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Method for producing two-stage dimethyl ether

A production method and technology of dimethyl ether, applied in the field of ether production technology, can solve the problems of low utilization rate of reaction heat distribution and the like

Active Publication Date: 2013-03-20
ENN XINNENG BEIJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction heat recovery and utilization system is simple, and the distribution and utilization rate of reaction heat is low

Method used

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  • Method for producing two-stage dimethyl ether
  • Method for producing two-stage dimethyl ether

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: Two-stage methanol dehydration catalyst and preparation method thereof

[0041] Get 1000g of aluminum chloride solution containing 3% (wt) of aluminum as solution A, use 20g each of lanthanum nitrate and cerium nitrate solutions containing 5% (wt) of La and Ce, and stir to prepare mixed solution B. First add 200ml of deionized water into the reactor, neutralize with 8% (wt) ammonia solution D, control the neutralization temperature at 60-70°C, and the stirring speed at 120r / min. Stop feeding when the pH value reaches 7.5~8.5 (feeding time is about 30 minutes). Then add 200 g of water glass solution C containing 18% of silicon dioxide, the addition time is about 15 minutes, and the pH value is controlled at 8.5 to 9.5. After aging for 2 hours, wash with deionized water until the chloride ion content of the dry basis catalyst is less than 0.5%. After filtration, the filter cake was dried at 120°C for 24 hours and crushed to 250 mesh. Then it was kneaded w...

Embodiment 2

[0044] Embodiment 2: Two-stage methanol dehydration catalyst and preparation method thereof

[0045] Get 1200g of aluminum chloride solution containing 3% (wt) of aluminum as solution A, use 20g each of lanthanum nitrate and cerium nitrate solutions containing La and Ce 5% (wt), and stir to prepare mixed solution B. First add 200ml of deionized water into the reactor, neutralize with 8% (wt) ammonia solution D, control the neutralization temperature at 60-70°C, and the stirring speed at 120r / min. Stop feeding when the pH value reaches 7.5~8.5 (feeding time is about 30 minutes). Then add 170 g of solution C containing water glass 18% of silicon dioxide, the addition time is about 15 minutes, and the pH value is controlled at 8.5 to 9.5. After aging for 2 hours, wash with deionized water until the chloride ion content of the dry basis catalyst is less than 0.5%. After filtration, the filter cake was dried at 120°C for 24 hours and crushed to 250 mesh. Then it was kneaded with...

Embodiment 3

[0046] Embodiment 3: Two-stage methanol dehydration catalyst and preparation method thereof

[0047] Get 1400g of aluminum chloride solution containing 3% (wt) of aluminum as solution A, use 20g of lanthanum nitrate and cerium nitrate solutions containing La and Ce 5% (wt), stir and prepare mixed solution B. First add 200ml of deionized water into the reactor, neutralize with 8% (wt) ammonia solution D, control the neutralization temperature at 60-70°C, and the stirring speed at 120r / min. Stop feeding when the pH value reaches 7.5~8.5 (feeding time is about 30 minutes). Then add 120 g of solution C containing water glass 18% of silicon dioxide, the addition time is about 15 minutes, and the pH value is controlled at 8.5 to 9.5. After aging for 2 hours, wash with deionized water until the chloride ion content of the dry basis catalyst is less than 0.5%. After filtration, the filter cake was dried at 120°C for 24 hours and crushed to 250 mesh. Then it was kneaded with 2% (wt)...

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Abstract

Provided is a method for the two-stage production of dimethyl ether, which is characterized in that two reactors filled respectively with separate catalysts having different performances for dimethyl ether are connected in series, greatly increasing methanol conversion per pass. Another characteristic lies in a method for optimizing the reasonable distribution and utilization of the heat of reaction.

Description

technical field [0001] The invention relates to the field of ether production technology, in particular to a production method of dimethyl ether. Background technique [0002] The existing process flow for producing dimethyl ether by methanol vapor phase method is as follows: After methanol is heated by a vaporizer or a vaporization tower, it enters a reactor equipped with the same catalyst for dehydration reaction. The reaction product enters the rectification system for separation and purification to obtain the dimethyl ether product. [0003] Disclosed a kind of method of producing dimethyl ether as CN1036199A, methyl alcohol enters reactor by heat exchanger heating gasification, in gamma-Al 2 o 3 In the presence of a catalyst, the gas phase methanol is catalytically dehydrated, and the dehydrated product enters the rectification tower for rectification and separation, and then the pure dimethyl ether product is extracted on a certain tray of the tower, and the boiling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09C07C41/42B01J21/12B01J23/10
CPCC07C41/09B01J23/10C07C43/04
Inventor 常俊石史立杰刘雪飞张建祥
Owner ENN XINNENG BEIJING TECH
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