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Method for producing paraxylene

A technology for p-xylene and production methods, which is applied in chemical instruments and methods, hydrocarbons, and isomerization to produce hydrocarbons, etc., can solve the problems of long xylene loop, energy consumption, material consumption, etc. The effect of low consumption and simplified separation process

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

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there is a long xylene circuit in the existing aromatics complex, and the problem of high energy consumption and material consumption is to provide a low-energy p-xylene production method

Method used

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  • Method for producing paraxylene
  • Method for producing paraxylene
  • Method for producing paraxylene

Examples

Experimental program
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Effect test

Embodiment 1

[0022] to reform C 6 + as the raw material, and the composition of the raw material is shown in Table 1.

[0023] process such as figure 1 shown. Fresh reformed C 5 + The raw material 100t / h enters the reforming depentanizer, and the C 5 Component 5.9t / h, bottom C 6 +Enter the raw material separation tower, and take out C from the top of the raw material separation tower 6 - Components, enter the depentanizer, and extract C from the top of the tower 5 -Components, the tower bottom components enter the aromatics extraction unit to obtain benzene products with a purity of 99.9%. Raw material separation tower side line extraction C 7 Components (containing 2wt%C 6 components and 3wt% non-aromatics) and the C extracted from the side line of the heavy aromatics tower 9 -C 10 Aromatics and hydrogen are mixed and enter the disproportionation and transalkylation unit, and the reaction liquid product is returned to the raw material separation tower. The bottom component of...

Embodiment 2

[0032] to reform C 9 +It is raw material, and raw material composition is as shown in table 4.

[0033] process such as figure 1 shown. Fresh reformed C 9 + The raw material 100t / h enters the raw material separation tower, and the top of the raw material separation tower takes out C 6 - Components, enter the depentanizer, and extract C from the top of the tower 5 -Components, the tower bottom components enter the aromatics extraction unit to obtain benzene products with a purity of 99.9%. Raw material separation tower side line extraction C 7 Components (containing 1wt%C 6 components and 2wt% non-aromatics) and the C extracted from the side line of the heavy aromatics tower 9 -C 10 Aromatics and hydrogen are mixed and enter the disproportionation and transalkylation unit, and the reaction liquid product is returned to the raw material separation tower. The bottom component of the raw material separation tower enters the xylene tower after being treated by the deolef...

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Abstract

The invention relates to a paraxylene production method, and mainly solves the technical problems of long xylene loop, high investment and high energy consumption in the past aromatic hydrocarbon combination unit. The method comprises the following steps: C5 and above components from a reformer are sent to a raw material separation region to sequentially separate out C6 and below components and C7, C8 and above components; the C6 and below components are sent to a depentanizer to obtain a pure benzene product; the C7 components are sent to a disproportionation and alkyl transfer unit to generate a mixture I containing benzene, toluene, xylene, C9 and above aromatic hydrocarbons and non-aromatic hydrocarbons, and the mixture I is returned to the raw material separation region; the C8 and above components are sent into a xylene tower for separation to obtain a paraxylene product, absorption excess oil enters an isomerization unit to obtain mixed xylenes, and the mixed xylenes are returned to the raw material separation region; and the C9 and above components obtained from the tower bottom are sent into a heavy aromatic hydrocarbon tower, and the C9 and C10 components obtained from the tower top are mixed with the C7 components and returned for disproportionation. The technical scheme well solves the technical problems, and can be used for industrial production of paraxylene.

Description

technical field [0001] The invention relates to a method for producing p-xylene with low energy consumption. 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. Using toluene and carbon nine and above heavy aromatics (C 9 + A) The increase of xylene production by transalkylation reaction is a method of effectively utilizing heavy aromatics to increase the production of xylene, and it is widely used. Industrially, PX products are mainly produced through aromatics complexes. Traditional aromatics complexes include unit processes such as reforming, disproportionation and transalkylation, isomerization, aromatics extraction, and PX separation. PX and benzene are produced as final products. The aromatics produced by the reforming unit, the products generated by the disproportionati...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C15/04C07C6/12C07C5/27
Inventor 郭宏利李经球孔德金杨德琴李华英
Owner CHINA PETROLEUM & CHEM CORP
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