Method for preparing organic amine by directly aminating low-carbon olefin

A low-carbon olefin and organic amine technology, applied in the field of organic amine preparation, can solve problems such as low reaction conversion rate, equipment corrosion, environmental pollution, etc., and achieve the effects of long catalyst life, avoiding polymerization, and avoiding high energy consumption

Inactive Publication Date: 2007-09-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved in the present invention is to provide a method for producing organic amines by direct amination of low-carbon olefins, so as to overcome the defects of high temperature, high pressure, environmental pollution, equipment corrosion, and low reaction conversion rate in the above process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment (1～10

[0036] Catalyst of the present invention can be prepared by following method:

[0037] 1. Add 10 grams of silicon-aluminum molecular sieve raw powder to 90 ml of NH with a concentration of 0.3 mol / mL 4 The Cl aqueous solution was refluxed at about 80°C for 5 hours, ion-exchanged, washed, dried at 110°C, and then calcined at 400°C for 6 hours to obtain H-type silica-alumina molecular sieve raw powder.

[0038] 2. Immerse 10 grams of the H-type silica-alumina molecular sieve raw powder prepared in step 1 in the nitrate or carbonate solution of the modifying element, after aging for 12 hours, dry at 110°C for 2 hours, and roast at 400°C After 6 hours, a modified silica-alumina molecular sieve was obtained.

[0039] 3. 7 grams of modified silica-alumina molecular sieves prepared in step 2 and 3 grams of binder γ-Al 2 o 3 Mix and grind evenly, then slowly add 5ml of 5% (wt) HNO 3 The aqueous solution is ground to a muddy state, extruded into rods, dried and calcined at 600°C fo...

Embodiment 11～13

[0044] According to the method of Example 6, using isobutylene as raw material, molecular screening from mordenite, wherein the Si / Al molar ratio is 250; changing the reaction temperature to 200°C, 220°C, 230°C, the results are listed in Table 2.

[0045] Reaction temperature (°C)

Embodiment 14～16

[0047] According to the method of embodiment 6, just change reaction to be 1.2MPa, 1.6MPa, 2.0MPa, reaction result is listed in table 3.

[0048] reaction pressure

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PUM

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Abstract

The invention discloses a method for directly amination to produce organic amine by the lower olefins including following steps: continuously feeding the lower olefins and ammonia into the reactor having the catalyzer for an amination reaction, collecting the reaction product, i.e. target organic amine. The catalyzer components and weight percentage comprises: molecular screen of 55-89%; binder of 10-44% which is selected from Al2O3; modified element of 1-10% which is selected from rare earth element, transition metal or alkaline earth metal element. The olefin percent conversion is more than 10%, and the amide selectivity is more than 99%. The inventive operation method benefits much to the catalytic properties. Compared to the current technology, the invention provides the catalyzer with a high activity, a reaction product with a good selectivity and an organic amine with a good quality.

Description

technical field [0001] The invention belongs to a method for preparing organic amines, in particular to a method for preparing organic amines by reacting with ammonia in the presence of a modified molecular sieve catalyst using light olefins as raw materials. Background technique [0002] There are many synthetic methods of organic amides, such as hydrolysis of tert-butyl urea, direct amination of tert-butanol, Ritter reaction, olefin hydrocyanic acid method and olefin-acetonitrile direct hydrolysis method. The above-mentioned technology needs to use inorganic acid, which not only causes equipment corrosion, but also has the disadvantages of serious environmental pollution and large energy loss. Therefore, the most ideal route is to synthesize amines through the direct reaction of alkenes and ammonia. [0003] R-CH=CH 2 +NH 3 →R-CH(NH 2 )-CH 3 [0004] In the early 1980s, Air Products and chemical Inc of the United States reported the use of rare earth me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/60C07C211/03B01J29/06
Inventor 金杏妹马云飞
Owner EAST CHINA UNIV OF SCI & TECH
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