CN-121990641-A - Adsorption tower for recycling organic ester in industrial wastewater and process method

Abstract

The invention relates to the technical field of adsorption separation, in particular to an adsorption tower for recycling organic ester in industrial wastewater and a process method. The device comprises a tower kettle (1), a stirring device (2), an adsorbent (3) and a communication device (4), wherein the stirring device (2) is arranged inside the tower kettle (1), the adsorbent (3) is fixedly arranged inside the tower kettle (1) and is positioned below the stirring device (2), and the communication device (4) is respectively arranged at the side part and the bottom of the tower kettle (1) and used for exchanging substances inside and outside the tower kettle. The number of the adsorption towers and the connection mode among the adsorption towers can be regulated and controlled in the whole process to meet different actual demands, a single-tower mode is suitable for intermittent operation, a double-tower serial mode and a three-tower serial mode are suitable for continuous operation, and the concentration of organic esters in the outlet waste liquid can be reduced to below 1000ppm in the three-tower serial operation mode.

Inventors

• ZHANG ZHANGUO
• LI KE
• ZHANG CHUANBAO
• XIA HONGMING
• LI JIE

Assignees

• 首建科技有限公司

Dates

Publication Date

20260508

Application Date

20260316

Claims (10)

1. 1. The adsorption tower for recycling the organic ester in the industrial wastewater is characterized by comprising a tower kettle (1), a stirring device (2), an adsorbent (3) and a communication device (4), wherein the stirring device (2) is arranged inside the tower kettle (1), the adsorbent (3) is fixedly arranged inside the tower kettle (1) and below the stirring device (2), and the communication device (4) is respectively arranged at the side part and the bottom of the tower kettle (1) and used for exchanging substances inside and outside the tower kettle.
2. 2. The adsorption tower for recycling organic esters in industrial wastewater according to claim 1, wherein the upper part and the lower part of the tower kettle (1) are of cylindrical structures, the middle part is of conical structures, the upper part, the middle part and the lower part are fixedly connected, and the communication device (4) is respectively arranged on the upper side wall, the lower side wall and the bottom of the tower kettle (1).
3. 3. The adsorption tower for recovering organic esters from industrial wastewater according to claim 2, wherein the ratio of the diameter of the upper part to the diameter of the lower part of the tower reactor (1) is 1.2-3, and the diameter of the lower part of the tower reactor (1) is 1-5cm.
4. 4. The adsorption tower for recycling organic esters in industrial wastewater according to claim 2, wherein the stirring device (2) comprises a stirring shaft (21) and stirring paddles (22), the stirring shaft (21) extends to the lower part of the tower kettle (1), and the stirring paddles (22) are arranged at intervals at the tail end of the stirring shaft (21).
5. 5. The adsorption tower for recovering organic esters from industrial wastewater according to claim 4, wherein the number of stirring paddles (22) is 2-5, and the distance between every two adjacent stirring paddles (22) is 30-60cm.
6. 6. A process for recycling organic ester in industrial wastewater by using the adsorption tower according to any one of claims 2-5 is characterized by comprising the steps of conveying the industrial wastewater into the tower kettle (1) from a communication device (4) at the bottom of the tower kettle (1) of the adsorption tower, starting a stirring device (2), adsorbing the industrial wastewater by an adsorbent (3), discharging the adsorbed wastewater from the communication device (4) at the lower side wall of the tower kettle (1), collecting the adsorbed wastewater by the adsorbent (3), discharging the industrial wastewater in the tower kettle (1) from the communication device (4) at the bottom of the tower kettle (1) after the adsorbent (3) is adsorbed and saturated, introducing steam into the tower kettle (1) through the communication device (4) at the bottom of the tower kettle (1), regenerating the adsorbent (3), and condensing and collecting a water-ester mixture from the communication device (4) arranged at the upper side wall of the tower kettle (1), and separating and recycling the water-ester mixture to obtain the organic ester.
7. 7. The process for recycling organic esters in industrial wastewater by using the adsorption tower according to claim 6, wherein the adsorption tower used in the process for recycling organic esters comprises a single adsorption tower or 2-5 adsorption towers connected in series.
8. 8. The process for recovering organic esters from industrial wastewater by using an adsorption tower according to claim 7, wherein the steam temperature is 100-110 ℃.
9. 9. The process for recycling organic esters in industrial wastewater by using the adsorption tower according to claim 7, wherein the pressure in the tower kettle (1) is 0.1-0.18MPa during the regeneration treatment.
10. 10. The process for recycling organic esters in industrial wastewater by an adsorption tower according to claim 7, wherein the regeneration treatment time is 65-240min.

Description

Adsorption tower for recycling organic ester in industrial wastewater and process method Technical Field The invention relates to the technical field of adsorption separation, in particular to an adsorption tower for recycling organic ester in industrial wastewater and a process method. Background Butyl acetate is used as an important chemical raw material, is widely applied to the fields of coating, printing, food and the like, is often used as an industrial solvent due to the good solubility of the butyl acetate to part of organic matters, and is more commonly used as an extractant in penicillin production. However, the emulsification phenomenon generated in the extraction process can lead to residual trace butyl acetate in the wastewater. Because the concentration of butyl acetate in the wastewater is extremely low, the traditional azeotropic distillation method is high in cost and easy to cause equipment corrosion, so that a novel recovery technology is needed. The Chinese patent No. 206660878U discloses a method for recovering organic ester in gas by using active carbon as adsorbent, which comprises the specific steps of introducing the gas containing organic ester into an active carbon filter through a draught fan until adsorption is saturated, transferring the adsorbed active carbon to a treatment tank, volatilizing the organic ester steam through a steam heating treatment tank, and finally introducing the organic ester steam into a condenser for condensation recovery. The method utilizes the abundant pore structure of the activated carbon, can effectively adsorb trace organic ester in gas, but has the problem of insufficient adsorption selectivity, so that the activated carbon is frequently regenerated, and the purity of the recovered product is difficult to ensure. The process of recovering organic ester with hydrocarbon extractant includes mixing liquid paraffin, high boiling point solvent oil, light diesel oil and heavy diesel oil as extractant in certain proportion, extracting with organic ester effluent, re-extracting layered organic phase with water solution containing organic ester, rectifying the repeatedly extracted organic phase to extract low boiling point organic ester component, and alkali washing to regenerate the extractant. Although the method has good use effect, the operation steps are complicated, and new waste water is generated in the alkaline washing regeneration process, so that the subsequent treatment burden is increased. Disclosure of Invention The invention provides an adsorption tower for recycling organic esters in industrial wastewater, which comprises a tower kettle, a stirring device, an adsorbent and a communication device, wherein the stirring device is arranged in the tower kettle, the adsorbent is fixedly arranged in the tower kettle and is positioned below the stirring device, and the communication device is respectively arranged at the side part and the bottom of the tower kettle and is used for exchanging substances in the tower kettle and outside the tower kettle. The upper part and the lower part of the tower kettle are of cylindrical structures, the middle part of the tower kettle is of a conical structure, the upper part, the middle part and the lower part of the tower kettle are fixedly connected, and the communication devices are respectively arranged on the upper side wall, the lower side wall and the bottom of the tower kettle. The diameter ratio of the upper part and the lower part of the tower kettle is (1.2-3) 1. Optionally, the diameter ratio of the upper part and the lower part of the tower kettle is (1.5-2) 1. The diameter of the cylinder at the lower part of the tower kettle is 1-5cm. Optionally, the diameter of the cylinder at the lower part of the tower kettle is 1-3cm. The stirring device comprises a stirring shaft and stirring paddles, wherein the stirring shaft extends to the lower part of the tower kettle, and the stirring paddles arranged at intervals are arranged at the tail end of the stirring shaft. The number of the stirring paddles is 2-5, wherein the distance between every two adjacent stirring paddles is 30-60cm. Optionally, the number of the stirring paddles is 2-3, wherein the distance between every two adjacent stirring paddles is 40-50cm. The adsorbent is organic or inorganic particles containing F, cl, br, I, -CHO, -NH 2、-NO2 polar functional groups, and the particle diameter is 0.5-2mm. The density of the adsorbent is 0.5-1.2g cm -3. The communication device at the bottom of the tower kettle is provided with a dispersion plate consisting of fine quartz sand, which can filter millimeter-level solid impurity particles and other viscous substances in raw material liquid, and is also provided with a high-pressure steam cleaning pipeline and a nozzle for reversely cleaning the dispersion plate. The invention provides a process method for recycling organic ester in industrial wastewater by using an adsorption tower, which comprises