NOVELTY - Forming isopropylamine involves: in fixed bed reactor, near inlet loading spherical nickel-based catalyst, and close to outlet filling strip-shaped nickel-based catalyst, where spherical nickel-based catalyst is packed in reactor bed as layer to height of 1/4 to 1/2 of reactor, reacting acetone, hydrogen and ammonia by hydrogen-based amination to form isopropylamine, at reaction temperature of 80-150 degrees C, reaction pressure of 0.7-1.6 MPa, liquid hourly space velocity of 0.1-1.2 hours, and acetone, hydrogen, and ammonia mol ratio is 1:(1-4):(1-6).    USE - For producing isopropylamine (claimed) useful for forming pesticides such as atrazine, methyl isofenphos and buprofezin, for producing detergent such as sodium dodecyl benzene sulfonate isopropylamine salt; and for use in rubber industry and in pharmaceutical industry.    ADVANTAGE - The method for producing isopropylamine avoids circulation problems associated with existing technology for forming isopropylamine by using diisopropylamine and isopropanol, reduces energy consumption, can save maneuver and avoids use of diisopropylamine distillation system, is simple and feasible, easy to implement, and has industrial applications with considerable value and economic benefits. The segmental filling of catalyst in fixed bed reactor can greatly improve selectivity of reaction, so that method is easy to realize. The method uses only one reactor, does not require diisopropylamine rectification system, thus greatly reduces investment cost and operation cost, and is convenient to operate.    DETAILED DESCRIPTION - Method for producing isopropylamine, involves: in fixed bed reactor, near inlet end loading spherical nickel-based catalyst, and close to outlet end filling strip-shaped nickel-based catalyst, where spherical nickel-based catalyst has specific surface area and pore volume of 170-220 m2/g and 0.5-0.8 ml/g respectively, and strip-shaped nickel-based catalyst has specific surface area and pore volume of 140-170 m2/g and 0.3-0.5 ml/g respectively, where spherical nickel-based catalyst is packed in fixed bed reactor bed as layer to height of 1/4 to 1/2 of reactor, in presence of two catalysts, reacting raw materials including acetone, hydrogen and ammonia by hydrogen-based amination reaction to generate isopropylamine as main reaction product, where reaction conditions include reaction temperature of 80-150 degrees C, reaction pressure of 0.7-1.6 MPa, liquid hourly space velocity of 0.1-1.2 hours, and acetone, hydrogen, and ammonia mol ratio of 1:(1-4):(1-6).