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Method for producing tert-butylamine by direct catalytic amination of isobutene

A technology of isobutylene and tert-butylamine, which is applied in the field of organic amine production, can solve the problems of high temperature in the preparation process, low reaction conversion rate, equipment corrosion, etc., and achieve the effects of long catalyst life, avoiding polymerization, and avoiding high energy consumption

Active Publication Date: 2015-03-18
王荣发
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for the production of organic amines by direct catalytic amination of isobutylene, to overcome the high temperature, high pressure, environmental pollution, equipment corrosion and low reaction conversion rate in the preparation process of the prior art Under low temperature and pressure, a stable reaction can be carried out to obtain high olefin conversion, selectivity of the target amination product and satisfactory catalyst life

Method used

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  • Method for producing tert-butylamine by direct catalytic amination of isobutene
  • Method for producing tert-butylamine by direct catalytic amination of isobutene
  • Method for producing tert-butylamine by direct catalytic amination of isobutene

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Embodiment (1～10

[0046] Catalyst of the present invention can be prepared by following method:

[0047] (1) The original powder of silica-alumina molecular sieve was mixed with 0.5mol / mL NH 4 The Cl aqueous solution is refluxed and condensed at about 80°C for ion exchange, washing, drying at 110°C, and then roasted to obtain H-type silica-alumina molecular sieve raw powder.

[0048] (2) The H-type silica-alumina molecular sieve raw powder obtained in step 1 is respectively loaded with nitrate, sulfate or carbonate of modifying elements, aged for 12 hours, dried at 110°C for 2 hours, and roasted A modified silica-alumina molecular sieve was obtained.

[0049] (3) Grafting the modified silica-alumina molecular sieve prepared in step 2 with an organic halide in a chemical bonding method.

[0050] (4) The modified silica-alumina molecular sieve prepared in step 3 and the binder boehmite or γ-Al 2 o 3 Mixing, forming, drying and roasting the formed product to obtain a modified silica-alumina mo...

Embodiment 11～13

[0058] According to the method of embodiment 6, just changing the reaction temperature is 260 ℃, 300 ℃, 320 ℃, and the results are listed in table 2.

[0059] Table 2:

[0060]

Embodiment 14～16

[0062] According to the method of embodiment 6, just changing reaction pressure is 5.0MPa, 8.0MPa, 11.0MPa, and reaction result is listed in table 3.

[0063] table 3:

[0064]

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Abstract

The invention relates to a method for producing tert-butylamine by direct catalytic amination of isobutene, which is characterized by comprising the following steps: continuously injecting an olefin raw material and ammonia into a multitubular fixed bed reactor filled with a catalyst for direct amination reaction, wherein the feed mole ratio of the olefin raw material to ammonia is 1:0.5-1:4; and performing rectification separation of the reaction products to obtain tert-butylamine with purity of 99.9%. In the process of the invention, the molecular sieve catalyst is subjected to element modification so as to realize optimal adjustment of surface acidity, thus polymerization of the olefin is prevented, and the service life and the reaction selectivity of the catalyst are improved. The molecular sieve catalyst used in the invention is modified by rare earth elements or transition metal elements and organic halides and has improved catalytic performance, a special process operation method is adopted, thus the process of the invention is carried out at a low reaction temperature and reaction pressure, the olefin conversion rate and the amide selectivity are improved when compared with the prior art, and the service life of the catalyst is prolonged.

Description

【Technical field】 [0001] The invention relates to the technical field of organic amine production, in particular to a method for producing tert-butylamine by direct catalytic amination of isobutene. 【Background technique】 [0002] Taking the most representative tert-butylamine in the synthesis of organic amines as an example, there are many synthesis methods [1] , There are mainly tert-butyl urea hydrolysis method, tert-butanol direct amination method, Ritter reaction, olefin hydrocyanic acid method, olefin-acetonitrile direct hydrolysis method. The above-mentioned process uses inorganic acid, which not only causes equipment corrosion, but also has the disadvantages of serious environmental pollution and large energy loss. The most ideal route is the synthesis of amines by 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/60C07C211/07B01J31/26B01J31/34
Inventor 王荣发
Owner 王荣发
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