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Combined method for producing p-xylene

A p-xylene and toluene technology, applied in the field of producing high-purity benzene products and p-xylene products, can solve the problems of demanding reaction raw materials, large investment, and low recycling rate of heavy components

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problems to be solved by the present invention are the problems of long process flow, large investment, harsh requirements for reaction raw materials, low recycling rate of heavy components, and high energy consumption in traditional aromatics complexes

Method used

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  • Combined method for producing p-xylene
  • Combined method for producing p-xylene
  • Combined method for producing p-xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] to reform C 6 + as the raw material, and the composition of the raw material is shown in Table 1.

[0034] process such as figure 1 shown. Fresh reformed C 6 + 100t / h of raw material and 10.3t / h of circulating heavy aromatics tower and bottom material, and lower purity hydrogen (hydrogen purity of 80mol%) from disproportionation and alkylation transfer into the catalytic hydrogenation unit for reaction, fresh hydrogen 6.34t / h ( Hydrogen purity is 93mol%), circulating toluene and carbon nine components containing a small amount of carbon ten aromatic hydrocarbons enter the disproportionation and transalkylation unit together, the two reaction units discharge a small amount of light products, and the liquid phase reaction products enter the rectification unit in turn Benzene tower, toluene tower, xylene tower and heavy aromatics tower are separated, and high-purity benzene product (benzene purity is 99.9wt%) is produced at the top of the benzene tower, and 26.4t / h of...

Embodiment 2

[0044] to reform C 9 + It is raw material, and raw material composition is as shown in table 4.

[0045] process such as figure 1 shown. Fresh reformed C 9 + 100t / h of raw material and 13.9t / h of circulating heavy aromatics tower and bottom material, and lower purity hydrogen (hydrogen purity of 80mol%) from disproportionation and alkylation transfer into the catalytic hydrogenation unit for reaction, fresh hydrogen 8.46t / h ( Hydrogen purity is 93mol%), circulating toluene and carbon nine components containing a small amount of carbon ten aromatic hydrocarbons enter the disproportionation and transalkylation unit together, the two reaction units discharge a small amount of light products, and the liquid phase reaction products enter the rectification unit in turn Benzene tower, toluene tower, xylene tower and heavy aromatics tower are separated, and high-purity benzene product (benzene purity is 99.9wt%) is produced at the top of the benzene tower, and 28.0t / h of toluene ...

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Abstract

The invention relates to a combined method for producing p-xylene. The problems of long flow, huge investment, strict requirements on reaction raw materials, low heavy component recycling rate and high energy consumption of a conventional combined arene device are mainly solved. According to the technical scheme, the method comprises the following steps: causing products with 6 carbon atoms and more than 6 carbon atoms from a reformer and hydrogen to enter a catalytic hydrogenation unit, and performing non-aromatic hydrocarbon pyrolysis, heavy aromatic hydrocarbon dealkylation and transalkylation reaction to generate a mixture containing benzene, boluene, C8 aromatic hydrocarbon, C9 aromatic hydrocarbon and C10 aromatic hydrocarbon; causing the mixture to sequentially enter a benzene tower, a boluene tower and a xu;eme tower for adsorptive separation; causing the boluene to enter a crystallization unit, causing the boluene-containing C8 aromatic hydrocarbon to enter an isomerization unit, and returning obtained mixed boluene to return to a heavy aromatic hydrocarbon tower for separation; causing the boluene to enter the crystallization unit, obtaining a p-xylene product and C8 aromatic hydrocarbon, and returning the C8 aromatic hydrocarbon to an adsorptive separation unit. According to the method, the technical problems are well solved, and the method can be used for the industrial production of p-xylene.

Description

technical field [0001] The present invention relates to a kind of combined method of producing p-xylene, more specifically by combining catalytic hydrogenation unit, disproportionation and transalkylation unit, p-xylene adsorption separation unit, crystallization unit and C8 aromatics isomerization unit Combined to produce a method for obtaining high-purity benzene products and para-xylene products. Background technique [0002] P-xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. A typical paraxylene (PX) production unit usually includes six units including catalytic reforming of naphtha, xylene fractionation, aromatics extraction, toluene disproportionation and transalkylation, adsorption separation, and isomerization. [0003] The extraction of aromatics requires a complex solvent extraction device, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C5/27C07C6/00C07C15/04C07C4/06
Inventor 李木金杨卫胜贺来宾黄云群
Owner CHINA PETROLEUM & CHEM CORP