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
CN1740124AActive Publication Date: 2006-03-01CHINA PETROCHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROCHEMICAL CORP
Publication Date
2006-03-01

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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.
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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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