Method for recovering aromatic hydrocarbons from gasoline containing olefin and sulfide
A technology for sulfide and gasoline, applied in the field of recovering aromatic hydrocarbons, can solve the problems of large hydrogen consumption of hydrogenation units, increased material and solvent consumption, and increased hydrogen consumption, and achieve the effect of reducing hydrogen consumption and making full and effective use.
Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The problem of this method is that the hydrogenation unit consumes a lot of hydrogen, and the operating cost is high. In addition, due to the saturation of olefins due to hydrogenation, the octane number of the raffinate product is greatly lost, and the use value is reduced.
The method adopts extractive distillation to process the wide-range gasoline fraction rich in olefins, and has the following problems: 1) heavy olefins, alkanes and cycloalkanes with high boiling points in the raw material are enriched in the extract together with aromatics and sulfides, and the addition of The load of the hydrogen unit increases, and the hydrogen consumption increases; 2) The operating temperature of the extractive distillation tower is high, and the temperature at the bottom of the tower is generally 160-180°C. The tendency of olefin polymerization increases, and high polymers and heavy components in raw materials accumulate in the solvent. In order to maintain the quality of the solvent, solvent and water back-extraction measures are taken. The heavy oil phase component after back-extraction contains a small amount of sulfolane, which increases the consumption of materials and solvents as a waste oil discharge device.
Method used
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example 1
[0030] according to figure 1 The process recovers aromatic products from DCC gasoline, and the composition of DCC gasoline is shown in Table 1. The selective solvent used in liquid-liquid extraction and extractive distillation is sulfolane. The hydrogenation reaction used the RS-1 catalyst produced by Changling Catalyst Factory. Its composition and physical properties are shown in Table 2. The operating parameters of each tower and hydrogenation reaction are shown in Table 3. The product quality, yield and hydrogen consumption are shown in Table 4.
example 2
[0032] According to the method of example 1, recover aromatic products from DCC gasoline, the difference is to change the backwash ratio, each column and hydrogenation reaction operating parameters are shown in Table 3, and product quality, yield and hydrogen consumption are shown in Table 4.
example 3
[0034] Reclaim aromatics product from DCC gasoline according to the method of example 1, difference is to improve the temperature at the bottom of the first solvent recovery tower, reduce the first poor solvent hydrocarbon content, each tower and hydrogenation reaction operating parameters are shown in Table 3, product quality, yield The ratio and hydrogen consumption are shown in Table 4.
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The invention provides a method for recovering aromatic hydrocarbon from gasoline containing olefin and sulfide. The method comprises the following steps of: introducing the gasoline containing the olefin and the sulfide into a liquid-liquid extraction tower, discharging raffinate from the tower top, introducing a first rich solvent discharged from the tower bottom into a stripping tower, discharging non-aromatic hydrocarbon components from the top of the stripping tower through steam stripping, introducing a second rich solvent discharged from the bottom of the stripping tower into a first solvent recovery tower, introducing primary extraction oil discharged from the top of the first solvent recovery tower into a hydrogenation reactor to carry out hydrogen desulfurization, then introducing a product obtained after hydrogen desulfurization into an extraction rectifying tower, feeding a first poor solvent discharged from the bottom of the first solvent recovery tower to the upper part of the extraction rectifying tower as an extractive distillation solvent, combining non-aromatic hydrocarbon components discharged from the top of the extraction rectifying tower with non-aromatic hydrocarbon components discharged from the top of the stripping tower, returning the combined non-aromatic hydrocarbon components to the lower part of the liquid-liquid extraction tower to serve as a backwashing liquid, introducing a third rich solvent discharged from the bottom of the extraction distillation tower into a second solvent recovery tower, discharging BTX aromatics products from the tower top, and returning a second poor solvent discharged from the tower bottom to the upper part of the liquid-liquid extraction tower to serve as a liquid-liquid extraction solvent. The method can be used for reducing the consumption of hydrogen in a hydrogen desulfurization process, increasing the utility value of raffinate and improving the purity of aromatic hydrocarbons.
Description
technical field [0001] The invention relates to a method for recovering aromatics from hydrocarbon mixtures, specifically, a method for recovering aromatics from gasoline containing olefins, aromatics and sulfides by using an extraction solvent. Background technique [0002] With the development of fluid catalytic cracking (FCC) technology, especially the popularization and application of deep catalytic cracking (DCC) technology, the content of aromatics in catalytic gasoline has gradually increased, especially in DCC gasoline, the content of aromatics is higher, of which light aromatics (benzene , toluene, xylene, referred to as BTX) content can reach 50% by mass. On the one hand, light aromatics (BTX) is an important organic chemical raw material, and the market demand is increasing year by year. Recovering light aromatics from catalytic gasoline can broaden the source of light aromatics, which is in line with the development trend of refining and chemical integration; on ...
Claims
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IPC IPC(8): C10G67/04C07C15/02C07C7/08C07C7/163C07C7/10
Inventor 唐文成田龙胜赵明张云明边志凤
Owner CHINA PETROLEUM & CHEM CORP