A triethanolamine thin film evaporation device

Abstract

The utility model discloses a kind of triethanolamine film evaporation devices, including film scraper evaporator, film scraper evaporator is used to carry out distillation separation to raw material, the side of film scraper evaporator is provided with preheater, preheater is used to preheat raw material, the other side of film scraper evaporator is provided with primary condenser, primary condenser is used to condense gas generated by raw material evaporation, the lower end of film scraper evaporator is connected with heavy phase tank, heavy phase tank is used to heat raw material in tank, pump is connected with discharge pipe in heavy phase tank bottom, pump is respectively connected buffer tank and raw material tank, and the production advantage of this triethanolamine film evaporation device is: more efficient distillation separation, product purity is guaranteed, energy consumption and operation are more optimized.

Description

Technical Field

[0001] This utility model relates to the technical field of triethanolamine production equipment, specifically a triethanolamine thin-film evaporation device. Background Technology

[0002] Triethanolamine can be considered a trihydroxy-substituted derivative of triethylamine, obtained by ammonolysis of ethylene oxide. It contains three hydroxyethyl groups and one tertiary amine structure, exhibiting strong polarity and basicity. It is a colorless to slightly yellow viscous liquid with a slight ammonia odor, readily soluble in water and ethanol, and strongly alkaline.

[0003] The high price of raw materials and the large amount of byproducts in the current production of triethanolamine make it difficult for traditional methods to compete with the mainstream ethylene oxide process in terms of cost. In addition, the low purity of the product cannot meet the demand for high-purity triethanolamine in high-end fields such as pharmaceuticals and cosmetics. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a triethanolamine thin-film evaporation device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a triethanolamine thin-film evaporation device, comprising a thin-film scraped evaporator for distilling and separating raw materials; a preheater is provided on one side of the thin-film scraped evaporator for preheating the raw materials; a primary condenser is provided on the other side of the thin-film scraped evaporator for condensing the gas generated by the evaporation of the raw materials; a heavy phase tank is connected to the lower end of the thin-film scraped evaporator for heating the raw materials inside the tank; a pump is connected to the discharge pipe at the bottom of the heavy phase tank, and the pump is connected to a buffer tank and a raw material tank respectively.

[0006] Preferably, the thin-film scraped evaporator and preheater contain heat transfer oil, which is heated by a high-temperature unit.

[0007] Preferably, a flow meter is installed on the outside of the preheater, a regulating valve is installed on the outside of the preheater, and a temperature monitoring device is installed on the outside of the preheater. The flow rate of the heat transfer oil is controlled by the interlocking of the flow meter and the regulating valve.

[0008] Preferably, the vapor phase outlet of the thin-film scraped evaporator is designed with temperature monitoring and vacuum monitoring, and the liquid phase outlet of the thin-film scraped evaporator is equipped with a temperature monitoring device.

[0009] Preferably, the heavy phase tank is equipped with an outer half-pipe, a pressure monitoring system, a liquid level monitoring system, a temperature monitoring system, a nitrogen inlet, a tail gas inlet, a vacuum inlet, a cleaning inlet, a drain inlet, and a discharge outlet.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] More efficient distillation and separation: Thin-film scraped evaporators enable triethanolamine feedstock to form an extremely thin liquid film, increasing the heat transfer area and allowing for rapid liquid film renewal, which significantly improves the evaporation rate, shortens the separation time, and meets the distillation requirements of triethanolamine.

[0012] Product purity is guaranteed: the primary condenser can quickly condense and evaporate the gas, reducing the residue of light component impurities; the heating design of the heavy phase tank can further separate the heavy components in the raw material, providing double protection for the purity of triethanolamine products.

[0013] Energy consumption and operation are optimized: the preheater preheats the raw materials, reducing the heat load of the thin film scraper evaporator and reducing overall energy consumption; the bottom pump of the heavy phase tank is connected to the buffer tank and the raw material tank, which can realize material circulation and stable discharge, making operation flexible and stable, and reducing the risk of production fluctuations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a top enlarged sectional view of the thin-film scraper evaporator of this utility model;

[0016] Figure 3 This is a cross-sectional view of the primary condenser of this utility model;

[0017] Figure 4 This is a cross-sectional view of the heavy phase tank of this utility model.

[0018] In the diagram: 1 Thin-film scraped evaporator, 11 Preheater, 12 First-stage condenser, 13 Heavy phase tank. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4The diagram shows a triethanolamine thin-film evaporation apparatus, including a thin-film scraped evaporator 1, which is used to distill and separate the raw material. A preheater 11 is provided on one side of the thin-film scraped evaporator 1 to preheat the raw material. A primary condenser 12 is provided on the other side of the thin-film scraped evaporator 1 to condense the gas generated by the evaporation of the raw material. A heavy phase tank 13 is connected to the lower end of the thin-film scraped evaporator 1 to heat the raw material inside the tank. A pump is connected to the discharge pipe at the bottom of the heavy phase tank 13, and the pump is connected to a buffer tank and a raw material tank respectively.

[0021] Please see Figure 1-2 The thin-film scraped evaporator 1 and the preheater 11 contain heat transfer oil, which is heated by a high-temperature unit.

[0022] With this setup, the thin-film scraped evaporator 1 can form an extremely thin liquid film from the triethanolamine raw material, increasing the heat transfer area and allowing for rapid liquid film renewal, thus significantly improving the evaporation rate, shortening the separation time, and meeting the distillation requirements of triethanolamine.

[0023] Please see Figure 1-4 A flow meter is installed on the outside of the preheater 11, a regulating valve is installed on the outside of the preheater 11, and a temperature monitoring device is installed on the outside of the preheater 11. The flow rate of the heat transfer oil is controlled by the interlock between the flow meter and the regulating valve.

[0024] With this setup, the primary condenser 12 can quickly condense the evaporated gas, reducing the residue of light component impurities; the heating design of the heavy phase tank 13 can further separate the heavy components in the raw material, providing double protection for the purity of the triethanolamine product.

[0025] Please see Figure 1-2 The gas phase outlet of the thin-film scraped evaporator 1 is designed with temperature monitoring and vacuum monitoring, and the liquid phase outlet of the thin-film scraped evaporator 1 is equipped with a temperature monitoring device.

[0026] With this setup, the preheater 11 preheats the raw materials, reducing the heat load on the thin-film scraper evaporator 1 and decreasing overall energy consumption.

[0027] Please see Figure 4 The heavy phase tank 13 is equipped with an outer half-pipe, pressure monitoring, liquid level monitoring, temperature monitoring, nitrogen port, exhaust port, vacuum port, cleaning port, venting port, and discharge port.

[0028] With this setup, the bottom pump of the heavy phase tank 13 is connected to the buffer tank and the raw material tank, which enables material circulation, stable discharge, flexible operation, and stable running, reducing the risk of production fluctuations.

[0029] The working principle of this embodiment is as follows: The raw material is pumped to a preheater for preheating, and then enters a thin-film evaporator for separation. The tube side of the preheater is made of 31603 stainless steel, and the shell side is made of 30408 ​​stainless steel. The inner surface of the preheater is electrolytically polished. Heat transfer oil is introduced into the shell side of the preheater, and the flow rate of the heat transfer oil is controlled by an interlock between a flow meter and a regulating valve to heat the material. The preheater is equipped with temperature monitoring. The material preheated to approximately 120°C is then conveyed to the thin-film evaporator.

[0030] The thin-film evaporator shell is made of 31603 stainless steel, and the jacket is made of 30408 ​​stainless steel, with the inner surface electropolished. The thin-film evaporator is heated by heat transfer oil, and the flow rate of the heat transfer oil is controlled by an interlocking flow meter and regulating valve. The thin-film evaporation process operates under negative pressure, with both the gas phase outlet temperature and liquid phase outlet temperature monitored. Heavy components from the thin-film evaporator are buffered in a heavy phase tank, while the light components, mainly in gaseous state, are sent to the primary condenser for condensation.

[0031] The heavy components are buffered in a heavy phase tank, which is equipped with an external coil for heat tracing. Hot water from the client is supplied through the coil, and the hot water flow rate is controlled by an interlocking flow meter and regulating valve to heat the material inside the tank, maintaining the material temperature at approximately 50-60℃ to ensure the fluidity of the raw material. The raw material tank body is made of S31603 material, and the external coil is made of S30408 ​​material. The heavy phase tank is a non-high-purity design, and its inner surface undergoes mirror polishing and degreasing treatment.

[0032] The heavy phase tank is designed with pressure monitoring, liquid level monitoring, temperature monitoring, nitrogen inlet, exhaust gas inlet, vacuum inlet, cleaning inlet, venting inlet, and discharge outlet. Material exits from the bottom of the heavy phase tank and is pumped to the client's residual liquid buffer tank or to the raw material tank for further purification, thereby improving product yield.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A triethanolamine thin-film evaporation apparatus, characterized in that: The device includes a thin-film scraped evaporator (1) for distilling and separating raw materials. A preheater (11) is provided on one side of the thin-film scraped evaporator (1) for preheating the raw materials. A primary condenser (12) is provided on the other side of the thin-film scraped evaporator (1) for condensing the gas generated by the evaporation of the raw materials. A heavy phase tank (13) is connected to the lower end of the thin-film scraped evaporator (1) for heating the raw materials in the tank. A pump is connected to the discharge pipe at the bottom of the heavy phase tank (13). The pump is connected to a buffer tank and a raw material tank respectively.

2. The triethanolamine thin-film evaporation apparatus according to claim 1, characterized in that: The thin-film scraped evaporator (1) and the preheater (11) contain heat transfer oil, which is heated by a high-temperature unit.

3. The triethanolamine thin-film evaporation apparatus according to claim 1, characterized in that: A flow meter is provided on the outside of the preheater (11), a regulating valve is provided on the outside of the preheater (11), a temperature monitoring device is provided on the outside of the preheater (11), and the flow rate of the heat transfer oil is controlled by the interlocking of the flow meter and the regulating valve in the preheater (11).

4. The triethanolamine thin-film evaporation apparatus according to claim 1, characterized in that: The gas phase outlet of the thin-film scraped evaporator (1) is designed with temperature monitoring and vacuum monitoring, and the liquid phase outlet of the thin-film scraped evaporator (1) is equipped with a temperature monitoring device.

5. The triethanolamine thin-film evaporation apparatus according to claim 1, characterized in that: The heavy phase tank (13) is equipped with an outer half-pipe, a pressure monitoring system, a liquid level monitoring system, a temperature monitoring system, a nitrogen port, a tail gas port, a vacuum port, a cleaning port, a drain port, and a discharge port.

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