Process for composite solvent for separating arylhydrocarbon by extraction and distillation

A technology of extractive distillation and compound solvent, which is applied in the directions of distillation purification/separation, extractive distillation, azeotropic/extractive distillation, etc. It can solve the problems of high operating severity of the recovery tower and the temperature of the recovery tower should not be too high

Inactive Publication Date: 2004-10-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] In the existing process of using a single extraction and distillation solvent, in the solvent recovery process, due to the limitation of the thermal decomposition temperature of the solvent, the temperature of the recovery tower cannot be too high, so it is necessary to increase the vacuum degree to ensure that the solvent in the rich solvent is completely separated from the aromatics , the operating severity of the recovery tower is higher

Method used

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  • Process for composite solvent for separating arylhydrocarbon by extraction and distillation

Examples

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example 1

[0022] Benzene is recovered from the benzene fraction of cracking hydrogenated gasoline. The composition of raw materials used is shown in Table 2. The composite solvent used consists of: sulfolane as the main solvent, a mixture of o-xylene and cumene as a cosolvent, and a modifier of N -Formylmorpholine, the content of each component in the composite solvent is listed in Table 1. use figure 1 The process flow shown, the operating conditions of the extractive distillation tower and the solvent recovery tower are shown in Table 3, and the separation results of aromatics are shown in Table 4.

example 2

[0024] Oil C from reforming 6 Benzene products are recovered in the distillate, still using figure 1 process flow. The main solvent of the composite solvent is sulfolane, the auxiliary solvent is o-xylene and cumene, and the modifier is N-methylpyrrolidone. The composition is shown in Table 1, and the raw material composition is listed in Table 2. Extractive distillation tower, solvent recovery tower See Table 3 for the operating conditions and Table 4 for the aromatics separation results.

[0025] As can be seen from the data in Table 3 and Table 4, for the reformed oil with relatively low aromatics content, the composite solvent of the present invention is used for extractive distillation, and when the operating conditions of the recovery tower are relatively mild, not only can it be operated and controlled very stably , and the benzene product with a purity of 99.98% and a sulfur content of 0.2ppm can be obtained with a high recovery rate of 99.6%, and the content of arom...

example 3

[0027] Reclaim benzene from cracking hydrogenated gasoline benzene fraction, raw material used and operating condition are all with example 1, difference is that the main solvent of composite solvent is sulfolane, cosolvent is o-xylene and cumene, without modifier, Its composition is shown in Table 1, and the separation results of aromatics are shown in Table 4.

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Abstract

A composite solvent for separating arylhydrocarbon by extraction and distillation contains main solvent, cosolvent and modifier. The said cosolvent (3-39 wt.%) is chosen from one or two kinds of C8-C11 arylhydrocarbons. If one kinds of arylhydrocarbon is chosen, the ratio of modifier to cosolvent is 0.01-10 wt.%. If two kinds are chosen, its ratio is 0-10.0 wt.%. The main solvent and the modifier are respectively chosen from cyclobutylsulfone, N-formylmorpholine or N-methyl pyrrolidone, but have opposite pH values. Its advantage is raised output rate of arylhydrocarbon.

Description

technical field [0001] The invention relates to a composite solvent used for separating aromatic hydrocarbons from hydrocarbon mixtures by means of extractive distillation. Background technique [0002] The methods for separating aromatics from hydrocarbon mixtures such as catalytically reformed gasoline or pyrolysis hydrogenated gasoline mainly include liquid-liquid extraction and extractive distillation. The most widely used selective solvents for liquid-liquid extraction are glycols or sulfolane. Although liquid-liquid extraction can obtain high-purity benzene, toluene and xylene (BTX) products with relatively high yields, the existing liquid-liquid extraction process is suitable for processing raw materials with an aromatic content of 30-70 wt%. Raw materials greater than 70wt% need to be blended with raffinate, which increases energy consumption and reduces device efficiency. [0003] Extractive distillation is a method of separating aromatics from hydrocarbon mixture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/40C07C7/08C07C15/04C07C15/06C07C15/08C10G7/08C10G21/20C10G21/22C10G21/27
CPCC10G7/08B01D3/40C10G21/27
Inventor 田龙胜唐文成赵明张云明边志凤孙惠霞邬时津
Owner CHINA PETROLEUM & CHEM CORP
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