Novel extraction process for aromatic hydrocarbons

A technology of aromatics extraction and new technology, which is applied in the chemical industry, hydrocarbon purification/separation, sustainable manufacturing/processing, etc., can solve the problems of equipment maintenance cost and difficulty increase, product quality decline, pipeline blockage, etc., and achieve good Energy-saving effect and economic benefits, less solvent decomposition, and lower operating costs

Inactive Publication Date: 2015-11-25
BEIJING HUAHETUO TECH DEV CO LTD
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Problems solved by technology

However, the degradation products of sulfolane are easy to polymerize into macromolecular acidic substances at high temperatures, corrode equipment, block pipelines, reduce product quality, and increase equipment maintenance costs and difficulties.

Method used

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  • Novel extraction process for aromatic hydrocarbons

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the devices and implementation cases of the accompanying drawings, but does not impose any limitation on the present invention.

[0015] The energy-saving production process for extracting aromatics is composed of a depentanizer, an extractive distillation tower, a solvent recovery tower, a benzene tower four-tower system and other auxiliary devices. The raw material enters the depentanizer C-101 after being preheated, and cyclopentane is removed at the top of the depentanizer, and the bottom material enters the extractive distillation tower C-102 and the solvent fed from the side line of C-102 for mixed extraction , the top of the extractive distillation tower removes non-aromatic hydrocarbons, and the liquid at the bottom of the tower enters the solvent recovery tower C-103. The solvent recovery tower strips the aromatic components from the rich solvent through the bottom reboiler, and the lean ...

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Abstract

The invention relates to a novel extraction process for aromatic hydrocarbons. Key improvements in the novel extraction process are that a depentanizing tower, an extracting and rectifying tower, a solvent recovering tower and a benzene tower employ novel inward-bending arc fin flat-ring filling material and a unique liquid distribution apparatus and filling material support apparatus are cooperatively used, so resistance drop, a pressure drop ratio and loads of the towers are effectively reduced and production capacity is substantially improved. The depentanizing tower and the extracting and rectifying tower employ main and assistant reboilers for heat adjustment, so optimization of heat supply is realized and long-period stale operation of the towers is guaranteed. Meanwhile, since a sulfonic acid ionic liquid is used as a cosolvent, influence of decomposition and corrosion of the solvent is reduced, usage cost of equipment is lowered, the service life of the solvent is prolonged, the problems of high contents of aromatic hydrocarbons and napthene and easy azeotropy of aromatic hydrocarbons in the extracting process of aromatic hydrocarbons are effectively overcome, investment cost and operation cost of the facilities are substantially reduced, and substantial economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry and coal chemical industry, and specifically relates to the research and improvement of a new process for extracting aromatic hydrocarbons. Background technique [0002] Light aromatics, namely benzene, toluene, and xylene (BTX), are not only important chemical raw materials, but also the basic raw materials for the three major synthetic materials and fine chemicals. The world's BTX resources mainly come from reformed oil from petroleum fractions, ethylene by-product pyrolysis gasoline and coal tar. With the establishment and development of large-scale ethylene plants, the proportion of BTX recovered from pyrolysis gasoline will continue to rise. Whether recovering BTX from reformed oil or pyrolysis gasoline, aromatics extraction technology has become an indispensable means. Aromatics extraction provides high yields and high purity of benzene, toluene and various isomeric C8 aroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/04C07C15/06C07C7/00C07C7/04
CPCY02P20/10Y02P20/54
Inventor 叶小琳华超
Owner BEIJING HUAHETUO TECH DEV CO LTD
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