CN114570186A - Environment-friendly treatment method for tail gas generated in production of sulfur-containing silane coupling agent - Google Patents
Environment-friendly treatment method for tail gas generated in production of sulfur-containing silane coupling agent Download PDFInfo
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- 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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- B01D53/02—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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- 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
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- 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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- 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
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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Abstract
The invention discloses an environment-friendly treatment method of tail gas produced by a sulfur-containing silane coupling agent, which belongs to the technical field of chemical industry, the scheme is that the tail gas produced by the sulfur-containing silane coupling agent is sequentially treated by a condensing system, an inorganic saline solution absorption system or a water absorption system, a defoaming system, a 0.1-1% low-concentration sodium hydroxide aqueous solution absorption system, a 10-15% medium-concentration sodium hydroxide aqueous solution absorption system and a VOCs waste gas treatment system, and finally, the tail gas is discharged after reaching the standard through an online monitoring device, so that all components in the tail gas produced by the sulfur-containing silane coupling agent can be effectively removed from the tail gas and recycled or further subjected to environment-friendly treatment, the environment-friendly problem of the traditional tail gas treatment process is solved, the generation of wastes is effectively avoided, and the purposes of energy conservation and emission reduction are achieved.
Description
Technical Field
The invention relates to environment-friendly treatment of chemical synthesis tail gas, in particular to an environment-friendly treatment method of tail gas produced by a sulfur-containing silane coupling agent.
Background
The sulfur-containing silane coupling agent is a rubber additive, is widely applied to industries such as tires, rubber products and the like, and is an essential additive for producing green and environment-friendly tires. At present, the large-scale industrial production of the sulfur-containing silane coupling agent mainly adopts a water phase method and takes inorganic sulfide aqueous solution and alkoxy silane as raw materials for production. In the production process of the sulfur-containing silane coupling agent, sulfide gas is inevitably generated no matter in the initial synthesis stage or the subsequent distillation and purification stage, and especially in the synthesis stage, inorganic sulfide is adopted as a raw material, hydrogen sulfide gas is a byproduct in the reaction process, and other organic sulfides are adopted, so that how to safely, effectively and environmentally treat sulfide tail gas is a problem to be faced by many manufacturers. In the prior art, sodium sulfide or caustic soda is commonly used for absorbing hydrogen sulfide gas in tail gas to generate a sodium hydrosulfide solution, but the generated sodium hydrosulfide solution contains more impurities, particularly organic sulfide impurities, which influence subsequent use.
Therefore, the invention of an exhaust gas treatment method capable of solving the above problems is a problem which is urgently needed to be solved at present.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide an environment-friendly treatment method for tail gas produced by a sulfur-containing silane coupling agent, through the treatment method, the tail gas produced by the sulfur-containing silane coupling agent produced by a water phase method can be effectively separated or removed from the tail gas, and finally, the tail gas is monitored by an online device to be discharged after reaching standards, the separated components are effectively recycled, organic components are recycled in the production of the sulfur-containing silane coupling agent, hydrogen sulfide gas can be completely and fully absorbed and cannot escape into the atmosphere, the environment-friendly problem of the tail gas produced by the sulfur-containing silane coupling agent is solved, the generation of wastes is avoided, the environment of a factory is improved, and the purposes of energy conservation and emission reduction are achieved.
1. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The method is characterized in that the tail gas produced by producing the sulfur-containing silane coupling agent by the water phase method flows out of a production system and a condensation system of the sulfur-containing silane coupling agent, sequentially passes through an inorganic saline solution absorption system or a water absorption system, a defoaming system, a 0.1-1% low-concentration sodium hydroxide aqueous solution absorption system, a 10-15% medium-concentration sodium hydroxide aqueous solution absorption system and a VOCs organic waste gas treatment system, and is finally monitored by an on-line device to reach the standard and be discharged.
In the scheme of the invention, the sulfur-containing silane coupling agent is a polysulfide silane coupling agent, a mercaptosilane coupling agent or a thiocarboxylate silane coupling agent. Representative examples include, but are not limited to: bis (3-propyltriethoxysilane coupling agent) polysulfide, bis (3-propyltriethoxysilane coupling agent) disulfide, bis (3-propyltriethoxysilane coupling agent) tetrasulfide, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropylmethyldiethoxysilane, 3-mercaptopropylethoxydi (tridecylpentaethylether) silane, 3-mercaptopropyl-2, 2 ', 2 ' ' -nitrilotriethoxysilane, 3-mercaptopropylethoxydi (propylhexapolypropylether) silane, 3-hexanoylthio-1-propyltriethoxysilane, 3-octanoylthio-1-propyltriethoxysilane, 3-octanoylthio-1-propylethoxy (2-methyl-1, 3-propyleneglycolidene) silane, and the like.
In the scheme of the invention, the aqueous phase method for producing the sulfur-containing silane coupling agent refers to the production by using an inorganic sulfide aqueous solution and alkoxy silane as raw materials, and is carried out under the condition of a phase transfer catalyst if necessary, and optionally a buffering agent and/or other additives, and the specific process comprises the following steps:
(1) reacting sodium polysulfide aqueous solution with chloroalkyl alkoxy silane to synthesize polysulfide silane coupling agent, wherein the sodium polysulfide can be prepared by reacting any one or more of sodium sulfide, sodium hydrosulfide, sodium hydroxide and lower-level sodium polysulfide with sulfur; after the synthesis is finished, the polysulfide silane coupling agent is prepared through further processing procedures such as phase separation, distillation and/or water removal.
(2) Reacting any one or more of hydrogen sulfide, sodium hydrosulfide, sodium sulfide and sodium hydroxide with chloroalkyl alkoxy silane to synthesize a mercaptosilane coupling agent; after the synthesis is finished, the mercaptosilane coupling agent is prepared through further processing procedures such as phase separation, distillation and/or water removal.
(3) Reacting any one or more of sodium hydrosulfide, sodium sulfide and sodium hydroxide with acyl chloride to prepare sodium thiocarboxylate, and reacting the sodium thiocarboxylate with chlorohydrocarbonyl alkoxy silane to synthesize a thiocarboxylate silane coupling agent; after the synthesis is finished, the thiocarboxylate silane coupling agent is prepared through further processing procedures such as phase separation, distillation and/or water removal procedures.
Further, the phase transfer catalyst, preferably a quaternary ammonium salt catalyst or a quaternary phosphonium salt catalyst, includes methyltriethylammonium chloride, dodecyltrimethylammonium chloride, tetraethylammonium bromide, tetrapropylammonium chloride, tetrapropylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium hydrogen sulfate, tetrabutylammonium acetate, and the like; more preferred are tetrapropylammonium chloride, tetrapropylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium bromide, triphenylmethylphosphonium bromide, triphenylethylphosphonium bromide, triphenylpropylphosphonium bromide, triphenylbutylphosphonium bromide and benzyltriphenylphosphonium chloride.
Further, the buffer includes any one of sodium bicarbonate, sodium carbonate, sodium dihydrogen phosphate, disodium hydrogen phosphate, or a mixture thereof.
In the scheme of the invention, the tail gas generated in the production of the sulfur-containing silane coupling agent by the aqueous phase method comprises the tail gas generated in a synthesis stage and the tail gas generated in a distillation stage.
In the scheme of the invention, the tail gas generated in the production of the sulfur-containing silane coupling agent is likely to be discharged along with the tail gas due to the influence of gas-liquid entrainment, and comprises the following steps: hydrogen sulfide gas, gas-liquid entrained sulfur-containing silane coupling agent liquid, gas-liquid entrained side reaction product organic sulfide liquid, gas-liquid entrained liquid water, decomposition products of a buffering agent such as carbon dioxide gas, chloro-alkyl alkoxy silane hydrolysis products such as ethanol and the like.
In the scheme of the invention, the production system and the condensation system of the sulfur-containing silane coupling agent comprise a synthesis system and a distillation system, the condensation system comprises a most basic condenser and a receiving tank, cooling water and/or frozen brine are introduced into the condenser, and the condensation system is used for removing condensable parts in tail gas by cooling, wherein the condensable parts comprise most of sulfur-containing silane coupling agent liquid, organic sulfide liquid as a side reaction product, water and the like.
Further, the inorganic salt in the inorganic salt water solution absorption system is sodium chloride or a buffering agent used for producing the sulfur-containing silane coupling agent by an aqueous phase method.
Still further, the inorganic salt in the inorganic salt aqueous solution absorption system is sodium chloride, preferably, the concentration of the sodium chloride aqueous solution is not less than 18%, and more preferably, the sodium chloride aqueous solution is saturated.
Furthermore, the inorganic salt water solution is a sodium chloride water solution, and the sodium chloride water solution is derived from a byproduct of the production of the sulfur-containing silane coupling agent by the water phase method; the aqueous phase method for producing the sulfur-containing silane coupling agent adopts inorganic sulfide aqueous solution and alkoxy silane as raw materials, and generally produces a sodium chloride aqueous solution at the same time except for the main product of the sulfur-containing silane coupling agent, and the sodium chloride aqueous solution can be used in an inorganic salt aqueous solution absorption system.
Furthermore, the tail gas enters the inorganic salt water solution absorption system in a submerged mode, the inorganic salt water solution absorption system is used for washing the tail gas in the submerged mode to remove organic matters in the tail gas, particularly sulfur-containing silane coupling agent liquid carried by gas and liquid, the organic matters are prevented from entering the sodium hydroxide water solution absorption system to influence the recycling of the tail gas, the advantage of low solubility of hydrogen sulfide gas in the inorganic salt water solution absorption system is utilized to avoid the hydrogen sulfide gas from being dissolved in the absorption system at the stage, the organic sulfur-containing silane coupling agent is hardly hydrolyzed and loses efficacy in the inorganic salt water solution within a short time, and the aim of fully recycling can be achieved.
Further, in the inorganic salt aqueous solution absorption system or the water absorption system, the tail gas is recycled into a synthesis system for producing the sulfur-containing silane coupling agent by a water phase method after absorption, and is added into the synthesis system after synthesis and before phase separation, wherein the absorbed organic sulfur-containing silane coupling agent liquid enters an organic phase of the synthesis system to achieve the purpose of recycling, the inorganic salt aqueous solution or water enters a water phase of the synthesis system to achieve the purpose of recycling, and through the further recycling treatment, the inorganic salt aqueous solution absorption system or the water absorption system can be used for washing and removing the organic sulfur-containing silane coupling agent liquid in the tail gas without generating new waste.
In the scheme of the invention, the defoaming system comprises the most basic unit structure of a demister and a collecting tank, the demister adopts a wire mesh for defoaming, and the step is arranged for removing gas-liquid entrainment of an inorganic salt water solution absorption system or a water absorption system, further removing trace organic matter liquid and preventing the organic matter liquid from entering a sodium hydroxide absorption system. The liquid collected by the defoaming system is reused in a synthesis system for producing the sulfur-containing silane coupling agent by the aqueous phase method, and is added into the synthesis system after the synthesis and before phase separation, and after the recovery treatment, the organic sulfur-containing silane coupling agent carried in all tail gas returns to the synthesis system without generating new waste.
Further, the tail gas of the 0.1-1% low-concentration sodium hydroxide water solution absorption system is recycled to a water phase method to produce a sulfur-containing silane coupling agent after being absorbed, the sulfur-containing silane coupling agent is used as a raw material and is added into the system before the synthesis system starts to feed, and the 0.1-1% low-concentration sodium hydroxide water solution absorption system is mainly used for absorbing most of hydrogen sulfide gas to generate sodium sulfide and sodium hydrosulfide; preferably, controlling the pH value of the absorption system to be 9.5 as a control condition for reaching absorption saturation, and simultaneously, judging whether the absorption system is colorless after dropwise adding a phenolphthalein indicator as no sodium hydroxide residue, namely, converting 0.1-1% of low-concentration sodium hydroxide into sodium sulfide as an end point of absorption saturation; the absorption system of the sodium hydroxide aqueous solution with the low concentration of 0.1% -1% is controlled to be converted into sodium sulfide, hydrogen sulfide in tail gas can be absorbed to the maximum extent, hydrogen sulfide is prevented from overflowing to the next step, meanwhile, the sodium hydroxide aqueous solution with the low concentration of 0.1% -1% is controlled, the absorption system can be saturated more quickly, but sodium sulfide solid crystallization at low temperature can not occur, pipeline blockage is caused, the sodium sulfide aqueous solution with the low concentration is reused for producing the sulfur-containing silane coupling agent by the aqueous phase method, the influence on the raw material control of producing the sulfur-containing silane coupling agent by the aqueous phase method is minimized, and automatic control is facilitated. Further, an on-line pH meter is used as a pH value measuring device.
Further, in the 10% -15% medium-concentration sodium hydroxide aqueous solution absorption system, the tail gas is absorbed and then recycled to a water phase method to produce the sulfur-containing silane coupling agent, and the sulfur-containing silane coupling agent is used as a raw material and added to the system before the feeding of the synthesis system, so that the purpose of the step is to absorb the trace hydrogen sulfide which cannot be absorbed in the last step and prevent the hydrogen sulfide from overflowing to the next step.
Furthermore, the 0.1% -1% low-concentration sodium hydroxide aqueous solution absorption system and the 10% -15% medium-concentration sodium hydroxide aqueous solution absorption system adopt a spraying mode to absorb hydrogen sulfide gas, and absorption liquid adopts pumping circulation.
Furthermore, the VOCs organic waste gas treatment system at least comprises a process of removing odor by using activated carbon.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can effectively separate or remove all components in the tail gas from the tail gas in the tail gas generated in the process of producing the sulfur-containing silane coupling agent by the water phase method, and finally, the tail gas is monitored by an online device and is discharged up to the standard, the separated components are effectively recycled, organic components are recycled in the process of producing the sulfur-containing silane coupling agent, hydrogen sulfide gas can be completely and sufficiently absorbed and cannot escape into the atmosphere, the environmental protection problem of tail gas produced by the sulfur-containing silane coupling agent is solved, the generation of waste is avoided, the environment of a factory is improved, and the purposes of energy conservation and emission reduction are achieved.
(2) By adopting the technical scheme of the invention, the gas in the tail gas generated by producing the sulfur-containing silane coupling agent by the aqueous phase method can be removed, the liquid and liquid drops carried by the gas can also be removed, the removal rate is high, and the environment-friendly cleaning treatment of the subsequent tail gas is effectively ensured.
(3) Compared with the traditional treatment process, the technical scheme of the invention is adopted, the sulfur-containing silane coupling agent is fully and effectively removed through the inorganic salt aqueous solution submerged washing absorption system and then through the defoaming system, the obtained sodium hydroxide aqueous solution absorption liquid is clear and transparent, has no residues of hydrolysate of the sulfur-containing silane coupling agent, and can be completely reused in a synthesis system of the sulfur-containing silane coupling agent.
(4) Compared with the prior art, the technical scheme of the invention adopts 0.1% -1% low-concentration sodium hydroxide aqueous solution as the absorption system, which is beneficial to absorbing hydrogen sulfide in tail gas to the maximum extent and avoiding hydrogen sulfide from overflowing to the next step, and simultaneously controls the low concentration of the sodium hydroxide aqueous solution to be 0.1% -1%, which is beneficial to saturating the absorption system more quickly but can not cause sodium sulfide solid crystallization at low temperature to cause pipeline blockage, and the low-concentration sodium sulfide aqueous solution is reused in the aqueous phase method to produce the sulfur-containing silane coupling agent, so that the raw material control for producing the sulfur-containing silane coupling agent by the aqueous phase method is influenced to the lowest extent, and the automatic control is more convenient.
(5) Compared with the traditional treatment process, the technical scheme of the invention adopts 0.1-1% of low-concentration sodium hydroxide aqueous solution as an absorption system, so that the obtained low-concentration sodium sulfide can be ensured to be reused in a synthesis system of the sulfur-containing silane coupling agent in time without generating solid crystals, and then the absorption system of 10-15% of medium-concentration sodium hydroxide aqueous solution is adopted, and the hydrogen sulfide gas can be ensured to be fully absorbed and not overflow out of the system to pollute the environment.
Drawings
FIG. 1 is a main flow chart of the present invention.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, the tail gas generated in the production of the sulfur-containing silane coupling agent by the aqueous phase method flows out of a production system and a condensation system of the sulfur-containing silane coupling agent, and is sequentially treated by an inorganic saline solution absorption system, a defoaming system, a 0.5% low-concentration sodium hydroxide aqueous solution absorption system, a 10% -15% medium-concentration sodium hydroxide aqueous solution absorption system and a VOCs organic waste gas treatment system, and finally is monitored by an online device to reach the emission standard.
A synthesis system and a condensation system for producing the sulfur-containing silane coupling agent by a water phase method: in a reaction kettle, sodium sulfide aqueous solution and sulfur are used as raw materials to synthesize sodium polysulfide, then the sodium polysulfide reacts with 3-chloropropyltriethoxysilane under the condition of tetrabutylammonium bromide phase transfer catalyst to generate bis (3-propyltriethoxysilane coupling agent) polysulfide and a byproduct sodium chloride aqueous solution, tail gas generated in the synthesis process flows out of the reaction kettle, enters a condenser filled with cooling water, a small amount of liquid is condensed, and the tail gas flows out of a condensation system and enters a next inorganic salt aqueous solution absorption system. After the reaction is finished, the materials in the reaction kettle are collectively called as a bis (3-propyltriethoxysilane coupling agent) polysulfide crude product mixed solution, the upper layer is an organic phase bis (3-propyltriethoxysilane coupling agent) polysulfide crude product, and the lower layer is an aqueous phase byproduct sodium chloride aqueous solution.
Inorganic salt aqueous solution absorption system and defoaming system: the inorganic salt water solution absorption system is a saturated sodium chloride water solution, tail gas enters the saturated sodium chloride water solution absorption system through the liquid, flows into the defoaming system from the system after being washed, and flows out of the defoaming system after defoaming to enter the next 0.1% -1% low-concentration sodium hydroxide water solution absorption system. After the saturated sodium chloride aqueous solution is absorbed by an absorption system, the mixture is beaten into a mixed solution of a crude bis (3-propyltriethoxysilane coupling agent) polysulfide product of the next kettle, after stirring, the bis (3-propyltriethoxysilane coupling agent) polysulfide absorbed and recovered by the absorption system of the saturated sodium chloride aqueous solution enters an organic phase crude bis (3-propyltriethoxysilane coupling agent) polysulfide product, and a saturated sodium chloride aqueous solution enters a lower-layer aqueous phase, and then the lower-layer aqueous phase material beating part is placed into an inorganic salt aqueous solution absorption system to be used as an absorption liquid of the next kettle. A small amount of liquid is collected by the defoaming system, and the liquid is a sodium chloride aqueous solution through detection and has no bis (3-propyltriethoxysilane coupling agent) polysulfide residue; the liquid and a saturated sodium chloride aqueous solution absorption liquid are mixed together and fed into a next kettle of a mixed solution of a crude bis (3-propyltriethoxysilane coupling agent) polysulfide.
0.5% low-concentration aqueous sodium hydroxide solution absorption system: and (3) after the tail gas flows out of the defoaming system, the tail gas enters the 0.5% low-concentration sodium hydroxide aqueous solution absorption system, when the pH value of the system reaches 9.5, simultaneously, the system is colorless after a phenolphthalein indicator is dripped, the judgment is made that no sodium hydroxide remains, the absorption liquid is completely converted into sodium sulfide, the absorption is saturated, and the solution with the saturated absorption is used as a raw material for synthesizing bis (3-propyltriethoxysilane coupling agent) polysulfide in the next kettle to replace part of the raw material of the sodium sulfide aqueous solution. The tail gas is washed by the inorganic salt water solution absorption system and then enters the 0.5% low-concentration sodium hydroxide water solution absorption system, and the 0.5% low-concentration sodium hydroxide water solution absorption system is clear after absorption saturation and has no white slag of the polysulfide hydrolysate of bis (3-propyltriethoxysilane coupling agent).
10% -15% medium concentration sodium hydroxide water solution absorption system: after the tail gas flows out of the 0.5% low-concentration sodium hydroxide aqueous solution absorption system, the tail gas enters the 10% -15% medium-concentration sodium hydroxide aqueous solution absorption system, the continuous operation is carried out for 2 months, the pH value of the 10% -15% medium-concentration sodium hydroxide aqueous solution absorption system is still 13, a phenolphthalein indicator is dropwise added to obtain red, and the sodium hydroxide is judged to be not absorbed and saturated; continuously operating for 6 months, wherein the pH value of the 10-15% medium-concentration sodium hydroxide aqueous solution absorption system is 9.5, the sodium hydroxide is colorless after a phenolphthalein indicator is dripped, the sodium hydroxide is judged to be saturated and converted into a sodium sulfide solution, and the saturated solution is used as a raw material for synthesizing bis (3-propyltriethoxysilane coupling agent) polysulfide in the next kettle to replace part of the sodium sulfide aqueous solution raw material.
Comparative example 1:
the other systems are the same as example 1, except that the tail gas of the comparative example is directly introduced into the defoaming system without passing through the inorganic salt water solution absorption system.
The results of the tail gas treatment show: after the defoaming system is operated for 1 week, collecting a large amount of liquid, detecting that the liquid is sodium chloride aqueous solution and contains a large amount of bis (3-propyltriethoxysilane coupling agent) polysulfide residues; after the 0.5% low-concentration sodium hydroxide aqueous solution absorption system operates for 3 days, the surface of the absorption system has obvious white viscous slag which is hydrolysate of bis (3-propyltriethoxysilane coupling agent) polysulfide.
It can be seen from the above examples and comparative examples that, after the tail gas is treated by the method of the present invention, the appearance of the low concentration sodium hydroxide aqueous solution absorption system is clear, white viscous slag caused by silane hydrolysis is not generated, bis (3-propyltriethoxysilane coupling agent) polysulfide entrained in the tail gas is completely removed, and the low concentration sodium hydroxide aqueous solution absorption system can be completely reused in bis (3-propyltriethoxysilane coupling agent) polysulfide after absorption saturation; in addition, a low-concentration sodium hydroxide aqueous solution absorption system is adopted to absorb hydrogen sulfide, the pH value is controlled to be 9.5, the hydrogen sulfide can be fully absorbed, and the medium-concentration sodium hydroxide aqueous solution absorption system in the next step can run for a long time.
According to the scheme, tail gas generated in the production of the sulfur-containing silane coupling agent by the water phase method sequentially passes through an inorganic saline solution absorption system, a defoaming system, a 0.1-1% low-concentration sodium hydroxide aqueous solution absorption system, a 10-15% medium-concentration sodium hydroxide aqueous solution absorption system and a VOCs organic waste gas treatment system, and is finally monitored by an online device to reach the standard and be discharged, and all components in the tail gas can be effectively separated or removed from the tail gas and recycled.
As described above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; those skilled in the art can appreciate that the present invention is not limited to the specific embodiments disclosed herein; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (10)
1. The method is characterized in that the tail gas generated in the production of the sulfur-containing silane coupling agent by the water phase method flows out of a production system and a condensation system of the sulfur-containing silane coupling agent, and then is sequentially treated by an inorganic saline solution absorption system or a water absorption system, a defoaming system, a 0.1-1% low-concentration sodium hydroxide aqueous solution absorption system, a 10-15% medium-concentration sodium hydroxide aqueous solution absorption system and a VOCs organic waste gas treatment system, and finally is monitored by an online device to reach the standard and be discharged.
2. The method for environmentally treating tail gas from the production of sulfur-containing silane coupling agent according to claim 1, wherein the sulfur-containing silane coupling agent is polysulfide silane coupling agent, mercaptosilane coupling agent or thiocarboxylate silane coupling agent.
3. The environmental-friendly treatment method for the tail gas generated in the production of the sulfur-containing silane coupling agent according to claim 1, wherein the method for producing the sulfur-containing silane coupling agent by the aqueous phase method comprises the following steps: the production is carried out by taking inorganic sulfide aqueous solution and alkoxy silane as raw materials under the condition of phase transfer catalyst, and optionally a buffering agent and/or other additives.
4. The method as claimed in claim 1, wherein the tail gas generated in the aqueous phase method for producing sulfur-containing silane coupling agent comprises tail gas generated in a synthesis stage and tail gas generated in a distillation stage.
5. The method as claimed in claim 1, wherein the inorganic salt in the inorganic salt solution absorption system is sodium chloride or a buffer used in the aqueous phase method for producing the sulfur-containing silane coupling agent.
6. The environmental protection treatment method for tail gas generated in the production of sulfur-containing silane coupling agent according to claim 1, wherein the tail gas enters the inorganic saline solution absorption system or the water absorption system in a submerged mode.
7. The environmental protection method for processing tail gas from sulfur-containing silane coupling agent production according to claim 1, wherein the tail gas is recovered to the synthesis system for producing sulfur-containing silane coupling agent by aqueous phase method after absorption in the inorganic salt aqueous solution absorption system or water absorption system, and is added to the synthesis system after synthesis and before phase separation.
8. The environmental-friendly treatment method for the sulfur-containing silane coupling agent production tail gas as claimed in claim 1, wherein the 0.1% -1% low-concentration sodium hydroxide aqueous solution is absorbed by the tail gas and then recycled to the aqueous phase method to produce the sulfur-containing silane coupling agent, and the sulfur-containing silane coupling agent is used as a raw material and added to the system before the synthesis system starts to feed.
9. The environmental protection treatment method for tail gas in production of sulfur-containing silane coupling agent according to claim 1 or 8, characterized in that the pH value of the 0.1% -1% low concentration sodium hydroxide aqueous solution absorption system is controlled to be 9.5 as a control condition for reaching absorption saturation, and meanwhile, the judgment that the tail gas is colorless after the phenolphthalein indicator is dripped as sodium hydroxide residue is adopted, namely the conversion of 0.1% -1% low concentration sodium hydroxide into sodium sulfide is the end point of absorption saturation.
10. The environment-friendly treatment method for the sulfur-containing silane coupling agent production tail gas as claimed in claim 1, wherein the 10% -15% medium-concentration sodium hydroxide aqueous solution absorption system recycles the tail gas after absorption to the aqueous phase method for producing the sulfur-containing silane coupling agent, and the sulfur-containing silane coupling agent is added into the system as a raw material before the feeding of the synthesis system is started.
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