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P-xylene producing process

A p-xylene and production method technology, applied in the field of petrochemical industry, can solve the problems of large diameter and height of xylene tower, limited output of ortho-xylene, single function of ortho-xylene tower, etc., and achieve reduction of reflux ratio and reduction C8 aromatics circulation amount and the effect of reducing separation precision requirements

Active Publication Date: 2006-03-01
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

[0004] The present invention is based on the prior art, aiming at the single function of the o-xylene tower existing in the prior art, the limited output of the o-xylene, the relatively large diameter and height of the xylene tower and the C 8 A new production method of p-xylene was proposed due to the disadvantages of large aromatics circulation

Method used

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Embodiment Construction

[0013] Such as figure 1 As shown, fresh C 8 + Aromatics Feedstock 1 and Isomerization C 8 + Aromatics 9 enters the xylene tower 2, the tower top pressure of the xylene tower is 0.90MPa (gauge pressure), the tower top temperature is 251°C, the tower bottom temperature is 265~295°C, and the reflux ratio (relative to the tower top product) is 3.6 ~4.2 (weight ratio). From the top of the xylene tower is qualified C 8 Aromatics, to adsorption separation unit 3 to obtain qualified p-xylene product 4 after adsorption separation, adsorption separation unit 3 raffinate to isomerization unit 7, the C containing ortho-xylene at the bottom of the xylene tower 8 + Aromatics enter the ortho-xylene tower 5, the top pressure of the ortho-xylene tower 5 is 0.04Mpa (gauge pressure), the tower top temperature is 158°C, the tower bottom temperature is 206°C, and the reflux ratio (relative to the feed) is 1~ 3 (weight). The product coming out from the top of the ortho-xylene tower 5 direct...

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Abstract

The p-xylene producing process is superior to available technology, which has the demerits of o-xylene tower with single function, limited o-xylene product, too large size of xylene tower, etc. The p-xylene producing process includes making fresh C8+ arene material and isomeric C8+ arene from the isomerizing unit enter the xylene tower, extracting C8 arene from the tower top, adsorpting and separating in the adsorption and separation unit to obtain p-xylene product, feeding the raffinate from the adsorption and separation unit to the isomerizing unit, making C8+ arene containing o-xylene from the tower bottom to the o-xylene tower, and making the o-xylene tower top product enter to the adsorption and separation unit directly or after mixing with the raffinate from the adsorption and separation unit.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a production method of p-xylene. 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 p-xylene production method is to separate p-xylene from the remaining three isomers through multi-stage cryogenic crystallization separation or molecular sieve simulated moving bed adsorption separation technology from mixed C8 aromatics to produce high-purity Paraxylene (PX) is used as feedstock for downstream purified terephthalic acid (PTA) units. [0003] As the basic raw material of polyester industry, p-xylene (PX) has maintained a growing momentum in its market demand. Toluene, C 8 (the number of carbon atoms is 8, the same below) aromatic hydrocarbons, C 9 (Number of carbon atom...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C5/27
Inventor 杨旭东杨宝贵徐又春
Owner CHINA PETROCHEMICAL CORP
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