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Method for serially producing dimethyl ether by dehydrating solid acid catalyzing methanol

A technology of solid acid catalysis and solid acid catalyst is applied in the dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, organic chemistry, etc. The effect of reaction occurrence, prolongation of catalyst life, and uniform temperature control

Active Publication Date: 2011-05-11
YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dimethyl ether was first produced by methanol liquid-phase dehydration method. The main disadvantages are severe equipment corrosion, harsh operating conditions, and serious environmental pollution.
In industrial production, there are problems such as difficult control of catalyst bed temperature or uneven temperature distribution, so it is difficult for large-scale chemical industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Dehydration of fixed-bed methanol to produce dimethyl ether

[0031] Catalyst, reactor, raw material are the same as comparative example 1. Pack 2500 ml of catalyst in four stages, and fill the upper part of each catalyst bed with 100 ml of Φ6 stainless steel Raschig ring packing, and there are four cooling shock material injection points on the upper part of each layer of Raschig ring packing. Temperature is 125 ℃ of liquid methanol (purity is 97.5% (weight)) at space velocity 0.102 hours -1 Inject into the reactor and adjust the cooling shock flow appropriately according to the bed temperature.

[0032] At a reactor inlet temperature of 210°C, a reaction pressure (gauge pressure) of 1.1 MPa, and a methanol feed space velocity of 3 hours -1 Under the above conditions, the conversion rate of methanol is 75.1%, the selectivity of dimethyl ether is ~100%, and the outlet temperature of the bed is 225.1°C.

Embodiment 2

[0033] Embodiment 2: Dehydration of fixed-bed methanol to produce dimethyl ether

[0034] The catalyst is a gamma-alumina catalyst, and the reactor, methanol raw material, quenching material, inert packing, and catalyst loading are the same as in Example 1.

[0035] At a reactor inlet temperature of 225°C, a reaction pressure (gauge pressure) of 1.1MPa, and a methanol feed space velocity of 3 hours -1 Under certain conditions, the conversion rate of methanol is 86.2%, the selectivity of dimethyl ether is 99.99%, and the outlet temperature of the bed is 237°C.

Embodiment 3

[0036] Example 3: Dehydration of methanol in a fixed adiabatic bed to produce dimethyl ether

[0037]Catalyst is D803C-III01 (commercial catalyst, DICP), and catalyst is ZSM-5 and gamma-alumina mixed by 50:50; Reactor, methanol raw material, chilling material, inert filler, catalyst loading are the same as embodiment 1 .

[0038] At a reactor inlet temperature of 190°C, a reaction pressure (gauge pressure) of 1.2MPa, and a methanol feed space velocity of 2.5 hours -1 Under the above conditions, the conversion rate of methanol is 77.6%, the selectivity of dimethyl ether is ~100%, and the outlet temperature of the bed is 230.6°C.

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PUM

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Abstract

The invention discloses a method for serially producing dimethyl ether by dehydrating solid acid catalyzing methanol, comprising the steps of: filling solid acid catalysts in a reactor section by section; arranging an inert filler layer at the upper part of each catalyst bed; and contacting cold shock materials with the solid acid catalysts after the cold shock materials pass through the inert filler layers, wherein the reaction pressure is 0.2-4.0MPa, the reaction temperature is 120-400DEG C and the feeding airspeed is 0.1-20.0h<-1>. In the invention, the solid acid catalysts are filled section by section and the temperature of a gas-phase reaction catalyst bed is controlled in a set range by using the cold shock materials; and under the condition of obtaining higher methanol percent conversion, as the temperature of the catalyst beds is controlled evenly, the side reaction is reduced and the life of the catalysts is prolonged.

Description

technical field [0001] The invention relates to a method for producing dimethyl ether from methanol, in particular to a reaction process for continuously producing dimethyl ether by adopting methanol vapor phase dehydration. Background technique [0002] Dimethyl ether is a widely used chemical product and fuel substitute. Dimethyl ether was first produced by methanol liquid-phase dehydration method. The main disadvantages are severe equipment corrosion, harsh operating conditions, and serious environmental pollution. At present, the industry mainly uses solid acid to catalyze the gas phase dehydration of methanol to produce dimethyl ether. [0003] USP6740783 discloses a molecular sieve catalyst for producing dimethyl ether from methanol. Protons on the molecular sieve catalyst are replaced by metals or amines, and methanol gas undergoes dehydration reaction on the molecular sieve catalyst. [0004] Chinese patent CN 1036199A discloses a method for producing dimethyl ethe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09
Inventor 朱书魁刘中民许磊孙新德魏迎旭杨越张莹
Owner YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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