Method for separating arene by extraction and rectification
A technology for extractive distillation and separation of aromatics, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of adding water stripping towers, difficulty in obtaining high-purity aromatics, increased investment and energy consumption, etc., to avoid pollution and enhance solvents Selectivity, energy saving effect
Inactive Publication Date: 2004-11-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The problem with these processes is that it is difficult to obtain high-purity aromatics, especially high-purity benzene and toluene products
Another treatment method is to set up a water stripper to strip the non-aromatics in the water, and then recycle the purified water to the recovery tower. Although this avoids the pollution of a small amount of non-aromatics to aromatics, it needs to increase the water stripper and other facilities, increasing investment and energy consumption
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example 1
[0024] according to figure 1The process uses pyrolysis hydrogenated gasoline as raw material, extracts and rectifies to recover pure benzene and toluene, and uses sulfolane as solvent, which contains a small amount of water. The composition and flow rate of the raw materials and C6-C7 fractions obtained after pre-fractionation are shown in Table 1, the main operating conditions are shown in Table 2, and the results of extractive distillation are shown in Table 3.
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The arene extracting, rectifying and separating process includes pre-distilling arene containing mixture to prepare C6-C7 fraction and C8 fraction; introduing the C6-C7 fraction to middle part of extracting and rectifying tower to contact with selective solvent introduced from upper part for extraction and rectification; introducing the tower bottom effluent to recovering tower for separating arene from the solvent; separating the top effluent from the extracting and rectifying tower to obtain non-arene exhaust system and injecting water into poor solvent; condensating the top effluent from recovering tower to separate arene system while introducing water to recovering tower for re-use; and returning the bottom obtained poor solvent from the recovering tower to extracting and rectifying tower for reuse. The said process is suitable for recovering high purity benzene and toluene from hydrocarbon mixture with high arene content and has simple operation and low power consumption.
Description
technical field [0001] The invention relates to a method for extracting and rectifying the separation of aromatics, specifically, a method for mixing water into a solvent to improve solvent selectivity, thereby improving the separation efficiency of aromatics. Background technique [0002] There are two main methods for separating aromatics, namely benzene (B), toluene (T) and xylene (X) from reformed oil or pyrolysis hydrogenated gasoline. One is the liquid-liquid extraction method, which is essentially a combined process of liquid-liquid extraction and extractive distillation. The other type is extractive distillation. Compared with the liquid-liquid extraction method, the extractive distillation method has the advantages of simple process and operation, low equipment investment, and low energy consumption, and is especially suitable for recovering aromatics from hydrocarbon mixtures with high aromatic content. Since xylene is mainly used as a raw material for the produc...
Claims
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IPC IPC(8): C07C7/08C07C15/02
Inventor 田龙胜唐文成赵明
Owner CHINA PETROLEUM & CHEM CORP
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