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Environment-friendly preparation method of tert-butylamine

An environment-friendly, tert-butylamine technology, applied in chemical instruments and methods, condensation/addition reaction preparation of amino compounds, molecular sieve catalysts, etc., can solve problems such as equipment corrosion, serious environmental pollution, increased unit production cost, and unfavorable industrial production, etc. Achieve the effects of reduced preparation cost, high selectivity and conversion rate, and long service life

Inactive Publication Date: 2012-08-15
ZHEJIANG HUANGMA TECH
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Problems solved by technology

Among them, the first three traditional technological methods for synthesizing tert-butylamine mainly have the following disadvantages: the tert-butylurea process requires the use of a large amount of strong acid and strong alkali, which seriously corrodes the equipment and causes great environmental pollution
The modification of the catalyst in the above reaction improves the reaction conditions, but the catalyst uses a large amount of precious metals, which greatly increases the unit production cost, which is not conducive to industrial production

Method used

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Examples

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Embodiment Construction

[0013] A catalyst for the direct amination of isobutene to prepare tert-butylamine: the catalyst uses Y-type zeolite as the matrix, the pore size is 0.1-1.0nm, the silicon-aluminum ratio of the molecular sieve is 10-50, and the specific surface area is 500-850m 2 / g. Molecular sieves are first modified into H-molecular sieves, and then in order to improve the activity and life of the catalyst, we use one or more of strong alkali metals, heavy metals, and rare earth metals to modify the catalyst. The modifying element content in the catalyst is 1-9%.

[0014] The recommended preparation procedure is as follows:

[0015] Y-type zeolite and γ-Al 2 o 3 Mix and grind evenly, binder γ-Al 2 o 3 The dosage is 10-50% (wt.). Add 5% (wt.) HNO 3 The aqueous solution is ground into mud, extruded, dried and calcined to obtain a Y-type zeolite molecular sieve catalyst.

[0016] Then the above catalyst is 3-4% NH with a mass percent concentration 4 Cl aqueous exchange (NH 4 The...

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Abstract

The invention discloses an environment-friendly preparation method of tert-butylamine. Isobutylene and liquid ammonia are directly subjected to amination under the action of a catalyst to prepare the tert-butylamine. The catalyst uses a Y-type zeolite molecular sieve as the matrix, and the active component elements and modifying elements account for 10-30%. The Y-type zeolite molecular sieve is modified by the following steps: exchanging the Y-type zeolite molecular sieves with an NH4Cl aqueous solution, washing, drying in a nitrogen or argon atmosphere, and carrying out heat treatment by roasting to obtain an H-type zeolite molecular sieve; and carrying out dipping treatment on the H-type molecular sieve with metal salt, drying in a nitrogen or argon atmosphere, roasting to obtain the modified Y-type zeolite molecular sieve. The modified Y-type zeolite molecular sieve catalyst must be activated before use. The invention has the advantages of mild reaction conditions, high selectivity, high yield, environment friendliness and low catalyst modifying cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing tert-butylamine, more specifically a method for preparing tert-butylamine by amination of isobutene, which belongs to the technical field of chemical synthesis. Background technique [0002] Tert-butylamine is widely used in the synthesis of Folipine, synthetic rubber accelerator NS, pharmaceutical insecticide and dye colorant. Tert-butylamine was first produced in 1985. With the increasing market demand for tert-butylamine, dozens of synthetic methods of tert-butylamine have been developed over the years. The methods that can realize industrialization mainly include tert-butylurea method, isobutylene-HCN method, MTBE-HCN , Amination of isobutylene. Among them, the first three traditional technological methods for synthesizing tert-butylamine mainly have the following disadvantages: the tert-butylurea process requires the use of a large amount of strong acid and strong alkali, which seriously corrodes th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/03C07C209/60B01J29/14B01J29/16B01J29/08
Inventor 金一丰颜吉校金杏妹王新荣张月江宋明贵
Owner ZHEJIANG HUANGMA TECH
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