Method for preparing diethyl diaminotoluene

A technology of diethyldiaminotoluene and diaminotoluene, which is applied in the field of preparation of diethyldiaminotoluene, can solve the problems of equipment corrosion environment and pollution, achieve high atom utilization, reduce equipment cost, and save raw materials Effect

Active Publication Date: 2012-07-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] It can be seen from the above reaction process that this type of reaction needs to be operated under conditions of high temperature and high pressure and strict control of moisture, causing serious corrosion of equipment and environmental pollution.

Method used

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  • Method for preparing diethyl diaminotoluene
  • Method for preparing diethyl diaminotoluene
  • Method for preparing diethyl diaminotoluene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 10.0g of 2,4-diaminotoluene and 48mL of ethanol into a 100mL stainless steel batch reactor, stir and dissolve, add 1.0g of nano-scale HZSM-5 molecular sieve, heat to 330°C, react for 5h, take out the product at 1500 After centrifuging for 2 min at a speed of rpm, the upper layer liquid was taken for chromatographic analysis, and the results are shown in Table 1 (A).

Embodiment 2

[0044] The reaction steps are the same as in Example 1, but the reaction time is changed to 10h, and the product is subjected to chromatographic analysis, and the results are shown in Table 1 (B).

Embodiment 3

[0046] Add 10.0g of 2,4-diaminotoluene and 48mL of ethanol into a 100mL stainless steel batch reactor, stir and dissolve, add 1.0g of mordenite (HM), heat to 330°C, react for 5h, take out the product at 1500 rpm Centrifuge at a speed of 2 min for 2 min, and take the upper liquid for chromatographic analysis, the results are shown in Table 1 (C).

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Abstract

The invention relates to a method for preparing diethyl diaminotoluene. 2, 4- diaminotoluene is in ethylization reaction with ethylizing agent under catalysis of an acidic zeolite molecular sieve to prepare the diethyl diaminotoluene, wherein the ethylizing agent is selected from ethylene and ethanol. The preparation method is completed by one step, simple in process procedure and convenient in operation. The solid acidic catalyst is incorrosive to equipment and easy to be separated from reaction product after reaction is completed, and the method is applicable to continuously operated reactors such as fixed beds and the like and has industrial application prospect. Controlling anhydrous conditions during reaction is not needed, so that reaction conditions are convenient to control and cost of reaction equipment is reduced. By-products such as ethyl products, TDA (tolylenediamine), ethylene or ethanol can be recycled, and accordingly raw materials are effectively saved. Moreover, the method is environment-friendly, high in atom utilization rate, barely free of discharge of waste liquid and waste residue and free of coupled products, thereby being the development orientation of future industrial production.

Description

technical field [0001] The invention relates to a preparation method of diethyldiaminotoluene. Background technique [0002] Diethyldiaminotoluene (DETDA) is an important fine chemical product, and its commodity usually contains 76% of 3,5-diethyl-2,4-diaminotoluene and 24% of 3,5-diethyl Base-2,6-diaminotoluene, its structural formula is as follows: [0003] [0004] It is a light yellow to amber transparent liquid at room temperature. It becomes darker when exposed to air. It has a boiling point of 308°C and a pour point of -9°C. It is slightly soluble in water and soluble in polar organic solvents such as alcohols, ethers, and ketones. DETDA is an aromatic diamine curing agent for polyurethane elastomers and epoxy resins. It is mainly used for casting, coatings and adhesives. It is also a chain extender for polyurethane and polyurea elastomers. At present, the synthesis of DETDA usually adopts diaminotoluene and ethylene as raw materials, and uses Lewis acid (anhydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/51C07C209/68
Inventor 左轶郭新闻刘民
Owner DALIAN UNIV OF TECH
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