Method for producing isobutene and methanol

A technology of isobutylene and methanol, applied in the directions of organic chemistry methods, chemical instruments and methods, hydrolysis preparation, etc., can solve the problems such as reduced catalytic activity of methyl-tert-butyl ether decomposition, economic efficiency defects, etc.

Inactive Publication Date: 2003-01-29
SUMITOMO CHEM CO LTD
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Problems solved by technology

However, according to this method, heavy components that are a by-product in the first step, such as isobutylene dimers and trimers, etc., are concentrated, and as a result, the activity of the methyl-tert-butyl ether decomposition catalyst is significantly reduced.
[0003] On the other hand, when taking out a part of the heavy components to avoid these heavy components from being too concentrated, the raw material methyl-tert-butyl ether will be together with these heavy components, causing economical disadvantages

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  • Method for producing isobutene and methanol
  • Method for producing isobutene and methanol

Examples

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Embodiment 1

[0043] Embodiment 1 and comparative example 1 such as figure 1 As shown in the flow chart of , Example 1 uses the following first step to fourth step. The abbreviations in the table are as follows: MTBE: methyl-tert-butyl ether; DIB: isobutylene dimer; DME: dialkyl ether; and TBA: tert-butanol.

[0044] The first step: in the presence of a solid acid catalyst containing alumina, the decomposition reaction of methyl-tert-butyl ether is carried out to obtain isobutylene, methanol and dialkyl ether and by-product heavy components, wherein the heavy components include isobutylene di polymers and isobutylene terpolymers. A fixed bed gas phase reaction is used. The reaction temperature is 220°C, and the reaction pressure is 6kg / cm 2 g. The feed rate of methyl-tert-butyl ether is LHSV 3(h -1 ) The reaction gas becomes liquid after being cooled by heat recovery equipment.

[0045] The second step: washing the reaction liquid obtained in the first step with water, and separating ...

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Abstract

A process for producing isobutylene and methanol comprising: a first step of subjecting methyl-tert-butyl ether to decomposition in the presence of a catalyst to obtain a reaction liquid; a second step of washing the resultant with water to separate the reaction liquid into an oil layer and an aqueous layer; a third step of subjecting the oil layer to distillation to obtain a fraction containing isobutylene and a dialkyl ether from the top of a distillation column, a fraction containing methyl-tert-butyl ether and the heavy components from the bottom of the column and a fraction containing methyl-tert-butyl ether from a side cut of the column, and recycling the side cut fraction to the first step; and a fourth step of subjecting the aqueous layer to distillation to obtain a fraction containing methanol from the top of a distillation column and a fraction containing water from the bottom of the column.

Description

technical field [0001] The present invention relates to a method for producing isobutene and methanol. More specifically, the present invention relates to a method for producing isobutene and methanol, wherein methyl-tert-butyl ether is decomposed into isobutene and methanol, isobutene and methanol are separated, and then individually recovered, thereby suppressing the production of The loss of methyl-tert-butyl ether as a raw material has the effect of obtaining isobutene and methanol very economically. Background technique [0002] A method for recovering isobutene and methanol is known by decomposing methyl-tert-butyl ether into isobutene and methanol and separately separating isobutene and methanol (for example, JP 47-04188B). However, according to this method, heavy components such as isobutylene dimer and trimer etc. which are a by-product in the first step are concentrated, and as a result, the activity of the methyl-tert-butyl ether decomposition catalyst is signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/10C07B61/00C07C1/20C07C7/04C07C7/10C07C11/09C07C29/00C07C29/09C07C29/74C07C29/80C07C29/86C07C31/04
CPCC07C29/00C07C29/74C07C1/20C07C11/09C07C31/04C07C29/09
Inventor 山濑正信铃木芳明
Owner SUMITOMO CHEM CO LTD
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