Fine separation device and separation method for olefin catalytic cracking products

Abstract

The invention discloses a fine separation device and a separation method for olefin catalytic cracking products, and belongs to the field of chemical process. The separation device comprises a hexaneremoval apparatus arranged between a depropanization tower and a debutanization tower, wherein the hexane removal apparatus comprises a reboiler, a hexane removal tower, hexane removal tower bottom liquid cooling equipment, a hexane removal tower condenser, a hexane removal tower reflux tank and a reflux pump which are communicated with one another through pipelines. The invention also discloses aseparation method suitable for the fine separation device, and the method can realize fine separation of C6+ in olefin catalytic cracking byproducts in an OCC technology. According to the scheme, thefine separation device and the separation method can realize fine separation of C4 to C6+ components, complete conversion of economic added values of products from low to high, and facilitate high economic added value utilization of C6+ products.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to an olefin catalytic cracking product fine separation device and separation method. Background technique [0002] Aromatic hydrocarbons are important basic raw materials for the production of bulk petrochemical products in the world today, and polymers produced from aromatic hydrocarbons have played an important role in modern life. At present, the main products of aromatics in the world are light aromatics such as benzene, toluene, and xylene; aromatics are important basic raw materials for the petrochemical industry. Among the total of about 8 million known compounds, aromatics account for about 30%, of which BTX aromatics ( Benzene, toluene, xylene) are called primary basic organic raw materials. The use of aromatic resources can extend the development of multiple series of product chains, and its use has been extended to synthetic resins, coatings, fuels, medicines and othe...

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Problems solved by technology

[0003] C4 and above C5 fractions are by-products of the olefin catalyst cracking process. At present, the C5 and above fractions on the market are mainly used as industrial and civil fuels and gasoline additives. With the continuous rise of crude oil prices in recent years, the economics of the downstream use of this resource is debatable; As an important organic chemical raw material, aromatic hydrocarbons have high economic added value. However, in the existing olefin catalytic cracking technology, the fraction above C5 contains aromatic hydrocarbon components, but the purity is not high, which cannot meet the standards for organic chemical raw materials and cannot be effectively reflected. Its market value, and there is no fine separation technology for fractions above C5 in the prior art. Therefore, it is urgent to design a device that can finely separate C4 to C6+ products (crude mixed benzene) in the by-products of the olefin catalyst cracking process, and then Obtain aromatics that meet the standards of organic chemical raw materials, in order to complete the conversion from low to high economic added value of products, and improve market and economic benefits

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