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CN-122006283-A - Deamination system for product refining

CN122006283ACN 122006283 ACN122006283 ACN 122006283ACN-122006283-A

Abstract

A deamination system for product refining relates to deamination technical field, including deamination tower, deamination tower top and bottom are equipped with gas vent and leakage fluid dram respectively, and deamination tower upper outer wall and lower outer wall are equipped with inlet and backward flow mouth respectively, and deamination tower side is equipped with the falling film reboiler, and the leakage fluid dram passes through backward flow circulating pump and falling film reboiler entry end intercommunication, falling film reboiler exit end and backward flow mouth intercommunication, deamination tower side be equipped with the condensation subassembly of gas vent intercommunication. The invention solves the problems of high content of entrained products and poor deamination effect when the existing deamination system separates ammonia.

Inventors

  • WANG KAI
  • HOU XIAOWEI
  • WANG GUIPING

Assignees

  • 寿光德信化学制品有限公司

Dates

Publication Date
20260512
Application Date
20260209

Claims (7)

  1. 1. A deamination system for product refining is characterized by comprising a deamination tower (1), wherein an exhaust port (2) and a liquid outlet (12) are respectively arranged at the top and the bottom of the deamination tower (1), a liquid inlet (11) and a reflux port (16) are respectively arranged on the upper outer wall and the lower outer wall of the deamination tower (1), a falling film reboiler (17) is arranged on the side of the deamination tower (1), the liquid outlet (12) is communicated with the inlet end of the falling film reboiler (17) through a reflux circulating pump (13), the outlet end of the falling film reboiler (17) is communicated with the reflux port (16), and a condensing assembly (5) communicated with the exhaust port (2) is arranged on the side of the deamination tower (1).
  2. 2. The deamination system for product refinement according to claim 1, wherein the condensation assembly (5) comprises a primary condenser (4), a secondary condenser (6) and a temporary storage tank (7) which are sequentially communicated, the exhaust port (2) is communicated with the primary condenser (4), a liquid return port (3) is arranged at a position, above the liquid inlet (11), of the outer wall of the deamination tower (1), and a liquid outlet of the lower outer wall of the temporary storage tank (7) is communicated with the liquid return port (3) through a liquid return circulating pump (9).
  3. 3. The deamination system for product refinement according to claim 2, characterized in that a first liquid distributor (19) is fixedly arranged on the inner wall of the deamination tower (1) at a position below the liquid inlet (11), a first packing layer (18) is arranged below the first liquid distributor (19), the liquid inlet (11) is communicated with the first liquid distributor (19), and the first packing layer (18) is arranged above the backflow port (16).
  4. 4. A deamination system for product refinement according to claim 3 is characterized in that a second liquid distributor (22) is fixedly arranged on the inner wall of the deamination tower (1) below the liquid return port (3), a second packing layer (21) is arranged below the second liquid distributor (22), and the liquid return port (3) is communicated with the second liquid distributor (22).
  5. 5. A deamination system for product refinement as claimed in claim 4 wherein a liquid collector (20) is provided at a position of the inner wall of the deamination column (1) below the second packing layer (21), said liquid collector (20) being in communication with the first liquid distributor (19).
  6. 6. The deamination system for product refining according to claim 1, wherein a product tank (14) is arranged on the side of the deamination tower (1), an outlet end of the reflux circulating pump (13) is connected with a pneumatic three-way valve (15), the pneumatic three-way valve (15) is one-inlet two-outlet, and two outlet ends of the pneumatic three-way valve (15) are correspondingly communicated with a falling film reboiler (17) and the product tank (14).
  7. 7. The deamination system for product refinement according to claim 2, wherein a collecting tank (8) is arranged on the side of the temporary storage tank (7), an air outlet of the upper outer wall of the temporary storage tank (7) is communicated with the collecting tank (8), an electric three-way valve (10) is connected to the outlet end of the liquid return circulating pump (9), the electric three-way valve (10) is a one-inlet two-outlet type, and two outlet ends of the electric three-way valve (10) are correspondingly communicated with the liquid return port (3) and the collecting tank (8).

Description

Deamination system for product refining Technical Field The invention relates to the technical field of deamination, in particular to a deamination system for product refining. Background Polyethylene polyamine is an important aliphatic amine compound, generally comprises a series of products such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine and the like, and has wide application in a plurality of industrial fields such as epoxy resin curing agents, chelating agents, lubricating oil additives, surfactants and the like. In the industrial production and preparation process, ammonia as a byproduct is generated in the reaction system. Therefore, in order to ensure the purity, performance stability and meet the stringent requirements of downstream applications for low ammonia content of the final product, the product must be effectively stripped of dissolved or residual ammonia by distillation in a subsequent refining process, which is also critical to optimize the amine number, color and storage stability of the product. The existing deamination system gradually exposes the defects in the use process, and the defects are mainly represented by the following aspects: First, the content of entrained products in separated ammonia is high, specifically, in the process of separating ammonia in the product by utilizing distillation technology, due to severe boiling and gas-liquid entrainment effect during distillation, part of the high boiling products can escape together with gaseous ammonia in the form of mist or liquid drops into gas phase fractions, when the mixed gas enters a condenser to be cooled, the gaseous ammonia is condensed into liquid ammonia, and meanwhile, entrained liquid products are retained in the condensed liquid ammonia, finally, the condensed and recovered liquid ammonia contains other product components with higher concentration, which not only causes impurity in ammonia separation and high content of entrained products, but also means that valuable products are lost in the ammonia phase, thereby seriously affecting the separation effect and economic benefit. Secondly, the deamination effect is poor, specifically, in the process of distilling and separating ammonia in liquid products, the ammonia removal is realized by continuously feeding and heating materials in the kettle, namely, the high-temperature kettle bottom liquid products are heated and gasified to flow upwards, the fresh liquid products with lower temperature flow in from the upper end of the kettle body, and the high-temperature kettle bottom liquid products and the fresh liquid products are in countercurrent contact with the filler to carry out heat and mass transfer, so that ammonia components in the liquid are continuously gasified and carried out, however, the existing distillation kettle body generally adopts a coil pipe or a tube array fixedly arranged in the interior to heat the bottom liquid, and the static heating mode is extremely easy to cause uneven distribution of components in the liquid in the kettle, so that the stripping effect of the ammonia components from the liquid phase is seriously affected. In summary, it is clear that the prior art has inconvenience and defects in practical use, so that improvement is needed. Disclosure of Invention Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide the deamination system for refining the product, which can carry out repeated distillation and condensation purification on the liquid ammonia after primary condensation and separation, greatly reduce the content of other products carried in the final recovered liquid ammonia, and remarkably improve the separation effect on ammonia components in the initial liquid product and the purity of the product; The system can enable the liquid product at the bottom of the kettle body to circularly flow and heat, and the dynamic heating mode effectively promotes the uniformity of the distribution of the components in the liquid product in the kettle, thereby being beneficial to the separation of the ammonia component from the liquid phase and remarkably improving the separation effect of the ammonia component in the liquid product. In order to solve the problems, the invention provides the following technical scheme: The utility model provides a deamination system for product is refined, includes the deamination tower, deamination tower top and bottom are equipped with gas vent and leakage fluid dram respectively, deamination tower upper outer wall and lower outer wall are equipped with inlet and backward flow mouth respectively, deamination tower side is equipped with the falling film reboiler, the leakage fluid dram passes through backward flow circulating pump and falls film reboiler entry end intercommunication, falling film reboiler exit end and backward flow mouth intercommunication, deamination tower side is equipped with the condensation subassembly wit