CN219481594U

CN219481594U - Vacuum separation device for triethyl phosphate and ethanol

Info

Publication number: CN219481594U
Application number: CN202320879830.0U
Authority: CN
Inventors: 李东亮; 王新刚; 陈江; 陈畏畏; 欧阳乐; 周航; 曹洪科; 王秀山
Original assignee: Shandong Wansheng New Material Co ltd
Current assignee: Shandong Wansheng New Material Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-08-08
Anticipated expiration: 2033-04-19

Abstract

The utility model relates to the technical field of chemical production devices, and particularly discloses a vacuum separation device for triethyl phosphate and ethanol. The separation device comprises a sectional dealcoholization tower, and ethanol is distilled and removed under the condition of reduced pressure; the vapor distilled from the top sequentially passes through a third-stage condenser, the first-stage condenser condenses the fraction with higher boiling point and the pre-cooling of the ethanol vapor, the condensate is mainly used for reflux, and the second-stage condenser and the third-stage condenser adopt deep cooling to condense the ethanol vapor. The device reduces the energy consumption of dealcoholization in the production process of the triethyl phosphate, and reduces the impurity content of the recovered ethanol.

Description

Vacuum separation device for triethyl phosphate and ethanol

Technical Field

The utility model relates to the technical field of chemical production devices, in particular to a vacuum separation device for triethyl phosphate and ethanol.

Background

Ethanol is an organic compound with a chemical formula of CH ₃ CH ₂ OH is a flammable and volatile colorless transparent liquid at normal temperature and normal pressure, the boiling point of the OH is 78.3 ℃, the melting point of the OH is-114.1 ℃, the relative density of the OH is 0.816, ethanol vapor can form an explosive mixture with air, and the OH vapor and the air can be mutually dissolved with water in any ratio. In the process of producing triethyl phosphate, in order to increase the yield of the triethyl phosphate, the input amount of ethanol is often increased, and the ethanol, the triethyl phosphate and water are completely miscible, so that the post-treatment is difficult, the energy consumption of a dealcoholization procedure in the post-treatment of producing the triethyl phosphate by the method is high, the impurity content of dealcoholization products is high, and the like, and therefore, the research of a separation device of the triethyl phosphate and the ethanol is particularly important.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present utility model is to provide a vacuum separation apparatus for triethyl phosphate and ethanol, which comprises a dealcoholization distillation column and a progressive condenser.

The utility model discloses a vacuum separation device for triethyl phosphate and ethanol, which comprises a dealcoholization tower and a condenser, wherein the dealcoholization tower adopts a sectional heating structure and is formed by connecting a primary rectifying tower and a secondary rectifying tower up and down, a material inlet, an air outlet and a reflux port are arranged on the primary rectifying tower, a material outlet is arranged at the bottom of the secondary rectifying tower, the condenser at least comprises a primary condenser and a secondary condenser, an air inlet at the top of the primary condenser is connected with the air outlet on the primary rectifying tower, a liquid outlet at the bottom of the primary condenser is connected with the reflux port on the primary rectifying tower to form a circulating system, and cooled triethyl phosphate, ethanol and the like are returned into the primary rectifying tower; the gas phase discharge port on the side surface of the first-stage condenser is connected with the feed inlet of the second-stage condenser, and the feed liquid is collected after being condensed by the second-stage condenser to obtain the ethanol.

Furthermore, the utility model also defines that a hot water outlet and a hot water inlet are arranged on the shell side of the primary rectifying tower, and hot water is used as a heating medium; the shell side of the second-stage rectifying tower is provided with a steam inlet and a steam condensate outlet, supersaturated steam is used as a heating medium, namely, the two-stage rectifying towers are different in temperature, the first-stage dealcoholization temperature is low, the second-stage dealcoholization temperature is high, and the dealcoholization effect is improved by utilization.

Furthermore, the utility model also defines that the condenser further comprises a third-stage condenser, wherein the feed inlet of the third-stage condenser is connected with the gas-phase discharge outlet of the second-stage condenser, the feed liquid of the second-stage condenser is further cooled, and the liquid outlets at the bottoms of the second-stage condenser and the third-stage condenser are connected with a collector to collect ethanol.

Furthermore, the utility model also defines that the condensing medium adopted by the first-stage condenser is circulating water, the condensing medium of the second-stage condenser and the third-stage condenser is ice brine at the temperature of minus 20 ℃ to minus 25 ℃, and in the first-stage condensation process, triethyl phosphate is cooled down and returned into the first-stage rectifying tower through a liquid outlet at the bottom to form circulation; the uncooled ethanol sequentially enters the secondary condenser and the tertiary condenser, and is collected through a liquid outlet after being cooled again.

Further, the utility model also defines the dealcoholization tower as a graphite falling film evaporator.

According to the utility model, the sectional dealcoholization tower is adopted to carry out graded dealcoholization according to different temperatures, so that the efficient separation of the triethyl phosphate and the ethanol is realized, the energy consumption is saved, the separated ethanol adopts multistage condensation treatment of different refrigerants, the purity of the ethanol is greatly improved, the cyclic utilization can be realized, and the content of the ethanol is greatly reduced in the triethyl phosphate treated by the device, so that the rectification pressure of the subsequent triethyl phosphate is reduced, and the product quality is improved.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

In the figure: 1. a first-stage rectifying tower; 2. a second-stage rectifying tower; 3. a first-stage condenser; 4. a second-stage condenser; 5. a three-stage condenser; 6. a material inlet; 7. a hot water outlet; 8. a hot water inlet; 9. a steam inlet; 10. a steam condensate outlet; 11. and a material outlet.

Detailed Description

The utility model will be further described with reference to the drawings and examples of the specification, but the scope of the utility model is not limited thereto.

As shown in figure 1, the vacuum separation device for triethyl phosphate and ethanol comprises a dealcoholization tower and a condenser, wherein the dealcoholization tower adopts a sectional heating structure, namely a primary rectifying tower 1 and a secondary rectifying tower 2 are fixedly connected up and down, the two rectifying towers are of a graphite falling film evaporator structure, the tube passes of the two rectifying towers are communicated, the upper end part of the tube pass of the primary rectifying tower 1 is provided with a material inlet 6, an air outlet and a reflux port, the upper end of the shell pass is provided with a hot water outlet 7, and the lower end part of the shell pass is provided with a hot water inlet 8, and hot water is used as a heat exchange medium; the upper end of the tube side of the secondary rectifying tower 2 is communicated with the lower end of the primary rectifying tower 1, the lower end of the tube side of the secondary rectifying tower 2 is provided with a material outlet 11 for discharging and collecting high-purity triethyl phosphate, the upper end of the shell side of the secondary rectifying tower 2 is provided with a steam inlet 9, the lower end of the shell side of the secondary rectifying tower 2 is provided with a steam condensate outlet 10, and reflux liquid is subjected to heat exchange treatment through saturated steam; the embodiment of the utility model comprises a plurality of condensers, namely 3 condensers, namely a first condenser 3, a second condenser 4 and a third condenser 5, wherein the condensation medium adopted by the first condenser 3 is circulating water, the condensation medium adopted by the second condenser 4 and the third condenser 5 is ice brine at the temperature of minus 20 ℃ to minus 25 ℃, an air inlet at the top of the first condenser 3 is connected with an air outlet on the first rectifying tower 1, a liquid outlet at the bottom of the first condenser 3 is connected with a reflux outlet on the first rectifying tower 1 to form a circulating system, cooled triethyl phosphate, ethanol and the like can be returned into the first rectifying tower 1, a gas phase outlet at the side surface of the first condenser 3 is connected with a feed inlet of the second condenser 4, ethanol gas is subjected to second condensation, ethanol gas which is not completely condensed enters the third condenser 5 from the right side of the second condenser 4, stays at the bottom after being condensed by the third condenser 5, and the condensed ethanol flows out of the gas phase outlets at the bottoms of the second condenser 4 and the third condenser 5 and enters a collecting tank for collection.

Examples: under the condition of meeting the vacuum degree and temperature requirements, a mixture of material triethyl phosphate and ethanol enters from a material inlet 6 at the top of a tube side of the primary rectifying tower 1, the temperature of the primary rectifying tower 1 is maintained at 80-90 ℃ after the mixture is heated by hot water on the primary rectifying tower 1, the ethanol maintains a vapor state, the mixture is subjected to material exchange with reflux liquid, the ethanol in the vapor is further concentrated, the material continuously enters the secondary rectifying tower 2, under the heating of supersaturated vapor, the ethanol and part of the triethyl phosphate are sequentially converted into vapor, the material exchange with the reflux liquid is performed to concentrate the triethyl phosphate, and the concentrated triethyl phosphate flows out from a gas phase discharge port at the bottom of the secondary rectifying tower 2 and is collected; the steam flows out from a steam port at the top of the primary rectifying tower 1 and enters the primary condenser 3, the temperature of the primary condenser 3 is kept at 50-60 ℃ under the action of cooling water, substances with high boiling point such as triethyl phosphate are condensed and then returned to the primary rectifying tower 1 from a gas phase discharge port at the bottom of the primary condenser 3, the substances are exchanged as reflux liquid, the ethanol steam enters the secondary condenser 4 and the tertiary condenser 5, the temperature of the secondary condenser 4 and the tertiary condenser 5 is kept at-20 to-25 ℃ under the action of brine ice, and the ethanol steam is subjected to secondary condensation to obtain high-purity ethanol and is recycled.

Claims

1. The vacuum separation device for the triethyl phosphate and the ethanol comprises a dealcoholization tower and a condenser, and is characterized in that the dealcoholization tower adopts a sectional heating structure and is formed by connecting a primary rectifying tower (1) and a secondary rectifying tower (2) up and down, a material inlet (6), an air outlet and a reflux port are arranged on the primary rectifying tower (1), a material outlet (11) is arranged at the bottom of the secondary rectifying tower (2), the condenser at least comprises a primary condenser (3) and a secondary condenser (4), an air inlet at the top of the primary condenser (3) is connected with an air outlet on the primary rectifying tower (1), a liquid outlet at the bottom of the primary condenser (3) is connected with a reflux port on the primary rectifying tower (1), and a circulation system is formed to return the cooled triethyl phosphate and the cooled ethanol into the primary rectifying tower (1); the gas phase discharge port on the side surface of the first-stage condenser (3) is connected with the feed inlet of the second-stage condenser (4), and the feed liquid is collected after being condensed by the second-stage condenser (4) to obtain ethanol.

2. The vacuum separation device of triethyl phosphate and ethanol according to claim 1, wherein a hot water outlet (7) and a hot water inlet (8) are arranged on the shell side of the primary rectifying tower (1), and hot water is used as a heating medium; a steam inlet (9) and a steam condensate outlet (10) are arranged on the shell side of the secondary rectifying tower (2), and supersaturated steam is used as a heating medium.

3. The vacuum separation device for triethyl phosphate and ethanol according to claim 1, wherein the condenser further comprises a three-stage condenser (5), a feed inlet of the three-stage condenser (5) is connected with a gas-phase discharge port of the two-stage condenser (4), the feed liquid of the two-stage condenser (4) is further cooled, and a liquid outlet at the bottoms of the two-stage condenser (4) and the three-stage condenser (5) is connected with a collector to collect ethanol.

4. The vacuum separation device for triethyl phosphate and ethanol according to claim 1, wherein the condensing medium adopted by the condenser (3) is circulating water, and the condensing medium of the secondary condenser (4) and the third condenser (5) is ice brine at-20 to-25 ℃.

5. The vacuum separation apparatus for triethyl phosphate and ethanol according to any one of claims 1 to 4, wherein the dealcoholization tower is a graphite falling film evaporator.