CN214973001U - Tail gas clean system that produces in copper phthalocyanine production process - Google Patents
Tail gas clean system that produces in copper phthalocyanine production process Download PDFInfo
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- CN214973001U CN214973001U CN202022879441.7U CN202022879441U CN214973001U CN 214973001 U CN214973001 U CN 214973001U CN 202022879441 U CN202022879441 U CN 202022879441U CN 214973001 U CN214973001 U CN 214973001U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The utility model relates to a tail gas purification system, which is suitable for treating tail gas generated in the production process of copper phthalocyanine and can simultaneously remove ammonia gas in the tail gas and alkylbenzene serving as a solvent, and comprises an absorption tower for neutralizing the ammonia gas, a heat exchanger for condensation and a high-strength filler absorption tower for recovering alkylbenzene; the operation method of the system comprises the steps of neutralizing ammonia gas in tail gas by acid, condensing the neutralized tail gas, feeding the condensed tail gas into a high-strength filler absorption tower, and discharging the treated tail gas. Adopt the utility model discloses a system can the ammonia in the effective absorption tail gas for the tail gas of emission accords with the environmental protection requirement, can effectively recycle alkylbenzene, thereby can make the alkylbenzene as the solvent obtain recycling.
Description
Technical Field
The utility model relates to a tail gas clean-up field, particularly, this application relates to the clean-up system and the purification method of the tail gas that produces in the copper phthalocyanine production process.
Background
Copper phthalocyanine of formula C32H16CuN8The compound is a macrocyclic compound, is a pigment with various excellent performances, and plays an important role in organic pigments. The phthalic anhydride-urea method is a commonly used industrial preparation method of copper phthalocyanine, and CN109504120A discloses a clean production method of high-purity copper phthalocyanine, which comprises the following specific processes: and (2) putting alkylbenzene into a condensation tank, heating to the temperature of 125-.
The copper phthalocyanine generates a large amount of ammonia gas in the synthesis process, so that the tail gas discharged by the copper phthalocyanine synthesis process contains a large amount of ammonia gas, water vapor, carbon dioxide and other gases, alkylbenzene used as a solvent has certain volatility, and the tail gas also contains a large amount of alkylbenzene under the reaction pressure. With the improvement of environmental awareness, the trend of environmental regulations and the demand for recycling, ammonia gas, alkylbenzene and the like in tail gas need to be removed before the tail gas is discharged into the atmosphere, so that the tail gas can be purified on one hand, and valuable substances can be recycled on the other hand.
SUMMERY OF THE UTILITY MODEL
However, in the prior art, there are two main methods for treating the exhaust gas generated in the production process of copper phthalocyanine: one is acid-base absorption and condensation and absorption technology, and the other is acid-base absorption and heat storage incineration technology; both methods have significant defects and cannot meet the requirements of environmental protection and energy conservation at present. For the first method, no matter what adsorption mode is adopted, solid waste is newly added in the operation process, secondary pollution is caused, and the method is mainly suitable for purifying VOC with lower concentration; for the second method, the copper phthalocyanine tail gas contains a large amount of water vapor and carbon dioxide gas, which is not beneficial to heat storage incineration, if the route is adopted, a large amount of water vapor and carbon dioxide in the tail gas system must be greatly reduced, and a large amount of investment is increased, so that alkylbenzene to be recovered cannot be reused after heat storage incineration, resource waste is caused, the equipment investment is large, the operating cost is high, and the method is not economical; both methods use acid and alkali for absorption, the diluted acid and alkali salt mother liquor generated after excessive acid and alkali absorption can increase the difficulty and cost of sewage treatment, and after treatment, the quality of the recycled alkylbenzene can not be ensured even if the alkylbenzene is condensed again, so that the difficulty of recycling is increased.
In order to solve the problems existing in the prior art, the utility model provides a tail gas purification system which can simultaneously remove ammonia gas and recover alkylbenzene.
The utility model provides a tail gas clean system that is arranged in multicomponent that copper phthalocyanine production process produced, it is including the absorption tower that is used for neutralization ammonia for the two-stage heat exchanger of condensation and the filler absorption tower that is used for retrieving alkylbenzene, wherein the two-stage heat exchanger includes box heat exchanger and gas-liquid heat exchanger.
Preferably, according to the above exhaust gas purification system, the box-type heat exchanger is a first-stage heat exchanger, and the gas-liquid heat exchanger is a second-stage heat exchanger.
Preferably, according to the above exhaust gas purifying system, wherein the box type heat exchanger is made of 316L stainless steel.
Preferably, according to the above exhaust gas purification system, the heat exchange tube in the gas-liquid heat exchanger is an "octagonal" fin heat exchange tube.
Preferably, according to the above exhaust gas purification system, wherein the gas-liquid heat exchanger is made of 2205 dual-phase steel.
Preferably, according to the above exhaust gas purification system, the two-stage heat exchangers for condensation each use an aqueous solution containing ethylene glycol as a coolant.
Adopt the utility model discloses a system can the ammonia in the effective absorption tail gas for the tail gas of emission accords with the environmental protection requirement, can effectively recycle alkylbenzene, thereby can make the alkylbenzene as the solvent obtain recycling.
Drawings
Fig. 1 is a general schematic diagram of the present invention.
Fig. 2 is a cross-sectional view of a heat exchange tube in the gas-liquid heat exchanger of the present invention.
The system comprises a box-type cooler, a gas-liquid heat exchanger, a high-strength packed tower, a refrigerating unit, a fully welded heat exchanger, a cooling water circulating pump, a packed tower circulating pump and a circulating tank, wherein the box-type cooler is 1, the gas-liquid heat exchanger is 2, the high-strength packed tower is 3, the refrigerating unit is 4, the fully welded heat exchanger is 5, the cooling water circulating pump is 6, the packed tower circulating pump is 7, and the circulating tank is 8.
Detailed Description
The utility model relates to a tail gas clean-up system and tail gas clean-up method, particularly, this system and method are applicable to the tail gas of handling production in the copper phthalocyanine production process, can desorption ammonia in the tail gas simultaneously and the alkylbenzene as the solvent to make tail gas just arrange the atmosphere after purifying in.
First, the utility model provides a tail gas clean system for producing in copper phthalocyanine production process, this system is including the absorption tower that is used for the neutralization ammonia for the heat exchanger of condensation, and the high strength filler absorption tower that is used for retrieving alkylbenzene. A what be used for the absorption tower of neutralization ammonia uses is ordinary absorption tower (not shown in the picture), is used for the heat exchanger of condensation to be in the utility model discloses in adopt two kinds of stage heat exchangers, first section uses box heat exchanger, and the gas-liquid heat exchanger is used to the second section the utility model discloses an in the system, because alkylbenzene has corrosivity, so the utility model discloses an in the system, condensation equipment all adopts special material preparation, and box heat exchanger is made by 316L stainless steel, and gas-liquid heat exchanger is made by 2205 duplex steel, and in order to improve heat exchange efficiency, the heat exchange tube among the gas-liquid heat exchanger adopts the utility model discloses special design's "octagonal" fin heat exchange tube (as shown in figure 2).
The utility model discloses utilize above-mentioned clean system to purify the method of the tail gas that produces in the copper phthalocyanine production process, it includes: neutralizing ammonia gas in the tail gas by acid; condensing the neutralized tail gas; the tail gas after will passing through the condensation supplies high strength filler absorption tower, exhaust after the processing, its characterized in that: the ammonia is neutralized with an acid in an absorber for neutralizing ammonia, the acid being used in an amount such that the off-gas leaving the absorber is weakly alkaline.
The above exhaust gas purification method, wherein the acid for neutralizing ammonia gas is dilute sulfuric acid.
The method for purifying off-gas, wherein the pH of the off-gas leaving the absorption tower is 8.
According to the tail gas purification method, two-section condensation is carried out on the tail gas leaving the absorption tower, the first section of condensation adopts a box type heat exchanger to carry out primary condensation by a water-cooled wall method, and the second section of condensation adopts a gas-liquid heat exchanger to carry out thorough condensation.
In the method for purifying the tail gas, the temperature of the cooling water used for the condensation in the first stage is lower than 0 ℃.
The method for purifying tail gas, wherein the temperature of the cooling water used for the condensation in the first stage is-3 ℃.
In the method for purifying the tail gas, the temperature of the cooling water used for the condensation in the second stage is lower than 0 ℃.
In the method for purifying exhaust gas, the temperature of the cooling water used for the second stage condensation is-3 ℃.
The method for purifying exhaust gas, wherein the cooling water is an aqueous solution containing 20 wt% of ethylene glycol.
The utility model discloses the people discovers after long-term research, when handling tail gas with acid, if the acid quantity is too big, although the effect of neutralization ammonia is fine, but, excessive acid can influence the quality of the alkylbenzene of retrieving in the follow-up processing to can lead to the serious corruption of follow-up processing equipment, ammonia and alkylbenzene in order to can the desorption tail gas simultaneously, and guarantee that the quality of the alkylbenzene of retrieving makes it can retrieve and recycle, the utility model discloses the people surprisingly discovers, when in the absorption tower that is arranged in neutralization ammonia with acid with ammonia, reduces the quantity of acid, makes the tail gas that leaves the absorption tower be weak alkaline and this problem can be solved to follow-up adoption segmentation processing mode. Therefore, the purification system of the present invention calculates the amount of acid for the content of ammonia in the tail gas, so that the absorbed tail gas is weakly alkaline, for example, the pH value of the tail gas is 8, there is no limitation on the kind of acid, the acid commonly used for absorbing ammonia gas can be either single acid or mixed acid, most typically dilute sulfuric acid is used, the concentration of the dilute sulfuric acid is not limited, and dilute sulfuric acid is recommended for preventing corrosion. The tail gas that leaves the absorption tower gets into the condensation stage, at the condensation stage, the utility model discloses a two sections condensation methods, first section condensation adopt box heat exchanger to carry out the preliminary condensation of water-cooling wall method, and second section condensation adopts gas-liquid heat exchanger to carry out thorough condensation. Both cooling steps are carried out using an aqueous solution containing 20 wt% ethylene glycol, both at a temperature below 0 deg.C, and which may range from-3 deg.C to 0 deg.C, and may be, for example, -3 deg.C. Feeding the condensed tail gas into a high-strength filler absorption tower, and recovering alkylbenzene by adopting a deep cold water circulating liquid and a high-flow washing absorption technology.
Examples
The temperature of the tail gas after the primary acid neutralization is about 90-120 ℃, and the gas amount is about 17000m3H, the pH value is about 8, the solution containing ammonium sulfate enters an ammonia water recovery system to recover ammonia water, the tail gas after primary neutralization enters a box type cooler 1 (shown in figure 1), deep cooling is carried out by using an aqueous solution containing 20 wt% of glycol at the temperature of-3 ℃, the temperature of the tail gas is reduced to 35 ℃, meanwhile, a small amount of large particle impurities contained in the waste gas are precipitated in a box body, the box body adopts an S-shaped guide plate and a water-cooled wall type cooling mode, the gas velocity of the tail gas in the box body is less than 0.5m/S, and the retention time is more than 10S; the gas is discharged from the box type cooler and then passes through a finned gas-liquid heat exchanger 2, and the gas is obtained by using the gas containing 20 wt% of glycol at the temperature of-3 DEG CThe water solution is completely deep-frozen, the temperature can be reduced to 7-9 ℃, and most of alkylbenzene is condensed and separated out under the action of temperature reduction; returning the alkylbenzene condensed and separated out from the box-type cooler to a workshop alkylbenzene storage tank for direct reuse. Cooling water is supplied by a refrigerating unit 4 and a cooling water circulating pump 6, a heat exchange tube of a fin gas-liquid heat exchanger 2 is an octagonal fin, the heat exchange effect of the structure is higher, the material is 2205 dual-phase steel, gas out of the finned tube heat exchanger 2 enters a high-strength packed tower 3 to be sprayed, cooled and absorbed, spraying liquid comes from process water in a circulating tank 8, the gas from the finned tube is cooled and absorbed by using a fully welded heat exchanger 5 through a packed tower circulating pump 7, finally, residual alkylbenzene (containing a small amount of non-condensable gas) and ammonia gas are returned to the circulating tank 8 through the spraying liquid to be collected, an overflow pipe is arranged at the upper part of the circulating tank 8, and in the circulating cooling and absorbing processes of the spraying liquid, as the concentration of ammonia water in the liquid is gradually increased, more and more alkylbenzene is collected, the process water is periodically supplemented, the concentration of the spraying liquid ammonia water is reduced, and the redundant circulating liquid returns to a workshop through the overflow pipe to be comprehensively utilized, the alkylbenzene is lighter than water and mainly attached above the liquid level, the alkylbenzene produced after overflow is completely recovered and reused, in the high-strength filler absorption tower 3, the filler layer is more than 4000mm, the tower diameter is 3000mm, and the circulation quantity is 120m3H, the temperature of the circulating liquid is about 5 ℃, and the temperature of the circulating liquid discharged from the tower is 9-13 ℃.
The tail gas enters the system, the ammonia gas content is more than 2000mg/m3After treatment<200mg/m3(ii) a When the system and the method are not adopted, the unit consumption of the alkylbenzene is 65 kg/ton product, and the unit consumption of the alkylbenzene after the system and the method are adopted is 35.1 kg/ton product.
Therefore, by adopting the system and the method of the utility model, the ammonia in the tail gas can be effectively absorbed, the alkylbenzene can be effectively recycled, and the equipment corrosion can be effectively prevented due to the adoption of special materials.
Although the system and method of the present invention are specifically designed for treating the exhaust gas generated during the production of copper phthalocyanine, it is obvious that the system and method of the present invention can be applied to the treatment of all exhaust gas containing ammonia and volatile solvents as well, as can be understood by those skilled in the art. Therefore, the present application is only illustrative of one of the situations, and the present invention can be modified and changed without departing from the principles and spirit of the present invention, and the modifications and changes are all within the protection scope of the present invention.
Claims (8)
1. A tail gas purification system for copper phthalocyanine production is characterized by comprising an absorption tower for neutralizing ammonia gas, a two-stage heat exchanger for condensation and a filler absorption tower for recovering alkylbenzene, wherein the two-stage heat exchanger comprises a box-type heat exchanger and a gas-liquid heat exchanger.
2. The exhaust gas purification system according to claim 1, wherein the box heat exchanger is a first stage heat exchanger and the gas-liquid heat exchanger is a second stage heat exchanger.
3. The exhaust gas purification system according to claim 2, wherein the box heat exchanger is made of 316L stainless steel.
4. The exhaust gas purification system according to claim 3, wherein the heat exchange tubes in the gas-liquid heat exchanger are "octagonal" fin heat exchange tubes.
5. The exhaust gas purification system according to claim 2, wherein the heat exchange tubes in the gas-liquid heat exchanger are "octagonal" fin heat exchange tubes.
6. The exhaust gas purification system according to claim 2, wherein the gas-liquid heat exchanger is made of 2205 dual-phase steel.
7. The exhaust gas purification system according to claim 4, wherein the gas-liquid heat exchanger is made of 2205 dual-phase steel.
8. The exhaust gas purification system according to any one of claims 1 to 7, wherein the secondary heat exchangers for condensation each use an aqueous solution containing ethylene glycol as a cooling liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022879441.7U CN214973001U (en) | 2020-12-03 | 2020-12-03 | Tail gas clean system that produces in copper phthalocyanine production process |
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| CN202022879441.7U CN214973001U (en) | 2020-12-03 | 2020-12-03 | Tail gas clean system that produces in copper phthalocyanine production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112657326A (en) * | 2020-12-03 | 2021-04-16 | 宣城亚邦化工有限公司 | Purification system and purification method for tail gas generated in copper phthalocyanine production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112657326A (en) * | 2020-12-03 | 2021-04-16 | 宣城亚邦化工有限公司 | Purification system and purification method for tail gas generated in copper phthalocyanine production process |
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Address after: 242000 No.70, Beimen Industrial Road, Xuancheng City, Anhui Province Patentee after: Anhui Shenlanhua Color Material Co.,Ltd. Address before: 242000 No.70, Beimen Industrial Road, Xuancheng City, Anhui Province Patentee before: Anhui shenlanhua color material Co.,Ltd. |