CN111375301A - Treatment method of tail gas produced by chlorinated pinacolone - Google Patents
Treatment method of tail gas produced by chlorinated pinacolone Download PDFInfo
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- CN111375301A CN111375301A CN201911420684.XA CN201911420684A CN111375301A CN 111375301 A CN111375301 A CN 111375301A CN 201911420684 A CN201911420684 A CN 201911420684A CN 111375301 A CN111375301 A CN 111375301A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/78—Liquid phase processes with gas-liquid contact
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Abstract
The invention discloses a method for treating tail gas generated in chlorinated pinacolone production, which comprises the following steps: and (3) molecular capture: carrying out molecular capture on the tail gas by adopting an organic matter capture agent to obtain chlorinated pinacolone gas in the tail gas; falling film water absorption: absorbing hydrogen chloride gas in the tail gas by adopting a falling film water absorption method to obtain a hydrogen chloride solution; alkali liquor absorption: absorbing the tail gas after falling film water absorption by alkali liquor to remove hydrogen chloride gas which is not completely removed from the tail gas; activated carbon adsorption: the invention has the advantages that the tail gas is physically adsorbed by adopting the active carbon, and harmful gases in the tail gas are adsorbed and removed.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to a method for treating tail gas produced by chlorinated pinacolone.
Background
At present, the factory is always puzzled by the problem that hydrogen chloride is mixed with organic matters in the production process of chlorinated pinacolone. Through research and practical application, the effect achieved by the mode of falling film absorption, alkali absorption and activated carbon is good, but the method is not perfect, and the quality of the hydrochloric acid obtained at the tail end of the process is lower and the content of organic matters exceeds the standard. The active carbon originally used for adsorption needs to be replaced regularly, so that the production capital burden of enterprises is increased, and the used active carbon brings secondary pollution problems and has certain defects.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a method for treating tail gas produced by chlorinated pinacolone, which separates organic matters and inorganic matters in a gas phase before falling film absorption of mixed waste gas, and the separated organic matters can be recovered and recycled, so that the content of the organic matters in hydrochloric acid can be greatly reduced, thereby improving the quality of the hydrochloric acid and reducing the using amount of active carbon.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a treatment method of tail gas generated in chlorinated pinacolone production comprises the following steps:
s100, molecular capture: carrying out molecular capture on the tail gas generated in the production of chlorinated pinacolone by adopting an organic matter capture agent to obtain chlorinated pinacolone gas in the tail gas generated in the production of chlorinated pinacolone;
s200, falling film water absorption: absorbing hydrogen chloride gas in tail gas generated in the production of chlorinated pinacolone by adopting a falling film water absorption method to obtain a hydrogen chloride solution;
s300, absorbing alkali liquor: absorbing alkali liquor in the chlorinated pinacolone production tail gas after falling film water absorption, and removing hydrogen chloride gas which is not removed in the chlorinated pinacolone production tail gas;
s400, activated carbon adsorption: and the tail gas produced by the chlorinated pinacolone is physically adsorbed by using activated carbon, so that harmful gases in the tail gas produced by the chlorinated pinacolone are adsorbed and removed.
Preferably, in the method for treating chlorinated pinacolone production tail gas, in step S100, a secondary capture agent is adopted to continuously capture chlorinated pinacolone gas in the chlorinated pinacolone production waste gas in the molecular capture process.
Preferably, in the method for treating chlorinated pinacolone production tail gas, ethanol is used as the capturing agent in step S100.
Preferably, in the method for treating chlorinated pinacolone production exhaust gas, the intake air concentration of chlorinated pinacolone production exhaust gas is adjusted before the molecular capture in step S100.
Preferably, in the method for treating the tail gas generated in the production of chlorinated pinacolone, the intake air concentration is adjusted to be 6000 to 10000ppm when the intake air concentration is adjusted.
Preferably, in the method for treating chlorinated pinacolone production tail gas, in step S100, the inflow rate of chlorinated pinacolone production tail gas is 0.1L/min.
Preferably, in the method for treating the chlorinated pinacolone production exhaust gas, in step S200, falling film water absorption of the chlorinated pinacolone production exhaust gas is performed in a cold water bath environment.
The invention has the beneficial effects that:
the invention has reasonable design, separates the hydrogen chloride and the organic gas through molecular capture, greatly reduces the difficulty of purifying the waste hydrochloric acid, achieves resource recycling through desorption regeneration, can recycle the capture agent, saves the cost of waste gas treatment, and greatly reduces the treatment load of the activated carbon and the secondary pollution after fully absorbing and treating the tail gas generated in the production of the chlorinated pinacolone.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram showing the relationship between the types of capture agents and the removal efficiency of tail gas from the production of chlorinated pinacolone;
FIG. 2 is a graph showing the relationship between the gas flow rate and the removal efficiency of tail gas from the production of chlorinated pinacolone;
FIG. 3 is a graph showing the removal rate of the feed gas having a concentration of 1000 to 3000 ppm;
FIG. 4 is a graph showing the removal rate of an intake gas having a concentration of 3000 to 6000 ppm;
FIG. 5 is a graph showing the removal rate of an intake gas having a concentration of 6000 to 10000ppm
FIG. 6 is a graph of removal rates for different inlet gas concentrations;
FIG. 7 is a flow chart of the method for treating tail gas from the production of chlorinated pinacolone.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 7, this embodiment is a method for treating tail gas from pinacolone chloride production, including the following steps:
s100, molecular capture: the method comprises the steps of carrying out molecular capture on chlorinated pinacolone production tail gas by adopting an organic matter capture agent to obtain chlorinated pinacolone gas in the chlorinated pinacolone production tail gas, and continuously capturing the chlorinated pinacolone gas in the chlorinated pinacolone production waste gas by adopting a secondary capture agent in the molecular capture process, wherein the capture agent adopts ethanol. Adjusting the air inlet concentration of waste gas generated in the production of chlorinated pinacolone before molecular capture, wherein the air inlet concentration is adjusted to be 6000-10000 ppm, and the air inlet flow rate of tail gas generated in the production of chlorinated pinacolone is 0.1L/min;
s200, falling film water absorption: absorbing hydrogen chloride gas in the tail gas of the chlorinated pinacolone production by adopting a falling film water absorption method to obtain a hydrogen chloride solution, and absorbing the falling film water of the waste gas of the chlorinated pinacolone production in a cold water bath environment;
s300, absorbing alkali liquor: absorbing alkali liquor in the chlorinated pinacolone production tail gas after falling film water absorption, and removing hydrogen chloride gas which is not removed in the chlorinated pinacolone production tail gas;
s400, activated carbon adsorption: and the tail gas produced by the chlorinated pinacolone is physically adsorbed by using activated carbon, so that harmful gases in the tail gas produced by the chlorinated pinacolone are adsorbed and removed.
In the implementation process, the relevant parameters in step S100 are tested to obtain the best embodiment, specifically:
(1) influence of the type of the capture agent on the removal efficiency of tail gas generated in the production of chlorinated pinacolone:
in the experiment, two capture agents, namely a capture agent H and a capture agent J are mainly selected, wherein the capture agent H adopts ethanol, and the capture agent J adopts diethyl ether, so that the capture effects of the capture agents are respectively researched. In a specific experiment, two-stage capture is adopted, wherein pinacolone passes through a flow meter to reach a first-stage capture agent, captured gas is introduced into a second-stage capture agent, and the volume of each-stage capture agent is 40 mL. Respectively measuring the removal effect of different capture agents on the pinacolone gas under the same experimental conditions, and further comparing the pinacolone capture agents to be more suitable. The specific experimental data and treatments are shown in fig. 1 and table 1:
| species of capture agent | Maximum value of removal rate |
| Two-stage scavenger H | 99.81% |
| Two-stage trapping agent J | 98.68% |
TABLE 1 numerical table of the types of capture agents and the removal efficiency of tail gas from chlorinated pinacolone production
As can be seen from the graph, the best value of the removal efficiency is, in general, that the two-stage H trap is slightly better than the two-stage J trap.
(2) Influence of different gas flow rates on tail gas removal efficiency in chlorinated pinacolone production
The flow rate of the gas also has a great influence on the experiment because different gas flow rates determine the residence time of the gas in the capture agent, and generally, the slower the gas flow rate, the longer the residence time, the better the removal efficiency. In the specific experiment operation, four groups of flow rates of 0.1L/min, 0.2L/min, 0.4L/min and 0.8L/min are adopted in the experiment for controlling the flow rate of the gas mainly by controlling the gas flowmeter. The experimental data and processing are shown in fig. 2 and table 2:
| flow rate/(L/min) | Maximum value of removal rate |
| 0.1 | 99.81% |
| 0.2 | 99.56 % |
| 0.4 | 99.38% |
| 0.8 | 98.69% |
TABLE 2 gas flow rate and chlorinated pinacolone production tail gas removal efficiency numerical table
The optimum flow rate is 0.1L/min as can be seen from the graph. The removal efficiency is better because the smaller the flow rate, the longer the gas residence time in the absorbent.
(3) As shown in figures 3 to 6, the efficiency of removing tail gas generated in the production of chlorinated pinacolone by different air inlet concentrations
Influence of (2)
As can be seen from the graph, the capture effect of the capture agent on the gas is increased along with the continuous increase of the concentration, and when the concentration is 6000-10000 ppm, the removal efficiency is about 99.70% optimally.
The invention has reasonable design, separates the hydrogen chloride and the organic gas through molecular capture, greatly reduces the difficulty of purifying the waste hydrochloric acid, achieves resource recycling through desorption regeneration, can recycle the capture agent, saves the cost of waste gas treatment, and greatly reduces the treatment load of the activated carbon and the secondary pollution after fully absorbing and treating the tail gas generated in the production of the chlorinated pinacolone.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A treatment method for tail gas generated in chlorinated pinacolone production is characterized by comprising the following steps:
s100, molecular capture: carrying out molecular capture on the tail gas generated in the production of chlorinated pinacolone by adopting an organic matter capture agent to obtain chlorinated pinacolone gas in the tail gas generated in the production of chlorinated pinacolone;
s200, falling film water absorption: absorbing hydrogen chloride gas in tail gas generated in the production of chlorinated pinacolone by adopting a falling film water absorption method to obtain a hydrogen chloride solution;
s300, absorbing alkali liquor: absorbing alkali liquor in the chlorinated pinacolone production tail gas after falling film water absorption, and removing hydrogen chloride gas which is not removed in the chlorinated pinacolone production tail gas;
s400, activated carbon adsorption: and the tail gas produced by the chlorinated pinacolone is physically adsorbed by using activated carbon, so that harmful gases in the tail gas produced by the chlorinated pinacolone are adsorbed and removed.
2. The method for treating tail gas generated in chlorinated pinacolone production according to claim 1, which is characterized in that: in the step S100, a secondary capture agent is adopted to continuously capture the chlorinated pinacolone gas in the waste gas generated in the production of chlorinated pinacolone in the process of molecular capture.
3. The method for treating tail gas generated in chlorinated pinacolone production according to claim 1, which is characterized in that: in step S100, polyether is used as the capturing agent.
4. The method for treating tail gas generated in chlorinated pinacolone production according to claim 1, which is characterized in that: in step S100, the intake air concentration of the waste gas from the production of chlorinated pinacolone is adjusted before the molecular capture.
5. The method for treating tail gas generated in chlorinated pinacolone production according to claim 4, which is characterized in that: when the intake air concentration is adjusted, the intake air concentration is adjusted to be 6000-10000 ppm.
6. The method for treating tail gas generated in chlorinated pinacolone production according to claim 1, which is characterized in that: in step S100, the air inlet flow rate of tail gas generated in the production of chlorinated pinacolone is 0.1L/min.
7. The method for treating tail gas generated in chlorinated pinacolone production according to claim 1, which is characterized in that: in step S200, falling film water absorption of chlorinated pinacolone production waste gas is performed in a cold water bath environment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430180A (en) * | 2020-10-24 | 2021-03-02 | 湖北山水化工有限公司 | Process system and process for preparing chloropinacolone |
| CN113087604A (en) * | 2021-04-19 | 2021-07-09 | 鹤壁全丰生物科技有限公司 | Production process of chloropinacolone |
| CN113663483A (en) * | 2021-10-22 | 2021-11-19 | 南通鸿富达利化工有限公司 | Tail gas recovery equipment used in pinacolone production process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206853406U (en) * | 2017-06-30 | 2018-01-09 | 重庆天原化工有限公司 | A kind of chloromethanes compressor tail gas recycling device |
| CN110357922A (en) * | 2019-07-03 | 2019-10-22 | 昌和化学新材料(江苏）有限公司 | The processing of triphenyl phosphite based on graphite condenser and tail gas treatment process |
-
2019
- 2019-12-31 CN CN201911420684.XA patent/CN111375301A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206853406U (en) * | 2017-06-30 | 2018-01-09 | 重庆天原化工有限公司 | A kind of chloromethanes compressor tail gas recycling device |
| CN110357922A (en) * | 2019-07-03 | 2019-10-22 | 昌和化学新材料(江苏）有限公司 | The processing of triphenyl phosphite based on graphite condenser and tail gas treatment process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430180A (en) * | 2020-10-24 | 2021-03-02 | 湖北山水化工有限公司 | Process system and process for preparing chloropinacolone |
| CN113087604A (en) * | 2021-04-19 | 2021-07-09 | 鹤壁全丰生物科技有限公司 | Production process of chloropinacolone |
| CN113663483A (en) * | 2021-10-22 | 2021-11-19 | 南通鸿富达利化工有限公司 | Tail gas recovery equipment used in pinacolone production process |
| CN113663483B (en) * | 2021-10-22 | 2021-12-28 | 南通鸿富达利化工有限公司 | Tail gas recovery equipment used in pinacolone production process |
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