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Method for by-producing steam in ortho-nitrotoluene separation process

A technology for the separation process of o-nitrotoluene, which is applied in the field of by-product steam in the separation process of o-nitrotoluene, which can solve the problems of unfavorable environmental protection and easy emission of irritating odor, and achieve pollution reduction, cost reduction, and simple process Effect

Inactive Publication Date: 2015-03-25
QINGDAO UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the temperature of the product is high, and it is easy to emit a pungent smell, which is not conducive to environmental protection.

Method used

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  • Method for by-producing steam in ortho-nitrotoluene separation process

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Embodiment 1

[0022] as attached figure 1 As shown, the device used in the inventive method comprises an ortho rectification tower 1; condenser 2; recooler 3; soft water preheater 4; steam drum 5; vacuum buffer tank 6; product storage tank 7; Return pump 9; steam pipe network 10; vacuum gas collection system 11.

[0023] The material after the separation of para-nitrotoluene mainly contains o-nitrotoluene and m-nitrotoluene, with a flow rate of 2000kg / h and a temperature of 125°C, it enters the ortho-position rectification tower 1 for rectification, and after rectification, the ortho-nitrotoluene The gas phase of the toluene product enters the condenser 2 from the top of the rectifying tower 1, and is used as a heat medium to cool down and condense. The uncooled product gas phase enters the recooler 3 for further cooling, and the cooled product is condensed together with the condenser 2 The product that comes down enters the reflux tank 8; the uncondensed trace gas phase in the recooler 3 ...

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Abstract

The invention relates to a method for by-producing steam in the ortho-nitrotoluene separation process. The method comprises the steps of feeding a material into an adjacent rectifying column for rectifying; enabling the product vapor phase to flow from the top of the adjacent rectifying column into a condenser to be condensed; transferring the non-condensed product vapor phase into a sub-cooler for cooling; feeding the cooled product and the product condensed by the condenser into a reflowing tank; enabling the non-condensed trace vapor phase to flow from the sub-cooler into a vacuum collecting system through a vacuum buffering tank to be discharged; transferring part of the material from the reflowing tank into the adjacent rectifying column through a reflowing pump for reflowing, and processing the rest part of the material by cooling and then feeding into a product storage tank, wherein the product before being fed into the product storage tank is cooled through a soft water preheater, the soft water is preheated at the same time, then the preheated soft water enters a steam drum, saturated water in the steam drum enters the condenser to be used as a refrigerant medium, and the produced saturated steam is returned to the steam drum and then enters a steam pipe network after gas-liquid separation. The method is simple in process, the latent heat produced by cooling the product can be effectively utilized to produce steam, and therefore, the cost is decreased, the energy is saved, and the environment is protected.

Description

Technical field: [0001] The invention belongs to the technical field of nitrotoluene production, and relates to a process for the separation of nitrotoluene, in particular to a method for by-producing steam in the separation process of o-nitrotoluene. Background technique: [0002] O-Nitrotoluene (O-NT) is a yellow liquid, a mononitro product, and an important chemical intermediate. It has a very wide range of uses in industry, agriculture, medicine and health, etc. O-NT NT can be used to synthesize isocyanate and trimethyltoluene (TNT); it can also be reduced and hydrogenated to produce o-toluidine, which is an important intermediate of pesticides; it can also be oxidized to produce o-toluidine O-nitroformaldehyde and o-nitroformaldehyde are important intermediates in the synthesis of drugs. [0003] The existing nitrobenzene production process mainly includes three processes of nitration separation, washing separation and rectification separation. Toluene, nitric acid, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C201/16C07C205/06F22B1/18F22D1/00
CPCY02P20/10
Inventor 程华农颜凯谭心舜徐裕彬岳金彩唐开鑫李玉刚郑世清
Owner QINGDAO UNIV OF SCI & TECH
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