Separation and purification device for waste solvent

Abstract

The utility model discloses a separation and purification device for a waste solvent, and belongs to the technical field of chemical engineering. The separation and purification device comprises an evaporator, the feeding end of the evaporator is used for inputting raw materials, the residue discharging end of the evaporator is provided with a residue collector, the evaporation discharging end of the evaporator is provided with a first rectifying tower through a connecting pipeline, the first rectifying tower is provided with a first finished product outlet, and materials at the first finished product outlet are subjected to aftertreatment; a first mother liquor outlet is further formed in the first rectifying tower, and a second rectifying tower is arranged on mother liquor of the first mother liquor outlet through a connecting pipeline. Through the separation and purification device, waste stripping liquid generated in the production process of liquid crystal panels can be treated and purified, particularly, the content of propylene glycol methyl ether acetate of a final product needs to be higher than 99%, the water content of propylene glycol methyl ether acetate is lower than 1%, the function can be effectively achieved through the separation and purification device, the production cost is reduced, and the production efficiency is improved. And environmental protection and subsequent waste liquid and waste residue treatment are facilitated.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a waste solvent separation and purification device. Background Art

[0002] In the field of chemical industry, separation and purification is a very common technical means, which mainly refers to separating impurities from a mixture to improve its purity. Purification, as an important chemical method, not only plays an important role in chemical research, but also plays a very important role in chemical production. Many important chemical research and chemical production are based on purification. In particular, separating new chemical raw materials from some waste liquids can avoid environmental pollution on the one hand, and reduce costs and increase the profits of chemical plants on the other hand.

[0003] However, the current problem with the purification of waste solvents is that the separation efficiency is low and the effect is poor, especially in the resolution of other organic impurity components, which cannot be well controlled. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a device for separating and purifying waste solvents.

[0005] The technical solution of the utility model is: a waste solvent separation and purification device, comprising:

[0006] An evaporator, wherein the feed end of the evaporator is provided with raw material input, a residue collector is arranged at the residue discharge end of the evaporator, a first distillation tower is arranged at the evaporation discharge end of the evaporator through a connecting pipeline, a first finished product outlet is arranged on the first distillation tower, and the material at the first finished product outlet is post-processed, a first mother liquor outlet is also arranged on the first distillation tower, and a second distillation tower is arranged for the mother liquor at the first mother liquor outlet through a connecting pipeline, a second finished product outlet is arranged on the second distillation tower, and the material at the second finished product outlet is post-processed, a second mother liquor outlet is also arranged on the second distillation tower, and the mother liquor at the second mother liquor outlet is collected.

[0007] Furthermore, the post-treatment includes: cooling or condensing. Generally speaking, the first finished product and the second finished product after being treated in the first distillation tower or the second distillation tower are in a gaseous state and need to be cooled or condensed before being collected.

[0008] Furthermore, the evaporator is a thin film evaporator or a distillation deslagging device.

[0009] Furthermore, the feed rate of the thin film evaporator is 1000-1200 liters per hour, the vacuum degree is 9KPa, the bottom temperature of the thin film evaporator is not higher than 90 degrees, the top temperature is not higher than 85 degrees, and the feed end is located at the top of the thin film evaporator. This feed position selection facilitates the rapid separation of the residue and effectively ensures the effect of subsequent distillation.

[0010] Furthermore, the thin film evaporator adopts intermittent slag removal, and the rate is 10 kg per hour.

[0011] Furthermore, the scraper speed of the thin film evaporator is 50-70 revolutions per minute.

[0012] Furthermore, the first finished product of the first distillation tower is a light component product, and the second finished product of the second distillation tower is a heavy component product;

[0013] The bottom temperature of the first distillation tower is not higher than 95 degrees, and the top temperature is not higher than 45 degrees;

[0014] The bottom temperature of the second distillation tower is not higher than 75 degrees, and the top temperature is not higher than 70 degrees. That is, by controlling the temperature, the first product is a light component product, and the second product is a heavy component product.

[0015] Furthermore, the feed position of the first distillation tower is in the middle, and the feed position of the second distillation tower is lower than the feed position of the first distillation tower.

[0016] Furthermore, the feed rate of the first distillation tower is 1050-1150 liters per hour, and the vacuum degree is 9 KPa.

[0017] Furthermore, the feed rate of the second distillation tower is 1000-1050 liters per hour, and the vacuum degree is 5 KPa.

[0018] Furthermore, the residue collector is a collection bucket. A professional chemical residue collector can also be used.

[0019] The beneficial technical effect of the utility model is that the waste stripping liquid generated in the production process of the liquid crystal panel can be treated and purified by the above-mentioned separation and purification device, especially the content of propylene glycol methyl ether acetate in the final product needs to be higher than 99%, and the water content is lower than 1%. The above-mentioned separation and purification device can effectively achieve this function, reduce production costs, and is beneficial to environmental protection and subsequent waste liquid and waste residue treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the use of the separation and purification device.

[0021] Figure 2 It is a schematic diagram of a separation and purification device in the prior art.

[0022] in:

[0023] 1. Evaporator, 11. Residue discharge end, 12. Evaporation discharge end,

[0024] 2. First distillation tower, 21. First finished product outlet, 22. First mother liquor outlet,

[0025] 3. The second distillation tower, 31. The second finished product outlet, 32. The second mother liquor outlet. DETAILED DESCRIPTION

[0026] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0027] See attached Figure 1-2 , a waste solvent separation and purification device of this embodiment includes:

[0028] An evaporator 1, wherein a feed end of the evaporator 1 is provided with raw materials, a residue collector is provided at a residue discharge end 11 of the evaporator 1, a first distillation tower 2 is provided at an evaporation discharge end 12 on the evaporator 1 through a connecting pipeline, a first finished product outlet 21 is provided on the first distillation tower 2, and the material at the first finished product outlet 21 is post-processed, a first mother liquor outlet 22 is also provided on the first distillation tower 2, and a second distillation tower 3 is provided for the mother liquor at the first mother liquor outlet 22 through a connecting pipeline, a second finished product outlet 31 is provided on the second distillation tower 3, and the material at the second finished product outlet 31 is post-processed, a second mother liquor outlet 32 ​​is also provided on the second distillation tower 3, and the mother liquor at the second mother liquor outlet 32 ​​is collected.

[0029] Furthermore, the post-treatment includes: cooling or condensing. Generally speaking, the first finished product and the second finished product after being treated by the first distillation tower 2 or the second distillation tower 3 are in a gaseous state and need to be cooled or condensed before being collected.

[0030] Furthermore, the evaporator 1 is a thin film evaporator or a distillation deslagging device.

[0031] Furthermore, the feed rate of the thin film evaporator is 1000-1200 liters per hour, the vacuum degree is 9KPa, the bottom temperature of the thin film evaporator is not higher than 90 degrees, the top temperature is not higher than 85 degrees, and the feed end is located at the top of the thin film evaporator. This feed position selection facilitates the rapid separation of the residue and effectively ensures the effect of subsequent distillation.

[0032] Furthermore, the thin film evaporator adopts intermittent slag removal, and the rate is 10 kg per hour.

[0033] Furthermore, the scraper speed of the thin film evaporator is 50-70 revolutions per minute.

[0034] Furthermore, the first finished product of the first distillation tower 2 is a light component product, and the second finished product of the second distillation tower 3 is a heavy component product;

[0035] The bottom temperature of the first distillation tower 2 is not higher than 95 degrees, and the top temperature is not higher than 45 degrees;

[0036] The bottom temperature of the second distillation tower 3 is not higher than 75 degrees, and the top temperature is not higher than 70 degrees. That is, by controlling the temperature, the first product is a light component product, and the second product is a heavy component product.

[0037] Furthermore, the feed position of the first distillation tower 2 is in the middle, and the feed position of the second distillation tower 3 is lower than the feed position of the first distillation tower 2 .

[0038] Furthermore, the feed rate of the first distillation tower 2 is 1050-1150 liters per hour, and the vacuum degree is 9 KPa.

[0039] Furthermore, the feed rate of the second distillation tower 3 is 1000-1050 liters per hour, and the vacuum degree is 5 KPa.

[0040] Furthermore, the residue collector is a collection bucket. A professional chemical residue collector can also be used.

[0041] The above-mentioned separation and purification device can be used to treat and purify the waste stripping liquid generated during the production process of the liquid crystal panel. In particular, the content of propylene glycol methyl ether acetate in the final product needs to be higher than 99%, and the water content needs to be lower than 1%. The above-mentioned separation and purification device can effectively achieve this function, reduce production costs, and is beneficial to environmental protection and subsequent waste liquid and waste residue treatment.

[0042] See attached Figure 2 As shown, this is a schematic diagram of a common separation and purification device.

[0043] First, the solid-liquid separation is carried out through the evaporator, the liquid component is converted into gas for evaporation, and then the evaporated gas is input into the distillation tower for separation to obtain the finished product and the mother liquor. Due to the limitation of the distillation temperature, the purity of the finished product is not high, and it is difficult to ensure the subsequent effective utilization. At the same time, there may be other products in the mother liquor that are higher than the distillation temperature, and these products will also affect the subsequent output.

[0044] Especially in the treatment of water-based stripping fluid for liquid crystal panel production, it is impossible to separate and purify its specific components. For LCD panel manufacturers, this conventional separation and purification cannot achieve the desired finished product quality, which increases the processing cost and makes it difficult to achieve the purpose of environmentally friendly emissions.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A waste solvent separation and purification device, characterized in that: include: An evaporator (1), wherein a feed end of the evaporator (1) is provided with a raw material input, a residue collector is provided at a residue discharge end (11) of the evaporator (1), a first distillation tower (2) is provided at the evaporation discharge end (12) of the evaporator (1) via a connecting pipeline, a first finished product outlet (21) is provided on the first distillation tower (2), and the material at the first finished product outlet (21) is post-processed, a first mother liquor outlet (22) is further provided on the first distillation tower (2), and a second distillation tower (3) is provided for the mother liquor at the first mother liquor outlet (22) via a connecting pipeline, a second finished product outlet (31) is provided on the second distillation tower (3), and the material at the second finished product outlet (31) is post-processed, a second mother liquor outlet (32) is further provided on the second distillation tower (3), and the mother liquor at the second mother liquor outlet (32) is collected; The feed position of the first distillation tower (2) is in the middle, and the feed position of the second distillation tower (3) is lower than the feed position of the first distillation tower (2).

2. The waste solvent separation and purification device according to claim 1, characterized in that: The post-treatment includes cooling or condensing.

3. The waste solvent separation and purification device according to claim 1, characterized in that: The evaporator (1) is a thin film evaporator or a distillation deslagging device.

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