Nitrobenzene washing and separating system

A separation system and nitrobenzene technology, applied in the preparation of organic compounds, organic chemistry, chemical instruments and methods, etc., can solve the problems of inoperability, small operation flexibility, high energy consumption, etc., to improve safety, not easy to leak, The effect of low energy consumption

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production method has a large number of equipment, high investment, large floor area, high energy consumption, complicated operation and control, and difficult to guarantee the washing effect.
[0004] The second is multi-injector series jet washing. Jet washing has good deacidification and phenol removal effects, but the operation flexibility is small, and it cannot be operated within a wide output range. In addition, jet washing relies on high-speed flowing water and alkaline water. To pump crude nitrobenzene, so the water consumption is large, the energy consumption is high, and a separator must be installed after each stage of spraying; in addition, spray washing is easy to emulsify water and washings
Compared with the kettle-type series washing, the tubular scrubber is a static device, which saves energy and water consumption. The main problem is that the mixing effect of the static mixer is not ideal, resulting in the content of sodium salt and phenate in crude nitrobenzene. too high

Method used

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  • Nitrobenzene washing and separating system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, the volume ratio of nitrobenzene and alkaline water entering the neutralization scrubber is 10:1, and the volume ratio of nitrobenzene and water entering the washing scrubber is 2:1.

[0025] After Example 1, the indicators before and after nitrobenzene enters the coalescence separator are shown in Table 1 below:

[0026] Table 1 Indicators before and after nitrobenzene enters the coalescence separator in Example 1

[0027] before washing after washing Moisture, ppm 3183 1909 Na + , ppm (in Na + count) 5.0 1.5 Phenol content, ppm (as 2,4-dinitrophenol) 2.3 1.0

Embodiment 2

[0028] Embodiment 2, the device structure is roughly the same as that of Example 1, the difference is that the coalescence separator adopts plate packing, the volume ratio of the nitrobenzene and alkaline water entering the neutralization scrubber is 15:1, and the nitrobenzene entering the washing scrubber is 15:1. The volume ratio of benzene to water is 2.5:1.

[0029] After Example 2, the indicators before and after nitrobenzene enters the coalescence separator are shown in Table 2 below:

[0030] Table 2 Indicators before and after nitrobenzene enters the coalescence separator in Example 2

[0031] before washing after washing Moisture, ppm 3546 2136 Na + , ppm (in Na + count) 4.8 1.6 Phenol content, ppm (as 2,4-dinitrophenol) 3.6 1.2

Embodiment 3

[0032] Embodiment 3, the structure of the device is roughly the same as that of Embodiment 1, the difference is that the coalescing separator adopts a plate type and a fiber filter core combined filler, and the volume ratio of nitrobenzene and alkaline water entering the neutralization scrubber is 20:1, and the water is washed and washed The volume ratio of nitrobenzene to water is 3:1.

[0033] After Example 3, the indicators before and after nitrobenzene enters the coalescence separator are shown in Table 3 below:

[0034] Table 3 Indicators before and after nitrobenzene enters the coalescence separator in Example 3

[0035] before washing after washing Moisture, ppm 3782 2208 Na + , ppm (in Na + count) 4.2 1.3 Phenol content, ppm (as 2,4-dinitrophenol) 4.1 1.4

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Abstract

The invention belongs to the technical field of chemical washing and separating equipment, and relates to a nitrobenzene washing and separating system. After nitration reaction, nitration products and waste acids enter into a nitration separator to separate, separated organic phases enter into a neutralizing washer and a water-washing washer for alkaline washing and water washing, and obtained organic phases enter into a coalescing separator to further remove sodium salt and phenoxide in the organic phases, and subsequence treatment is carried out. The coalescing separator is mainly a static separator such as a fiber filter element separator, a plate separator or a combined separator. According to the method provided by the invention, nitrobenzene is washed and separated, so that sodium salt and phenoxide in coarse nitrobenzene can be further removed. The nitrobenzene is fully washed, and the content of phenoxide in washed coarse nitrobenzene is lower, so that the safety of the production system is improved.

Description

technical field [0001] The invention relates to a washing and separating system in the production of chemical products, in particular to a production device for deacidification, dephenolation and sodium salt removal of crude nitrobenzene in the production process of nitrobenzene by nitration of benzene. Background technique [0002] The crude nitrobenzene produced by benzene under the action of mixed acid contains residual acid and nitrophenol by-products that will bring danger to subsequent production. The nitrobenzene washing process is to use a certain concentration of lye to neutralize the residual liquid in the crude nitrobenzene and make the nitrophenols react with the alkali to form phenoxide. The phenate is easily soluble in water, and then washed with water to achieve the purpose of deacidification and dephenolization. The above-mentioned production process is customarily called the nitrobenzene washing process. After washing, the organic phase and the inorganic ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/06C07C201/16
Inventor 丁红霞李玉杰谭彦衍季峰崎孙盛凯金汉强
Owner CHINA PETROLEUM & CHEM CORP
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