Processing method of ethylene tar

Abstract

The invention discloses a processing method of ethylene tar. The method consists of: fractionating ethylene tar into light fraction and heavy fraction, mixing the heavy fraction with a conventional coking raw material, conducting delayed coking to obtain coker gasoline, coker diesel oil and coker gas oil, mixing the obtained coker gasoline and coker diesel oil with the ethylene tar light fraction, leaving the mixture to undergo a hydrofining reaction, distilling the product to obtain gasoline fraction I and fraction heavier than gasoline; mixing the fraction heavier than gasoline with the coker gas oil, and subjecting the mixture to hydrotreating so as to obtain gasoline fraction II and a diesel oil product, and mixing the gasoline fraction I with the gasoline fraction II to obtain a final gasoline product. Directed at the characteristics of high content of aromatic hydrocarbon, colloid, carbon residue and asphaltene in ethylene tar, the method provided in the invention fractionates the ethylene tar into light fraction and heavy fraction, adopts different processing processes, increases the added value of ethylene tar, enhances the yields of gasoline and diesel oil, improves the product quality of light fuel oil, and also enables the equipment to run smoothly for a long period.

Description

technical field

[0001] The invention relates to a processing method of ethylene tar, in particular to a combined process method of delayed coking and hydrogenation for blending ethylene tar. Background technique

[0002] The increasing shortage of world oil resources and the increasing price make it necessary for refineries to reduce emissions and increase efficiency. Ethylene tar is currently mainly sold as heavy fuel oil or carbon black raw materials, with low added value.

[0003] Ethylene tar is a high-temperature condensation product of ethylene cracking raw materials and products in the steam cracking process. Its initial boiling point is 170-260°C, and its final boiling point is >600°C, generally 600-700°C. It belongs to the heavy fraction range. Ethylene tar is mainly a mixture of double-ring or more fused-ring aromatics, with an aromatic content of more than 90% and a density (20°C) greater than 1.0 g / cm 3 , Low content of impurities such as sulfur and nitrogen,...

Images