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Process for separating and utilizing mixing components of o-, m-, and p-nitrochlorobenzene

A technology of p-nitrochlorobenzene and o-nitrochlorobenzene, which is applied in the field of green and sustainable development separation and utilization engineering, can solve the problems of large investment, high cost, and secondary pollution, and achieve energy saving and consumption reduction, environmental pollution, and easy Separation and purification, the effect of high use value

Inactive Publication Date: 2008-10-22
浙江省常山长盛化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extensive management model of "pollution first, treatment later" not only accelerates the depletion of natural resources, but also requires large investment and money, treats the symptoms but not the root cause, and may even cause the danger of secondary pollution

Method used

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  • Process for separating and utilizing mixing components of o-, m-, and p-nitrochlorobenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 157.5 kg of industrial production residues of p- and o-nitrochlorobenzene in the reaction kettle, add 1.58 kg of aluminum trichloride, heat to 80 ° C, and pass 15.8 kg of chlorine gas for about 8 hours for chlorination. Return the unchlorinated monochloronitrobenzene compound for rechlorination, and the product produced by chlorination is mixed dichloronitrobenzene: 3,4-dichloronitrobenzene, 2,5-dichloronitrobenzene, 2 , 4-dichloronitrobenzene, 2,3-dichloronitrobenzene. Then according to the difference in boiling point, 2.4 kg of 2,3-dichloronitrobenzene was separated by a rectification tower, and its purity was ≥99.5% as detected by gas chromatography, with a melting point of 62°C and a yield of about 1.3%; simultaneously, 2,4-dichloronitrobenzene was obtained. The mixture of chloronitrobenzene, 2,5-dichloronitrobenzene and 3,4-dichloronitrobenzene was 45.6 kg, and the yield was about 23.8%.

Embodiment 2

[0032] Add 157.5 kg of industrial production residues of p- and o-nitrochlorobenzene into the reaction kettle, add 3.95 kg of aluminum trichloride, heat to 95 ° C, and pass 60 kg of chlorine gas for about 9 hours for chlorination. Return the unchlorinated monochloronitrobenzene compound for rechlorination, and the product produced by chlorination is mixed dichloronitrobenzene: 3,4-dichloronitrobenzene, 2,5-dichloronitrobenzene, 2 , 4-dichloronitrobenzene, 2,3-dichloronitrobenzene. Then, according to the difference in boiling point, 7.2 kg of 2,3-dichloronitrobenzene was separated by a rectifying tower, and its purity was detected by gas chromatography to be ≥99.5%, with a melting point of 62°C and a yield of about 3.8%; at the same time, 2,4-dichloronitrobenzene was obtained. The mixture of chloronitrobenzene, 2,5-dichloronitrobenzene and 3,4-dichloronitrobenzene was 129.6 kg, and the yield was about 67.5%.

Embodiment 3

[0034] Add 157.5 kg of industrial production residues of p- and o-nitrochlorobenzene into the reaction kettle, add 7.87 kg of aluminum trichloride, heat to 105 ° C, and pass 157.5 kg of chlorine gas for about 9 hours for chlorination. Return the unchlorinated monochloronitrobenzene compound for rechlorination, and the product produced by chlorination is mixed dichloronitrobenzene: 3,4-dichloronitrobenzene, 2,5-dichloronitrobenzene, 2 , 4-dichloronitrobenzene, 2,3-dichloronitrobenzene. Then, according to the difference in boiling point, 15.4 kg of 2,3-dichloronitrobenzene was separated by a rectification tower, and its purity was ≥99.5% as detected by gas chromatography, with a melting point of 62°C and a yield of about 8%; at the same time, 2,4-dichloronitrobenzene was obtained. The mixture of chloronitrobenzene, 2,5-dichloronitrobenzene and 3,4-dichloronitrobenzene was 176.6 kg, and the yield was about 92%.

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Abstract

The invention discloses a separation and utilization method for mixed component of O-Nitrochlorobenzene, meta-nitrochlorobenzene, paranitrochlorobenzene. The separation and utilization method takes the industrial production residues of the paranitrochlorobenzene, O-Nitrochlorobenzene as starting material, and the starting material is chloridized to obtain 2, 3-dichloronitrobenzene products and the mixture of 2, 4-dichloronitrobenzene, 2, 5-dichloronitrobenzene and 3, 4-dichloronitrobenzene with catalytic function of metal halides; wherein, the mixture of dichloronitrobenzene is carried out fluoro-reaction. with anhydrous potassium fluoride in DMF with the existence of phase-transfer catalyst, 2, 4-difluoronitrobenzene product and the mixture of 2-fluorine-5-chlorine nitrobenzene and 3- fluorine -4-fluoride nitrobenzene are obtained; wherein, the obtained mixture acted by the catalytic agent carries out chlorination reaction to replace nitro group; 2,4-dichlorofluorobenzene is obtained by distillation to the generated product. The technique of the invention adopts the synthetic routes which change waste into valuables, the goal of zero emission is achieved, and the method has the advantages of sustainable development, saving energy, lowering consumption and small environmental pollution.

Description

(1) Technical field [0001] The invention relates to a green and sustainable development separation and utilization engineering technology of o-, m- and p-nitrochlorobenzene mixed components, in particular to a new technology for separating and producing high-purity nitrochlorobenzene and downstream products. (2) Background technology [0002] Due to the rapid increase of the world's population and the acceleration of the industrialization process of various countries, resources and energy are decreasing day by day and are on the verge of exhaustion. A large amount of industrial and agricultural pollutants and domestic waste are discharged, which rapidly deteriorates the ecological environment in which human beings live. Mainly manifested in air pollution, acid rain disasters, global warming, ozone layer destruction, shortage and pollution of fresh water resources, marine pollution, degradation of land resources, sharp decline in forests, reduction in biodiversity, and increas...

Claims

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Application Information

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IPC IPC(8): C07C205/12C07C201/12
Inventor 徐德忠陈生荣裴文沈志良
Owner 浙江省常山长盛化工有限公司
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