Method of synthesizing monoisopropanolamine

Abstract

The invention relates to a synthesis method of isopropanolamine. The synthesis method comprises the following steps: (1) liquid ammonia and water are mixed to form ammonia water which is mixed with propylene oxide; mixed solution is preheated until the temperature reaches 120 to 125 DEG C, and the inputting molar ratio of the ammonia and the propylene oxide is controlled within 10 to 15; (2) the materiel after preheating is delivered into a reactor, the reaction temperature ranges from 128 to 138 DEG C, the pressure ranges from 12.6 to 13.8MPa, and the reaction time ranges from 1.5 to 3 hours; (3) the surplus unreacted ammonia is separated from the obtained mixture after the reaction by using a flash distillation column, the pressure in the flash distillation column ranges from 0.6 to 1.6MPa, and the temperature of a column kettle ranges from 140 to 160 DEG C; (4) the mixture which is separated through the flash distillation column is delivered into a leading tower for rectification dehydration, the pressure in the leading tower ranges from minus 0.080 to minus 0.085MPa, the temperature at the top of the leading tower is 45 to 55 DEG C, and the temperature at the bottom in a towerkettle ranges from 110 to 130 DEG C; (5) the mixture after dehydration is delivered into a rectification column for rectification, the pressure in the rectification column ranges from minus 0.095 to minus 0.099MPa, the temperature in the column kettle ranges from 135 to 160 DEG C, the temperature at the top of the rectification column ranges from 60 to 70 DEG C, isopropanolamine products are obtained at the top of the rectification column, and the mixture composed of diisopropanolamine and triisopropanolamine is obtained in the column kettle. The synthesis method has simple production procedure, little equipment investment, and high product quality.

Description

technical field

[0001] The present invention relates to a kind of synthetic method of monoisopropanolamine. technical background

[0002] One isopropanolamine is 1-amino-2-propanol (chemical formula: CH 3 CH(OH)CH 2 NH 2 ), also known as monoisopropanolamine. Monoisopropanolamine has a wide range of uses: it can be used in daily chemicals such as detergents, liquid detergents, and shampoos; it can be used in fabrics, wool spinning, and leather auxiliaries; it can be used in cleaning agents for metal electronic liquid crystals and semiconductors; It can be used in the synthesis of medicines, pesticides and flavors and fragrances intermediates.

[0003] Most of the industrial production methods of isopropanolamine are now using ammonia water or liquid ammonia and propylene oxide as raw materials to synthesize isopropanolamine series mixtures, and then gradually separate monoisopropanolamine, diisopropanolamine, and triisopropanolamine. Three products of isopropanolamine. ...