System for recycling condensate of extraction torch tank

Abstract

A system for recycling condensate of an extraction torch tank comprises the extraction torch tank, a wet solvent tank, a torch tank condensate pump, a torch tank condensate pipeline, an extraction solvent circulating pipeline, a lean solvent pump, an extraction distilling tower, an extraction distilling tower reboiler, a non-aromatic steam pipeline and a non-aromatic distilling tower; the wet solvent tank is connected to the extraction torch tank, the extraction torch tank is connected to the torch tank condensate pump through a pipeline, the torch tank condensate pump is connected to the extraction solvent circulating pipeline through the torch tank condensate pipeline, one end of the extraction solvent circulating pipeline is connected to the lean solvent pump, the other end of the extraction solvent circulating pipeline is connected to the extraction distilling tower, the top of the extraction distilling tower is connected to the non-aromatic distilling tower through the non-aromatic gas pipeline, and the lower portion of the extraction distilling tower is connected to the extraction distilling tower reboiler. The problem is solved that mixed aromatic products are easily unqualified since condensate in the extraction torch tank is recycled by being discharged to an underground solvent tank, and the non-aromatic content of extraction mixed aromatic products is increased.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a recovery and reuse system for extraction condensate. Background technique [0002] The aromatics extraction unit is a production unit of the complex. The unit adopts the sulfolane extractive distillation (SED) process of Sinopec Research Institute of Petrochemical Technology (RIPP) to reform gasoline C from the upstream 6 ~C 7 Mixed aromatics (benzene and toluene) and non-aromatics are separated from distillate and xylene isomerization light hydrocarbons. The produced mixed aromatics are sent to the aromatics rectification part for further separation to obtain benzene and toluene products, and non-aromatics are directly sent to the product tank farm as by-products. [0003] Light aromatics (benzene, toluene) mainly come from catalytic reforming to produce oil and pyrolysis hydrogenated gasoline by-product of ethylene plant. Solvent extraction (liquid-liquid ex...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing system is likely to cause unqualified mixed aromatic products, the condensate in the extraction torch tank is improved to the extraction distillation tower after being pressurized by the torch tank condensate pump in the present invention, and the condensate in the torch tank is recovered.

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