High-purity MTBE process method for efficiently removing isobutene and preparation system thereof

Abstract

The invention provides a high-purity MTBE process method for efficiently removing isobutene and a preparation system thereof. The process method is characterized in that a rectification separation part for separating an MTBE product from a product flow of an etherification pre-reaction part is connected in series between the etherification pre-reaction part and a catalytic rectification part. The preparation system comprises an etherification pre-reactor, a catalytic rectifying tower and a rectifying separator which is connected in series between the etherification pre-reactor and the catalytic rectifying tower and is used for obtaining the MTBE product. According to the technical scheme, the high-purity MTBE product is obtained while isobutene is efficiently removed, and the method has the practical technical advantages that the technological process is shortened, the system composition is simplified, and industrial economy is achieved.

Description

technical field [0001] This patent application relates to the field of petrochemical industry, in particular to a process for removing isobutene in mixed C4 with a process for preparing MTBE and a process device system thereof. Background technique [0002] Following the promotion and implementation of the "Implementation Plan on Expanding the Production of Biofuel Ethanol and Promoting the Use of Ethanol Gasoline for Vehicles", it means that MTBE will not be used as a gasoline additive and will face a ban. However, in addition to the application as a gasoline additive component, MTBE is still an important chemical raw material, but when used as a chemical raw material, its purity is required to be high, and the purity of the gasoline additive component cannot meet the application of chemical raw materials required. The reason is that by-product impurities such as MSBE will be produced in the preparation of MTBE by etherification. Since the boiling point of the MSBE impurit...

AI Technical Summary

Problems solved by technology

[0004] However, there are technical problems that cannot be ignored in the current preparation process of MTBE: the pursuit of high-purity MTBE quality is the goal, and its isobutene conversion rate is low, which cannot meet the index requirements for isobutene content when industrial C4 is used as butene raw material supply; and With the technical goal of deep removal of isobutene in industrial C4, the purity of the prepared MTBE is difficult to reach the purity index as a chemical raw material

The existing technical means of MTBE preparation process cannot take into account the technical requirements of both aspects. Even if the technical requirements of the two aspects are taken into account, the technical status of the process is too complicated, the system process is long, the equipment composition is large, and the energy consumption is high.

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