Method for continuously purifying and refining ortho toludiamine

A technology of o-toluene diamine and storage tank is applied in the field of continuous purification and purification of o-toluene diamine, which can solve the problems of high impurity content and affecting the quality of tolyltriazole.

Active Publication Date: 2012-10-31
NANTONG BOTAO CHEM
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  • Abstract
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  • Application Information

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Problems solved by technology

If these impurities are not removed, and the commercially available raw materials are directly reacted with sodium nitrite to prepare tolyltriazole, these impurities will also react with sodium nitrite to generate a very dark by-product, which will directly affect the production of tolyltriazole. Quality of triazole, resulting in high levels of impurities

Method used

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  • Method for continuously purifying and refining ortho toludiamine

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Embodiment 1

[0016] Embodiment 1: tower control process condition:

[0017] .

[0018] It can be obtained from the above table: under the above process conditions, after two towers are connected in series for rectification, the product rectification tower o-xylylenediamine is discharged from the top of the tower, and its content is ≥ 99.5%, m-toluenediamine ≤ 0.35%, Toluidine≤0.05%, H 2 O≤0.1%.

Embodiment 2

[0019] Embodiment 2: tower control process condition:

[0020] .

[0021] It can be obtained from the above table: under the above process conditions, after two towers are connected in series for rectification, the product rectification tower o-xylylenediamine is discharged from the top of the tower, and its content is ≥ 99.65%, m-toluenediamine ≤ 0.26%, Toluidine≤0.04%, H 2 O≤0.05%.

Embodiment 3

[0022] Embodiment 3: tower control process condition:

[0023] .

[0024] It can be obtained from the above table: under the above process conditions, after two towers are connected in series for rectification, the product rectification tower o-xylylenediamine is discharged from the top of the tower, and its content is ≥ 99.6%, m-toluenediamine ≤ 0.34%, Toluidine≤0.06%, H 2 O≤0.1%.

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Abstract

The invention relates to method for continuously purifying and refining ortho toludiamine. The method comprises the steps of: carrying out rectification by two towers connected in series, removing a front fraction of an ortho toludiamine crude product through a light component removing tower, and rectifying and separating out ortho toludiamine and meta-toluenediamine through a product tower. The method has the advantages that rectification is carried out by the two towers connected in series; and the ortho toludiamine, the meta-toluenediamine, monamine and other impurities can be continuously separated, and the purity of the ortho toludiamine can be up to over 99.5%.

Description

technical field [0001] The invention relates to a method for continuously purifying o-toluenediamine. Background technique [0002] O-toluenediamine, also known as methyl o-phenylenediamine, is a light gray solid at room temperature with an amine smell. It is an intermediate in the production of tolyltriazole, which is widely used. Tolyltriazole can be used as metal rust and corrosion inhibitors, copper and silver anti-tarnish agents, paint additives, etc. [0003] The purity of commercially available o-toluenediamine raw materials is generally 70-90% by weight, which contains a small amount of m-toluenediamine, monoamine and other impurities. If these impurities are not removed, and the commercially available raw materials are directly reacted with sodium nitrite to prepare tolyltriazole, these impurities will also react with sodium nitrite to generate a very dark by-product, which will directly affect the production of tolyltriazole. The quality of triazole, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/51C07C209/86
CPCC07C209/86C07C211/50
Inventor 黄海波黄奎生王宏黄雪平
Owner NANTONG BOTAO CHEM
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