Direct isobutene aminating process to prepare tert-butyl amine

A technology of tert-butylamine and isobutylene, which is applied in the directions of organic chemistry, amino-substituted hydrogen atom preparation, etc., can solve the problem of high catalyst manufacturing cost, and achieve the effects of low manufacturing cost and improved selectivity.

Inactive Publication Date: 2003-08-20
SINOPEC SHANGHAI PETROCHEMICAL CO LTD +1
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Problems solved by technology

However, its disadvantage is that the catalyst uses noble metals as raw mat

Method used

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Embodiment 1

[0014] The present invention will be further described by some examples below, and in the examples, the conversion rate of isobutylene and the selectivity of tert-butylamine are defined as: [embodiment 1~10] preparation of catalyst:

[0015] Take the original powder of silicon-aluminum molecular sieve (the silicon-aluminum ratio is 50-100, the specific surface is 300-500m 2 / g, pore volume is 0.2~0.3mL / g) and binder γ-Al 2 o 3 Mix and grind evenly, binder γ-Al 2 o 3 The dosage is 10-40% (wt.). Add 5% (wt.) HNO 3 The aqueous solution is grinded to a muddy state, extruded into rods, dried and calcined at 400-600°C for 3-6 hours to obtain a silica-alumina molecular sieve catalyst.

[0016] Then the above-mentioned silica-alumina molecular sieve catalyst was treated with NH 4 Exchange and wash with aqueous Cl solution until Cl is no longer detectable with silver nitrate solution - In the presence of ions, heat treatment is carried out by air drying and roasting to obtai...

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Abstract

In the direct isobutene aminating process, isobutylene and ammonia are directly reacted to prepare tert-butyl amine in the presence of catalyst the reaction temperature of 150-280 deg.c, normal temperature or reaction pressure of 0.05-0.5 MPa, isobutylene and ammonia feeding molar ratio of 0.5-2 and isobutylene space velocity of 260-409 /hr(-1). The catalyst has aluminosilicate molecular sieve as mother body with Si/Al ratio of 30-300, specific surface area of 100-800 sq m/g and pore volume of 0.1-0.4 mg/g, and the molecular sieve is first denatured into H-molecular sieve and then denatured with one or more denaturing elements Ce, La and Ga in the weight content of 1-10 wt%. The present invention adopts catalyst with relatively low cost, and the direct aminating is in relatively low temperature or the favorable thermodynamic temperature range.

Description

technical field [0001] The invention belongs to a method for preparing amines by amination of olefins. The catalyst used uses silicon-aluminum molecular sieves as a matrix and is modified by exchange of rare earth elements. Background technique [0002] Tert-butylamine is a widely used organic chemical raw material, which can be used in the manufacture of medicines, pesticides, rubber accelerators, dyes and colorants, etc. The industrial synthesis routes of tert-butylamine mainly include tert-butylurea hydrolysis method, N-tert-butylamide hydrolysis method, tert-butanol direct amination method and isobutene direct amination method, among which the isobutene direct amination method is the most economical and efficient. [0003] In the prior art, the early direct amination method of isobutene to prepare tert-butylamine requires a reaction pressure as high as nearly 30 MPa, which has high requirements on equipment and consumes a lot of power. Along with the continuous improvem...

Claims

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Application Information

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IPC IPC(8): C07C209/02C07C211/03
Inventor 金杏妹郭世卓黄佩玲
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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