Method for producing dimethyl ether from methanol

A technology of dimethyl ether and methanol, which is applied in the field of gas-phase dehydration to produce dimethyl ether, and can solve problems such as difficult control of bed temperature

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

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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 from methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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).

[0036] The gaseous methanol raw material enters the fluidized bed reactor and contacts with the MTD-1 catalyst. At a temperature of 280°C and a pressure (gauge pressure) of 0.1 MPa, the weight ratio of the catalyst to the methanol raw material (agent-alcohol ratio) is 2.5, 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 sent to the regenerator for c...

Embodiment 2

[0039] 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)

[0040] The liquid methanol raw material enters the fluidized bed reactor and contacts with the MTD-2 catalyst. At a temperature of 380°C and a pressure (gauge pressure) of 0.1MPa, the weight ratio of the catalyst to the methanol raw material (agent-alcohol ratio) is 40, and the weight hourly space velocity is 50h -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.

[0041] After all the carbon-deposited catalysts are regenerated, the regenerated catalysts are cooled to 410...

Embodiment 3

[0043] 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).

[0044] The liquid methanol raw material enters the fluidized bed reactor and contacts with the MTD-3 catalyst. At a temperature of 150°C and a pressure (gauge pressure) of 0.1MPa, the weight ratio of the catalyst to the methanol raw material (agent-alcohol ratio) is 6, and the weight hourly space velocity is 0.1h -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 It is divided into two parts, wherein 25% by weight of the carbon-deposited catalyst is sent to the regenerator for coke regeneratio...

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Abstract

The present invention provides a production method of dimethyl ether from methanol. The methanol material and catalyst containing Y-series zeolite contact and react in a reactor where the catalyst can be fluidized; the reaction materials are separated to get carbon deposit catalyst and target product dimethyl ether; part of or all of the carbon deposit catalyst enter a regenerator to be burnt and regenerated. The regenerated catalyst returns into the reactor to contact the methanol material. The method can effectively control the reaction temperature of bed layers, ensures the continuous transformation of methanol into dimethyl ether; the conversion rate of methanol is generally more than 80 per cent; the selectivity of dimethyl ether is more than 98 percent.

Description

technical field [0001] The invention relates to a method for producing dimethyl ether from methanol, more specifically, the invention belongs to a method for producing dimethyl ether by gas-phase dehydration of methanol in a reactor in which the catalyst can be fluidized / moved / flowed. 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-...

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 龙军汪燮卿朱根权毛安国谢朝钢孙益群张久顺舒兴田宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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