Refining device for preparing high-pure isobutene by cracking methyl tertiary butyl ether and technique thereof

A technology of methyl tertiary butyl ether and refining device, applied in the field of rectification, can solve the problems of incomplete absorption of methanol, inability to produce high purity, affecting purity, etc., to reduce energy consumption and production cost, and reduce the pressure drop of the whole tower , the effect of high purity

Inactive Publication Date: 2008-09-10
TIANJIN UNIV
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Problems solved by technology

[0003] The purification and separation process adopted by the manufacturers of methyl tert-butyl ether (MTBE) cracking to produce isobutene in China has the problem of incomplete absorption of methanol, which is brought into the isobutene product and affects its purity.
The isobutene production process described in Lanzhou Hongye Fine Chemical Co., Ltd.’s patent application number 200610041851.6 uses two towers (cooling absorption tower, methanol dehydration tower) separation process in the separation process, and the purity of the separated isobutene product reaches 99.41%, which cannot be produced High-purity (purity higher than 99.7%) isobutene products

Method used

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  • Refining device for preparing high-pure isobutene by cracking methyl tertiary butyl ether and technique thereof

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto.

[0019]After cracking of methyl tert-butyl ether (MTBE), it contains 58.75% (wt) of isobutylene, 34.52% (wt) of methanol, 4.92% (wt) of MTBE, 0.51% (wt) of dimethyl ether, and 0.15% (wt) of tert-butanol , water 0.25% (wt) and C80.9% (wt) cracked gas 0 enters the described cooling absorption double tower system from the tower still of cooling absorption tower 1 and starts cooling absorption operation, and cooling absorption tower 2 tower stills distillate water 8( Fresh water 7) enters the cooling absorption tower 1 from the top of the tower when just driving. Cooling absorption tower 1 is operated under normal pressure or slightly positive pressure, with 16 theoretical plates, and the internals of the tower adopt high-efficiency structured packing and multi-row hole distribution internals. Afte...

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Abstract

The invention discloses a refining device and a technical method used to make high-purity isobutene through the cracking of methyl tert-butyl ether. The technical method contains a six-tower continuous rectification technical process, and comprises a cooling absorption double tower system, a methanol dehydrating tower system, a methanol refining tower system, an isobutene light fraction-removal tower system and an isobutene heavy fraction-removal tower system, wherein the water discharged from the methanol dehydrating tower system is cooled down and then is returned to a cooling absorption tower to undergo cooling absorption operation once again; therefore, the refining process realizes zero release of cooling absorption water; moreover, the internal top of a cooling absorption tower 2 is provided with a foam destroyer which catches the liquid droplets carried in gas, thereby ensuring the purity of isobutene product. All internal parts of each rectification tower device adopt efficient regular filler and multi-row hole distribution, which ensures that the purity of high-purity isobutene product is more than 99.7 percent.

Description

technical field [0001] The invention relates to the technical field of rectification, in particular to a refining device and a process method for producing high-purity isobutene by cracking methyl tert-butyl ether. The six-tower continuous rectification process is used to use methyl tert-butyl ether (MTBE) pyrolysis gas as the raw material, and the internal parts of the rectification tower use high-efficiency structured packing and multi-row hole distribution internals to refine high-purity isobutene products, and at the same time realize the separation process. The zero discharge of circulating water achieves the purpose of reducing energy consumption and saving investment. Background technique [0002] Isobutylene is an important organic chemical raw material, widely used in butyl rubber, polyisobutylene, tert-butyl mercaptan, tert-butylamine, tert-butyl acetate, methyl methacrylate, tert-butanol, methacrylic acid, methyl Petrochemical production fields such as acrylonitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/09
Inventor 刘丽艳黄国强李鑫钢
Owner TIANJIN UNIV
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