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CAS号 [6313-37-7] 生产工艺 2,5-二甲氧基-4-硝基苯胺

CAS [6313-37-7] 生产工艺  2,5-二甲氧基-4-硝基苯胺

CAS: Benzenamine, 2,5-dimethoxy-4-nitro- 历史参考文献: Beil. 13. E3, 2158. : 由此可査到前面的页号)

用途: 冰染重氮组分40,有机合成等。反应类别: 苯甲酰氨基水解。

生产工艺参考文献: 按本人手头资料整理如下:

BIOS 1149, 44-45.=胶卷 PB 803764-Nitro-2,5-dimethoxyaniline Leverkusen英国人译自德文。抄录如下。

反应式: 本人有加注,译者未说明资料来源,本人暂未找到德文原件。
 

Outline: 化学过程=反应过程;  德文是Hergang:

4’-Nitro-2’,5’-dimethxybenzanilide is hydrolysis with alcoholic caustic.

Materials:

4’-Nitro-2’,5’-dimethoxybenzanilide MW 302 ≌ 80 kg. NaNO2 = 622 kg.(100/ 12.9)(97% Nitro value)

Alcohol  1000 kg.  Caustic liquor  40 vol-%  130 l.

Plant:

  1 Iron pan (4000 l.)with jacket for steam and water connection, propeller agitator.  20 r.p.m.

1 Nutsche. 1 Iron blow-egg. 1 Alcohol recovery apparatus. 抄注: 这里比[134-19-0]的英文好一些。

Process:

The alcoholic hydrolysis vessel is charged with 622 kg of 4’-nitro-2’,5’-dimethoxybenzanilide (100/12.9 = 80 kg NaNO2) and 1000 kg. of alcohol (90-94%) are then run in. It is heated to 500, 130 l. of caustic liquor (= 52 kg NaOH) run in, heated to 68-700, and held at this temperature for 1 hour. As hydrolysis occurs, the deep-yellow, small, crystalline benzoyl-compound changes into large brownish-yellow crystals.

It is cooled to 250 and blown to a nutsche where it is washed with diluted alcohol, then with water, finally hydro-extracted and dried at 650C.

Yield = 203 kg dry product (100 kg = 35.47 NaNO2) = 72 kg NaNO2 = 90.0% theory.

Quality: The nitro-content (titranous) must be 99-100% of the nitrite value.

The alcohol is recovered in the distillation unit (90% recovery). 

张澍声 编译。《精细化工中间体工业生产技术》 1996年。P. 23. 4-硝基-2,5-二甲氧基苯胺(译自BIOS 1149 抄录如下。

在4000 L铁锅中加入622 kg 4’-硝基-2’,5’-二甲氧基苯甲酰苯胺(相当于80 kg NaNO2),然后流入1000 kg 90-94% 乙醇,加热到500C,流入130 L 40% NaOH溶液。加热到68-700C, 在此温度保持1小时。水解发生后,苯甲酰化合物的深黄小结晶转变为大的棕黄色结晶。

冷却到250C,抽滤,用稀乙醇洗涤,然后水洗,用水压机压干后在650C干燥。

得到203 kg 干的4-硝基-2,5-二甲氧基苯胺,相当于72 kg NaNO2. 收率90%

乙醇蒸馏回收,回收率90%。

加注:  暂未找到德文原件,不好评述。 

陈忠源  2017年7月25日             于 无锡   明辉国际。



文章作者:陈忠源