CN215102614U - Benzene acetonitrile tail water recovery processing system - Google Patents
Benzene acetonitrile tail water recovery processing system Download PDFInfo
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- CN215102614U CN215102614U CN202120544896.5U CN202120544896U CN215102614U CN 215102614 U CN215102614 U CN 215102614U CN 202120544896 U CN202120544896 U CN 202120544896U CN 215102614 U CN215102614 U CN 215102614U
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Abstract
The utility model provides a benzene acetonitrile tail water recovery processing system, include tail water pretreatment of water unit, absorption analytic unit, separation element and the fraction recovery unit that sets gradually according to process steps. Carry out tail water preliminary treatment before benzyl cyanide tail water treatment, make the organic component in the tail water obtain the concentration, greatly reduced tail water processing system's processing pressure, the concentrate adsorbs with high temperature through the low temperature of adsorbing analytic unit, the extraction of organic component in the tail water has been realized, the separating action of separating element again, organic high boiling thing, preceding fraction and the effective separation and the recovery of finished product in the benzyl cyanide tail water have been realized, the technical problem that benzyl cyanide tail water COD is too high among the prior art, the processing difficulty, the peculiar smell is great is solved, the yield of benzyl cyanide product has been improved.
Description
Technical Field
The utility model belongs to the technical field of chemical industry equipment, especially, relate to a benzene acetonitrile tail water recovery processing system.
Background
The phenylacetonitrile is an important organic synthesis raw material, is a main raw material in the synthesis of effective components such as phenylacetic acid, phenethylamine, diphenylacetonitrile, alpha-phenylacetamide, ethyl phenylacetate, beta-phenethyl alcohol, phenylacetaldehyde, o-ethylbenzene benzoic acid, alpha-chloro-phenylacetic acid ethyl ester and the like serving as intermediates of medicines and pesticides, the demand of the phenylacetonitrile is increased year by year along with the development of medical treatment and agriculture, but a large amount of tail water is generated in the production of the phenylacetonitrile.
The tail water of the phenylacetonitrile has the characteristics of high COD (Chemical Oxygen Demand), high salt and heavy peculiar smell, contains a large amount of unseparated phenylacetonitrile and also contains virulent components such as cyanide, and the tail water is directly discharged without being treated, so that unexpected disasters are brought to the ecological environment while the loss of the phenylacetonitrile is caused.
However, as the COD content in the phenylacetonitrile tail water is too high, the treatment difficulty and the cost are difficult problems for enterprises, and with the increasingly fierce industry competition and the increasingly severe environmental protection situation, how to recover and treat the phenylacetonitrile in the tail water and change waste into valuable and reduce the treatment cost of the phenylacetonitrile tail water becomes a focus of research and attention in the phenylacetonitrile industry more and more.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a benzene acetonitrile tail water recovery processing system aims at reducing the COD content of treating the tail water through organic matters such as recovery benzene acetonitrile, retrieves partial benzene acetonitrile simultaneously.
In order to achieve the above object, the utility model adopts the following technical scheme:
a benzene acetonitrile tail water recovery processing system comprises a tail water pretreatment unit, an adsorption and desorption unit, a separation unit and a fraction recovery unit which are sequentially arranged according to the process steps;
the tail water pretreatment unit comprises an evaporation concentration device and a concentrated solution storage tank which are sequentially connected, wherein the evaporation concentration device is used for evaporating organic matters and part of water in tail water, and the obtained concentrated solution enters the concentrated solution storage tank;
the adsorption and desorption unit comprises a resin adsorption column, a desorption liquid condenser and a desorption liquid receiving tank which are sequentially connected with the outlet of the concentrated liquid storage tank; the resin adsorption column is used for adsorbing organic matters in the concentrated solution, and a concentrated solution inlet, an adsorbed solution outlet, an analytic solvent inlet and an analytic solution outlet are respectively arranged on a column body of the resin adsorption column; the analysis liquid condenser is used for condensing and recovering analysis liquid and is connected with the analysis liquid outlet;
the separation unit comprises a heating tower kettle, a rectifying tower and an extraction condenser, wherein the heating tower kettle, the rectifying tower and the extraction condenser are connected with an outlet of the analytic liquid receiving tank, a waste liquid discharge port is arranged at the top of the heating tower kettle and at the bottom of the gas outlet connected with the rectifying tower, and the extraction condenser is provided with an inlet connected with an extraction port of the rectifying tower and an outlet connected with the fraction recovery unit.
In one embodiment, the fraction recovery unit comprises a first fraction receiving tank and a second fraction receiving tank, the first fraction receiving tank and the second fraction receiving tank being connected to the production condenser by a first conduit; and a temperature sensor is arranged in the first pipeline and used for detecting the temperature of the distillate, analyzing gas phase components, determining the flow direction of the distillate and recovering effective components in the distillate.
In one embodiment, an overhead condenser and a distributor are arranged in a tower body of the rectifying tower, and the overhead condenser and the distributor are used for realizing gas-liquid separation, reflux and collection of part of liquid substances of multi-component substances in the tower body.
In one embodiment, the resin filled in the resin adsorption column is nonpolar resin, and the desorption solvent is one or more of methanol, ethanol, water or high-temperature steam.
In one embodiment, a vacuum system is further arranged in the phenylacetonitrile tail water recovery processing system, vacuum interfaces are respectively arranged at the tops of the tower top condenser, the first fraction receiving tank and the second fraction receiving tank, the vacuum interfaces are connected with a main pipeline of the vacuum system, and the absolute pressure of the system is not greater than 10 kPa.
The utility model provides a benzyl cyanide tail water recovery processing system's beneficial effect lies in: the embodiment of the utility model provides a benzene acetonitrile tail water recovery processing system has carried out tail water preliminary treatment before benzene acetonitrile tail water treatment, organic composition in making the tail water has obtained the concentration, greatly reduced tail water processing system's processing pressure, the concentrate adsorbs the cryosorption and the high temperature is analytic through adsorbing analytic unit, the extraction of organic composition in the tail water has been realized, the separating action through the separating element, organic high boiling thing in the benzene acetonitrile tail water has been realized, preceding fraction and off-the-shelf effective separation and recovery, it is too high to have solved benzene acetonitrile tail water COD among the prior art, the processing difficulty, the great technical problem of peculiar smell, the yield of benzene acetonitrile product has been improved. The device in the utility model is equipment commonly used, simple structure, and the cost is lower, has very high practicality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the embodiments or the drawings required in the prior art, and obviously, the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a processing system according to an embodiment of the present invention;
wherein, in the figures, the respective reference numerals:
10-tail water pretreatment unit, 11-evaporation concentration device, 12-concentrated solution storage tank; 20-adsorption and desorption unit, 21-resin adsorption column, 22-desorption liquid condenser, and 23-desorption liquid receiving tank; 30-separation unit, 31-heating tower kettle, 32-rectifying tower, 33-extraction condenser, 34-tower top condenser and 35-distributor; 40-fraction recovery unit, 41-first fraction receiving tank, 42-second fraction receiving tank.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, a system for recycling and treating benzyl cyanide tail water provided by the present invention will now be described. The system for recovering and treating the phenylacetonitrile tail water in the embodiment comprises a tail water pretreatment unit 10, an adsorption and desorption unit 20, a separation unit 30 and a fraction recovery unit 40 which are sequentially arranged according to process steps.
In this embodiment, the tail water pretreatment unit 10 includes an evaporation concentration device 11 and a concentrated solution storage tank 12, which are connected in sequence, where the evaporation concentration device 11 is configured to evaporate organic matters and part of water in the tail water, and the obtained concentrated solution enters the concentrated solution storage tank 12; the adsorption and desorption unit 20 comprises a resin adsorption column 21, a desorption liquid condenser 22 and a desorption liquid receiving tank 23 which are sequentially connected with the outlet of the concentrated solution storage tank 12; the resin adsorption column 21 is used for adsorbing organic matters in the concentrated solution, and a concentrated solution inlet, an adsorbed solution outlet, an analytic solvent inlet and an analytic solution outlet are respectively arranged on the column body of the resin adsorption column 21; the analysis liquid condenser 22 is used for condensation and recovery of analysis liquid and is connected with the analysis liquid outlet; the separation unit 30 comprises a heating tower kettle 31, a rectifying tower 32 and an extraction condenser 33 which are connected with an outlet of the analysis liquid receiving tank 23, wherein the top of the heating tower kettle 31 is provided with a gas outlet connected with the rectifying tower 32, the bottom of the heating tower kettle 31 is provided with a waste liquid outlet, and the extraction condenser 33 is provided with an inlet connected with an extraction outlet of the rectifying tower 32 and an outlet connected with the fraction recovery unit 40.
According to the technical scheme, the phenylacetonitrile tail water to be treated is transferred to the evaporation concentration device 11, effective components with low boiling point, such as phenylacetonitrile and the like, and a small amount of water are evaporated out of the system, evaporated substances are condensed and enter the concentrated solution recovery tank 12 as concentrated solution, the concentrated solution in the concentrated solution recovery tank 12 is pumped into the resin adsorption column 21 for low-temperature adsorption, organic matters in the concentrated solution are adsorbed, and residual water is discharged from a solution outlet after adsorption to the resin adsorption column 21 and enters the sewage treatment system. After being resolved by a resolving solvent, the resin adsorption column 21 with saturated adsorption is condensed in a resolving liquid condenser 22 to obtain resolving liquid, the obtained resolving liquid is enriched and stored in the resolving liquid receiving tank 23, then flows into the heating tower kettle 31 for heating and rectification, the heated steam enters a rectifying tower 32, is separated by the rectifying tower 32, enters the extraction condenser 33 from an extraction outlet of the rectifying tower 32 for condensation, and then enters the fraction recovery unit 40.
The embodiment of the utility model provides a benzene acetonitrile tail water recovery processing system has carried out tail water preliminary treatment before benzene acetonitrile tail water treatment, organic composition in making the tail water has obtained the concentration, greatly reduced tail water processing system's processing pressure, the concentrate adsorbs the cryosorption and the high temperature is analytic through adsorbing analytic unit, the extraction of organic composition in the tail water has been realized, the separating action through the separating element, organic high boiling thing in the benzene acetonitrile tail water has been realized, preceding fraction and off-the-shelf effective separation and recovery, it is too high to have solved among the prior art benzene acetonitrile tail water COD, the processing difficulty, the great technical problem of peculiar smell, the yield of benzene acetonitrile product has been improved.
In this embodiment, the fraction recovery unit 40 includes a first fraction receiving tank 41 and a second fraction receiving tank 42, the first fraction receiving tank 41 and the second fraction receiving tank 42 are connected to the extraction condenser 33 through a first pipeline, and a temperature sensor is disposed in the first pipeline and used for detecting the temperature of the distillate. The first pipeline is also connected with a first branch and a second branch, the first branch and the second branch are respectively communicated with a first fraction receiving tank 41 and a second fraction receiving tank 42, and according to the temperature of the distillate, the control system determines that the distillate enters the first fraction receiving tank 41 or the second fraction receiving tank 42. Wherein the main components of the front fraction are substances such as analysis medium, benzyl alcohol and benzaldehyde, and the main component of the back fraction is benzyl cyanide to be recovered.
As a modified example, in order to realize the gas-liquid separation, reflux and collection of part of liquid substances of the multi-component substances, an overhead condenser 34 and a distributor 35 are arranged in the tower body of the rectifying tower.
In order to improve the adsorption effect and adsorption efficiency of benzyl cyanide in the concentrated solution, the adsorption resin filled in the resin adsorption column 21 is nonpolar resin, and the used desorption solvent is one or more of methanol, ethanol, water or high-temperature steam.
In order to make the effective components in the phenylacetonitrile tail water enter the concentrated solution as much as possible, the evaporation concentration device 11 adopts a multi-effect evaporator.
In this embodiment, in order to prevent corrosive impurity components in the benzyl cyanide solution from corroding equipment at high temperature, the heating tower 31 is of an intermittent type, and the heating tower 31, the rectifying tower 32 and the tower top condenser 34 are made of corrosion-resistant enamel materials.
In the embodiment, in order to effectively separate phenylacetonitrile from the front fraction and intercept and reflux high-boiling residues into the heating tower kettle 31, the rectifying tower 32 is a packed tower, the packing in the tower is ceramic corrugated structured packing, and the height of the packing is 8-10 m.
Please refer to fig. 1, which is a specific embodiment of the present invention, for preventing deterioration of the product in the rectification process under the high temperature condition, the system for recovering and processing phenylacetonitrile tail water is further provided with a vacuum system, the tops of the rectification tower top condenser 34, the first fraction receiving tank 41 and the second fraction receiving tank 42 are respectively provided with a vacuum interface, and are connected to the main pipeline of the vacuum system through the vacuum interface, so as to keep the absolute pressure of the analytic liquid in the system in the rectification process not greater than 10 kPa.
In summary, the following describes the operation flow of the present application with a specific embodiment:
introducing phenylacetonitrile 1000m3 with cyanide content of 0.2mg/L and COD index of 3000mg/L into a multi-effect evaporator, evaporating effective components such as phenylacetonitrile with lower boiling point and a small amount of water to separate from a system, condensing the separated concentrated solution containing phenylacetonitrile products, then feeding the condensed solution into a concentrated solution storage tank 12, wherein the COD of the obtained concentrated solution is 2800mg/L, treating the concentrated solution in the concentrated solution storage tank 12 by a resin adsorption column 21 through low-temperature adsorption treatment, then discharging the system, wherein the COD in the concentrated solution discharged from the system is 180mg/L, desorbing the resin with saturated adsorption by a desorption medium, then condensing the desorbed solution in a desorption liquid condenser 22 to obtain a desorption solution, wherein the COD of the desorption solution is 350000mg/L, enriching and storing the obtained desorption solution in a desorption solution receiving tank 23, then feeding the desorption solution into an intermittent heating tower for heating and rectification, condensing the previous fraction by an extraction condenser 33, then feeding the previous fraction into a first fraction receiving tank 41, when the gas phase content of phenylacetonitrile in the line reaches 97%, the fraction is switched to flow into the second fraction-receiving tank 42. 1000kg of high-quality benzyl cyanide product is finally recovered, the content of the recovered product is 99.3%, and the treatment pressure of a biochemical system is greatly reduced while the benzyl cyanide product is recovered.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A benzene acetonitrile tail water recovery processing system is characterized by comprising a tail water pretreatment unit, an adsorption and desorption unit, a separation unit and a fraction recovery unit which are sequentially arranged according to process steps;
the tail water pretreatment unit comprises an evaporation concentration device and a concentrated solution storage tank which are sequentially connected, wherein the evaporation concentration device is used for evaporating organic matters and part of water in tail water, and the obtained concentrated solution enters the concentrated solution storage tank;
the adsorption and desorption unit comprises a resin adsorption column, a desorption liquid condenser and a desorption liquid receiving tank which are sequentially connected with the outlet of the concentrated liquid storage tank; the resin adsorption column is used for adsorbing organic matters in the concentrated solution, and a concentrated solution inlet, an adsorbed solution outlet, an analytic solvent inlet and an analytic solution outlet are respectively arranged on a column body of the resin adsorption column; the analysis liquid condenser is used for condensing and recovering analysis liquid and is connected with the analysis liquid outlet;
the separation unit comprises a heating tower kettle, a rectifying tower and an extraction condenser, wherein the heating tower kettle, the rectifying tower and the extraction condenser are connected with an outlet of the analytic liquid receiving tank, a gas outlet and a waste liquid outlet are formed in the top and the bottom of the heating tower kettle, the gas outlet and the bottom are connected with the rectifying tower, and the extraction condenser is provided with an inlet connected with an extraction outlet of the rectifying tower and an outlet connected with the fraction recovery unit.
2. The phenylacetonitrile tail water recovery processing system of claim 1, wherein the fraction recovery unit comprises a first fraction receiving tank and a second fraction receiving tank, the first fraction receiving tank and the second fraction receiving tank are connected with the production condenser through a first pipeline; and a temperature sensor is arranged in the first pipeline.
3. The benzyl cyanide tail water recovery and treatment system of claim 1, wherein a tower top condenser and a distributor are arranged in a tower body of the rectifying tower, and the tower top condenser and the distributor are used for gas-liquid separation and reflux of multi-component substances in the tower body and collection of partial liquid substances.
4. The benzyl cyanide tail water recovery and treatment system of claim 1, wherein the resin filled in the resin adsorption column is nonpolar resin, and the desorption solvent is one or more of methanol, ethanol, water or high-temperature steam.
5. The benzyl cyanide tail water recovery and treatment system of claim 1, wherein the evaporation and concentration device is a multi-effect evaporator.
6. The phenylacetonitrile tail water recovery processing system of claim 1, wherein the heating tower kettle adopts a batch mode.
7. The benzyl cyanide tail water recovery and treatment system of claim 1, wherein the heating tower kettle, the rectifying tower or the extraction condenser is made of enamel.
8. The benzyl cyanide tail water recovery and treatment system of claim 1, wherein the rectification column is a packed column, the packing in the column is ceramic corrugated structured packing, and the height of the packing is 8-10 m.
9. The phenylacetonitrile tail water recovery processing system of claim 3, wherein the phenylacetonitrile tail water recovery processing system is further provided with a vacuum system, the top of the rectifying tower top condenser, the top of the first fraction receiving tank and the top of the second fraction receiving tank are further respectively provided with a vacuum interface, the vacuum interfaces are connected with a main pipeline of the vacuum system, and the absolute pressure of the system is not more than 10 kPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120544896.5U CN215102614U (en) | 2021-03-16 | 2021-03-16 | Benzene acetonitrile tail water recovery processing system |
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| CN202120544896.5U CN215102614U (en) | 2021-03-16 | 2021-03-16 | Benzene acetonitrile tail water recovery processing system |
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