物,以及a3)在0.1 MPa压力下沸点低于12°C的低沸点物;b)将反应产物流分馏分离成含有
异丁烯产品和低沸点物的流,以及含有
MTBE、
甲醇、中沸点物和高沸点物的流;c)将分馏产物流进一步分离以获取含
MTBE的流和含
甲醇的高沸点物流;d)将含
MTBE的流回收到a)的工艺中,从富含中沸点物的流中在d)之前完全或部分地去除中沸点物。