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Combined process for conversion of C10+ heavy aromatics to light aromatics

A technology for lightening heavy aromatics and a combined process, which is applied in the field of oil refining, can solve the problems of difficult ring opening of polycyclic aromatics, low reaction conversion rate, and no competitive advantage, etc., and achieves strong lightening ability, high conversion rate, and reduced Effect of Hydrogenation Saturation Loss

Active Publication Date: 2015-02-18
CHINA NAT OFFSHORE OIL CORP +3
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Problems solved by technology

Tracing it to its cause, in order to ensure that the liquid does not absorb too many saturated aromatic rings, the reaction pressure adopted is relatively low, and under this condition, the ring-opening of condensed ring aromatics is relatively difficult, so the reaction conversion rate is low, and the disproportionation of toluene and heavy aromatics Compared with transalkylation technology, there is no competitive advantage

Method used

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  • Combined process for conversion of C10+ heavy aromatics to light aromatics
  • Combined process for conversion of C10+ heavy aromatics to light aromatics
  • Combined process for conversion of C10+ heavy aromatics to light aromatics

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Embodiment 1～3

[0030] C using a fixed bed reactor 10 + Investigation of combined process of selective hydrogenation and transalkylation of heavy aromatics. Among them, the selective hydrogenation catalyst for fused ring aromatics (noble metal Pt content 0.1%) was prepared according to the method in patent CN103551180A, and the heavy aromatics transalkylation catalyst and non-aromatic cracking catalyst were self-made in the laboratory. The feed to the reactor is from the top to the bottom, and the composition of the liquid product is analyzed by gas chromatography and chromatography-mass spectrometry.

[0031] C 10 + Heavy aromatics conversion, mixed xylene selectivity, C 9 Aromatic selectivity is defined as:

[0032] C 10 + Conversion of heavy aromatics = (C in the feed 10 + Mass of heavy aromatics - C in the product 10 + Heavy aromatics mass) / C in the feed 10 + Mass of heavy aromatics × 100%

[0033] Mixed xylene selectivity=the quality of mixed xylene in the product / (total ma...

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Abstract

The invention discloses a combined process for conversion of C10+ heavy aromatics to light aromatics, and mainly provides a production process capable of processing C10+ heavy aromatics, especially C10+ heavy aromatics enriched in condensed-nuclei aromatics, with high C10+ heavy aromatics conversion rate, mixed xylene selectivity, C9 aromatic fraction selectivity and low aromatic loss, solving the problem that the C10+ heavy aromatics cannot be effectively utilized. The method comprises the following steps: firstly performing condensed-nuclei aromatics selective hydrogenation ring-opening reaction on the C10+ heavy aromatics having high condensed-nuclei aromatics content in a selective hydrogenation reactor so that the condensed-nuclei aromatics become mononuclear aromatics with alkyl side chain, feeding the product in a light reactor, performing alkyl transfer reaction of the mononuclear heavy aromatics and light aromatics and the non-aromatics cracking and aromatization reaction under the hydrogen atmosphere to finally realize the aim of high C10+ heavy aromatics conversion rate and high aromatics purity, and prolific high value-added mixed xylene and C9 aromatics fraction at the same time.

Description

technical field [0001] The invention relates to the technical field of oil refining, and is a C 10 + A combined process method for lightening heavy aromatics; specifically, a C 10 + Production of high-purity, high value-added mixed xylenes and C by lightening heavy aromatics 9 Combined process method for aromatic fractions. technical background [0002] Due to the limited oil resources in the world and the continuous deepening of heavy and inferior oil products, increasing the deep conversion of inferior oil products and increasing the production of high value-added light oil products have become a major development strategy for the current oil refining industry. [0003] Heavy aromatics are a kind of precious petrochemical resources. Due to their complex composition and the existence of various isomers, the production of fine chemical products by rectification and separation requires high energy consumption and difficult separation; the existing heavy aromatics are ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/04
CPCC10G69/04C10G2300/1096C10G2400/30
Inventor 于海斌冯书辉臧甲忠范景新杨卫东宫毓鹏李响郑修新成宏李佳
Owner CHINA NAT OFFSHORE OIL CORP
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