Method for producing dimethyl ether by fluidized catalytic gas-phase dehydration of methanol

A technology of dimethyl ether and methanol, which is applied in the direction of dehydration of hydroxyl-containing compounds to prepare ether, chemical instruments and methods, physical/chemical process catalysts, etc., which can solve problems such as difficult control of bed temperature

Active Publication Date: 2008-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the dehydration reaction of methanol is exothermic, and the bed temperature is difficult to control

Method used

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  • Method for producing dimethyl ether by fluidized catalytic gas-phase dehydration of methanol
  • Method for producing dimethyl ether by fluidized catalytic gas-phase dehydration of methanol
  • Method for producing dimethyl ether by fluidized catalytic gas-phase dehydration of methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The code name of the catalyst used in this example is MTD-1 (containing 30% by weight of USY zeolite, 5% by weight of ZSM-5 zeolite, and the balance is carrier, all based on the total weight of the catalyst).

[0055] The gaseous methanol raw material enters the reactor and contacts with the MTD-1 catalyst. At a temperature of 270°C and a pressure (gauge pressure) of 0.3MPa, the weight ratio of the catalyst to the methanol raw material (agent-alcohol ratio) is 1.5, and the weight hourly space velocity is 3.0h -1 Reaction under the condition of reacting, reactant flows through separation and obtains carbon deposition catalyst and product flow, and this product flow further separates and obtains target product dimethyl ether, and product distribution is as shown in table 2, and unreacted methyl alcohol returns fluidized bed reactor; The catalyst is divided into two parts, wherein 50% by weight of the carbon-deposited catalyst is stripped, 80% by weight of the carbon-deposi...

Embodiment 2

[0057] The code name of the catalyst used in this example is MTD-2 (containing 35% by weight of USY zeolite, and the balance is a carrier, all based on the total weight of the catalyst)

[0058] The gaseous methanol raw material enters the reactor and contacts with the MTD-2 catalyst. At a temperature of 250°C and a pressure (gauge pressure) of 0.2 MPa, the weight ratio of the catalyst to the methanol raw material (agent-alcohol ratio) is 10, and the weight hourly space velocity is 20h -1 Reaction under the condition of condition, reactant flow obtains coke catalyst and product flow through separation, and this product flow further separates and obtains target product dimethyl ether, and product distribution is as shown in table 2, and excessive methyl alcohol returns fluidized bed reactor; Coke catalyst All go to the regenerator for scorched regeneration. After all the carbon-deposited catalysts are regenerated, the regenerated catalysts are cooled to 280°C and returned to th...

Embodiment 3

[0060] The code name of the catalyst used in this example is MTD-3 (containing 30% by weight of USY zeolite, 5% by weight of Beta zeolite, and the balance being carrier, all based on the total weight of the catalyst).

[0061] The gaseous methanol raw material enters the reactor and contacts with the MTD-3 catalyst, at a temperature of 210°C, a pressure (gauge pressure) of 0.4MPa, a weight ratio of catalyst to methanol raw material (agent-alcohol ratio) of 3, and a weight hourly space velocity of 0.5h -1Reaction under the condition of condition, reactant flow is separated to obtain coke catalyst and product flow, and this product flow is further separated to obtain target product dimethyl ether, and product distribution is as shown in table 2, and excessive methyl alcohol returns fluidized bed reactor; Coke catalyst Divided into two parts, wherein 25% by weight of the coke-deposited catalyst goes to the regenerator for coke regeneration, and the remaining 75% by weight of the c...

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Abstract

The invention relates to a method for producing a dimethyl ether by applying the fluidization, catalysis and gas phase dehydration to a methanol. The methanol serving as the raw materials contacts with the catalysts in which the Y series is contained in a reactor provided with a riser and a fluidized bed and the reaction between the methanol and the catalysts is carried out on the conditions that the temperature ranges from 150 to 350 DEG C, the weight ratio of the catalysts to the methanol raw materials ranges from 0.001 to 50, the reaction time ranges from 0.1 to 20 seconds and the pressure ranges from 1 to 1000kPa; the bed temperature of the fluidized bed reactor is controlled to be below 350 DEG C and the reactants are separated so as to obtain the coked catalysts and the target products, dimethyl ether; the coked catalysts separated out from a cyclone separator are circulated back to the fluidized bed and part or all of the coked catalysts in the fluidized bed are enter a generator to be subject to the coke burning regeneration with or without being stripped; the regenerated catalysts go back into the reactor so as to contact with the methanol raw materials. The method effectively controls the bed reaction temperature and ensures that the methanol is continuously converted into the dimethyl ether, the conversion rate of the methanol is usually higher than 80 per cent and the selectivity of the dimethyl ether is more than 98 per cent.

Description

technical field [0001] The present invention relates to a method for producing dimethyl ether from methanol. Background technique [0002] There are one-step and two-step methods for the production of dimethyl ether (DME). The one-step method refers to the one-time synthesis of dimethyl ether from the raw material gas; the two-step method is to synthesize methanol from the synthesis gas, and then dehydrate to obtain dimethyl ether. [0003] The two-step method is carried out in two steps, that is, methanol is first synthesized from synthesis gas, and methanol is dehydrated under acid catalysis to produce dimethyl ether. The two-step synthesis of dimethyl ether is the main process for the production of dimethyl ether at home and abroad. This method uses refined methanol as a raw material, with few by-products of dehydration reaction, high purity of dimethyl ether, mature technology, wide equipment adaptability, and simple post-treatment. , can be directly built in the metha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/09C07C43/02B01J29/08B01J29/80B01J29/85
CPCY02P20/50Y02P20/584
Inventor 毛安国朱根权谢朝钢孙新孙益群龙军张久顺宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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