A kind of method that acetone hydrogenation ammonification synthesizes isopropylamine
A technology for isopropylamine and chemical synthesis, which is used in the purification/separation of amino compounds, organic chemistry, reductive alkylation preparation, etc., can solve the problems of high difficulty, reduced acetone processing capacity, and high energy consumption, and achieves the effect of less side reactions
Active Publication Date: 2018-03-27
ANHUI HAOYUAN CHEM IND GRP
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Problems solved by technology
The method commonly used in industrial production is to circulate isopropanol and diisopropylamine back to the reactor to continue the reaction to generate isopropylamine. With the increase of the circulation volume, it will inevitably compete with acetone for a part of the catalyst active sites, resulting in a reduction in acetone processing capacity; diisopropylamine Though the generation of diisopropylamine can be suppressed by circulating back in the reactor, the speed that diisopropylamine reacts to generate isopropylamine is very slow, and along with the increase of circulation amount, easily causes the accumulation of diisopropylamine in the reactor
In order to control the concentration of diisopropylamine, the method commonly used in industrial production is to regularly separate diisopropylamine, which has the problems of great difficulty and high energy consumption
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[0029] The present invention will be further described below in conjunction with accompanying drawing.
[0030] like figure 1 As shown, before the reaction is fed, the air in the isothermal reactor 8 is first replaced with nitrogen, and then the preheated hydrogen is continuously passed into the reactor 8, so that the temperature of the catalyst in the reactor 8 is raised to 130 ° C, and the reactor is 8 liters Pressure to 0.85MPa, when the catalyst temperature and the pressure in the tower rise to the reaction temperature and pressure, the hydrogen circulation is stopped.
[0031] The acetone in the acetone tank 1 is pumped into the acetone preheater 3 through the metering pump 2, and the flow rate of acetone is accurately measured by the flow meter 18. The acetone enters the preheater 3 after being preheated to 100°C with hot water from the hot water tank 13. vaporizer6.
[0032] The hydrogen in the circulating gas buffer tank 4 is accurately metered into the mixed gas pre...
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The invention discloses a method used for synthesizing isopropylamine via acetone hydrogenation ammoniation. The method comprises following steps: before reaction feeding, nitrogen is used for replacing air in a reactor, preheated hydrogen gas is delivered into the reactor continuously until catalyst temperature in the reactor is increased to 90 to 180 DEG C, and pressure in the reactor is increased to 0.2 to 1.8MPa; a preheated mixture of acetone, hydrogen gas, and ammonia is delivered into the reactor, and is subjected to hydrogenation ammoniation in the presence of a catalyst under 0.2 to 1.8MPa at 90 to 180 DEG C so as to obtain a crude product; and the crude product is cooled, and is delivered through a gas-liquid separator so as to obtain a gas product and a liquid product, wherein the liquid product is crude isopropylamine. The isopropylamine content in the crude isopropylamine is high, acetone conversion rate is 100%, and isopropylamine selectivity is 99.7% or higher.
Description
1. Technical field [0001] The present invention relates to a kind of synthetic method of known compound, specifically a kind of method for synthesizing isopropylamine by hydrogenation amination of acetone. 2. Background technology [0002] Isopropylamine, also known as monoisopropylamine, has the molecular formula C 3 h 9 N, a colorless, volatile liquid with an ammonia odor, miscible with water, ethanol and ether. Isopropylamine is an important fine chemical intermediate, which belongs to low-carbon aliphatic amine (C2~C8) products, and can be used in the production of pesticides (such as herbicides atrazine, promethazine, glyphosate isopropylamine salt, beda pine), pharmaceuticals (such as Ganle, propranolol, indoleol, chlorphenidate, etc.), dye intermediates, rubber accelerators, hard water treatment agents and detergents, and are also used in the manufacture of surfactants, textile auxiliaries, additives Solvents, detergents, depilatory agents, etc. [0003] At presen...
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IPC IPC(8): C07C209/82C07C209/26C07C211/06
CPCC07C209/26C07C209/82C07C211/06
Inventor 凡殿才王卫峰张海生吴珍汉张浩欧阳百合
Owner ANHUI HAOYUAN CHEM IND GRP