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Method for producing anisidine by mixed nitrochlorobenzene reacting in aqueous solvent

A technology of aminoanisole and nitrochlorobenzene, which is applied in chemical instruments and methods, preparation of organic compounds, and preparation of aminohydroxyl compounds, etc., which can solve the problems of increased difficulty in environmental protection, increased processing requirements, and increased production costs, etc. Problems, achieve the effect of reducing equipment investment, simplifying production process and reducing labor intensity

Inactive Publication Date: 2009-12-23
扬州铭睿达化工科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will inevitably lead to higher requirements for solvent recovery equipment, safety level, wastewater treatment, nitrochlorophenyl etherification reaction or raw material pretreatment, higher production costs, and greater difficulty in environmental protection

Method used

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  • Method for producing anisidine by mixed nitrochlorobenzene reacting in aqueous solvent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Etherification reaction: at 2M 3 Add 600kg of mixed nitrochlorobenzene (o-nitrochlorobenzene content 36.8%, p-nitrochlorobenzene content 61.6%, m-nitrochlorobenzene 1.6%) into the reaction kettle of 600kg, 120kg methanol, and 200kg sodium hydroxide. Heat to 70°C and add 700kg of water. It is heated to 120°C, the reaction pressure is controlled to 0.6 MPa, and the reaction time is maintained for 4 hours. Sampling and analysis showed that the total etherification conversion rate of o- and p-nitrochlorobenzene was 98.3%.

[0019] (2) Liquid-liquid separation: the reaction liquid in the previous step was cooled to room temperature (27°C), and the aqueous phase was separated to obtain 580 kg of etherified oil. After the impurities are filtered out of the water phase, it is recycled for secondary batching.

[0020] (3) Hydrogenation reduction: add 580kg of etherified oil obtained in the previous step, 1.5kg of Ce modified Pd-C catalyst, and 50kg of water to 1M 3 In the reacti...

Embodiment 2

[0025] (1) Etherification reaction: at 2M 3 Add mixed nitrochlorobenzene (o-nitrochlorobenzene content 44.7%, p-nitrochlorobenzene content 54.1%, m-nitrochlorobenzene 1.2%) 600kg, methanol 200kg, and sodium hydroxide 300kg into the reactor. Heat to 70°C and add 200kg of water. Heat to 80°C, control the reaction pressure to 0.2 MPa, and maintain the reaction time for 8 hours. Sampling and analysis showed that the total etherification conversion rate of o- and p-nitrochlorobenzene was 97.7%.

[0026] (2) Liquid-liquid separation: the reaction liquid in the previous step was cooled to room temperature (25°C), and the aqueous phase was separated to obtain 586 kg of etherified oil. After the impurities are filtered out of the water phase, it is recycled for secondary batching.

[0027] (3) Hydrogenation reduction: add 583kg of etherified oil obtained in the previous step, 2.0kg of La modified Pd-C catalyst, and 250kg of water to 1M 3 In the reactor, the reaction temperature is controll...

Embodiment 3

[0032] (1) Etherification reaction: at 2M 3 Add 600kg of mixed nitrochlorobenzene (65.7% of o-nitrochlorobenzene, 32.4% of p-nitrochlorobenzene, 1.9% of m-nitrochlorobenzene), 120kg of methanol, and 300kg of sodium hydroxide into the reactor. Heat to 70°C and add 500kg of water. Heat to 150°C, control the reaction pressure to 1.6 MPa, and maintain the reaction time for 4 hours. Sampling and analysis showed that the total etherification conversion rate of o- and p-nitrochlorobenzene was 99.4%.

[0033] (2) Liquid-liquid separation: the reaction liquid in the previous step was cooled to room temperature (24°C), and the aqueous phase was separated to obtain 586 kg of etherified oil. After the impurities are filtered out of the water phase, it is recycled for secondary batching.

[0034] (3) Hydrogenation reduction: add 586kg of etherified oil obtained in the previous step, 12kg of skeleton nickel catalyst, and 100kg of water to 1M 3 In the reactor, the reaction temperature is controll...

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Abstract

The invention relates to a method for producing anisidine by mixed nitrochlorobenzene (comprising o-nitrochlorobenzene, p-nitrochlorobenzene and m-nitrochlorobenzene) in an aqueous solvent through steps of etherification, hydrogenation, distillation separation, and the like. The method comprises the technical processes: (1) enabling the mixed nitrochlorobenzene and methanol to react, using water as a solvent and sodium hydroxide as a catalyst; (2) separating an aqueous phase; (3) catalyzing and hydrogenating etherified oil, and directly hydrogenating and reducing the etherified oil by using water as the solvent without washing to remove alkaline by water; (4) filtering the catalyst; (5) separating crude products, cooling and precipitating an organic phase, and separating and removing the water phrase; and (6) rectifying and separating an organic phase, and rectifying the organic phase obtained by separating water to obtain pure p-anisidine and pure o-anisidine with the purity over 99 percent. The method for producing anisidine by mixed nitrochlorobenzene reacting in an aqueous solvent has simple technology, low cost and energy consumption, high product purity, environmental protection and low toxicity.

Description

Technical field [0001] The invention relates to a process for producing aminoanisole by reacting mixed nitrochlorobenzene in a water solvent, and belongs to the technical field of chemical industry. technical background [0002] Aminoanisole (anthranil, p-aminoanisole) is an intermediate for the synthesis of dyes, fragrances and medicines. It can produce azo dyes, ice dyes, naphthol, guaiacol and vanillin, There are more than 100 kinds of fine chemicals such as artificial musks, and the domestic and foreign market demand continues to grow. Therefore, in recent years, amino anisole has developed rapidly in China. According to statistics, the global production capacity has reached 120,000 tons in 2008, while the domestic annual production capacity has reached more than 80,000 tons, which also plays a decisive role in the international arena. [0003] The traditional production process of o-anisidine or p-anisidine is based on o-nitrochlorobenzene or p-nitrochlorobenzene as raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C217/84C07C213/02
Inventor 段睿菅盘铭范以宁赵红坤菅睿琪宋桂芳
Owner 扬州铭睿达化工科技有限公司
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