CN110963540A - Carbon black water degassing and deodorizing method - Google Patents
Carbon black water degassing and deodorizing method Download PDFInfo
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- CN110963540A CN110963540A CN201811011855.9A CN201811011855A CN110963540A CN 110963540 A CN110963540 A CN 110963540A CN 201811011855 A CN201811011855 A CN 201811011855A CN 110963540 A CN110963540 A CN 110963540A
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- carbon black
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- black water
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- acetylene
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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Abstract
The invention belongs to the technical field of separation by using a method for reducing partial pressure of certain components in a gas phase, and particularly relates to a carbon black water degassing and deodorizing method, which comprises the following steps: sending the carbon black water into the middle upper part in a vacuum stripping tower for spraying, entering stripping gas from the bottom of the stripping tower, making the stripping gas in countercurrent contact with the sprayed carbon black water, discharging the rest stripping tail gas from the top of the stripping tower, pumping the stripping tail gas to a cracking gas main pipe for preparing acetylene from natural gas by a vacuum pump, recovering acetylene gas, discharging the degassed carbon black water from the bottom of the stripping tower, and sending the carbon black water to a carbon black water open type separation tank for subsequent treatment. The method has high degassing rate to carbon black water and high removal rate to acetylene and diacetylene; the emission of malodorous gas in the subsequent treatment process of the carbon black water is greatly reduced; meanwhile, the organic gas in the carbon black removing water is removed and recovered, so that the acetylene loss is reduced, the economic benefit is increased, and potential safety hazards do not exist.
Description
Technical Field
The invention belongs to the technical field of separation by using a method for reducing partial pressure of certain components in a gas phase, and particularly relates to a carbon black water degassing and deodorizing method.
Background
The main process system for preparing acetylene by partial oxidation of natural gas comprises a pyrolysis gas generation process, a pyrolysis gas compression process, an acetylene concentration process, a solvent regeneration process and an auxiliary system, wherein the auxiliary system comprises a carbon black separation unit, a gas holder and the like (comparison of technologies for preparing acetylene by partial oxidation of natural gas, Weekly dry and the like, natural gas chemical industry, No. 36 No. 2 of 2011, No. 40 left column No. 2, published 2011 No. 12 and 31). The carbon black water coming out of the acetylene furnace, the electric filter and the cooling tower in the cracking procedure enters the degassing tank through the carbon black water main pipe and then enters the carbon black separation tank, and after carbon black in the carbon black water is removed in a physical sedimentation mode, the carbon black water is recycled. Because part of the pyrolysis gas is carried and dissolved in the carbon black water, and the carbon black separation tank is an open type device, in the operation process, the carried and dissolved organic gas can be volatilized, which is not beneficial to the health of operators and also does not meet the increasingly strict emission requirement of Volatile Organic Compounds (VOC). It has been reported in the literature that carbon black water contains volatile alkynes, aromatic hydrocarbon substances, benzene-toluene-xylene, and the like, which are VOC gases having a foul odor (US9290384B2), and thus VOC in carbon black water is removed to reduce the foul odor.
In order to solve the above technical problems, U.S. Pat. No. US9290384B2 discloses a carbon black water degassing process in which a closed separation tank is used to collect volatilized gas in carbon black water and then the gas is transferred out, and in order to further remove the gas in the carbon black water, a part of the carbon black water is transferred to a vacuum flash tank for degassing. By adopting the method, 99 vol% of organic gas in the carbon black water can be removed, but the closed separation tank adopted by the process has certain potential safety hazard, and if the operation is not proper, the enriched organic combustible gas can explode.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for degassing and deodorizing carbon black water, which has no potential safety hazard.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the carbon black water degassing and deodorizing method comprises the following steps: sending the carbon black water into the middle upper part in a stripping tower for spraying, entering stripping gas from the bottom of the stripping tower, and making the stripping gas be in countercurrent contact with the sprayed carbon black water, discharging the rest stripping gas tail gas from the top of the stripping tower, pumping the stripping gas tail gas to a cracking gas main pipe for preparing acetylene from natural gas by a vacuum pump, recovering acetylene gas, discharging the degassed carbon black water from the bottom of the stripping tower, and sending the carbon black water to a carbon black water open type separation tank for subsequent treatment.
The method has high degassing rate on the carbon black water and high removal rate on acetylene and diacetylene, greatly reduces the emission of foul gas in the subsequent treatment process of the carbon black water, simultaneously removes and recovers the organic gas in the carbon black removing water, reduces acetylene loss, increases economic benefits and has no potential safety hazard.
Further, the carbon black water is pumped into the middle upper part of the stripping tower by a booster pump to be sprayed.
The mid-upper portion is a clear concept to those of ordinary skill in the art.
The inlet of the carbon black water booster pump is connected with the carbon black water main pipe of the acetylene device through a pipeline, the outlet of the carbon black water booster pump is connected with the middle upper part of the stripping tower through a pipeline, and carbon black water is introduced into the stripping tower from the carbon black water main pipe. And a stripping gas tail gas pipeline at the top of the stripping tower is connected with an inlet of the vacuum pump. The outlet of the vacuum pump is connected with a cracking gas main pipe of the production device and is provided with a circulating pipeline. The lower section of the stripping tower is provided with a stripping gas pipeline which can be filled with the required stripping gas. The pipeline at the bottom of the stripping tower is connected with an open type carbon black tank through a carbon black water delivery pump. Regulating valves are respectively arranged on a pipeline from the stripping gas to the stripping tower, a pipeline from the carbon black water booster pump to the stripping tower, a pipeline from the carbon black water delivery pump to the open type carbon black water tank, a pipeline from the top of the stripping tower to the vacuum pump inlet and a return pipeline from the vacuum pump outlet. A pressure gauge and a thermometer are arranged at the top of the stripping tower.
Further, acetylene gas is recovered by a concentration system.
Further, the stripping gas is one or more of nitrogen, natural gas or acetylene tail gas, and the volume content of alkyne in the natural gas or acetylene tail gas is less than 0.05%.
The acetylene tail gas is a tail gas generated in the process of preparing acetylene, for example, a large amount of tail gas generated in the process of producing acetylene by using natural gas as a raw material, and the main components of the tail gas are carbon monoxide and hydrogen (the first exploration for preparing ethylene glycol by using the acetylene tail gas, such as chenshiliu, etc., petrochemical industry, volume 41 supplement in 2012, page 402, left column, section 1).
Further, the stripping gas is acetylene tail gas with alkyne volume content less than 0.05%.
Further, under the standard state, the volume ratio of the stripping gas to the carbon black water is 1-4.
Further, under the standard state, the volume ratio of the stripping gas to the carbon black water is 2.
Further, the absolute pressure of the system is 10-80 kPa.
Further, the absolute pressure of the system is 40-60 kPa.
The invention has the beneficial effects that:
the method has high degassing rate of 94.9-99.0 percent for carbon black water, high removal rate of acetylene and diacetylene, 99.8-99.9 percent for acetylene and 59.6-92.4 percent for diacetylene; the emission of the foul gas in the subsequent treatment process of the carbon black water is greatly reduced, and meanwhile, the organic gas in the carbon black removing water is removed and recovered, so that the acetylene loss is reduced, the economic benefit is increased, and no potential safety hazard exists.
Drawings
Fig. 1 is a schematic structural diagram of a carbon black water degassing and deodorizing process matching device of the present invention, wherein 1 is a stripping tower, 2 is a carbon black water booster pump, 3 is a carbon black water delivery pump, 4 is a vacuum pump, 5-9 are all regulating valves, 10 is a pressure gauge, 11 is a thermometer, and 12 is a regulating valve.
Detailed Description
The examples are provided for better illustration of the present invention, but the present invention is not limited to the examples. Therefore, those skilled in the art should make insubstantial modifications and adaptations to the embodiments of the present invention in light of the above teachings and remain within the scope of the invention.
Example 1
The carbon black water is treated according to the device shown in figure 1 and the following method, which comprises the following steps:
300Nm3Feeding carbon black water to be treated into a stripping tower through a booster pump, spraying the middle upper part of the stripping tower, taking acetylene tail gas (the volume content of total alkyne in stripping gas is 0.04%) as stripping gas, wherein the volume ratio of the acetylene tail gas to the carbon black water is 1.2:1, the absolute pressure of the stripping gas is 60kPa, feeding the stripping gas from the bottom of the stripping tower, carrying out countercurrent contact with the sprayed carbon black water, discharging the rest of the stripping gas tail gas from the top of the stripping tower, feeding the rest of the stripping gas tail gas into a vacuum pump system, pumping the rest of the stripping gas tail gas into a cracking gas main pipe for preparing acetylene from natural gas through a vacuum pump, feeding the stripping gas into a concentration system to recover the acetylene gas, discharging the degassed carbon black water from the bottom of the stripping tower, and feeding the carbon black water into a carbon black;
an inlet of the carbon black water booster pump 2 is connected with a carbon black water main pipe of the acetylene device through a pipeline, an outlet of the carbon black water booster pump 2 is connected with the middle upper part of the stripping tower 1 through a pipeline, and carbon black water is introduced into the stripping tower 1 from the carbon black water main pipe; a stripping gas tail gas pipeline at the top of the stripping tower 1 is connected with an inlet of a vacuum pump 4; the outlet of the vacuum pump 4 is connected with a cracked gas main pipe of the production device and is provided with a circulating pipeline; a stripping gas pipeline is arranged at the lower section of the stripping tower 1, and required stripping gas can be introduced; the line at the bottom of stripping column 1 is connected to an open-type carbon black tank via carbon black water feed pump 3. The pipeline from the stripping gas to the stripping tower, the pipeline from the carbon black water booster pump 2 to the stripping tower 1, the pipeline from the carbon black water delivery pump 3 to the open type carbon black water tank, the pipeline from the top of the stripping tower to the vacuum pump inlet and the vacuum pump outlet return pipeline are respectively provided with an adjusting valve 5, an adjusting valve 6, an adjusting valve 7, an adjusting valve 8, an adjusting valve 9 and an adjusting valve 12, and the top of the stripping tower 1 is also provided with a pressure gauge 10 and a thermometer 11.
Examples 2 to 10 and comparative examples 1 to 4
Examples 2 to 10 and comparative examples 1 to 4 were carried out under the conditions shown in Table 1, and the other steps were the same as in example 1.
TABLE 1 EXAMPLES 2-10 AND COMPARATIVE EXAMPLES 1-4
The total amount of gas, acetylene content and diacetylene content in the carbon black water before and after treatment by the methods described in examples 1-10 and comparative examples 1-4 were determined and calculated according to the formula: the degassing rate (total amount of gas in undegassed carbon black water-total amount of gas in degassed carbon black water)/total amount of gas in undegassed carbon black water × 100%, and the acetylene removal rate (total amount of acetylene in undegassed carbon black water-total amount of acetylene in degassed carbon black water)/total amount of acetylene in undegassed carbon black water × 100%; the diacetylene removal rate (total amount of diacetylene in undegassed carbon black water-total amount of diacetylene in degassed carbon black water)/total amount of diacetylene in undegassed carbon black water × 100%, and the carbon black water degassing rate, acetylene removal rate and diacetylene removal rate were calculated. The results are shown in Table 2.
TABLE 2 test results
| Carbon black water degassing Rate/%) | Acetylene removal rate/%) | Diacetylene removal rate/% | |
| Example 1 | 94.9 | 99.8 | 59.6 |
| Example 2 | 98.6 | 99.8 | 85.1 |
| Example 3 | 97.6 | 99.8 | 81.1 |
| Example 4 | 97.5 | 99.9 | 81.1 |
| Example 5 | 97.5 | 99.9 | 81.1 |
| Example 6 | 99.0 | 99.9 | 92.4 |
| Example 7 | 97.0 | 99.7 | 78.0 |
| Example 8 | 97.8 | 99.9 | 83.0 |
| Example 9 | 95.7 | 99.9 | 65.9 |
| Example 10 | 97.1 | 99.7 | 79.0 |
| Comparative example 1 | 89.2 | 99.8 | 16.6 |
| Comparative example 2 | 89.7 | 99.9 | 19.2 |
| Comparative example 3 | 89.3 | 99.5 | 19.1 |
| Comparative example 4 | 81 | 92.0 | 4.8 |
As is clear from Table 2, the removal rate of diacetylene from carbon black water treated by the methods described in examples 1 to 10 was significantly improved as compared with those of comparative examples 1 to 4. Therefore, the method provided by the invention can obviously improve the carbon black water degassing rate, the acetylene removal rate and the diacetylene removal rate.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The carbon black water degassing and deodorizing method is characterized by comprising the following steps: sending the carbon black water into the middle upper part in a vacuum stripping tower for spraying, entering stripping gas from the bottom of the stripping tower to be in countercurrent contact with the sprayed carbon black water, discharging the rest stripping gas tail gas from the top of the stripping tower to enter a vacuum pump system, pumping the stripping gas tail gas into a cracking gas main pipe for preparing acetylene from natural gas by a vacuum pump, recovering acetylene gas, discharging the degassed carbon black water from the bottom of the stripping tower, and sending the carbon black water to a carbon black water open type separation tank for subsequent treatment.
2. The method as claimed in claim 1, wherein the carbon black water is pumped into the middle upper part of the stripper column through a booster pump to be sprayed.
3. The method of claim 1 or 2, wherein the acetylene gas is recovered from the stripping gas by a concentration system.
4. The method of claim 1, 2 or 3, wherein the stripping gas is one or more of steam, nitrogen, natural gas or acetylene tail gas, and the volume content of alkyne in the natural gas or acetylene tail gas is less than 0.05%.
5. The method of claim 4, wherein the stripping gas is acetylene off-gas having an alkyne volume content of < 0.05%.
6. The method of claim 1, 2, 3, 4 or 5, wherein the volume ratio of the stripping gas to the carbon black water is 1-4 under standard conditions.
7. The method of claim 6, wherein the stripping gas to carbon black water volume ratio is 2 under standard conditions.
8. The method of claim 1, 2, 3, 4, 5, 6 or 7, wherein the system absolute pressure is 10 to 80 kPa.
9. The method of claim 8, wherein the system absolute pressure is 40 to 60 kPa.
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| CN201811011855.9A CN110963540A (en) | 2018-09-30 | 2018-09-30 | Carbon black water degassing and deodorizing method |
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| CN201811011855.9A CN110963540A (en) | 2018-09-30 | 2018-09-30 | Carbon black water degassing and deodorizing method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6024937A (en) * | 1983-07-21 | 1985-02-07 | Matsushita Electric Ind Co Ltd | Manufacture of disc-shaped recording medium |
| CN1133865A (en) * | 1994-11-19 | 1996-10-23 | 龚永模 | Process flow and apparatus for direct production of dry carbon black from gasificating water washing carbon black water by separating |
| CN102241421A (en) * | 2010-05-14 | 2011-11-16 | 中国石油化工集团公司 | Method for removing dissolved gases from carbon black water |
| CN103342399A (en) * | 2013-08-01 | 2013-10-09 | 新疆中泰化学股份有限公司 | Stripping system and stripping method for cleaning waste sodium hypochlorite in production of acetylene by virtue of calcium carbide method |
| CN105731714A (en) * | 2014-12-06 | 2016-07-06 | 哈尔滨金大环境工程有限公司 | Wastewater treatment apparatus and treatment method thereof |
-
2018
- 2018-09-30 CN CN201811011855.9A patent/CN110963540A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6024937A (en) * | 1983-07-21 | 1985-02-07 | Matsushita Electric Ind Co Ltd | Manufacture of disc-shaped recording medium |
| CN1133865A (en) * | 1994-11-19 | 1996-10-23 | 龚永模 | Process flow and apparatus for direct production of dry carbon black from gasificating water washing carbon black water by separating |
| CN102241421A (en) * | 2010-05-14 | 2011-11-16 | 中国石油化工集团公司 | Method for removing dissolved gases from carbon black water |
| CN103342399A (en) * | 2013-08-01 | 2013-10-09 | 新疆中泰化学股份有限公司 | Stripping system and stripping method for cleaning waste sodium hypochlorite in production of acetylene by virtue of calcium carbide method |
| CN105731714A (en) * | 2014-12-06 | 2016-07-06 | 哈尔滨金大环境工程有限公司 | Wastewater treatment apparatus and treatment method thereof |
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