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Method for preparing aromatic hydrocarbon from methanol or dimethyl ether

A technology of dimethyl ether and methanol, which is applied in the field of producing aromatics from methanol or dimethyl ether, which can solve the problems of severe reaction heat release, low yield of aromatics, catalyst deactivation, etc.

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] What the present invention aims to solve is the problem that the yield of aromatics is low and the reaction exotherm is serious in the process of producing aromatics from methanol in the existing method, which leads to the rapid deactivation of the catalyst due to the overheating of the reactor, and provides a new method for producing aromatics from methanol or dimethyl ether The method, which can effectively control the heat release of the reaction, improve the utilization efficiency of heat, and promote the increase of the yield of aromatics in the product

Method used

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  • Method for preparing aromatic hydrocarbon from methanol or dimethyl ether
  • Method for preparing aromatic hydrocarbon from methanol or dimethyl ether
  • Method for preparing aromatic hydrocarbon from methanol or dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 120 grams of ZSM-5 molecular sieve, 20 grams of MCM-22 molecular sieve, 64 grams of pseudoboehmite, 4 grams of scallop powder and mix evenly, add 160 grams of dilute nitric acid solution, knead evenly, and then extrude, dry and roast into a catalyst carrier. The carrier was impregnated with a 15% zinc nitrate solution, dried and calcined to prepare the catalyst MTA-1, whose composition is shown in Table 1.

[0021]

[0022] Table 1

[0023]

[0024] Take 9 grams of catalyst MTA-1 and put it into a stainless steel fixed-bed reactor. Under the condition of 490°C and normal pressure, feed into the reactor with the weight ratio of methanol:liquefied gas (the composition is shown in Table 2) as 10:1. Make it contact with the catalyst, the reaction space velocity is 2h -1 . The reaction product directly enters the chromatographic on-line analysis through the insulated pipeline. The results are listed in Table 4.

[0025]

[0026] Table 2

[0027]

Embodiment 2-7

[0029] Adopt the method for embodiment 1 to prepare catalyst MTA-2, MTA-3, MTA-4, MTA-5, MTA-6 and MTA-7, its composition is listed in table 1, and adopts the evaluation condition consistent with embodiment 1 to carry out Aromatization reaction, the reaction results are listed in Table 4.

[0030]

Embodiment 8-14

[0035] Take 9 grams of catalyst MTA-5 and put it into a stainless steel fixed-bed reactor. Under different conditions, different raw materials and reaction accelerators are pumped into the reactor to contact with the catalyst. The reaction conditions used, reaction accelerators and their ratios are listed in Table 3. The dry gas used is separated to remove most of the hydrogen. The reaction product directly enters the chromatographic on-line analysis through the insulated pipeline. The results are listed in Table 4.

[0036]

[0037] table 3

[0038]

[0039] Comparing Example 1 and Comparative Example 1 in Table 4, it can be seen that after the introduction of the reaction accelerator and the heat balancer, the yield of the product aromatics has been significantly improved. Comparing Example 3 and Comparative Example 1 yielded the same result. In addition, the introduction of the reaction accelerator and heat balance agent not only balances the exothermic and endothe...

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Abstract

The invention relates to a method for preparing aromatic hydrocarbon from methanol or dimethyl ether and mainly aims to solve the problems of low yield of aromatic hydrocarbon, serious heat release during reaction, rapid increase of temperature of a reactor and rapid deactivation of a catalyst in the aromatization process of methanol or dimethyl ether. According to the technical scheme of the invention, methanol or dimethyl ether as a raw material is enabled to be in contact with a reaction accelerator, a heat balance agent and a catalyst in a fixed bed reactor at the reaction temperature of 350-650 DEG C, and products of reaction are separated to obtain the methanol or dimethyl ether containing aromatic hydrocarbon. By adopting the technical scheme, the problems can be well solved. The method provided by the invention can be applied to the industrial production of aromatic hydrocarbon through conversion of oxygenated chemicals.

Description

technical field [0001] The invention relates to a method for preparing aromatics from methanol or dimethyl ether. Background technique [0002] Aromatics, especially benzene (B), toluene (T) and xylene (X) are important organic chemical raw materials, widely used in many fields, and their importance is second only to ethylene and propylene. Aromatics in my country mainly come from the catalytic reforming process of petroleum routes and the process of by-product aromatics from naphtha steam cracking. However, compared with the Middle East and other places, my country's petroleum resources are obviously in short supply, which leads to the shortage of aromatics sources in my country. However, my country has abundant reserves of coal resources, and the output of methanol obtained through coal conversion is huge. Therefore, it is of great strategic significance to develop the technology of producing aromatics from methanol or dimethyl ether. [0003] US4590321 discloses a method...

Claims

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Application Information

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IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C1/20B01J29/80B01J29/40B01J29/46
CPCY02P20/52
Inventor 陈希强汪哲明肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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