An apparatus for recovering diluent from diluent waste liquor and methods of using the same

Abstract

The application relates to the chemical technology field and discloses a device for recovering diluent from diluent waste liquid and a use method thereof, which comprises a vacuum distillation tank and a hot water tank, a heating coil is fixedly arranged in the cavity of the vacuum distillation tank, a heat preservation heating disc is fixedly arranged on the outer wall of the vacuum distillation tank, a condensate water return main pipe is connected to the input end of the hot water tank, a second water return pipe is connected between the output end of the heating coil and the condensate water return main pipe, and a first water return pipe is connected between the output end of the heat preservation heating disc and the condensate water return main pipe. The application provides a method for separating effective components of diluent from diluent organic waste, realizes the recycling of the diluent, solves the problem of easy high-temperature coking in the prior art by means of high-temperature steam, reduces the workload of cleaning residues, avoids the limitation of the operation space of personnel and the operation risks and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of chemical technology, and particularly relates to a device for recovering diluent from diluent waste liquid and a use method thereof. BACKGROUND

[0002] The existing diluent recovery scheme is carried out in a steam heating distillation manner. A large amount of non-volatile components are contained in the diluent waste liquid, which cokes at high temperature of steam and condenses on the heating surface, affecting the heat exchange effect and slowing down the production speed until it is basically stagnant. Therefore, when the prior art is used, the coke on the heating surface needs to be cleaned, the hardness of the coke is high, cleaning is difficult, and the cost is high when other solvents are used for cleaning. There are also cross-contamination risks between raw materials, and problems such as slow manual cleaning speed, limited operation space, and operation risks. SUMMARY

[0003] The present application aims to provide a device for recovering diluent from diluent waste liquid and a use method thereof, which solves the problem of easy high-temperature coking in the prior art, reduces the workload of cleaning residues, and avoids problems such as limited personnel operation space and operation risks.

[0004] The purpose of the present application is achieved by comprising a vacuum distillation tank 10 and a hot water tank 16. The vacuum distillation tank 10 is characterized in that a heating coil 11 is fixedly arranged in the cavity of the vacuum distillation tank 10, a heat preservation heating disc 12 is fixedly arranged on the outer wall of the vacuum distillation tank 10, a condensate water return main pipe 15 is connected to the input end of the hot water tank 16, a second water return pipe 14 is connected between the output end of the heating coil 11 and the condensate water return main pipe 15, and a first water return pipe 13 is connected between the output end of the heat preservation heating disc 12 and the condensate water return main pipe 15.

[0005] A temperature automatic control instrument 18 and a temperature sensor 17 are installed on the hot water tank 16, and a regulating valve is also installed. The temperature sensor 17 and the temperature automatic control instrument 18 are electrically connected, the regulating valve is electrically connected with the temperature automatic control instrument 18, and the temperature automatic control instrument 18 controls the temperature of the hot water tank 16 through the temperature sensor 17 and the regulating valve. The output end of the hot water tank 16 is connected with a hot water outlet pipe 22, the hot water outlet pipe 22 is connected with the input end of a circulating pump 23, the output end of the circulating pump 23 is connected with a hot water inlet pipe 24, the output end of the hot water inlet pipe 24 is connected with a second water inlet pipe 26 and a first water inlet pipe 25, the second water inlet pipe 26 is connected with the input end of the heat preservation heating disc 12, and the first water inlet pipe 25 is connected with the input end of the heating coil 11.

[0006] The first water return pipe 13, the second water return pipe 14, the first water inlet pipe 25, and the second water inlet pipe 26 are all provided with control valves.

[0007] A method for using a device for recovering diluent from diluent waste liquid, comprising the following working steps:

[0008] First step: adding the diluent waste liquid into a vacuum distillation tank, and vacuumizing the vacuum distillation tank to 3-15 KPa through a vacuum device;

[0009] Second step: when other production systems are producing, the steam condensate water produced by the other production systems is input into the heat preservation heating disc and the heating disc pipe through the first water inlet pipe and the second water inlet pipe to heat the vacuum distillation tank, and the hot water temperature is controlled to be between 80-100 DEG C;

[0010] Third step: when the other production systems are not producing, the steam heated hot water in the hot water tank is input into the heat preservation heating disc and the heating disc pipe to heat the vacuum distillation tank, and the hot water temperature is controlled through the temperature sensor, the temperature automatic control instrument and the adjusting valve, and the temperature is controlled to be between 80-100 DEG C;

[0011] Fourth step: the diluent waste liquid is distilled and recovered in the vacuum distillation tank, and the residual liquid with high solid content is intermittently discharged from the vacuum distillation tank.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] The present application realizes the recycling of the diluent. Specifically, the problem of easy high-temperature coking in the prior art is solved, the workload of cleaning the residues is reduced, the space for personnel operation is avoided to be limited, and the operation risk is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The present application is a plan view.

[0015] REFERENCE NUMERALS

[0016] 10, vacuum distillation tank; 11, heating disc pipe; 12, heat preservation heating disc; 13, first water return pipe; 14, second water return pipe; 15, condensate water return pipe; 16, hot water tank; 17, temperature sensor; 18, temperature automatic control instrument; 20, overflow pipe; 21, liquid level sensor; 22, hot water outlet pipe; 23, circulating pump; 24, hot water inlet pipe; 25, first water inlet pipe; 26, second water inlet pipe; 27, condensate water inlet pipe; 28, other production system. DETAILED DESCRIPTION

[0017] The specific embodiment of the present application will be further described in detail below in combination with the drawings.

[0018] As Figure 1As shown, a device for recovering diluent from diluent waste liquid, comprising a vacuum distillation tank 10 and a hot water tank 16; characterized in that a heating coil 11 is fixedly arranged in the cavity of the vacuum distillation tank 10, a heat preservation heating disc 12 is fixedly arranged on the outer wall of the vacuum distillation tank 10, a condensed water return main pipe 15 is connected to the input end of the hot water tank 16, a second return pipe 14 is connected between the output end of the heating coil 11 and the condensed water return main pipe 15, and a first return pipe 13 is connected between the output end of the heat preservation heating disc 12 and the condensed water return main pipe 15.

[0019] A temperature automatic control instrument 18 and a temperature sensor 17 are mounted on the hot water tank 16, the temperature sensor 17 and the temperature automatic control instrument 18 are electrically connected, a regulating valve is electrically connected with the temperature automatic control instrument 18, and the temperature automatic control instrument 18 controls the temperature of the hot water tank 16 through the temperature sensor 17 and the regulating valve; a hot water outlet pipe 22 is connected to the output end of the hot water tank 16, the hot water outlet pipe 22 is connected to the input end of a circulating pump 23, the output end of the circulating pump 23 is connected to a hot water supply main pipe 24, the output end of the hot water supply main pipe 24 is connected to a second water inlet pipe 26 and a first water inlet pipe 25, the second water inlet pipe 26 is connected to the input end of the heat preservation heating disc 12, and the first water inlet pipe 25 is connected to the input end of the heating coil 11.

[0020] Among them, control valves are arranged on the first return pipe 13, the second return pipe 14, the first water inlet pipe 25 and the second water inlet pipe 26.

[0021] A liquid level sensor 21 is further mounted on the hot water tank 16, and an overflow pipe 20 is further mounted on one side wall surface of the hot water tank 16. A condensed water supply pipe 27 is further connected to the hot water supply main pipe 24, and the condensed water supply pipe 27 is connected to other production systems 28. The temperature of the hot water in the hot water tank 16 is controlled at 80-100°C.

[0022] A method for using a device for recovering diluent from diluent waste liquid, comprising the following working steps:

[0023] First step: adding diluent waste liquid into the vacuum distillation tank 10, and vacuumizing the vacuum distillation tank 10 to 3-15 KPa through a vacuum device;

[0024] It is worth noting that the requirement for the vacuum device will be relatively high when the pressure is lower than 3 KPa, and the boiling point of the components will increase when the pressure is higher than 15 KPa, and the distillation effect will not be ideal;

[0025] Second step: when other production systems 28 are producing, the steam condensed water produced by the other production systems 28 is input into the heat preservation heating disc 12 and the heating coil 11 through the first water inlet pipe 25 and the second water inlet pipe 26 to heat the vacuum distillation tank 10, and the temperature of the hot water is controlled at 80-100°C.

[0026] Third step: when other production systems 28 do not produce, then the steam heated hot water in the hot water tank 16 is input into the heat preservation heating disc 12 and heating disc tube 11 through the circulating pump 23 to heat the vacuum distillation tank 10, and the hot water temperature is controlled through the temperature sensor 17, the temperature automatic control instrument 18 and the adjusting valve, and the temperature is controlled between 80-100 DEG C;

[0027] Fourth step: the diluent waste liquid is distilled and recovered in the vacuum distillation tank 10, and the residual liquid with high solid content is intermittently discharged from the vacuum distillation tank 10.

[0028] It is worth noting that the application is suitable for distillation of raw material components including propylene glycol methyl ether, propylene glycol methyl ether acetate, isopropyl alcohol and other solvents with boiling points lower than 150 DEG C.

[0029] Secondly, the application includes but is not limited to using rectification to produce condensed hot water and steam heated water, and other heat sources can also be selected, but the temperature of the heat source should be controlled below 100 DEG C of the vacuum distillation tank.

[0030] Secondly, the vacuum distillation tank 10 of the application is vacuumized by the vacuum equipment, and the distillation operation should be strictly controlled under the condition of vacuum 3-15 KPa, so as to ensure that the evaporation temperature of the organic solvent under the vacuum condition is not more than 80 DEG C. According to the actual boiling point of the production material under the vacuum condition, the hot water temperature can be appropriately reduced, and the control range can be 5-10 DEG C higher than the material.

[0031] The application provides a method for separating effective components of diluent from diluent organic waste, realizes the recycling of the diluent, and solves the problem of easy high-temperature coking in the prior art by using the steam high-temperature method, reduces the workload of cleaning residues, avoids the limitation of personnel operation space and the operation risk, and the like.

[0032] It can be understood that the application is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the application without departing from the spirit and scope of the application. Therefore, the application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the application belong to the scope protected by the application.

Claims

1. An apparatus for recovering diluent from diluent waste solution comprising a vacuum distillation tank (10) and a hot water tank (16); characterized in that, The heating coil (11) is fixedly arranged in the cavity of the vacuum distillation tank (10), the heat preservation heating disc (12) is fixedly arranged on the outer wall of the vacuum distillation tank (10), the input end of the hot water tank (16) is connected with the condensed water return pipe (15), the second return pipe (14) is connected between the output end of the heating coil (11) and the condensed water return pipe (15), and the first return pipe (13) is connected between the output end of the heat preservation heating disc (12) and the condensed water return pipe (15); The temperature automatic control instrument (18), the temperature sensor (17) and the adjusting valve are mounted on the hot water tank (16), the temperature sensor (17) and the temperature automatic control instrument (18) are electrically connected, the adjusting valve is electrically connected with the temperature automatic control instrument (18), and the temperature automatic control instrument (18) controls the temperature of the hot water tank (16) through the temperature sensor (17) and the adjusting valve; the output end of the hot water tank (16) is connected with the hot water outlet pipe (22), the hot water outlet pipe (22) is connected with the input end of the circulating pump (23), the output end of the circulating pump (23) is connected with the hot water inlet pipe (24), and the output end of the hot water inlet pipe (24) is connected with the second water inlet pipe (26) and the first water inlet pipe (25); the second water inlet pipe (26) is connected with the input end of the heat preservation heating disc (12), and the first water inlet pipe (25) is connected with the input end of the heating coil (11); The first return pipe (13), the second return pipe (14), the first water inlet pipe (25) and the second water inlet pipe (26) are all provided with control valves.

2. The apparatus for recovering diluent from diluent waste solution of claim 1, wherein, The liquid level sensor (21) is further mounted on the hot water tank (16), and the overflow pipe (20) is further mounted on the side wall surface of the hot water tank (16).

3. The apparatus for recovering diluent from diluent waste solution of claim 1, wherein, The hot water inlet pipe (27) is further connected to the hot water inlet pipe (24), and the hot water inlet pipe (27) is connected to other production systems (28).

4. The apparatus for recovering diluent from diluent waste solution of claim 1, wherein, The temperature of the hot water in the hot water tank (16) is controlled to be 80-100 DEG C.

5. A method of using a device for recovering diluent from a diluent waste stream, the method comprising: The working steps include the following steps: In the first step, the diluent waste liquid is added into the vacuum distillation tank (10), and the vacuum distillation tank (10) is vacuumized to 3-15 KPa; In the second step, when the other production systems (28) are produced, the steam condensed water produced by the other production systems (28) is input into the heat preservation heating disc (12) and the heating coil (11) through the first water inlet pipe (25) and the second water inlet pipe (26) to heat the vacuum distillation tank (10), and the temperature of the hot water is controlled to be 80-100 DEG C; In the third step, when the other production systems (28) are not produced, the steam heated hot water in the hot water tank (16) is input into the heat preservation heating disc (12) and the heating coil (11) through the circulating pump (23) to heat the vacuum distillation tank (10), and the temperature of the hot water is controlled by the temperature sensor (17), the temperature automatic control instrument (18) and the adjusting valve, and the temperature is controlled to be 80-100 DEG C; In the fourth step, the diluent waste liquid is distilled and recovered in the vacuum distillation tank (10), and the residual liquid with high solid content is intermittently discharged from the vacuum distillation tank (10).

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