Preparation method of diethylene monoisopropanolamine

Abstract

The invention relates to a preparation method of diethylene monoisopropanolamine. The preparation method comprises the following steps of (1) introducing an inert gas to replace air inside a reaction kettle into the reaction kettle; (2) premixing epoxy propane and diethanolamine, then adding to the reaction kettle, introducing the inert gas to keep the pressure inside the reaction kettle to 0.1-0.5 Mpa, stirring and mixing materials, then raising temperature, keeping the temperature, and reacting to obtain a diethylene monoisopropanolamine product. According to the preparation method disclosed by the invention, diethanolamine and epoxy propane are utilized as raw materials and the conventional way of taking water as a solvent is abandoned, and the materials are premixed, so that the viscosity and solidification point of the reacted materials are reduced; the fast progress of reaction is facilitated due to the uniform dispersion of the two materials in a reactor; in addition, under the condition of low alkane-amine ratio, the improvement of the utilization ratio of epoxy propane and the reduction of generation probability of side reaction are facilitated. The whole process has the advantages of low energy consumption, high material transformation rate, high product purity, stable quality and no wastes.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of high-purity diethanol monoisopropanolamine. Background technique [0002] Diethanolamine monoisopropanolamine is a low-toxic, environmentally friendly alcohol amine fine chemical product, mainly used in surfactants, widely used in chemical raw materials, pigments, medicine, building materials and other fields, in cement additives , Skin care products and fabric softener are widely used. [0003] At present, in the field of cement grinding aids, most of its formulas are single or compound products of chemical raw materials such as alcohols, alcohol amines, and acetates. It has a strengthening effect on cement, so the development and application of cement grinding aids with high grinding aid and high strength enhancement performance have been paid more and more attention. Compared with other similar cement additive products, diethanol monoisopropanolamine (...

AI Technical Summary

Problems solved by technology

[0005] Patent CN10292403A discloses a method for preparing diethanol monoisopropanolamine using water as a solvent, DEA and propylene oxide as raw materials in the presence of a polymerization inhibitor. The defect of this method is that the vacuum degree of the distillation process is high , the requirements for production equipment are higher; at the same time, the addition of polymerization inhibitors makes the reaction system more complicated, and there will be residual bottoms after distillation, which is difficult to handle

[0006] Patent CN103224453A uses water as a solvent, and uses propylene oxide and diethanolamine as raw materials to prepare diethanol monoisopropanolamine. The defect of this method is that the alkylamine is relatively high, and excessive propylene oxide is difficult to recycle. At the same time, excessive epoxy Propane will accelerate the formation of by-products, and the presence of solvent water makes propylene oxide partially hydrolyzed, reducing the utilization rate of propylene oxide

[0007] Above-mentioned patent document, its material all adopts the feeding method of dripping propylene oxide, and the defect of this feeding method is that in the middle and late stage of charging, the diethanolamine content in the reaction system decreases gradually, and diethanol monoisopropanol As the amine content continues to increase, the probability of side reactions also gradually increases, so there are more by-products