MTBE device methanol recovery system and process

Abstract

The invention discloses a MTBE device methanol recovery system and a process. The MTBE device methanol recovery system comprises a methyl alcohol raw material tank and a C4 raw material tank which are connected with a feeding mixer, the feeding mixer is connected with a catalytic distillation tower through a purifier, the top of the catalytic distillation tower is connected with a catalytic distillation reflux tank, and the bottom of the catalytic distillation tower is connected with an MTBE product tank; the catalytic distillation reflux tank is in reflux connection with the catalytic distillation tower through a pipeline and is connected with a C4 tower through a pipeline, one path of the C4 tower is connected with a C4 tower reflux tank, one path of the C4 tower is connected with a heavy C4 product tank, and one path of the C4 tower is connected with an isobutane product tank; one path of the C4 tower reflux tank is in reflux connection with the C4 tower, one path of the C4 tower reflux tank is connected with an isobutane product tank, the other path of the C4 tower reflux tank is a methanol recycling pipeline, and the C4 tower reflux tank is connected with a methanol raw material tank through a methanol recycling pipeline. The invention relates to an innovative process for recovering methanol by an MTBE device, which does not adopt a common extraction and conventional distillation method in a methanol recovery process, and adopts an azeotropic distillation method for methanol recovery. No water participates in the recovery process, so that the problem of acid corrosion of equipment can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of methanol recovery, in particular to a methanol recovery system and process of an MTBE device. Background technique [0002] The raw materials of MTBE (methyl tert-butyl ether) plant are mixed C4 liquefied gas raw materials containing isobutene components and high-grade methanol, using large-pore diameter, strongly acidic cation exchange resins as catalysts. Under certain temperature and pressure conditions, the isobutene in the raw material C4 reacts with methanol under the action of the catalyst in the reactor to synthesize MTBE, and then the MTBE product is separated through the catalytic distillation tower. Unreacted carbon four components (unreacted carbon four) and methanol are separated from the methanol recovery system. The device is mainly composed of four parts: etherification reaction, catalytic distillation, methanol recovery and MTBE refining. [0003] The methanol in the overhead distillate...

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Problems solved by technology

[0004] Affected by factors such as catalyst entrainment of free acid, catalyst deactivation and desulfurization, etc., the methanol recovery system presents acid corrosion phenomenon

Corrosion leakage of similar production equipment, packing or sieve plate clogging occur from time to time, which has certain adverse effects on the safe production of the equipment

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