Liquefaction catalytic conversion method for producing dimethyl ether with methanol

A fluidized catalysis and dimethyl ether technology, which is applied in the dehydration of hydroxyl-containing compounds to prepare ether, the formation/introduction of ether groups/acetal groups/ketal groups, and the preparation of ethers, etc. The problems of short service life of the catalyst, a large amount of residual acid and waste water, etc., achieve the effect of being beneficial to methanol conversion, increasing the processing capacity, gas-solid mass transfer and high

Active Publication Date: 2008-04-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the severe carbonization of methanol by concentrated sulfuric acid, the service life of the catalyst is short
At the same time, the dehydration reaction will produce a large amount of residual acid and waste water, which will seriously pollute the environment.
The reaction intermediate methyl hydrogen sulfate is highly toxic and endangers human health

Method used

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  • Liquefaction catalytic conversion method for producing dimethyl ether with methanol
  • Liquefaction catalytic conversion method for producing dimethyl ether with methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Methanol raw material, regenerated catalyst A cooled to 400°C and water vapor enter the circulating fluidized bed reactor, under pressure of 0.11MPa (gauge pressure), temperature of 400°C, liquid hourly space velocity for 4 hours -1 , react under the condition of agent-alcohol ratio 2, remove heat from the circulating fluidized bed reactor during the reaction, and the weight of the low-temperature catalyst taken from the reactor to the heat extraction section of the regenerant accounts for 15% of the total weight of the catalyst in the reactor , separating the reactant flow and the raw catalyst, wherein the reactant flow is separated to obtain the target product dimethyl ether, and the raw catalyst is stripped and regenerated in turn, and then enters the regenerated catalyst to take the hot section to cool and return to the reactor for recycling.

[0050] The operating conditions and product distribution are listed in Table 2. As can be seen from Table 2, the conversion...

Embodiment 2

[0055] Methanol raw material, regenerated catalyst A cooled to 350°C and water vapor enter the circulating fluidized bed reactor, under pressure of 0.11MPa (gauge pressure), temperature of 350°C, liquid hourly space velocity of 2.5 hours -1 1. Reaction under the condition of agent-alcohol ratio of 10. During the reaction, the heat is removed from the circulating fluidized bed reactor, and the low-temperature catalyst is not taken from the reactor to the heat extraction section of the regenerant, that is, there is no catalyst circulation in the reactor, and the separation reaction The stream and the raw catalyst, wherein the reactant stream is separated to obtain the target product dimethyl ether, the raw catalyst is stripped in turn and mixed with the high-temperature regenerated catalyst, and 40% by weight of the mixed catalyst enters the regenerator and burns, and the other part is After entering the regenerated catalyst heat extraction section, it is cooled and returned to t...

Embodiment 3

[0058] Methanol raw material, regenerated catalyst A cooled to 200°C and water vapor enter the circulating fluidized bed reactor, under pressure of 0.11MPa (gauge pressure), temperature of 200°C, liquid hourly space velocity of 0.5 hours -1 1. Reaction under the condition of agent-alcohol ratio of 18. During the reaction process, the heat is removed from the circulating fluidized bed reactor, and the low-temperature catalyst is not taken from the reactor to the heat extraction section of the regenerant, that is, there is no catalyst circulation in the reactor, and the separation reaction The stream and the raw catalyst, wherein the reactant stream is separated to obtain the target product dimethyl ether, and the raw catalyst is stripped and regenerated in turn, and then enters the regenerated catalyst to take the heat section to cool and return to the reactor for recycling.

[0059] The operating conditions and product distribution are listed in Table 3. As can be seen from Ta...

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Abstract

The present invention provides a fluidization and conversion method using methanol to prepare dimethyl ether. The methanol material, cooled regenerated catalyst and pre-lifting medium orderly enter a circulating fluidized bed. At a temperature between 150 and 500 DEG C, under pressure between 0.1MPa and 1.0MPa and at a liquid space-time speed of 0.5 to 4 hours, the -1, catalyst and methanol material react with a weight ratio of 1 to 20. In the reaction process, heat is removed from the circulating fluidized bed; the reaction material flow and catalyst to be generated are separated. Wherein, the target product dimethyl ether can be got by separation of the reaction material flow. The catalyst to be generated is recycled orderly after gas extraction, regeneration and cooling. Compared with a fixed-bed, the circulating fluidized bed of the method provides better gas-solid contact, and has gas-solid phase medium and high heat transfer efficiency. Therefore, the method improves the conversion rate of methanol and the selectivity of dimethyl ether product.

Description

technical field [0001] The invention belongs to a method for preparing dimethyl ether by gas-phase catalytic dehydration of methanol, more specifically, a method for preparing dimethyl ether by using a fluidized catalytic conversion method to carry out gas-phase catalytic dehydration of methanol. Background technique [0002] Dimethyl ether is a colorless gas or compressed liquid with a slight ethereal odor, non-toxic and non-corrosive, and will not form peroxides when exposed to air for a long time. So far, DME production is modest. As an environmentally friendly fuel, it has only been proposed in recent years, and it has immediately attracted widespread attention from the energy sector all over the world. The physical and chemical properties of dimethyl ether are similar to those of liquefied petroleum gas, and it can become liquid at relatively low pressure. The infrastructure of liquefied gas can be used for dimethyl ether, and long-distance transportation can use oil t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09C07B41/04
CPCY02P20/584
Inventor 龙军汪燮卿程从礼许友好龚剑洪朱根权谢朝钢毛安国达志坚张久顺
Owner CHINA PETROLEUM & CHEM CORP
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