CN112957773A - Styrene-butadiene latex degassing device and degassing method - Google Patents
Styrene-butadiene latex degassing device and degassing method Download PDFInfo
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- CN112957773A CN112957773A CN202110182869.2A CN202110182869A CN112957773A CN 112957773 A CN112957773 A CN 112957773A CN 202110182869 A CN202110182869 A CN 202110182869A CN 112957773 A CN112957773 A CN 112957773A
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Abstract
The invention discloses a styrene-butadiene latex degassing device, which comprises a degassing tower, a tower top vacuum system and a tower kettle vacuum system, wherein the tower top vacuum system comprises a condenser gas-phase inlet, a tower top condenser and a liquid receiving tank which are sequentially communicated through a pipeline, the condenser gas-phase inlet is communicated with a tower top gas-phase outlet, and the tower top condenser is connected with a tower top vacuum pump; the tower kettle vacuum system comprises a liquid seal tank and a tower bottom vacuum pump communicated with a gas phase outlet of the liquid seal tank, the pressure in the degassing tower is maintained by controlling the pressure difference between the tower top vacuum pump and the tower bottom vacuum pump, the VOC removing efficiency and the latex yield are increased, the temperature rise of tower bottom steam caused by the overlarge system resistance can be effectively prevented, and the latex skinning is avoided.
Description
Technical Field
The invention relates to the technical field of styrene-butadiene latex production, in particular to a styrene-butadiene latex degassing device and a degassing method.
Background
The styrene-butadiene latex is generally used in the production of paper making, coating and other processes, and is prepared by copolymerizing butadiene and styrene to form carboxylic styrene-butadiene latex and then performing subsequent processing. The styrene-butadiene latex obtained after the reaction usually has a small amount of butadiene and styrene dissolved therein, and the residual monomers are removed by a degassing process. The degassing tower is used to remove residual monomers from the styrene-butadiene latex by introducing saturated steam and then adsorbing and removing styrene and butadiene during the steam volatilization process, thereby separating and removing the residual monomers from the styrene-butadiene latex.
CN211536643U discloses a degassing tower for producing styrene-butadiene latex, which comprises a tower body, wherein a feed inlet is arranged above the tower body, a discharge outlet is arranged below the tower body, a steam inlet and a steam outlet are arranged on the side wall of the tower body, a plurality of guide plates are arranged on the inner wall of the tower body, and the guide plates incline downwards from one side of the connection part of the guide plates and the inner wall of the tower body to one side far away from the inner wall of the tower body. This degasser can make the butylbenzene latex flow down along the guide plate under the action of gravity through setting up the guide plate of downward sloping, is difficult for piling up on the guide plate, and then improves degasser's degasser treatment effeciency.
CN203043633U discloses a novel emulsion polymerized styrene-butadiene rubber degassing tower, which comprises a tower body, wherein the side wall of the tower body is provided with a feeding port, and the top surface of the tower body is provided with an exhaust port; a discharge hole is formed in the bottom surface of the tower body; a steam inlet is formed in the bottom of the side face of the tower body, and a flowmeter is arranged on the steam inlet; a plurality of tower trays are arranged on the inner wall of the tower body in the direction from the feeding port to the tower bottom in parallel, and the tower trays are arranged in a staggered manner; a plurality of tower holes are formed in any tower tray; any tower hole is in an inverted cone shape. The equipment has a simple structure, is simple and convenient to use, can effectively prevent the leakage of the tower tray, ensures the styrene removal efficiency, reduces the chemical oxygen demand in the discharged sewage, reduces the damage of the sewage to the environment, reduces the usage amount of saturated medium-pressure steam in a degassing process, and saves the cost.
However, the styrene-butadiene latex degassing equipment and the process in the prior art have the problems of long degassing time, large product quality fluctuation, high energy consumption, difficult process control and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the styrene-butadiene latex degassing device and the degassing method which can reduce the product quality fluctuation, reduce the skinning phenomenon during degassing and reduce the energy consumption, can effectively improve the product quality and the productivity, reduce the energy consumption and reduce the discharge amount of voc.
In order to achieve the purpose, the invention adopts the following technical scheme:
a styrene-butadiene latex degassing device comprises a degassing tower, a tower top vacuum system communicated with a tower top gas phase outlet at the top end of the degassing tower, and a tower bottom vacuum system communicated with a tower bottom latex outlet at the bottom of the degassing tower;
the main body of the degassing tower is of a cylindrical hollow structure, a plurality of tower trays which are vertical to each other and fixedly connected to the inner wall of the degassing tower are arranged in the degassing tower, the diameter of each tower tray is consistent with the inner diameter of the degassing tower, a plurality of steam outlets are distributed on each tower tray, a notch is formed in one side of each tower tray, the notches of adjacent tower trays are arranged in a staggered mode, a steam inlet is formed in the side wall of the degassing tower below the tower tray at the lowest layer, and a latex inlet is formed in the side wall of the degassing tower above the tower tray at the;
the tower top vacuum system comprises a condenser gas phase inlet, a tower top condenser and a liquid receiving tank which are sequentially communicated through a pipeline, wherein the condenser gas phase inlet is communicated with the tower top gas phase outlet, and the tower top condenser is connected with a tower top vacuum pump;
the tower kettle vacuum system comprises a liquid seal tank, a tower bottom vacuum pump communicated with a liquid seal tank gas phase outlet at the top of the liquid seal tank through a pipeline, and a diaphragm pump communicated with the bottom of the liquid seal tank through a pipeline, wherein the top of the liquid seal tank is connected with a tower bottom latex outlet through a pipeline.
Preferably, the steam outlet is rectangular, and two opposite side edges are provided with a pair of elongated tower plate openings which are inclined or bent upwards.
Preferably, the tower top vacuum pump and the tower bottom vacuum pump are respectively connected with the pressure difference interlocking control device. The pressure difference between the tower top and the tower bottom is monitored and automatically adjusted through a pressure difference interlocking control device. Of course, the vacuum levels at the top and bottom of the column can also be manually adjusted by conventional manual monitoring.
The second aspect of the present invention provides a method for degassing by using the above-mentioned styrene-butadiene latex degassing apparatus, which is characterized by comprising the steps of:
s1, starting a vacuum pump at the top of the tower, and vacuumizing the degassing tower;
s2, opening a steam valve to enable steam to enter a degassing tower through a steam inlet;
s3, opening a feeding valve, enabling the styrene-butadiene latex to flow into a tray through a latex inlet of a degassing tower and to be in contact with steam airflow rising through a steam outlet on the tray to form splash-type bubbling, and transferring VOC in the latex into the steam vapor phase due to lower partial pressure in the vapor phase in the process of contacting the steam with a latex layer;
s4, enabling the styrene-butadiene latex to flow into the next tray after passing through the tray gap, continuously being processed by steam flow passing through the steam outlet of the next tray and carrying away VOC, and sequentially reciprocating to the last tray and then flowing into the bottom of the degassing tower;
s5, opening a vacuum pump at the bottom of the tower, and bringing the degassed styrene-butadiene latex flowing into the bottom of the degassing tower into a liquid seal tank;
s6, keeping the liquid level height of the liquid seal tank at 30-60%, and starting a diaphragm pump to pump away materials when the liquid level height exceeds the liquid level height;
and S7, discharging the vapor phase through a vapor phase outlet at the top of the tower, condensing the vapor phase through a condenser at the top of the tower, and then entering a liquid receiving tank for collection.
Preferably, the vacuum degree is controlled to-0.03 MPa to-0.07 MPa in step S1.
Preferably, in step S5, the pressure difference between the tower top vacuum pump and the tower bottom vacuum pump is controlled to be-0.072 +/-0.003 MPa.
Preferably, the steam contains a small amount of ammonia water, and the addition amount of ammonia water is 1-5kg/m3. A small amount of ammonia water is added into steam entering a degassing tower, so that the latex is in a weak alkaline environment, and the stability of the latex is facilitated.
Compared with the prior art, the invention has the following beneficial effects:
1. the internal pressure of the degassing tower is maintained by increasing a tower kettle vacuum system, the discharging speed of V0C at the top of the tower is reduced, the retention time of VOC in the degassing tower is increased, and the VOC removal efficiency is increased;
2. the vacuum system of the tower kettle is added to maintain the pressure in the degassing tower, so that the latex treatment capacity and treatment speed are increased, the latex carried out by steam is reduced, and the latex yield is increased;
3. the internal pressure of the degassing tower is maintained by adding a tower kettle vacuum system, so that the system can stably run, the liquid level height is effectively controlled, the excessive system resistance is prevented, the temperature of steam at the bottom of the tower is increased, and the latex is skinned.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic diagram of the configuration of a degasser tray of the present invention.
In the figure: the device comprises a degassing tower 1, a degassing tower 101, a latex inlet, a steam inlet, a tray 3, a steam outlet 301, a tray 302 opening, a latex outlet at the bottom of 4 towers, a gas phase outlet at the top of 5 towers, a gas phase outlet at a liquid-sealed tank 6, a vacuum pump at the bottom of 7 towers, a vacuum pump outlet at the bottom of 8 towers, a flooding-preventing baffle 9, a liquid-sealed tank 10, a diaphragm pump 11, a diaphragm pump outlet at the bottom of 12 towers, a liquid receiving tank 13, a condenser at the top of 14 towers, a gas phase inlet at the condenser.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, which are simplified schematic drawings and are intended to illustrate only the basic structure of the present invention in a schematic manner, and thus show only the structures related to the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.
In the description of the present invention, it is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Referring to fig. 1 and 2, a styrene-butadiene latex degassing device comprises a degassing tower 1, an overhead vacuum system communicated with an overhead gas phase outlet 5 at the top end of the degassing tower 1, and a tower kettle vacuum system communicated with a tower bottom latex outlet 4 at the bottom of the degassing tower 1;
the main body of the degassing tower 1 is of a cylindrical hollow structure, six tower trays 3 which are vertical to each other and fixedly connected to the inner wall of the degassing tower 1 are arranged in the degassing tower 1, the diameter of each tower tray 3 is consistent with the inner diameter of the degassing tower 1, a plurality of steam outlets 301 are distributed on each tower tray 3, each steam outlet 301 is rectangular, a pair of strip-shaped tower plate openings 302 which are bent upwards are arranged on two opposite side edges, one side of each tower tray 3 is provided with a notch, the notches of adjacent tower trays are arranged in a staggered mode, a steam inlet 2 is formed in the side wall of the degassing tower below the tower tray 3 at the lowest layer, and a latex inlet 101 is formed in the side;
the tower top vacuum system comprises a condenser gas phase inlet 15, a tower top condenser 14 and a liquid receiving tank 13 which are sequentially communicated through pipelines, wherein the condenser gas phase inlet 15 is communicated with the tower top gas phase outlet 5, and the tower top condenser 14 is connected with a tower top vacuum pump 16, and the model can be 2 XZ-4;
the tower kettle vacuum system comprises a liquid seal tank 10, and a tower bottom vacuum pump 7 which is communicated with a liquid seal tank gas phase outlet 6 at the top of the liquid seal tank 10 through a pipeline, wherein the model of the tower bottom vacuum pump can be WXZ-1; the diaphragm pump 11 is communicated with the bottom of the liquid seal tank 10 through a pipeline, and the model can be QBY-65; the top of the liquid seal tank 10 is connected with the bottom latex outlet 4 through a pipeline.
The method for degassing by adopting the styrene-butadiene latex degassing device comprises the following steps:
s1, starting a tower top vacuum pump 16, and vacuumizing the degassing tower 1, wherein the vacuum degree is controlled to be minus 0.05 +/-0.005 MPa;
s2, opening a steam valve to enable steam to enter the degassing tower 1 through a steam inlet 2;
s3, opening a feeding valve, enabling the styrene-butadiene latex to flow into a tray 3 through a latex inlet 101 of a degassing tower and to be in contact with a steam airflow rising through a steam outlet 301 on the tray 3 to form splash-type bubbling, transferring VOC in the latex into the steam vapor phase due to low partial pressure in the vapor phase in the process of contacting the steam with a latex layer, and forming a liquid layer with the thickness of about 50-80mm on the liquid surface of the tray under the control of negative pressure and airflow;
s4, allowing the styrene-butadiene latex to flow into the next tray after passing through the tray gap, continuously treating the styrene-butadiene latex by the steam flow passing through the steam outlet 301 of the next tray and carrying away VOC, and sequentially reciprocating to the last tray and then flowing into the bottom of the degassing tower;
s5, opening a tower bottom vacuum pump 7, bringing the degassed styrene-butadiene latex flowing into the bottom of the degassing tower into a liquid seal tank 10, controlling the pressure difference between a tower top vacuum pump 16 and the tower bottom vacuum pump 7 to be kept at-0.072 +/-0.003 MPa, monitoring by adopting a conventional manual mode, and manually adjusting the vacuum degrees of the tower top and the tower bottom;
s6, keeping the liquid level height of the liquid seal tank 10 at 30-60%, and starting the diaphragm pump 11 to pump away the material when the liquid level height exceeds the liquid level height;
and S7, discharging the vapor phase through an overhead vapor phase outlet 5, condensing the vapor phase through an overhead condenser 14, and collecting the vapor phase in a liquid receiving tank 13.
Example 2
An anti-flooding baffle 9 is arranged below the gas phase outlet 6 of the liquid seal tank to prevent flooding. The anti-flooding baffle 9 and the vertical central line of the liquid-sealed tank 10 form an included angle of 45 degrees. The rest is the same as example 1.
Example 3
The tower top vacuum pump 16 and the tower bottom vacuum pump 7 are respectively connected with a pressure difference interlocking control device. The pressure difference between the tower top and the tower bottom is monitored and automatically adjusted through a pressure difference interlocking control device. The rest is the same as example 1.
Example 4
The steam contains a small amount of ammonia water, and the addition amount of the ammonia water is 3kg/m of the steam dosage3. The rest is the same as example 1. A small amount of ammonia water is added into steam entering a degassing tower, so that the latex is in a weak alkaline environment, and the stability of the latex is facilitated.
Comparative example 1
A tower top vacuum system and a tower kettle vacuum system are not arranged, and a styrene-butadiene latex degassing tower disclosed in CN203043633U is adopted to carry out degassing treatment on styrene-butadiene latex.
Comparative example 2
The styrene-butadiene latex subjected to degassing treatment at the bottom of the degassing tower is directly collected without a tower bottom vacuum system, steps S5 and S6 are omitted in the degassing method, and other equipment and process methods are the same as those in example 1.
The yields and VOC contents of the styrene-butadiene latexes obtained in example 1 and in comparative examples 1 and 2 were determined (according to the method specified in GB-T25260.1-2010) and the results are shown in Table 1:
TABLE 1 comparison of styrene-butadiene latex yield and VOC content
From the above detection data, it can be seen that, compared with the conventional degassing device without the tower top vacuum system and the tower bottom vacuum system, the degassing device maintains the pressure in the degassing tower by adding the tower bottom vacuum system, so that the VOC removal efficiency can be improved, the latex treatment capacity and treatment speed can be increased, the latex carried away by steam can be reduced, and the latex yield can be increased.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The styrene-butadiene latex degassing device is characterized by comprising a degassing tower (1), a tower top vacuum system communicated with a tower top gas phase outlet (5) at the top end of the degassing tower (1), and a tower bottom vacuum system communicated with a tower bottom latex outlet (4) at the bottom of the degassing tower (1);
the main body of the degassing tower (1) is of a cylindrical hollow structure, a plurality of vertical tower trays (3) fixedly connected to the inner wall of the degassing tower (1) are arranged in the degassing tower (1), the diameter of each tower tray (3) is consistent with the inner diameter of the degassing tower (1), a plurality of steam outlets (301) are distributed on each tower tray (3), one side of each tower tray (3) is provided with a notch, the notches of adjacent tower trays are arranged in a staggered mode, a steam inlet (2) is formed in the side wall of the degassing tower below the tower tray (3) at the lowest layer, and a latex inlet (101) is formed in the side wall of the degassing tower above the tower (3) at the uppermost layer;
the tower top vacuum system comprises a condenser gas phase inlet (15), a tower top condenser (14) and a liquid receiving tank (13) which are sequentially communicated through pipelines, the condenser gas phase inlet (15) is communicated with the tower top gas phase outlet (5), and the tower top condenser (14) is connected with a tower top vacuum pump (16);
the tower bottom vacuum system comprises a liquid seal tank (10), a tower bottom vacuum pump (7) communicated with a liquid seal tank gas phase outlet (6) at the top of the liquid seal tank (10) through a pipeline, and a diaphragm pump (11) communicated with the bottom of the liquid seal tank (10) through a pipeline, wherein the top of the liquid seal tank (10) is connected with a tower bottom latex outlet (4) through a pipeline.
2. The degassing apparatus according to claim 1, wherein the steam outlet (301) is rectangular, and opposite sides are provided with a pair of elongated plate openings (302) which are inclined or curved upward.
3. The degassing apparatus for styrene-butadiene latex according to claim 1, wherein said overhead vacuum pump (16) and said bottom vacuum pump (7) are connected to a differential pressure interlock control device, respectively.
4. A method for degassing styrene-butadiene latex by using the degassing apparatus for styrene-butadiene latex according to any one of claims 1 to 3, comprising the steps of:
s1, starting a tower top vacuum pump (16), and vacuumizing the degassing tower (1);
s2, opening a steam valve to enable steam to enter the degassing tower (1) through a steam inlet (2);
s3, opening a feeding valve, enabling the styrene-butadiene latex to flow into a tray (3) through a latex inlet (101) of a degassing tower and to be in contact with a steam flow rising through a steam outlet (301) on the tray (3) to form splash type bubbling, and enabling VOC in the latex to be transferred into the steam gas phase due to low partial pressure in the gas phase in the process of contacting the steam with a latex liquid layer;
s4, enabling the styrene-butadiene latex to flow into the next tray after passing through the tray gap, continuously being treated by the steam flow passing through the steam outlet (301) of the next tray and carrying away VOC, sequentially reciprocating to the last tray and then flowing into the bottom of the degassing tower;
s5, opening a bottom vacuum pump (7), and bringing the degassed styrene-butadiene latex flowing into the bottom of the degassing tower into a liquid seal tank (10);
s6, keeping the liquid level height of the liquid seal tank (10) at 30-60%, and starting the diaphragm pump (11) to pump away materials when the liquid level height exceeds the liquid level height;
and S7, discharging the vapor phase through an overhead vapor phase outlet (5), condensing the vapor phase through an overhead condenser (14), and then collecting the vapor phase in a liquid receiving tank (13).
5. The method as claimed in claim 4, wherein the vacuum degree is controlled to-0.03 MPa to-0.07 MPa in step S1.
6. The method according to claim 4, wherein the pressure difference between the tower top vacuum pump (16) and the tower bottom vacuum pump (7) is controlled to be-0.072 ± 0.003MPa in step S5.
7. The method of claim 4, wherein the steam contains a small amount of ammonia water, and the amount of ammonia water added is 1-5kg/m3。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113650187A (en) * | 2021-08-09 | 2021-11-16 | 赣州能之光新材料有限公司 | Plastics VOC remove device |
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