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Method and apparatus for preparing p-xylene from methanol

A technology of p-xylene and methanol, applied in the field of producing p-xylene, can solve the problems of low comprehensive utilization rate of by-products, poor selectivity of xylene, etc., and achieve good economic benefits, increase yield, and simple operation

Active Publication Date: 2015-09-09
LUOYANG PETROCHEMICAL ENG CORP SINOPEC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and device for producing p-xylene from methanol to solve the problems of poor p-xylene selectivity and low comprehensive utilization rate of by-products existing in methanol aromatization technology

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  • Method and apparatus for preparing p-xylene from methanol
  • Method and apparatus for preparing p-xylene from methanol

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Embodiment 1

[0037] use figure 1 The device shown in the present specification is subjected to a pilot test according to steps A to G of the method for producing p-xylene from methanol according to the present invention described in the specific embodiment section. In step A, the reaction temperature of the methanol aromatization reaction is 380°C, and the feed weight space velocity is 1.0h -1 , the reaction pressure is 1.5MPa. The catalyst used for the methanol aromatization reaction is the ZnHZSM-5 catalyst described in "Research on the methanol aromatization reaction on ZnHZSM-5" in "Journal of Fuel Chemistry" No. 5, 2009, with a Zn loading of 2.0w%.

[0038] In step D, the reaction temperature for the aromatization reaction of low-carbon hydrocarbons is 360°C, and the weight space velocity of the feed is 0.5h -1 , the reaction pressure is 0.4MPa. The liquefied gas feed accounts for 15w% of the total feed to the low-carbon hydrocarbon aromatization reactor. The catalyst used for the...

Embodiment 2

[0043] According to Example 1, only the reaction temperature of the methanol aromatization reaction is 300°C, and the feed weight space velocity is 0.5h -1 , the reaction pressure is 0.5MPa. The reaction temperature of low-carbon hydrocarbon aromatization reaction is 300°C, and the feed weight space velocity is 0.3h -1 , the reaction pressure is 0.2MPa.

Embodiment 3

[0045] According to Example 1, only the reaction temperature of the methanol aromatization reaction is 350°C, and the feed weight space velocity is 1.0h -1 , the reaction pressure is 1.0MPa. The reaction temperature of low carbon hydrocarbon aromatization reaction is 380°C, and the feed weight space velocity is 0.6h -1 , the reaction pressure is 0.4MPa.

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Abstract

The present invention discloses a method and an apparatus for preparing p-xylene from methanol. The method is mainly characterized in that first methanol feedstock produces a methanol aromatization reaction in a methanol aromatization reactor (2), and liquefied gas feedstock, a methanol aromatization gas product and non-aromatic raffinate oil separated from an aromatic hydrocarbon extraction apparatus produce a low-carbon hydrocarbon aromatization reaction in a low-carbon hydrocarbon aromatization reactor (6); second methanol feedstock as well as benzene and methylbenzene separated from an aromatic hydrocarbon rectifying tower (12) produce an alkylation reaction in an alkylation reactor (19), o-xylene, m-xylene and ethylbenzene separated from the aromatic hydrocarbon rectifying tower produce an isomerization reaction in an isomerization reactor (20), and fresh raw material benzene as well as C9 and aromatic hydrocarbons separated from the aromatic hydrocarbon rectifying tower produce a transalkylation reaction in a transalkylation reactor (21). P-xylene (13) separated from the aromatic hydrocarbon rectifying tower serves as a product. The present invention discloses the related apparatus. The method and the apparatus can produce p-xylene as much as possible.

Description

technical field [0001] The invention belongs to the technical field of producing p-xylene from methanol, and relates to a method and a device for producing p-xylene by using methanol as a raw material. Background technique [0002] Paraxylene (PX) is an important basic organic chemical raw material, mainly used in the production of terephthalic acid (PTA). At present, p-xylene mainly comes from gasoline cracking, catalytic reforming and other processes; in addition, toluene disproportionation or selective toluene disproportionation, alkylation transfer, mixed xylene isomerization, adsorption separation, crystallization separation, etc. are also important means to increase p-xylene production . However, what the above-mentioned process obtains are all C8 mixed aromatics, p-xylene only accounts for 4.2w% in pyrolysis gasoline, accounts for 7.5w% in reformed oil, and accounts for 22~26w% in C8 mixed aromatics. higher. With the increasing depletion of petroleum resources, obt...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C1/20C07C2/88C07C5/27
Inventor 李康魏小波郝代军
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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