Chlorinated paraffin falling film absorption oil removal system

Abstract

This invention provides a chlorinated paraffin falling film absorption oil removal system, comprising a falling film absorption tower and an oleic acid separation tank connected in sequence. A pipe at the bottom of the oleic acid separation tank connects to a hydrochloric acid tank, and an overflow port on the side of the oleic acid separation tank connects to a wax oil recovery tank via a pipe. The oleic acid separation tank is equipped with a remote level gauge to monitor the liquid level, and a liquid phase regulating valve at the bottom of the oleic acid separation tank controls the liquid level to 0.7-0.9m. The advantages of this invention are: it solves the systemic problem of light wax oil mixing with hydrochloric acid; by dynamically maintaining a specific liquid layer thickness, it utilizes the natural density difference of oleic acid to achieve stable enrichment of wax oil in the upper part of the separation tank; the innovative horizontal tank structure significantly extends the residence time of the mixed liquid, promoting the full upward aggregation of micron-sized wax oil droplets; and the overflow control mechanism located at a key position in the tank ensures timely recovery of the enriched wax oil, allowing the separated light wax to be directly reused in the main production system.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a chlorinated paraffin falling film absorption oil removal system. Background Technology

[0002] During the production of chlorinated paraffin, when the raw material liquid paraffin undergoes a substitution reaction with chlorine, some unreacted light liquid paraffin components, due to their low boiling point and high volatility, easily escape from the main reaction system along with the hydrogen chloride gas generated in the reaction, entering the subsequent tail gas treatment process. These unreacted light alkanes, when in contact with circulating cooling water in the falling film absorption tower, exhibit characteristics that make efficient separation difficult due to their unique physicochemical properties. The liquid light paraffin forms micron-sized oily aerosols within the absorption system, which cannot be completely captured by conventional condensation processes and are also difficult to dissolve effectively by the circulating acid, ultimately forming a stubborn oil-water emulsion system with hydrochloric acid.

[0003] The application of this type of waxy hydrochloric acid in steel pickling produces multiple negative effects: First, the oil film unevenly covers the steel surface, significantly reducing the contact area with the acid and causing a decrease in rust removal efficiency of more than 25%; second, the paraffin components volatilize in the hot environment of the pickling tank, forming harmful aerosols in the workshop, directly threatening the respiratory health of operators; more importantly, residual wax damages the crystalline structure of the metal surface, causing a sharp drop in coating adhesion of 30%-40% during subsequent phosphating treatment, significantly reducing the quality of anti-corrosion treatment. When this type of hydrochloric acid is used to prepare flocculants such as ferric chloride, the organic wax coating on the surface of the iron salt crystals significantly weakens their charge neutralization capacity, resulting in a decrease in the removal rate of suspended solids in wastewater treatment.

[0004] The release of waxy hydrochloric acid into the environment poses a deep ecological threat: the organic wax components released into the soil require 8-12 years to slowly degrade under the action of microorganisms, during which time they gradually penetrate into the topsoil to form a dense, hydrophobic layer. This process leads to the disintegration of soil aggregate structure, blockage of the original capillary system, and a sharp reduction in the soil's effective water retention capacity; root development is hindered in the hypoxic environment, typically manifested as a 42% reduction in root length and a 53% reduction in the number of fibrous roots in winter wheat compared to normal soil. Crops grown in contaminated soil not only have reduced biomass, but also show the presence of waxy degradation intermediates such as benzene series compounds. Tests have shown that the accumulation of naphthylpyrene in spinach is 7.8 times the normal value. Utility Model Content

[0005] In the production of chlorinated paraffin, when the raw material liquid paraffin undergoes a substitution reaction with chlorine, some of the unreacted light liquid paraffin components, due to their low boiling point and high volatility, are prone to forming wax-containing hydrochloric acid along with the hydrogen chloride gas generated in the reaction.

[0006] This utility model proposes a chlorinated paraffin falling film absorption oil removal system, comprising a falling film absorption tower and an oleic acid separation tank connected in sequence. The bottom of the oleic acid separation tank is connected to a hydrochloric acid tank via a pipeline. An overflow port is provided on the side of the oleic acid separation tank, and a pipeline from the overflow port is connected to a wax oil recovery tank. The oleic acid separation tank is equipped with a remote level gauge to monitor the liquid level. A liquid phase regulating valve is installed on the pipeline at the bottom of the oleic acid separation tank to control the liquid level in the oleic acid separation tank to be 0.7-0.9m.

[0007] As a preferred embodiment, the oleic acid separator is a horizontal tank.

[0008] As a preferred embodiment, an acid regulating valve is provided between the falling film absorption tower and the oleic acid separation tank.

[0009] As a preferred embodiment, a sight glass is provided on the side of the oleic acid separator to observe the liquid level.

[0010] As a preferred embodiment, the oleic acid separator is equipped with a sight glass for remote observation of the liquid level.

[0011] As a preferred embodiment, an overflow regulating valve is provided between the overflow port and the wax oil recovery tank.

[0012] As a preferred embodiment, the overflow outlet is located within the upper half of the height of the oleic acid separator.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention establishes a highly efficient and precise oleic acid separation and control system, solving the systemic problem of light wax oil mixing with hydrochloric acid. By dynamically maintaining a specific liquid layer thickness, the system utilizes the natural density difference of oleic acid to achieve stable enrichment of wax oil in the upper part of the separation tank. The innovative horizontal tank structure significantly extends the residence time of the mixture, promoting the full upward aggregation of micron-sized wax oil droplets. An overflow control mechanism located at a key position in the tank ensures timely recovery of the enriched wax oil, and the separated light wax can be directly reused in the main production system.

[0015] This effectively blocks the pathways for waxy oil pollutants to enter the soil and water cycle, preventing soil structure degradation and aquatic ecosystem damage, and significantly reducing environmental remediation costs. Ultimately, it achieves high-value recovery of waxy oil resources and simultaneous improvement in hydrochloric acid quality, establishing a dual guarantee mechanism for both production efficiency and ecological protection. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] The numbers in the attached diagram are:

[0019] 1-Falling film absorption tower, 2-Acid outlet regulating valve, 3-Oleic acid separation tank, 4-Sight glass, 5-Overflow port, 6-Remote level gauge, 7-Liquid phase regulating valve, 8-Hydrochloric acid tank, 9-Overflow regulating valve, 10-Wax oil recovery tank, 11-Sight glass monitoring. Detailed Implementation

[0020] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0021] Example:

[0022] Please see Figure 1 This utility model provides a chlorinated paraffin falling film absorption oil removal system, comprising the following core devices: a wax-containing hydrochloric acid mixture generated by the upstream falling film absorption tower 1 enters the core equipment oleic acid separation tank 3 through a pipeline, controlled by an acid outlet regulating valve 2 at a flow rate of 3.5 m³ / h. This embodiment adopts a horizontal tank body, acid-resistant material, and polished inner wall; a sight glass 4 for direct observation of the oleic acid interface and its matching sight glass monitoring system 11 are installed on the side wall of the oleic acid separation tank 3; a remote level gauge 6 for continuous monitoring of the total liquid level is installed in the oleic acid separation tank 3; an overflow port 5 for discharging light wax oil is provided at the upper centerline of the tank body; a liquid phase regulating valve 7 controlled by a liquid level signal is installed on the pipeline connecting the bottom outlet of the oleic acid separation tank 3 to the hydrochloric acid tank 8; and an overflow regulating valve 9 is installed on the pipeline connecting the overflow port 5 to the wax oil recovery tank 10.

[0023] During operation, the mixed liquid flows steadily into the oleic acid separator 3 via the acid outlet regulating valve 2 for gravity sedimentation separation. The remote level gauge 6 monitors the total liquid level in real time. When the liquid level deviates from the set value by 0.8m, the control system automatically adjusts the opening of the liquid phase regulating valve 7 to restore the liquid level to 0.8m within 20 seconds. At the same time, the hydrochloric acid at the bottom is delivered to the hydrochloric acid tank 8. When the wax oil layer accumulated in the upper part of the tank reaches a thickness of 12cm, the wax oil flows out from the overflow port 5 and is discharged into the wax oil recovery tank 10 under the control of the overflow regulating valve 9. The operator observes the oil-water interface and the transparency of the wax oil through the sight glass 4 or the sight glass monitoring system 11. After 72 hours of continuous operation, the test shows that the oil content in the acid delivered to the hydrochloric acid tank 8 is less than 80ppm, and the water content of the wax oil recovered to the wax oil recovery tank 10 is only 0.35%. The system operates stably and automatically throughout the entire process.

[0024] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A chlorinated paraffin falling film absorption oil removal system, characterized in that, The system includes a falling film absorption tower (1) and an oleic acid separation tank (3) connected in sequence. The bottom of the oleic acid separation tank (3) is connected to a hydrochloric acid tank (8). An overflow port (5) is provided on the side of the oleic acid separation tank (3). The overflow port (5) is connected to a wax oil recovery tank (10) through a pipe. The oleic acid separation tank (3) is equipped with a remote level gauge (6) to monitor the liquid level. A liquid phase regulating valve (7) is provided on the pipe at the bottom of the oleic acid separation tank (3) to control the liquid level in the oleic acid separation tank to be 0.7-0.9m.

2. The chlorinated paraffin falling film absorption oil removal system according to claim 1, characterized in that: The oleic acid separator (3) is a horizontal tank.

3. The chlorinated paraffin falling film absorption oil removal system according to claim 1, characterized in that: An acid regulating valve (2) is provided between the falling film absorption tower (1) and the oleic acid separation tank (3).

4. The chlorinated paraffin falling film absorption oil removal system according to claim 1, characterized in that: The oleic acid separator (3) is equipped with a sight glass (4) on the side to observe the liquid level.

5. The chlorinated paraffin falling film absorption oil removal system according to claim 1, characterized in that: The oleic acid separator (3) is equipped with a sight glass monitoring (11) to remotely observe the liquid level.

6. The chlorinated paraffin falling film absorption oil removal system according to claim 1, characterized in that: An overflow regulating valve (9) is provided between the overflow port (5) and the wax oil recovery tank (10).

7. The chlorinated paraffin falling film absorption oil removal system according to claim 1, characterized in that: The overflow port (5) is located in the upper half of the height range of the oleic acid separator (3).

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