Device and method for preparing high-purity isobutene through tert-butyl alcohol dehydration by means of catalytic distillation structured packing

Abstract

The invention discloses a device and method for preparing high-purity isobutene through tert-butyl alcohol dehydration by means of catalytic distillation structured packing. The device comprises a catalytic reaction distillation column, wherein a catalytic distillation section and a stripping section are arranged in the catalytic reaction distillation column from top to bottom, a plurality of layers of packing provided with catalysts is arranged in the catalytic distillation section, and a plurality of layers of packing not provided with catalysts is arranged in the stripping section. Each packing layer comprises a first component and a second component, wherein the first component is a window opening diversion packing sheet, and the second component is a structured packing sheet. Due to the fact that the window opening diversion type structured packing is adopted for the catalytic reaction distillation column, gas-liquid mass-transfer area is effectively increased, and gas-liquid mass-transfer rate is increased. The method is simple, effect is good, environment friendliness is realized, tert-butyl alcohol conversion rate, isobutene purity and the purity of water extracted from a column reactor can all reach 99.9 wt%, and water extracted from the column reactor of the catalytic reaction distillation column can be recycled.

Description

technical field [0001] The invention belongs to the technical field of isobutene preparation, in particular to a device and method for dehydrating tert-butanol to prepare high-purity isobutene by using catalytic rectification structured packing. Background technique [0002] Isobutylene is a widely used chemical raw material, which can be used to synthesize widely used chemical products such as methyl tert-butyl ether, butyl rubber, polyisobutylene and methyl methacrylate. [0003] C 4 The distillate is rich in a large amount of isobutene and n-butene, and is one of the main sources of isobutene. industry directly from C 4 The method for obtaining isobutene in China is mainly the sulfuric acid absorption method, which mainly uses the difference in the absorption rate of isobutene and n-butene by sulfuric acid to selectively absorb isobutene from the fraction. However, this process is more corrosive to equipment and more serious to environmental pollution, so it has been e...

AI Technical Summary

Problems solved by technology

In this invention, the conversion rate of tert-butanol has been improved to a certain extent, and the purity of isobutene is relatively high, but the tower inner packing uses θ ring packing, the catalyst is divided into sections and catalysts are loaded into each catalyst section, and the mass transfer effect still needs to be improved. , and the immobilization of the catalyst is difficult to guarantee

[0007] Chinese patent CN102485305B discloses a catalyst loading structure and process for producing isobutene by catalytic rectification and dehydration of tert-butanol. The catalyst layer is composed of multiple reactors, steam baffles and liquid released vertically and uniformly in the cylinder of the reaction section. The catalyst is packed in the reactor in bulk, the steam baffle is placed on the bracket welded on the inner wall of the tower, and the reactor is fixed on the steam baffle, although this invention can increase the residence time of the liquid on the catalyst and reduce the catalyst loading Quantity, but its structure is complex, difficult to disassemble, difficult to be used for industrialization

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