Technological method for comprehensive energy consumption recovery in nitrochlorobenzene rectification separation

Abstract

The invention discloses a technology for comprehensive energy consumption recovery in nitrochlorobenzene rectification separation. The technology comprises two parts, wherein the first part is the recovery of tower top condenser heat, and the second part is the recovery of rectification tower kettle reboiler condensate water heat. The first part specifically comprises: a rectification tower and a tower top condenser finish a heat exchange unit operation, a tower top steam and water drum finishes steam and water flash evaporation separation, and a hot water circulating pump finishes a fluid conveying unit operation; the second part specifically comprises: the condensate water of the rectification tower kettle reboiler enters a first-level steam drum through a first steam trap to finish flash evaporation separation, and byproduct steam is outwards conveyed; liquid phase hot water in the first-level steam pocket enters a second-level steam pocket through a second liquid level regulation valve to finish pressure reduction flash evaporation, and byproduct steam is outwards conveyed; condensate water on the lower part of the second-level steam drum enters a hot water collection tank through a second steam trap, and the hot water of the hot water collection tank is provided for the tower top steam and water drum for supplementing water through a hot water make-up pump. According to the technology, the byproduct steam is comprehensively recovered by energy consumption, heat energy loss is avoided, electric energy is saved, and environment is protected.

Description

technical field [0001] The invention relates to a process for comprehensive energy recovery in nitrochlorobenzene rectification and separation, in particular to heat recovery of a condenser at the top of a nitrochlorobenzene rectification tower and heat recovery of condensed water in a reboiler of a tower still. Background technique [0002] Nitrochlorobenzene is an important chemical, pharmaceutical, pesticide, and dye intermediate, widely used in the synthesis of dyes, medicine, pesticides, and dyes. Nitrochlorobenzene Molecular Formula C 6 -H 4 -Cl-N-O 2 . Molecular weight 157.56. In case of high heat, it is flammable with an open flame. Reacts with strong oxidants. Decomposed by high heat, producing toxic nitrogen oxides and hydrogen chloride. [0003] Nitrochlorobenzene has three isomers: [0004] O-nitrochlorobenzene, O-Chloronitrobenzene; [0005] P-nitrochlorobenzene, P-Chloronitrobenzene; [0006] M-nitrochlorobenzene, M-Chloronitrobenzene. [0007] O-nit...

AI Technical Summary

Problems solved by technology

[0016] 1. The waste heat at the top of the rectification tower is not recovered, and has the following disadvantages:

[0019] 2. The residual heat of the condensed water in the reboiler of the distillation column is not recovered, and there are the following disadvantages:

[0020] 1) The condensed water in the reboiler of the rectification column is not recovered, resulting in a great waste of water resources;

[0021] 2) The condensed water of the reboiler of the rectification tower is discharged into the ditch or the sewer, which pollutes the environment and damages the underground drainage network

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