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Method for controlling reaction temperature in preparation of dimethyl ether from methanol

A technology of reaction temperature and control method, which is applied in the dehydration of hydroxyl-containing compounds to prepare ethers, ether preparations, organic chemistry, etc. It can solve the problems of large temperature difference in the catalyst bed, short catalyst life, and easy aging of the catalyst, and achieve the start-up and operation process. The effect of simplicity, prolonging catalyst life, and ease of controlling and regulating the reaction zone temperature

Inactive Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problems to be solved by the present invention are: in the existing methanol dimethyl ether reactor, the catalyst bed temperature difference is large, the hot spot temperature is high, the catalyst is easy to age, the catalyst life is short, and the energy consumption of the feed is high.

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  • Method for controlling reaction temperature in preparation of dimethyl ether from methanol
  • Method for controlling reaction temperature in preparation of dimethyl ether from methanol
  • Method for controlling reaction temperature in preparation of dimethyl ether from methanol

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Experimental program
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Embodiment 1

[0032] Based on 1000kg / h pure methanol feed, n is 6, according to Figure 1a Or the scheme shown in 1b is reacted, and the feed rate of the feed port of the first reaction zone is 600kg / h respectively, that is, K1=0.6, then according to the formula 50(1-K1)+245≤T1≤50(1-K1)+ 285 calculation can get 265≤T1≤305, T1 is 265, 285, 305 respectively. Pick Then the results of outlet temperature point temperature, hot spot temperature and methanol conversion rate of each reaction zone are shown in Table 1:

[0033] Table 1

[0034] a section of exit Second exit Three exits Fourth exit Fifth exit Six exits hot spot temperature methanol conversion T1＝265 311 294 304 317 328 336 336 83.8％ T1＝285 330 307 316 328 339 347 347 83.9％ T1＝305 349 321 328 339 350 358 358 84.0％

Embodiment 2

[0036] Based on 1000kg / h pure methanol feed, n is 6, according to Figure 1a Or the scheme shown in 1b is reacted, and the feed rate of the feed port of the first reaction zone is 800kg / h respectively, that is, K1=0.8, then according to the formula 50(1-K1)+245≤T1≤50(1-K1)+ 285 calculation can get 255≤T1≤295, T1 is 255, 275, 295 respectively. Then the results of outlet temperature point temperature, hot spot temperature and methanol conversion rate of each reaction zone are shown in Table 2:

[0037] Table 2

[0038] a section of exit Second exit Three exits Fourth exit Fifth exit Six exits hot spot temperature methanol conversion T1＝255 302 307 325 341 352 358 358 85.3％

[0039] T1＝275 321 322 340 355 366 374 374 85.4％ T1＝295 340 338 355 369 380 380 380 85.5％

Embodiment 3

[0041] Based on 1000kg / h pure methanol feed, n is taken as 4, according to Figure 1a Or the scheme shown in 1b is reacted, and the feeding amount of the feed port of the first reaction zone is respectively 700kg / h, that is, K1=0.7, then according to the formula 50(1-K1)+245≤T1≤50(1-K1)+ 285 calculation can get 260≤T1≤300, T1 is 260, 280, 300 respectively. Then the results of outlet temperature point temperature, hot spot temperature and methanol conversion rate of each reaction zone are shown in Table 3:

[0042] table 3

[0043] a section of exit Second exit Three exits Fourth exit hot spot temperature methanol conversion T1＝260 325 331 341 344 344 82.3％ T1＝280 343 346 355 356 356 82.6％ T1＝300 362 361 358 369 369 83.2％

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Abstract

The invention relates to a method for controlling reaction temperature in the preparation of dimethyl ether from methanol, and mainly solves the problems of an existing reaction apparatus for the preparation of dimethyl ether from methanol, such as large temperature differences of catalyst beds, high hot-spot temperature, high feed energy consumption, proneness to temperature runaway during reaction, proneness of catalysts to aging, and short service lives of the catalysts. The method includes measures: n reaction zones BED1-BEDn from top to bottom are sequentially arranged in a multi-section fixed-bed reactor, the sum of the feed quantities F1-Fn of the various reaction zones is F0, and the value of a feed distribution proportion Kn of the bed BEDn is equal to the ratio of the Fn to the F0. The method is characterized in that according to the technical scheme, the feed temperature T1 of the first bed BED1 is controlled by means of adjusting distribution proportion K1. The method has the advantages that the problems can be effectively solved by the aid of the method, and the method can be applied to the industrial production for the preparation of dimethyl ether from methanol and the preparation of propene from methanol.

Description

technical field [0001] The invention relates to a method for controlling the reaction temperature of methanol to dimethyl ether. [0002] technical background [0003] Propylene is a basic organic chemical raw material in great demand, mainly from petroleum processing. With the increasing shortage of petroleum resources, the development of the technology of producing propylene from non-petroleum resources such as coal or natural gas has attracted more and more attention at home and abroad. The production of propylene (MTP) from methanol is the most promising new technology to replace the petroleum route. It is a mature process technology to produce synthesis gas from coal or natural gas, and then to produce methanol and dimethyl ether from the synthesis gas. Therefore, the production of propylene from methanol is a key technology in the coal-to-olefins route. [0004] In recent years, the application of German Lurgi MTP process technology in the Shenhua Ning coal-based ole...

Claims

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Application Information

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IPC IPC(8): C07C41/09C07C43/04
CPCC07C41/09C07C43/043
Inventor 胡帅金鑫杨卫胜
Owner CHINA PETROLEUM & CHEM CORP
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