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A kind of method that phase-transfer catalysis prepares 1,2 propanediamine

A technology of phase transfer catalysis and phase transfer catalyst, applied in the field of chemical technology synthesis, can solve the problems of insufficient contact of reactants, low reaction yield, etc., and achieve the effects of reducing production cost, simple operation and reducing investment.

Inactive Publication Date: 2017-06-16
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the reaction yield is not high due to too many side reactions caused by insufficient contact of the reactants during the reaction.

Method used

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  • A kind of method that phase-transfer catalysis prepares 1,2 propanediamine

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Effect test

Embodiment 1

[0035] Add 5 mL of 1,2-dichloropropane, 0.5 g of CuO, 100 mL of ammonia water, and 1% tetramethylammonium chloride into the reaction kettle. The reaction kettle was put into a homogeneous reactor and rotated at a constant speed, and the temperature was raised to 160° C. for 3 hours. Cool down to room temperature, remove unreacted ammonia gas, and detect by gas chromatography, the yield of 1,2-propanediamine is 67.16%.

Embodiment 2

[0037] Add 5 mL of 1,2-dichloropropane, 0.5 g of CuO, 100 mL of ammonia water, and 10% tetramethylammonium chloride into the reaction kettle. The reaction kettle was put into a homogeneous reactor and rotated at a constant speed, and the temperature was raised to 160° C. for 3 hours. Cool down to room temperature, remove unreacted ammonia gas, and detect by gas chromatography, the yield of 1,2-propanediamine is 64.61%.

Embodiment 3

[0039] Add 5 mL of 1,2-dichloropropane, 0.5 g of CuO, 100 mL of ammonia water, and 1% cetyltrimethylammonium bromide into the reaction kettle. The reaction kettle was put into a homogeneous reactor and rotated at a constant speed, and the temperature was raised to 160° C. for 3 hours. Cool down to room temperature, remove unreacted ammonia gas, and detect by gas chromatography, the yield of 1,2-propanediamine is 65.70%.

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Abstract

The invention introduces preparation of 1,2-propane diamine, and mainly emphasizes an application of a phase-transfer catalyst to reactions. A major reaction process comprises the following steps: (1) adding propylene dichloride, ammonia water, a catalyst and the phase-transfer catalyst into a reaction kettle; (2) putting the reaction kettle into which raw materials are added into a homogeneous phase reactor; (3) reacting at 140-170 DEG C and 25 Hz, evaporating unreacted ammonia gas under the normal pressure after the reaction is finished, and distilling to obtain an aqueous solution of propane diamine. The method disclosed by the invention has the advantages that the propylene dichloride being a byproduct produced in the production of epoxy chloropropane is taken as a raw material, i.e.,, waste is utilized, and thus the production cost is reduced; the phase-transfer catalyst is added in a reaction process, so that the reaction yield is greatly increased; meanwhile, the method is simple, is easy to operate, and is easy for realizing industrial production.

Description

[0001] Technical field: [0002] The invention relates to a method for preparing 1,2-propanediamine by phase transfer catalysis, which belongs to the field of chemical technology synthesis. [0003] technical background: [0004] 1,2-Propylenediamine is an important organic chemical intermediate and has important applications in organic synthesis. It can also be used as an oil deactivator, elastic fiber chain extender, and epoxy resin curing accelerator. The main applications are: [0005] 1. In organic synthesis, it can be used as a raw material for synthesizing 2,3,5-trimethylpiperazine, dexrazoxane, and tobacco; [0006] 2. Due to its good oil solubility, it can be used as an oil passivator; [0007] 3. It can be used to produce epoxy resin curing accelerator; [0008] 4. It can be used as a chain extender to produce spandex; [0009] 5. It can be used to modify shellac paint to improve its heat resistance and corrosion resistance; [0010] 6. Propylenediamine can also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/11C07C209/08
Inventor 孙国新牟晓磊崔玉聂永
Owner UNIV OF JINAN
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