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Method for synthesizing 1,2-propane diamine

A synthetic method and technology of propylenediamine, applied in the field 1, can solve the problems of organic chlorine compounds polluting the environment, waste of resources, etc., and achieve the effects of reducing emissions and saving costs

Inactive Publication Date: 2014-03-26
QINGDAO WINCHANCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1,2-dichloropropane waste liquid is a by-product in the production process of epichlorohydrin and propylene oxide, which is about tens of thousands of tons per year; if it is not fully utilized, it will not only cause waste of resources, but also organochlorine compounds will seriously pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Add solvent water, 1,2-dichloropropane and 2% catalyst Cu to the autoclave 2 O and CuO, Cu 2 The ratio of O and CuO was 1:1, and the autoclave was closed;

[0016] (2) According to the ratio of 1,2-dichloropropane:ammonia 1:41, feed liquid ammonia into the kettle;

[0017] (3) Rapidly raise the temperature to 165°C, keep the temperature for 260 minutes, and cool down to room temperature; slowly discharge excess ammonia gas for more than 10 hours for recycling.

[0018] Under the reaction conditions of Example 1, the yield of 1,2-propylenediamine was 53%, and simultaneously, polypropylene polyamine could be co-produced with a yield of 48%.

Embodiment 2

[0020] (1) Add solvent water, 1,2-dichloropropane and 4% catalyst CuO to the autoclave, and close the autoclave;

[0021] (2) According to the ratio of 1,2-dichloropropane:ammonia 1:45, feed liquid ammonia into the kettle;

[0022] (3) Rapidly raise the temperature to 170°C, keep the temperature for 280 minutes, and cool to room temperature; slowly discharge excess ammonia gas for recycling over 10 hours.

[0023] Under the reaction conditions of Example 2, the yield of 1,2-propylenediamine was 55%, and simultaneously, polypropylene polyamine could be co-produced with a yield of 49%.

Embodiment 3

[0025] (1) Add solvent water, 1,2-dichloropropane and 5% catalyst Cu to the autoclave 2 O and CuO, Cu 2 O:CuO is 1:2, close the autoclave;

[0026] (2) According to the molar ratio of 1,2-dichloropropane:ammonia 1:50, feed liquid ammonia into the kettle;

[0027] (3) Rapidly raise the temperature to 175°C, keep the temperature for 290 minutes, and cool to room temperature; slowly discharge excess ammonia gas for more than 10 hours for recycling.

[0028] Under this reaction condition, the yield of 1,2-propanediamine is 56%, and polypropylene polyamine can be co-produced at the same time, with a yield of 48%.

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PUM

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Abstract

The invention discloses a method for synthesizing 1,2-propane diamine. The method takes 1,2-propylene dichloride as a raw material and specifically comprises the following steps: (1) feeding a catalyst, a solvent water and 1,2-propylene dichloride into a high-pressure reaction kettle, and closing the high-pressure kettle; (2) introducing liquid ammonia into the reaction kettle; and (3) rapidly raising the temperature to be 160-180 DEG C, keeping the temperature to react for 250-300 minutes, cooling to be the room temperature, and slowly discharging redundant ammonia gas to be recycled within longer than 10 hours. The method is economic and environment-friendly, the utilization rate of 1,2-propylene dichloride is improved, the yield of the 1,2-propane diamine is improved, the cost is saved, and the emission of pollutant is reduced.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a synthesis method of 1,2-propanediamine. Background technique [0002] 1,2-Propylenediamine is an important fine chemical intermediate, which is widely used in organic synthesis, medicine, dyes, pesticides, chemical additives, rubber plastic additives, and epoxy resin curing agents. [0003] 1,2-dichloropropane waste liquid is a by-product in the production process of epichlorohydrin and propylene oxide, which is about tens of thousands of tons per year; if it is not fully utilized, it will not only cause waste of resources, but also organochlorine compounds will seriously pollute the environment . Contents of the invention [0004] In order to improve the utilization rate of 1,2-dichloropropane waste liquid, the technical problem to be solved in the present invention is to provide a kind of industrial waste liquid of 1,2-dichloropropane as raw material to produce...

Claims

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Application Information

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IPC IPC(8): C07C211/11C07C209/08
Inventor 苏建丽
Owner QINGDAO WINCHANCE TECH
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