Process method for preparing methyl tert-butyl ether by differential reaction rectification and equipment for same

Abstract

The invention relates to a process method for preparing methyl tert-butyl ether by differential reaction rectification and equipment for the same, wherein isobutene and methanol are used raw materials for preparing methyl tert-butyl ether. The process method comprises the following steps of: feeding isobutene and methanol in a fixed-bed reactor (1) in a certain mixing ratio to perform pre-reaction; feeding the raw materials after the pre-reaction in a catalytic reaction rectification tower (2); primarily separating the methyl tert-butyl ether generated in the pre-reaction from the unreacted raw materials under the action of a tower internal part (6) at a lower rectification section; further concentrating the generated methyl tert-butyl ether under the action of a tower internal part (5) at a stripping section; and finally obtaining a methyl tert-butyl ether qualified product at the bottom of the tower, and feeding the unreacted raw materials primarily separated by the tower internal part (6) at a lower rectification section in a differential catalytic reaction rectification tower plate (7) to continue to react.

Description

technical field [0001] The invention relates to a process and equipment for preparing methyl tert-butyl ether, in particular to a process and equipment for preparing methyl tert-butyl ether through differential reaction distillation. Background technique [0002] Methyl tert-butyl ether (MTBE) is a gasoline additive with a high octane number (research octane number 115). It is good for starting, and it is often used in the blending of unleaded gasoline and low lead oil. MTBE can also be re-cracked into isobutylene as a raw material for rubber and other chemical products. The best quality methyl tert-butyl ether can be used as medicine and is a medicine intermediate. [0003] In the prior art, methyl tert-butyl ether is synthesized using methanol and isobutylene as raw materials with the aid of acidic catalysts, among which resin catalysts are the most widely used catalysts in industry. Catalysts for the synthesis of methyl tert-butyl ether include hydrofluoric acid, sulfu...

AI Technical Summary

Problems solved by technology

The disadvantages of the fixed bed reactor are: ①The heat transfer is poor, and when the heat of reaction is very large, even the tubular reactor may have a runaway temperature (the reaction temperature is out of control and rises sharply, exceeding the allowable range)

However, due to the relatively large loading of the catalyst, the height of the gas riser is relatively high, and the bed resistance is relatively large. The gas velocity in the gas riser and the mass transfer element above the gas riser depend on the height of the gas riser and the density and viscosity of the liquid. Therefore, the pressure drop of the tower is still very high, and it is easy to cause problems such as liquid flooding on the tray or the liquid on the tray cannot enter the catalyst in time, and the catalytic reaction efficiency is low.

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