Method and device for preparing dimethylbenzene by alkylating benzene, methylbenzene and methanol

A technology of xylene and alkylation, which is applied in the production of xylene by the alkylation of toluene and methanol. From the field of benzene, it achieves the effects of easy operation, smooth process and high conversion rate

Pending Publication Date: 2012-10-24
NINGXIA BAOTA PETROCHEM GROUP
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  • Abstract
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Problems solved by technology

[0011] This method only solves the problem of producing toluene by alkylation of a single raw material

Method used

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  • Method and device for preparing dimethylbenzene by alkylating benzene, methylbenzene and methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Benzene is used alone as raw material, and xylene is produced by alkylation reaction with methanol. The molar ratio of fresh raw materials to recycled raw materials is 1:3-6, the molar ratio of total benzene and toluene raw materials to methanol is 4-8:1, the reaction pressure is 0.5-0.6Mpa, the temperature is 400-450°C, and the total weight of raw materials The space velocity is 0.5-1h-1, and the xylene that meets the 3°C mixed xylene product standard in the "National Standard for Petroleum Mixed Xylene" (GB / T3470-2010) is produced.

Embodiment 2

[0050] The mixed feed of benzene and toluene is used for alkylation reaction with methanol to produce xylene. The molar ratio of toluene and benzene in fresh raw materials is 1:1, the molar ratio of fresh raw materials and recycled raw materials is 1:2-4, the molar ratio of total raw materials and methanol is 3-5:1, and the reaction pressure is 0.5-0.6Mpa , the temperature is 400-450°C, the total space velocity of the raw material weight is 1-2h-1, and the xylene that meets the 3°C mixed xylene product standard in the "National Standard for Petroleum Mixed Xylenes" (GB / T3470-2010) is produced.

Embodiment 3

[0052] The mixed feed of benzene and toluene is used for alkylation reaction with methanol to produce xylene. The molar ratio of toluene and benzene in fresh raw materials is 2:1, the molar ratio of fresh raw materials and recycled raw materials is 1:1-2, the molar ratio of total raw materials and methanol is 2-4:1, and the reaction pressure is 0.5-0.6Mpa , the temperature is 400-450°C, the total space velocity of the raw material weight is 2-3h-1, and the xylene that meets the 3°C mixed xylene product standard in the "National Standard for Petroleum Mixed Xylenes" (GB / T3470-2010) is produced.

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Abstract

The invention relates to a method for preparing dimethylbenzene by alkylating benzene, methylbenzene and methanol. The method comprises the following process steps of: (1) mixing raw materials of benzene, methylbenzene, circulating benzene and methylbenzene with the methanol, wherein the circulating benzene and methylbenzene are recovered by rectification, carrying out heat exchange on mixed materials and materials at an alkylated reactor outlet, heating the materials subjected to heat exchange to reach the alkylated reaction temperature and then allowing the material to enter the alkylated reactor and carrying out an alkylation reaction to obtain a product in the presence of a catalyst; and (2) enabling the product to enter a methylbenzene-removing tower for rectifying and separating; cooling a mixture of the benzene, the methylbenzene and water at the top of the tower and then carrying out oil-water separation, enabling oil phase to return to the alkylated reactor for circulating reaction; treating water phase and then recycling; and enabling oil at the bottom of the tower to enter a dimethylbenzene rectifying tower for rectifying and separating to obtain mixed dimethylbenzene and heavy aromatic as products.

Description

technical field [0001] The present invention relates to the production technology of petrochemical products, in particular to a method and device for producing xylene by alkylation of benzene, toluene and methanol. Background technique [0002] Xylene is an important aromatic hydrocarbon. Among them, p-xylene is mainly used to produce terephthalic acid, and then produce ethylene terephthalate, a raw material for polyester. Meta-xylene is used to produce isophthalic acid, and o-xylene is used to produce phthalic anhydride, which in turn produces various plastic plasticizers. [0003] At present, the most important production route of aromatics is naphtha reforming to obtain aromatics mixture, which undergoes adsorption, freezing, rectification and other processes, and the by-products are then combined with isomerization and disproportionation. Obtain the above-mentioned products that meet the quality requirements. That is to say, all rely on the extended processing of petr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C2/86
Inventor 刘志华陈宝林
Owner NINGXIA BAOTA PETROCHEM GROUP
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