A continuous separation and purification device and method for behenic acid amide

Abstract

The invention provides a continuous separation and purification device and method for behenamide. The continuous separation and purification device for behenamide is characterized by comprising a coarse product storage tank, a first-stage falling film evaporation device and a second-stage rotary wiped film short-path distillation device which are sequentially connected, wherein the first-stage falling film evaporation device is used for distilling and separating a light component; and the second-stage rotary wiped film short-path distillation device is used for distilling behenamide and separating behenamide from a heavy component. Through first-stage falling film distillation, low-boiling substances affecting the color and luster, the odor and the melting point of a product are separated by using falling film heating evaporation and short-path distillation; through second-stage rotary wiped film short-path distillation, behenamide is distilled by adopting the rotary wiped film short-path distillation device, and is separated from high-boiling substances which are large in viscosity and high in color and luster, so that continuous and automatic stable production capable of separating and purifying high-melting-point and high-boiling-point substances is achieved. The continuous separation and purification device has the advantages of high pertinence, good separation effect, simple and practical process device, high product yield, stable quality and low processing cost.

Description

technical field [0001] The invention relates to a method for separation and purification of amide wax with high melting point and high boiling point, in particular to a continuous separation and purification device and method for behenic acid amide. Background technique [0002] Behenic acid amide (CASNO: 3061-75-4) is a very important processing aid in polymer materials, widely used as CPP, BOPP, BOPET, BOPS, BOPA, BOPCA, BOPEN, POE, LLDPE, EVA and Opening anti-sticking agent and anti-scratch agent for composite films; bright release agent and in-mold flow accelerator for engineering plastics; antistatic agent and lubricant for data transmission lines; slippery agent and release agent for rubber gaskets for capacitors release agents and lubricants for thermoplastic elastomers; processing aids in 3D printing consumables; drag reducers for natural gas pipelines, etc. There is an urgent need for high-end products with high purity and good stability in the market. [0003] The...

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Problems solved by technology

[0003] The behenic acid amide product synthesized by the existing technology and equipment has darker color, lower melting point, higher viscosity, poor fluidity, and contains a small amount of low boiling matter and high boiling matter, which affects the application performance of the product. It is not suitable for direct addition and use. Separation and purification, this process is very critical to the yield and quality of the product. The conventional solvent recrystallization purification method needs to go through processes such as solvent dissolution, activated carbon decolorization, hot filtration, cooling crystallization, re-filtration, drying, and solvent recovery. There are many processes, long process, low yield, high cost, and due to the high melting point of behenic acid amide (>105°C), the dissolution temperature is high, the solvent is highly volatile, and the operating environment is poor; the primary fatty acid amide three disclosed in the patent 200710144026.3 Level continuous separation and purification process, the separation of low boilers is not complete, and the material system is easy to block, it is difficult to operate continuously and stably, and it is not suitable for high melting point products

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