BDO tar treatment system

Abstract

The utility model provides a BDO tar treatment system. The BDO tar treatment system comprises a tar storage tank, an acidification tank, a salting-out tank, a separation tank, a first desalting tank, a first filter and a rectification device which are sequentially connected in series, the first filter is also connected with a sodium sulfate storage tank; the acidification tank is also connected with a sulfuric acid storage tank; and the salting-out tank is also connected with a sodium sulfate storage tank. According to the system disclosed by the invention, the BDO tar is classified and respectively recovered through the matched use of the equipment, so that the recovery rate of each organic component in the BDO tar is improved, and the defect of resource waste caused by insufficient material recovery due to direct incineration treatment after simple distillation of the BDO tar in the existing way adopted for treating the BDO tar is overcome.

Description

Technical Field

[0001] The present application relates to the technical field of waste liquid recovery, and in particular to a BDO tar treatment system. Background Art

[0002] 1,4-Butanediol (BDO), also known as 1,4-dihydroxybutane and 1,4-butylene glycol, is an important fine chemical and organic raw material. It is widely used in the fields of medicine, papermaking, chemical industry and daily chemical industry. At present, the main production process of BDO is the improved Reppe method. Its simple process is: acetylene and formaldehyde with a mass concentration of 37% are sent to the butynediol reactor, and react under the catalyst Cu-Bi, 95°C and pressure. After filtration and separation, the butynediol aqueous solution is sent to a hydrogenation section, and the crude butanediol and hydrogen with a gauge pressure of 30MPa flow into the continuous fixed bed reactor, and the hydrogenation reaction is carried out under the catalyst Raney nickel and the temperature of 120-140°C to produce crude butanediol. BDO is then refined. During the refining process of BDO, salt, high-boiling point impurities and low-boiling point impurities are removed by distillation. The mixture of high-boiling point impurities and salt is usually called BDO distillation waste liquid. Due to its high viscosity, the waste liquid is also called BDO tar.

[0003] At present, most companies treat BDO tar by distilling to recover BDO and then incinerating the remaining components. However, BDO tar also contains recoverable components such as tetrahydrofuran, 1,4-butanediol, high-boiling fusel alcohols produced as side reactions, and organic acid salts. The above treatment method will result in insufficient material recovery and lead to waste of resources. Utility Model Content

[0004] The present application provides a BDO tar processing system to solve the problems in the above-mentioned background technology.

[0005] The present application provides a BDO tar processing system, comprising a tar storage tank, an acidification tank, a salting tank, a separation tank, a first desalting tank, a first filter and a distillation device connected in series in sequence;

[0006] The first filter is also connected to the sodium sulfate storage tank;

[0007] The acidification tank is also connected to the sulfuric acid storage tank;

[0008] The salting out tank is also connected to the sodium sulfate storage tank.

[0009] Optionally, the separation tank is also connected to the brine collection tank, the second desalination tank, the second filter and the solid material storage tank in sequence;

[0010] The second filter is also connected to the acidification tank.

[0011] Optionally, the distillation device comprises a distillation tower and a fraction collecting tank connected in series;

[0012] The distillation tower is also connected to the depolymerization kettle;

[0013] The depolymerization kettle is also connected to the acidification tank.

[0014] Optionally, the depolymerization kettle is also connected to an incinerator.

[0015] Optionally, an acidometer and a stirrer are provided in the acidification tank;

[0016] A dripping pipe is provided in the upper part of the acidification tank;

[0017] The dripping tube is connected to the sulfuric acid storage tank.

[0018] Optionally, the dripping pipe includes a main pipe and an annular branch pipe connected to the main pipe, and a plurality of dripping holes are formed on the lower surface of the annular branch pipe.

[0019] Optionally, the salting-out tank comprises a hydrothermal chamber surrounded by an outer shell and an inner tank sleeved in the hydrothermal chamber, the bottom of the inner tank is connected to a drain pipe, and the drain pipe passes through the outer shell and is connected to the separation tank;

[0020] An expansion section is provided on the upper part of the inner shell, the outer diameter of the expansion section is larger than the outer diameter of the outer shell, and the lower surface of the expansion section is movably connected to the top of the outer shell;

[0021] The connection between the expansion section and the shell is sealed by a sealing strip;

[0022] A water inlet is provided at the upper part of the shell, and a drain outlet is provided at the bottom;

[0023] An electric heater is arranged in the hydrothermal chamber.

[0024] The present application provides a BDO tar processing system, which is provided with an acidification tank to add water to the tar in the tar storage tank to prepare waste liquid, and then acidify it with sulfuric acid, convert the organic acid salt in the waste liquid into inorganic acid and enrich it in the water phase, and then transfer the acidified waste liquid to a salting-out tank, add sodium sulfate as a salting-out agent, extract the organic matter in the water phase into the oil phase, and reduce the amount of organic matter dissolved in the water phase, and then transfer the waste liquid after salting-out to a separation tank for oil-water separation, and the separated oil phase is cooled and desalted in a first desalting tank, and then filtered and separated by a first filter to obtain solid salt and filtrate, wherein the solid salt is recovered and reused in the salting-out process in the salting-out tank, and the filtrate is transferred to a distillation device to separate and recover the available components therein. The system of the present application classifies and recovers the BDO tar separately through the coordinated use of the above-mentioned equipment, thereby improving the recovery rate of each organic component in the BDO tar, and overcoming the disadvantages of the existing method of treating BDO tar, that is, simply distilling the BDO tar and then directly incinerating it, and insufficient material recovery leading to waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a BDO tar processing system provided in one embodiment of the present application;

[0027] Figure 2 A schematic diagram of a BDO tar processing system provided in accordance with another embodiment of the present application;

[0028] Figure 3 A schematic diagram of a BDO tar processing system provided in yet another embodiment of the present application;

[0029] Figure 4 A schematic diagram of the structure of an acidification tank provided in one embodiment of the present application;

[0030] Figure 5 A schematic diagram of the structure of a dropper provided in one embodiment of the present application;

[0031] Figure 6 A schematic diagram of the structure of a salting-out tank provided in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Tar storage tank; 2. Acidification tank; 3. Salting-out tank; 4. Separation tank; 5. First desalting tank; 6. First filter; 7. Distillation device; 8. Sodium sulfate storage tank; 9. Sulfuric acid storage tank; 10. Brine collecting tank; 11. Second desalting tank; 12. Second filter; 13. Solid storage tank; 14. Filtrate storage tank; 21. Acidity meter; 22. Agitator; 23. Dropper; 31. Outer shell; 32. Inner tank; 33. Sealing strip; 34. Electric heater; 71. Distillation tower; 72. Fraction collecting tank; 73. Depolymerization kettle; 74. Incinerator; 231. Main pipe; 232. Annular branch pipe; 301. Water inlet; 302. Drain outlet; 321. Drain pipe; 322. Expansion section. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0035] like Figure 1 As shown, the present application provides a BDO tar processing system, comprising a tar storage tank 1, an acidification tank 2, a salting tank 3, a separation tank 4, a first desalting tank 5, a first filter 6 and a distillation device 7 connected in series in sequence;

[0036] The first filter 6 is also connected to the sodium sulfate storage tank 8;

[0037] The acidification tank 2 is also connected to the sulfuric acid storage tank 9;

[0038] The salting-out tank 3 is also connected to the sodium sulfate storage tank 8 .

[0039] When in use, the BDO tar stored in the tar storage tank 1 is transferred to the acidification tank 2 through a corresponding liquid transfer pump, water (which can be tap water or factory washing wastewater. The volume ratio of water to BDO tar is 1:1-0.8) is added to the acidification tank 2, and concentrated sulfuric acid is added thereto through a sulfuric acid storage tank 9 to adjust the pH of the waste liquid in the acidification tank 2 to 2.5-3. At this time, since the waste liquid is in an acidic condition, the organic acid salt (mainly sodium formate) in the tar can be converted into the corresponding organic acid and sulfate.

[0040] The acidified waste liquid in the acidification tank 2 is transferred to the salting-out tank 3 through the corresponding acid-resistant liquid transfer pump, and the waste liquid temperature is heat-exchanged to 35-45°C. At the same time, stirring is started and sodium sulfate solid is added to the acidified waste liquid through the sodium sulfate storage tank 8 (the amount of sodium sulfate added is 0.3-0.4 times the weight of the waste liquid). After the sodium sulfate solid is completely dissolved (for example, stirring for 10-15 minutes after adding the sodium sulfate solid can be regarded as the sodium sulfate being completely dissolved), stirring and heating are stopped, and the salting-out waste liquid is allowed to stand for stratification, and the stratified salting-out waste liquid is discharged into the separation tank 4 for static stratification. In the above-mentioned salting-out process, the sulfuric acid added in the early stage converts the organic acid salt (mainly sodium formate) in the waste liquid into sodium sulfate inorganic salt, and the sodium sulfate hydrates the solvent water molecules, making the extractability and hydrophobicity of the waste liquid more obvious. When the salt and other reagents are added to a certain amount (0.3 to 0.4 times the mass of the waste liquid after acidification in this application), under certain conditions (35 to 45°C in this application), the organic matter in the waste liquid precipitates from the lower salt water phase into the upper organic phase, thereby achieving the purpose of separation and enrichment. The organic acid, 1,4-butanediol (i.e., BDO), ether oligomers, fusel alcohols, and polymers in the waste liquid become the oil phase and are enriched; while the sodium sulfate and solid residue are enriched in the water phase, thereby achieving the separation of the salt.

[0041] After the water and oil of the salting-out waste liquid are completely separated in the separation tank 4, the oil phase is transferred to the first desalting tank 5 and subjected to heat exchange and cooling (-5 to 0° C. in this application) so that the salt (mainly sodium sulfate) mixed in the oil phase is precipitated, and after filtering through the first filter 6 (such as a centrifugal filter, a vacuum filter or a filter press), the filtrate is transferred to the distillation device 7 for distillation to separate the recyclable fraction, and the filter cake, that is, the inorganic salt mainly composed of sodium sulfate, is transferred to the sodium sulfate storage tank 8 for reuse after drying.

[0042] The filtrate filtered by the first filter 6 is used in the distillation device 7 to recover the recyclable materials through fractionation.

[0043] The present application provides a BDO tar treatment system, which includes setting an acidification tank to add water to the tar in the tar storage tank to prepare waste liquid, and then using sulfuric acid for acidification, so that the organic acid salt in the waste liquid is converted into inorganic acid and enriched in the water phase, and then the acidified waste liquid is transferred to a salting-out tank, sodium sulfate is added as a salting-out agent, and the organic matter in the water phase is extracted into the oil phase, thereby reducing the amount of organic matter dissolved in the water phase, and then the waste liquid after salting-out is transferred to a separation tank for oil-water separation, and the separated oil phase is cooled and desalted in a first desalting tank, and then the waste liquid is passed through a separation tank. The solid salt and the filtrate are separated by filtering through the first filter 6, wherein the solid salt is recovered and reused in the salting out process in the salting out tank, and the filtrate is transferred to the distillation device to separate and recover the usable components therein. The system of the present application classifies and recovers the BDO tar separately through the coordinated use of the above-mentioned equipment, thereby improving the recovery rate of each organic component in the BDO tar, and overcoming the disadvantages of the existing method of treating BDO tar, that is, simply distilling the BDO tar and then directly incinerating it, resulting in insufficient material recovery and waste of resources.

[0044] like Figure 2 As shown, optionally, the separation tank 4 is also connected to the brine collection tank 10, the second desalination tank 11, the second filter 12 and the solid material storage tank 13 in sequence;

[0045] The second filter 12 is also connected to the acidification tank 2 .

[0046] In the present application, when in use, after the water and oil of the salting-out waste liquid are completely separated in the separation tank 4, the water phase is transferred to the brine collection tank 10 for temporary buffering, and then the brine in the brine collection tank 10 is transferred to the second desalting tank 11 for heat exchange cooling (for example, heat exchange to 0-5°C) so that the salt in the brine is fully precipitated. If necessary, part of the water can be heated and evaporated or a thickener can be used for concentration. After the salt is precipitated in the second desalting tank 11, the wastewater containing the crystallized salt is transferred to the second filter 12 (for example, a centrifugal filter, a vacuum filter or a filter press) for filtration, and the obtained filtrate is transferred to the acidification tank 2 for preparing the waste liquid, and the filter cake is collected in the solid material storage tank 13 for subsequent separation.

[0047] like Figure 3 As shown, optionally, the distillation device 7 includes a distillation tower 71 and a fraction collecting tank 72 connected in series;

[0048] The distillation tower 71 is also connected to the depolymerization kettle 73;

[0049] The depolymerization kettle 73 is also connected to the acidification tank 2 .

[0050] In the present application, when used, the filtrate after filtering by the first filter 6 first enters the distillation tower 71 to fractionate the components that can be evaporated according to their temperature, and different fractions are collected at the top of the tower and stored in different fraction collection tanks 72. If necessary, vacuum distillation can be used to recover organic matter in the waste liquid as much as possible. The high-boiling point bottom residue in the tower is mainly the polymer or high polymer produced in the process of producing BDO, such as ether compounds formed by dehydration between BDO or other fusel alcohols. The bottom residue is transferred to the depolymerization kettle 73, water and sulfuric acid are added, and heated to react, the polymer in the bottom residue is depolymerized, and the depolymerization reaction liquid after depolymerization is classified and recovered.

[0051] like Figure 3 As shown, optionally, the depolymerization kettle 73 is also connected to an incinerator 74 .

[0052] In the present application, after depolymerizing the kettle residue, the material obtained after the reaction is divided into three layers, the bottom is the reaction residue, the middle part is the water phase containing inorganic salts and organic salts, and the upper layer is the oil phase containing the depolymerization product (mainly alcohols, etc.), wherein the middle water phase and the upper oil phase both have recovery value, while the residue at the bottom has basically no recovery value, so it is input into the incinerator 74 for incineration for harmless treatment.

[0053] like Figure 4 As shown, optionally, an acidity meter 21 and a stirrer 22 are provided in the acidification tank 2;

[0054] A dripping pipe 23 is provided in the upper part of the acidification tank 2;

[0055] The dripping pipe 23 is connected to the sulfuric acid storage tank 9 .

[0056] In the present application, the dropper 23 can drip sulfuric acid into the waste liquid evenly to avoid excessive concentration of sulfuric acid in some parts, which may affect the measurement result of the acidity meter 21. The stirrer 22 is used to stir the sulfuric acid and the waste liquid to make them evenly mixed.

[0057] The acidity meter 21 monitors the pH value of the waste liquid in the acidification tank 2 in real time. When the pH value of the waste liquid in the acidification tank 2 is adjusted to 2.5-3, the addition of sulfuric acid is stopped, and the waste liquid is stirred for 5-10 minutes. At this time, since the waste liquid is in an acidic condition, the organic acid salt (mainly sodium formate) in the tar can be converted into the corresponding organic acid and sulfate.

[0058] like Figure 5 As shown, optionally, the dripping pipe 23 includes a main pipe 231 and an annular branch pipe 232 connected to the main pipe 231 , and a plurality of dripping holes are formed on the lower surface of the annular branch pipe 232 .

[0059] In the present application, when in use, concentrated sulfuric acid is added thereto through the sulfuric acid storage tank 9, the added concentrated sulfuric acid enters the annular branch pipe 232 through the main pipe of the dripping pipe 23, and then drips into the waste liquid evenly from the dripping holes on the lower surface of the annular branch pipe 232.

[0060] like Figure 6 As shown, optionally, the salting-out tank 3 includes a hydrothermal chamber surrounded by a shell 31 and an inner tank 32 sleeved in the hydrothermal chamber, the bottom of the inner tank 32 is connected to a drain pipe 321, and the drain pipe 321 passes through the shell 31 and is connected to the separation tank 4;

[0061] An expansion section 322 is provided on the upper part of the inner liner 32. The outer diameter of the expansion section 322 is larger than the outer diameter of the outer shell 31. The lower surface of the expansion section 322 is movably connected to the top of the outer shell 31.

[0062] The connection between the expansion section 322 and the housing 31 is sealed by a sealing strip 33;

[0063] The housing 31 has a water inlet 301 at the top and a drain outlet 302 at the bottom.

[0064] An electric heater 34 is provided in the hydrothermal chamber.

[0065] In the present application, when in use, the acidified waste liquid is transferred into the inner tank 32 of the salting-out tank 3 through the corresponding acid-resistant liquid transfer pump, and after water is added to the hydrothermal chamber through the water inlet 301, the electric heater 34 is turned on for heating, and the temperature of the waste liquid in the inner tank 32 is heat-exchanged to 35-45°C, and stirring is turned on at the same time, and sodium sulfate solid is added to the acidified waste liquid in the inner tank through the sodium sulfate storage tank 8 (the amount of sodium sulfate added is 0.3-0.4 times the weight of the waste liquid), and after the sodium sulfate solid is completely dissolved (for example, stirring for 10-15 minutes after adding the sodium sulfate solid can be regarded as the sodium sulfate being completely dissolved), stirring and heating are stopped (the electric heater 34 can be turned off), and the salting-out waste liquid is allowed to stand for stratification, and after stratification, the salting-out waste liquid in the inner tank 32 is discharged into the separation tank 4 through the drain pipe 321 for static stratification.

[0066] A BDO tar processing system, the working process of which is as follows:

[0067] When in use, the BDO tar stored in the tar storage tank 1 is transferred to the acidification tank 2 through the corresponding liquid transfer pump, water (which can be tap water or factory washing wastewater. The volume ratio of water to BDO tar is 1:1-0.8) is added to the acidification tank 2, and concentrated sulfuric acid is added thereto through the sulfuric acid storage tank 9. The added concentrated sulfuric acid enters the annular branch pipe 232 through the main pipe of the dripping pipe 23, and then drips into the waste liquid evenly from the dripping hole on the lower surface of the annular branch pipe 232. At the same time, the stirrer 22 is turned on to stir the acidification tank 2, and the pH value of the waste liquid in the acidification tank 2 is monitored in real time through the acidometer 21. When the pH of the waste liquid in the acidification tank 2 is adjusted to 2.5-3, the addition of sulfuric acid is stopped, and the waste liquid is stirred for 5-10 minutes. At this time, since the waste liquid is in an acidic condition, the organic acid salt (mainly sodium formate) in the tar can be converted into the corresponding organic acid and sulfate.

[0068] The acidified waste liquid in the acidification tank 2 is transferred into the inner tank 32 of the salting-out tank 3 through the corresponding acid-resistant liquid transfer pump. After adding water into the hydrothermal chamber through the water inlet 301, the electric heater 34 is turned on for heating, and the temperature of the waste liquid in the inner tank 32 is heat-exchanged to 35-45° C. At the same time, stirring is turned on and sodium sulfate solid is added to the acidified waste liquid in the inner tank through the sodium sulfate storage tank 8 (the amount of sodium sulfate added is 0.3-0.4 times the weight of the waste liquid). After the sodium sulfate solid is completely dissolved (for example, stirring for 10-15 minutes after adding the sodium sulfate solid can be regarded as the sodium sulfate being completely dissolved), stirring and heating are stopped (the electric heater 34 can be turned off), and the salting-out waste liquid is allowed to stand for stratification. After stratification, the salting-out waste liquid in the inner tank 32 is discharged into the separation tank 4 through the drain pipe 321 for stratification. In the above-mentioned salting-out process, the sulfuric acid added in the early stage converts the organic acid salt (mainly sodium formate) in the waste liquid into sodium sulfate inorganic salt, and the sodium sulfate hydrates the solvent water molecules, making the waste liquid extractable and hydrophobic characteristics more obvious. When the salt and other reagents are added to a certain amount (0.3 to 0.4 times the mass of the waste liquid after acidification in this application), under certain conditions (35 to 45°C in this application), the organic matter in the waste liquid precipitates from the lower salt water phase into the upper organic phase, thereby achieving the purpose of separation and enrichment, and the organic acid, 1,4-butanediol (i.e., BDO), ether oligomers, fusel alcohols, and polymers in the waste liquid become the oil phase and are enriched; while the sodium sulfate and solid residue are enriched in the water phase, thereby achieving the separation of salt.

[0069] After the water and oil of the salting-out waste liquid are completely separated in the separation tank 4, the oil phase is transferred to the first desalting tank 5 and subjected to heat exchange and cooling (-5 to 0° C. in this application) so that the salt (mainly sodium sulfate) mixed in the oil phase is precipitated. After being filtered by the first filter 6, the filtrate is transferred to the distillation device 7 for distillation to separate the recyclable fraction, and the filter cake, i.e., the inorganic salt mainly composed of sodium sulfate, is transferred to the sodium sulfate storage tank 8 for reuse after drying.

[0070] When the filtrate filtered by the first filter 6 is processed in the distillation device 7, it first enters the distillation tower 71 to fractionate the components that can be evaporated according to their temperature, and collects different fractions at the top of the tower and stores them in different fraction collection tanks 72. If necessary, vacuum distillation can be used to recover organic matter in the waste liquid as much as possible. The high-boiling point bottom residue of the tower is mainly the polymer or high polymer produced in the production process of BDO, such as ether compounds formed by dehydration between BDO or other fusel alcohols. The bottom residue is transferred to the depolymerization kettle 73, water and sulfuric acid are added, and heated to react, and the polymer in the bottom residue is depolymerized. The material obtained after the reaction is divided into three layers, the bottom is the reaction residue, the middle part is the water phase containing inorganic salts and organic salts, and the upper layer is the oil phase containing depolymerization products (mainly alcohols, etc.). The reaction residue is sent to the incinerator 74 for incineration and harmless treatment, and the water phase and oil phase are sent to the acidification tank 2 for mixing waste liquid, and finally the fraction is recovered through fractionation.

[0071] After the water and oil in the salting-out waste liquid are completely separated in the separation tank 4, the water phase is transferred to the brine collection tank 10 for temporary buffer storage, and then the brine in the brine collection tank 10 is transferred to the second desalting tank 11 for heat exchange cooling (for example, heat exchange to 0-5°C) to allow the salt in the brine to be fully precipitated. If necessary, part of the water can be heated and evaporated or a thickener can be used for concentration. After the salt is precipitated in the second desalting tank 11, the wastewater containing the crystallized salt is transferred to the second filter 12 for filtration, and the obtained filtrate is transferred to the acidification tank 2 for preparation of waste liquid, and the filter cake is collected in the solid storage tank 13 for subsequent separation.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A BDO tar processing system, characterized in that: It comprises a tar storage tank (1), an acidification tank (2), a salting tank (3), a separation tank (4), a first desalting tank (5), a first filter (6) and a distillation device (7) which are sequentially connected in series; The first filter (6) is also connected to a sodium sulfate storage tank (8); The acidification tank (2) is also connected to a sulfuric acid storage tank (9); The salting-out tank (3) is also connected to the sodium sulfate storage tank (8).

2. The BDO tar processing system according to claim 1, characterized in that: The separation tank (4) is also connected in sequence to the brine collection tank (10), the second desalination tank (11), the second filter (12) and the solid material storage tank (13); The second filter (12) is also connected to the acidification tank (2).

3. The BDO tar processing system according to claim 1, characterized in that: The distillation device (7) comprises a distillation tower (71) and a fraction collecting tank (72) which are sequentially connected in series; The distillation tower (71) is also connected to the depolymerization kettle (73); The depolymerization kettle (73) is also connected to the acidification tank (2).

4. The BDO tar processing system according to claim 3, characterized in that: The depolymerization kettle (73) is also connected to an incinerator (74).

5. The BDO tar processing system according to claim 1, characterized in that: The acidification tank (2) is provided with an acidity meter (21) and a stirrer (22); A dripping pipe (23) is provided at the upper inner portion of the acidification tank (2); The dripping pipe (23) is connected to the sulfuric acid storage tank (9).

6. The BDO tar processing system according to claim 5, characterized in that: The dripping pipe (23) comprises a main pipe (231) and an annular branch pipe (232) connected to the main pipe (231), and a plurality of dripping holes are formed on the lower surface of the annular branch pipe (232).

7. The BDO tar processing system according to any one of claims 1 to 6, characterized in that: The salting-out tank (3) comprises a hydrothermal chamber surrounded by an outer shell (31) and an inner tank (32) sleeved in the hydrothermal chamber, the bottom of the inner tank (32) is connected to a drain pipe (321), and the drain pipe (321) passes through the outer shell (31) and is connected to a separation tank (4); An expansion section (322) is provided on the upper part of the inner liner (32), the outer diameter of the expansion section (322) is greater than the outer diameter of the outer shell (31), and the lower surface of the expansion section (322) is movably connected to the top of the outer shell (31); The connection between the expansion section (322) and the housing (31) is sealed by a sealing strip (33); The housing (31) has a water inlet (301) at the top and a water outlet (302) at the bottom; An electric heater (34) is arranged in the hydrothermal chamber.

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