CN205055791U - A processing apparatus for preparing tail gas among benzophenone - Google Patents
A processing apparatus for preparing tail gas among benzophenone Download PDFInfo
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- CN205055791U CN205055791U CN201520750907.XU CN201520750907U CN205055791U CN 205055791 U CN205055791 U CN 205055791U CN 201520750907 U CN201520750907 U CN 201520750907U CN 205055791 U CN205055791 U CN 205055791U
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- absorption tower
- phosgene
- tail gas
- purifying column
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- YBSUQOQJWMJNGQ-UHFFFAOYSA-N CC(C)CCC[NH+](C1CCCCC1)[O-] Chemical compound CC(C)CCC[NH+](C1CCCCC1)[O-] YBSUQOQJWMJNGQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The patent discloses a processing apparatus for preparing tail gas among benzophenone, including hydrogen chloride gas absorption tower, phosgene purifying column and alkali neutrodyne system, the hydrogen chloride gas absorption tower includes follows supreme sealing connection in proper order and communicating one -level absorption tower, secondary absorption tower and tertiary absorption tower down, and the top on tertiary absorption tower communicates with each other with the bottom sealing connection of phosgene purifying column, and sealing connection has the connecting pipe between the top of alkali neutrodyne system and phosgene purifying column, spray set is all located at the top on one -level absorption tower, secondary absorption tower and tertiary absorption tower, is equipped with the catalyst shower nozzle in the phosgene purifying column. Technical problem that this patent will be solved be provide an assimilation effect good, handle totally, a processing apparatus for preparing tail gas among benzophenone of environmental protection.
Description
Technical field
The utility model relates to chemical field, is specifically related to a kind for the treatment of apparatus for the preparation of tail gas in benzophenone.
Background technology
Benzophenone is white glossiness prismatic crystallization.Resembling rose, sweet taste, 1G is dissolved in 7.5ml ethanol, 6ml ether, is dissolved in chloroform, water insoluble, relative density (d504) 1.0869, fusing point 48.5 DEG C, boiling point 305.4 DEG C, index of refraction (n45.2D) 1.5975, flash-point 138 DEG C, irritant.Molecular formula: C
13h
10o, structural formula
; Molecular weight: 182; Physical and chemical performance: proportion: 1.098(g/cm
3, 20 DEG C), boiling point: 306 DEG C, water insoluble, is dissolved in many organic solvents such as ethanol, benzene, chloroform.Purposes: ultra-violet absorber, organic synthesis raw material and medicine intermediate, spices fixastive.
Existing benzophenone synthetic route has phosgenation, chlorobenzoyl chloride method, carbon dioxide process, carbon monoxide method, benzoic acid (or benzoyl oxide) method, carbon tetrachloride method, catalytic oxidation, decarboxylation method etc.Wherein phosgenation is with phosgene and benzene for raw material, take lewis acid as catalyst, carries out Friedel-Crafts reaction, through hydrolysis, layered shaping, refining etc. prepares benzophenone.It is high that the method has product quality, and reaction yield is higher, and process conditions are gentle, do not need by advantages such as special reagent and raw material are easy to get.The raw material that existing phosgenation prepares phosgene is mainly alchlor, benzene photoreactive gas, obtains through photochemical, hydrolysis, alkali cleaning, water-benzene distillation, distillation; Photochemical: to get alchlor 1 part and 1 part of phosgene is photochemical in photochemical still; Hydrolysis: in temperature less than 30 DEG C hydrolysis; Alkali cleaning: add sodium carbonate alkali cleaning, obtains material phase; Water-benzene distillation: obtain crude product; Finished product is obtained again after distillation rectifying; Wherein the molecular formula of benzene is C
6h
6, structural formula
, molecular weight is 78; Physico-chemical property: density: 0.879(g/cm
320 DEG C), boiling point: 80.4 DEG C; Basic chemical raw materials, water insoluble, be dissolved in many organic solvents such as ethanol, ether, gasoline, under certain condition, in molecule, hydrogen is replaced and produce halogenation, sulfonating reaction, and also can play addition reaction with chlorine, benzene is inflammable, explosive material; Explosion limit: mix 1.5 ~ 8%(volume ratio with air).
Aluminum trichloride (anhydrous) molecular formula: AlCl
3, molecular weight: 133.5, physico-chemical property: density 2.41(g/cm
320 DEG C) solubility: 69.9(g/100gH
2o20 DEG C) water-soluble, generate AlCl
36H
2o, also can be dissolved in ethanol, ether, releases large calorimetric, AlCl during dissolving
3there is strong adduction, generate dimeric molecule (AlCl
3)
2, the catalyst that alchlor can do organic synthesis also can be used for process lubricating oil and manufactures anthraquinone etc.; Outward appearance: the particle of faint yellow, yellow or grayish or powder, do not have and be greater than the block of 10mm.
The molecular formula of phosgene is COCl
2; Structural formula is
, molecular weight is 98.92, physical and chemical performance:
Proportion D
, 1.441, boiling point is 8.2 DEG C, is colourless gas, has rotten apple taste, have asphyxiating under normal temperature, belong to extremely toxic substance, aerial safe level is 0.5mg/m
3, phosgene is soluble in the organic solvent such as arsenic trichloride and glacial acetic acid, chloroform, toluene, chlorobenzene, water-soluble hardly; Be colourless gas under normal temperature, have rotten apple taste, have asphyxiating, belong to extremely toxic substance, aerial safe level is 0.5mg/m
3, phosgene is soluble in the organic solvent such as arsenic trichloride and glacial acetic acid, chloroform, toluene, chlorobenzene, water-soluble hardly.
Produce principle be: benzene under alchlor makes the condition of catalyst with phosgene generation acylation reaction; generate benzophenone-alchlor complex compound; namely obtain product through hydrolysis, alkali cleaning, distillation, sheeting, the mechanism of reaction and chemical equation are: (1) photochemical reaction: benzene generates benzophenone-alchlor complex compound with phosgene reaction under alchlor makes catalysts conditions:
。
(2) hydrolysis: benzophenone alchlor complex compound is met water decomposition and generated benzophenone:
。
The contingent side reaction of production process is that chlorobenzoyl chloride and alchlor reaction generate chlorobenzoyl chloride alchlor complex compound, meets water hydrolysis and generates the accessory substances such as benzoic acid, affect benzophenone product quality and yield.
。
In the process of producing, have hydrogen chloride gas produce, hydrogen chloride gas, be a kind of colourless non-combustible gas, have polar stimulation smell, proportion is greater than air, has corrosivity, and therefore, the tail gas of generation needs process.In addition, in the process of reaction, the incomplete phenomenon of phosgene reaction may be there is, and phosgene is poisonous, therefore, also needs unreacted phosgene process.During existing business processes, usually easy to operate object is in, directly discarded passing in alkaline solution is carried out neutralization reaction, although this kind of method of operating is simple and practical, the waste liquid produced after neutralization will could discharge usually after treatment, surface is seen simple to operate and practical, but in fact, add processing cost, and the feature of environmental protection is poor.For this reason, inventor improves processing method, by the absorption of tail gas through multi-level water, formation hydrochloric acid solution is recycled, then is used phosgene catalyst treatment to absorb, and finally passes in alkali neutralization solution and neutralizes, be disposed, but water absorbs, only by tail gas being passed into the mode in water, absorptivity is lower, and assimilation effect is poor, and existing device can not meet the enforcement of this method completely, therefore, inventor designs and is a kind ofly exclusively used in the treating apparatus preparing tail gas in benzophenone.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of good absorbing effect, processes the treating apparatus for the preparation of tail gas in benzophenone that is complete, environmental protection.
In order to solve the problems of the technologies described above, the utility model provides following technical scheme: for the preparation of the treating apparatus of tail gas in benzophenone, comprise hydrogen chloride gas absorbing tower, phosgene purifying column and alkali neutralising arrangement, hydrogen chloride gas absorbing tower comprises and being tightly connected successively from bottom to up and the first grade absorption tower communicated, two-level absorption tower and three grades of absorption towers, the top on three grades of absorption towers is connected with the sealed bottom of phosgene purifying column and communicates, and is sealedly connected with tube connector between the top of alkali neutralising arrangement and phosgene purifying column; Spray equipment is all located in the top on first grade absorption tower, two-level absorption tower and three grades of absorption towers, is provided with catalyst shower nozzle in phosgene purifying column.
Adopt the treating apparatus for the preparation of tail gas in benzophenone of technical solutions of the utility model, first grade absorption tower, two-level absorption tower and three grades of absorption towers are used for absorbing hydrogen chloride gas, and by three grades of absorptions, absorb more complete, phosgene purifying column is to prevent phosgene absorbing catalyst, and phosgene is absorbed, and alkali neutralising arrangement enters external environment in order to ensure without pernicious gas, neutralized with alkali, play a part to guarantee safe.The spray equipment object at the top on first grade absorption tower, two-level absorption tower and three grades of absorption towers is in order to gas passes into bottom first grade absorption tower, two-level absorption tower and three grades of absorption towers, gas upwards escapes, water then sprays from the spray equipment at top, thus increase the contact area of gas and water, hydrogen chloride gas is fully contacted with water, absorbs more complete.The catalyst of powdery sprays by catalyst shower nozzle from fountain head, thus increases the contact area of the residual exhaust after absorbing and catalyst, thus is beneficial to the absorption of phosgene.
Operation principle of the present utility model is: the tail gas produced in course of reaction, first the bottom of first grade absorption tower is entered, gas is upwards overflowed, simultaneously, top shower water from spray equipment of first grade absorption tower, contact with the water under spray and absorb while gas upwards escapes, thus absorb most of hydrogen chloride gas, then, tail gas enters the bottom of two-level absorption tower again from the top of first grade absorption tower, equally upwards overflow, simultaneously, shower water is sprayed water downwards, again absorb, tail gas after absorption enters in three grades of absorption towers again, identical reason absorbs again, now, basic hydrogen chloride gas is absorbed, remaining tail gas enters in phosgene purifying column through the top on three grades of absorption towers, simultaneously, catalyst shower nozzle ejection powder catalyst in phosgene purifying column, phosgene is absorbed, catalyst is generally active carbon, after phosgene purifying column, remaining tail gas passes in alkali neutralising arrangement through tube connector, if also have residue phosgene and hydrogen chloride gas, then neutralized by acid-base neutralization, be disposed.
The beneficial effects of the utility model are: compared with the existing mode being only acid-base neutralization, absorb more complete, and can hydrochloric acid be recycled, acid-base neutralization ensures do not have pernicious gas to overflow, owing to only there being the residual gas of minute quantity to need alkali to neutralize, therefore, liquid in alkali neutralising arrangement can repeatedly utilize, Comparatively speaking, reduce the cost disposed waste liquid, process is simple and cost is low.
Further, the top on described first grade absorption tower, two-level absorption tower and three grades of absorption towers is provided with some fountain heads, and the sidewall on described first grade absorption tower, two-level absorption tower and three grades of absorption towers is also provided with some fountain heads.Namely spray equipment is realized by fountain head, sidewall is also provided with fountain head, due to gas overflow time, be generally and overflow straight up, and the water that the spray head at top sprays usually is also straight down, therefore, there is blind area, the gas between water bundle then can not be absorbed, and after sidewall is provided with fountain head, can realize laterally also spraying current, thus dead zone-eliminating, increase the absorption of hydrogen chloride gas.
Further, the spray direction of described first grade absorption tower, two-level absorption tower and top, three grades of absorption towers fountain head is all to lopsidedness.The current parabolically shape of the fountain head ejection of tilting, therefore, the gap between the water bundle that can reduce ejection, thus increase hydrogen chloride gas and the contact area of water, increase absorption.
Further, the spray direction of described first grade absorption tower, two-level absorption tower and three grades of absorption tower sidewall fountain heads all upwards and and be provided with angle between sidewall.The water of the fountain head ejection of sidewall in spraying obliquely, thus forms parabolic shape, the gap between the water bundle that can reduce ejection, thus increases hydrogen chloride gas and the contact area of water, increases absorption.
Further, described catalyst shower nozzle is arranged at the sidewall of phosgene purifying column.Being convenient in the process that phosgene overflows from top to bottom all can contact catalyst, phosgene is absorbed more complete.
Further, the lower inner wall of described phosgene purifying column is also provided with the fan blade to blowing up.The catalyst dropping down onto bottom can upwards blow afloat by fan blade, thus can increase the contact cotton knot of catalyst and phosgene, phosgene is absorbed more complete.
Further, described alkali neutralising arrangement is rectangular channel, and the inwall junction of rectangular channel is arc-shaped transition.Arc-shaped transition is convenient to precipitation cleaning.
Accompanying drawing explanation
Fig. 1 is the schematic front view of the utility model for the preparation of the treating apparatus embodiment of tail gas in benzophenone.
In figure: first grade absorption tower 1, two-level absorption tower 2, three grades of absorption towers 3, fountain head 4, phosgene purifying column 5, catalyst shower nozzle 6, fan blade 7, alkali neutralising arrangement 8.
Detailed description of the invention
As shown in Figure 1, the utility model is for the preparation of the treating apparatus of tail gas in benzophenone, comprise hydrogen chloride gas absorbing tower, phosgene purifying column 5 and alkali neutralising arrangement 8, hydrogen chloride gas absorbing tower comprises and being tightly connected successively from bottom to up and the first grade absorption tower 1 communicated, two-level absorption tower 2 and three grades of absorption towers 3, the top on three grades of absorption towers 3 is connected with the sealed bottom of phosgene purifying column 5 and communicates, and the interface channel between three grades of absorption towers 3 and phosgene purifying column 5 is only the communicating passage at middle part, tube connector is sealedly connected with between the top of alkali neutralising arrangement 8 and phosgene purifying column 5, spray equipment is all located in the top on first grade absorption tower 1, two-level absorption tower 2 and three grades of absorption towers 3, some fountain heads 4 that spray equipment is first grade absorption tower 1, the top on two-level absorption tower 2 and three grades of absorption towers 3 is provided with, and the spray direction of top fountain head 4 tilts all to the left, the sidewall on first grade absorption tower 1, two-level absorption tower 2 and three grades of absorption towers 3 is also provided with some fountain heads 4, the spray direction of sidewall fountain head 4 all upwards and and be provided with 45 ° of angles between sidewall, catalyst shower nozzle 6 is provided with in phosgene purifying column 5, catalyst shower nozzle 6 is arranged at the sidewall of phosgene purifying column 5, the lower inner wall of phosgene purifying column 5 is also provided with the fan blade 7 to blowing up, alkali neutralising arrangement 8 is rectangular channel, puts into sodium hydroxide solution in rectangular channel, and the inwall junction of rectangular channel is arc-shaped transition.
In specific implementation process, in the process of reaction, the tail gas of generation is passed into the bottom of first grade absorption tower 1, gas upwards escapes, simultaneously, the fountain head 4 of top and sidewall is sprayed water simultaneously, because the spray direction of top fountain head 4 tilts all to the left, the spray direction of sidewall fountain head 4 all upwards and and be provided with 45 ° of angles between sidewall, therefore, ensure gapless between water bundle, a large amount of hydrogen chloride gas is only absorbed by the water, becomes hydrochloric acid; Gas is upwards overflowed from the top of first grade absorption tower 1 and is entered two-level absorption tower 2, the fountain head 4 of the same two-level absorption tower 2 top and sidewall is sprayed water absorbing hydrogen chloride gas again, the water that two-level absorption tower 2 sprays is to downstream in first grade absorption tower 1, can be used for again absorbing new tail gas, tail gas carries out third time absorb from entering three grades of absorption towers 3 after two-level absorption tower 2 is absorbed again, the shower water on three grades of absorption towers 3 is from top and sidewall ejection, flow out in two-level absorption tower 2 and first grade absorption tower 1, can be used for absorbing new tail gas; Tail gas after absorption is upwards overflowed again, enters in phosgene purifying column 5, and activated-carbon catalyst sprays by the catalyst shower nozzle 6 of phosgene purifying column 5 sidewall, fully contact with tail gas, meanwhile, the active carbon dropping down onto bottom blows afloat by fan blade 7, fully contacts, absorb more abundant, finally, tail gas enters in the rectangular channel of alkali neutralising arrangement 8 by tube connector, neutralizes with NaOH, during cleaning, arc-shaped transition is convenient to cleaning completely.
For a person skilled in the art; under the prerequisite not departing from the utility model structure; can also make some distortion and improvement, these also should be considered as protection domain of the present utility model, and these all can not affect effect and the practical applicability of the utility model enforcement.
Claims (7)
1. for the preparation of the treating apparatus of tail gas in benzophenone, it is characterized in that: comprise hydrogen chloride gas absorbing tower, phosgene purifying column and alkali neutralising arrangement, hydrogen chloride gas absorbing tower comprises and being tightly connected successively from bottom to up and the first grade absorption tower communicated, two-level absorption tower and three grades of absorption towers, the top on three grades of absorption towers is connected with the sealed bottom of phosgene purifying column and communicates, and is sealedly connected with tube connector between the top of alkali neutralising arrangement and phosgene purifying column; Spray equipment is all located in the top on first grade absorption tower, two-level absorption tower and three grades of absorption towers, is provided with catalyst shower nozzle in phosgene purifying column.
2. the treating apparatus for the preparation of tail gas in benzophenone according to claim 1, it is characterized in that: the top on described first grade absorption tower, two-level absorption tower and three grades of absorption towers is provided with some fountain heads, the sidewall on described first grade absorption tower, two-level absorption tower and three grades of absorption towers is also provided with some fountain heads.
3. the treating apparatus for the preparation of tail gas in benzophenone according to claim 2, is characterized in that: the spray direction of described first grade absorption tower, two-level absorption tower and top, three grades of absorption towers fountain head is all to lopsidedness.
4. the treating apparatus for the preparation of tail gas in benzophenone according to claim 3, is characterized in that: the spray direction of described first grade absorption tower, two-level absorption tower and three grades of absorption tower sidewall fountain heads all upwards and and be provided with angle between sidewall.
5. the treating apparatus for the preparation of tail gas in benzophenone according to claim 4, is characterized in that: described catalyst shower nozzle is arranged at the sidewall of phosgene purifying column.
6. the treating apparatus for the preparation of tail gas in benzophenone according to claim 5, is characterized in that: the lower inner wall of described phosgene purifying column is also provided with the fan blade to blowing up.
7. the treating apparatus for the preparation of tail gas in benzophenone according to claim 6, is characterized in that: described alkali neutralising arrangement is rectangular channel, and the inwall junction of rectangular channel is arc-shaped transition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520750907.XU CN205055791U (en) | 2015-09-25 | 2015-09-25 | A processing apparatus for preparing tail gas among benzophenone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520750907.XU CN205055791U (en) | 2015-09-25 | 2015-09-25 | A processing apparatus for preparing tail gas among benzophenone |
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| Publication Number | Publication Date |
|---|---|
| CN205055791U true CN205055791U (en) | 2016-03-02 |
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| GR01 | Patent grant |