Three-stage continuous separation and purification technique of fatty primary amide

Abstract

The invention discloses a three-stage continuous separation and purification process for primary fattiness acidamide, which comprises the following steps: the first-stage falling-film flashing of removing the dissolved gas, water and volatile impurities; the second-stage rotary film distillation of removing the low-boiling residues through the distillation which are easy to be oxidated discolored and off odor; and the third-stage short-path molecular distillation of separating the primary fattiness acidamide from the polymer products and pigments so as to realize the continuous clean production, lead to the obviously enhanced yield and quality of the products and solve the problems of maximization and long-term operation of the device. The invention can serve as a substitution for the traditional solvent purification process and vacuum distillation process and is suitable for the separation and purification of the oleamide, Erucic amide, stearamide, behenamide, lauramide, palmitic amide, 12-hydroxy stearamide and peanut amide.

Description

technical field [0001] The present invention relates to the purification technology of oil fine chemicals, especially relates to a kind of primary fatty acid amide Three-stage continuous separation and purification process. Background technique [0002] Primary fatty acid amides are non-ionic surfactants and oil fine chemicals with very broad application prospects. The main varieties are oleic acid amide, erucamide, stearamide, behenamide, lauramide, arachidamide, palmitamide, 12-Hydroxystearamide, etc., due to the limitation of production process and equipment conditions, the synthetic product (primary fatty acid amide) has low purity, many impurities, deep color, high viscosity, poor fluidity, and peculiar smell, so it cannot be directly used in the industrial field. , need to be separated and purified. There are two traditional separation and purification processes: solvent purification process and vacuum distillation process: 1. Solvent purification process must be di...

AI Technical Summary

Problems solved by technology

There are two traditional separation and purification processes: solvent purification process and vacuum distillation process: 1. Solvent purification process must be dissolved in solvent (alcohol), decolorized by activated carbon, filtered while hot, cooled and crystallized, filtered, dried, solvent recovery and other processes. Many, long process, poor operating environment, high labor intensity, many mechanical impurities in the product, low yield (about 75%), and high cost; 2. The vacuum distillation process is a single-pot intermittent operation, with high evaporation temperature and long residence time in the still (3-10h), prone to decomposition, polymerization, oxidation and other reactions, the product has a deep color (>500Hazen), poor product consistency, low product yield (70-80%), and high processing costs

[0003] The above two separation and purification processes are difficult to monitor automatically, and can only be observed and operated manually. The process control has great uncertainty, it is difficult to form continuous and stable production, and there are many environmental protection and safety hazards

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