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Method for recovering m-diaminotoluene from dinitrotoluene hydrogenated tar

A technology of dinitrotoluene and diaminotoluene is applied in the direction of amino compound purification/separation, organic chemistry, etc., to achieve the effects of simple process, low price and high adsorption yield

Inactive Publication Date: 2010-11-03
GANSU YINDA CHEM +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art and effectively solve the problem of development and utilization of TDI hydrogenated organic residues, the present invention provides a method for recovering m-diaminotoluene from dinitrotoluene hydrogenated tar, which has a simple and easy process method. Yes, low production cost, high recovery rate, good product quality, less by-products, high purity, which is conducive to environmental protection and resource utilization

Method used

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Examples

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Embodiment Construction

[0015] The following examples serve to further illustrate the method of the present invention. The spirit and scope of the present invention disclosed above are not limited by these examples.

[0016] Implementation column 1

[0017] Use dinitrotoluene hydrogenated tar as raw material, pour it into a beaker filled with quantitative absolute ethanol and stir, wherein the mass ratio of dinitrotoluene hydrogenated tar to absolute ethanol is 1:100, filter; use a constant flow pump to filter the filtrate Put it into a fixed bed filled with quantitative 13x molecular sieves, absorb the hydrogenated tar within a certain period of time, and discharge the liquid after the adsorption is completed; again use a constant flow pump to put a certain amount of absolute ethanol into the fixed bed for desorption , the desorption is completed, discharge the desorption liquid, and desorb twice; conduct quantitative analysis on each discharge liquid, detect the composition of the desorption liqui...

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Abstract

The invention discloses a method for recovering m-diaminotoluene from dinitrotoluene hydrogenated tar. The method adopts the dinitrotoluene hydrogenated tar as the raw material, uses molecular sieves as adsorbent and enables the dinitrotoluene hydrogenated tar and the adsorbent to contact in an adsorption condition, the adsorption temperature is 30-80 DEG C, the desorption temperature is 40-100 DEG C, the residence time is 0.5-8h, and solvent and desorption agent are organic solvent, then residual components in raw material mixture are removed, and the adsorbed m-diaminotoluene is desorbed and recovered by the desorption agent which contains low alcohol in a desorption condition.

Description

technical field [0001] The invention relates to a process for extracting chemical raw materials from chemical industry residues, in particular to a process for recovering meta-position from derivative tar produced by hydrogenating dinitrotoluene to produce meta-diaminotoluene (TDA) in the production process of TDI The method of diaminotoluene is used to solve the problem of development and utilization of TDI organic residues. Background technique [0002] With the development of the chemical industry and the rapid advancement of science and technology, the comprehensive development and utilization of chemical industry residues is becoming more and more important. In the known technology, the industrialized production process of toluene diisocyanate (TDI) is mainly divided into processes such as nitration, hydrogenation and photochemistry of toluene. The products are ortho-, para-isomers and a small amount of meta-isomers. When the ortho- and para-position nitrotoluene under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/51C07C209/86
Inventor 李贵贤李晓明张义新滕志君毛丽萍范宗良
Owner GANSU YINDA CHEM
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