Method and system for degassing of rubber solution in rubber production

Abstract

The application discloses a method and system for degassing rubber solution in rubber production and relates to the technical field of chemical industry.The method is characterized in that pure solvent is vaporized by a vaporizer and introduced into a stripping tower from the bottom of the tower to remove light monomers in the rubber solution as the ascending gas phase in the tower; in order to reduce the amount of the solvent condensed by the rubber solution in the stripping tower, a rubber solution preheater is arranged before the stripping tower, and the rubber solution is preheated to a near-saturated state under a pressurized condition; the gas phase at the top of the stripping tower contains light monomers and solvent, and the light monomers are sent to polymerization as raw materials, and the solvent is sent to the vaporizer for recycling by further cooling and rectification separation. The main advantage of the application is that there is no rubber solution reboiler which is easy to coke, the rubber solution degassing system can be operated stably for a long time, the labor intensity is reduced, and raw materials are saved.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and more specifically to a method and system for degassing rubber solutions in rubber production. Background Technology

[0002] Polyolefin elastomers are one of the main development directions of high-end polyolefins. Their special molecular structure endows them with excellent mechanical properties, rheological properties and aging resistance. At the same time, they have the advantages of good affinity with polyolefins, outstanding low-temperature toughness and high cost performance. They can be used as rubber, thermoplastic elastomers, and impact modifiers and toughening agents for plastics. They have become one of the most promising new materials to replace traditional rubber and some plastics, and are widely used in medical packaging materials, automotive parts, daily products and other fields.

[0003] In the polyolefin elastomer manufacturing process, some olefin monomers dissolve in the polymer solution produced by the polymerization reaction. Before the solution enters the gelation process, it needs to be stripped away by a distillation column to remove the olefin monomers. The reboiler prepared for the stripping column has a high temperature, and after some solvent evaporates, the solution concentration is high. Therefore, the reboiler is very prone to coking and clogging, requiring frequent shutdowns for cleaning, which is very difficult and results in the loss of a large amount of process materials. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for degassing rubber solution in rubber production in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] One aspect of the present invention provides a system for degassing latex in rubber production, comprising a stripping tower, a monomer recovery tower, a separation tank, a first cooler, and a second cooler;

[0007] The top side of the stripping tower is connected to the glue collection mechanism from the polymerization section via a glue pipe, and the bottom side of the stripping tower is connected to the replenishing solvent mechanism and the circulating solvent mechanism via a solvent pipe. The top and bottom of the stripping tower are respectively equipped with an air outlet and a liquid outlet.

[0008] The outlet of the stripping tower is connected to the inlet of the first cooler through a pipeline. The condensate outlet of the first cooler is connected to one side of the top of the unit recovery tower. The top and bottom of the unit recovery tower are respectively provided with an outlet and a liquid outlet.

[0009] The outlet of the single recovery tower is connected to a solvent circulation pump through a second circulation pipe. The outlet of the solvent circulation pump is divided into two paths: one path is connected to the top side wall of the stripping tower through a pipeline, and the other path is connected to the solvent pipeline through a pipeline.

[0010] The outlet of the single recovery tower and the uncondensed outlet of the first cooler are both connected to the inlet of the second cooler, and the outlet of the second cooler is connected to the side wall of the separation tank.

[0011] In one embodiment, the top and bottom of the separator are respectively provided with an air outlet and a liquid outlet. The air outlet of the separator is connected to the polymerization section through a pipeline, and the liquid outlet of the separator is connected to the monomer recovery tower through a first circulation pipeline.

[0012] In one embodiment, a reflux pump is provided on the first circulation pipe.

[0013] In one embodiment, an adhesive preheater is provided on the adhesive pipeline.

[0014] In one embodiment, a solvent vaporizer is provided on the solvent pipeline, and another outlet of the solvent circulation pump is connected to the solvent vaporizer via a pipeline.

[0015] In one embodiment, a reboiler is provided at the bottom of the individual recovery tower.

[0016] Another aspect of the present invention provides a method for degassing latex in rubber production, employing the above-described system for degassing latex in rubber production, comprising the following steps:

[0017] S1. The adhesive solution from the polymerization section is heated to near saturation in the adhesive solution preheater under pressure, and then enters the top of the stripping tower; the circulating solvent and a small amount of replenishing solvent are heated and vaporized in the solvent vaporizer and then enter the bottom of the stripping tower; inside the stripping tower, the rising solvent vapor phase comes into countercurrent contact with the falling adhesive solution, vaporizing the light monomers in the adhesive solution, and the vapor phase containing solvent and light monomers is collected from the top of the stripping tower and sent to the first cooler; the adhesive solution with light monomers removed is collected from the bottom of the tower and sent to the downstream process;

[0018] S2. First, in the cooler, some solvent and a small amount of monomer are condensed by circulating water. The condensed liquid phase is sent to the top of the monomer recovery tower. The uncondensed gas phase is mixed with the gas phase at the top of the monomer recovery tower and then enters the second condenser for further cooling with chilled water. Most of the solvent is condensed. The cooled material enters the separator for gas-liquid separation. The separated gas phase is light monomer, which is sent to the polymerization section as raw material. The liquid phase is solvent containing a small amount of monomer, which is pressurized by the reflux pump and then sent to the monomer recovery tower.

[0019] S3. In the monomer recovery tower, the rising gas phase is provided by the reboiler of the recovery tower. The solvent and monomer are separated by distillation. The monomer gas phase with a small amount of solvent at the top of the tower is sent to the second cooler. The liquid phase collected from the bottom of the tower is the solvent. After being pressurized by the solvent circulation pump, it is divided into two paths. One path sends a small amount to the top of the stripping tower as washing liquid, and the other path sends it to the solvent vaporizer for vaporization and recycling.

[0020] Specifically, since a small amount of solvent condenses in the stripping tower and is carried away by the degassed adhesive, a small amount of solvent is added to the solvent vaporizer. Solvent vaporization is used to degassed the adhesive in the stripping tower, eliminating the need for a reboiler. The adhesive is preheated under pressure before entering the stripping tower to increase its temperature, reducing solvent condensation and replenishment. The monomer and solvent mixture undergoes two stages of cooling and partial condensation; the liquid phase is separated from the solvent in the monomer recovery tower. The solvent in the bottom of the monomer recovery tower is recycled, requiring only a small amount of solvent replenishment.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention features a rationally designed degassing process for adhesives without a reboiler. Pure solvent is vaporized via a vaporizer and enters the stripping column from the bottom, serving as the rising vapor phase to remove light monomers from the adhesive. To reduce the amount of solvent condensed in the stripping column, a preheater is installed before the adhesive, preheating it to near saturation under pressure. The vapor phase at the top of the stripping column contains both light monomers and solvent. Further cooling and distillation separate the two components: the light monomers are sent for polymerization as feedstock, while the solvent is recycled back to the vaporizer. The main advantages of this process are the absence of a reboiler prone to coking, allowing for long-term stable operation of the degassing system, reduced labor intensity, and material savings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure reference numerals: C01-Stripping tower, C02-Monopolymer recovery tower, E01-Glue preheater, E02-Solvent vaporizer, E03-First cooler, E04-Second cooler, P01-Solvent circulation pump, P02-Reflux pump, V01-Separation tank. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides 1. a system for degassing rubber solution in rubber production, including a stripping tower CO1, a monomer recovery tower CO2, a separation tank V01, a first cooler E03, and a second cooler E04;

[0032] The top side of the stripping tower C01 is connected to the adhesive collection mechanism from the polymerization section via an adhesive pipe, and the bottom side of the stripping tower C01 is connected to the replenishing solvent mechanism and the circulating solvent mechanism via a solvent pipe. The top and bottom of the stripping tower C01 are respectively provided with an air outlet and a liquid outlet.

[0033] The outlet of the stripping tower C01 is connected to the inlet of the first cooler E03 via a pipe. The condensate outlet of the first cooler E03 is connected to one side of the top of the unit recovery tower C02. The top and bottom of the unit recovery tower C02 are respectively provided with an outlet and a liquid outlet.

[0034] The liquid outlet of the single recovery tower CO2 is connected to the solvent circulation pump P01 through the second circulation pipe. The liquid outlet of the solvent circulation pump P01 is divided into two paths: one path is connected to the top side wall of the stripping tower CO1 through a pipe, and the other path is connected to the solvent pipeline through a pipe.

[0035] The outlet of the single-unit recovery tower CO2 and the uncondensed outlet of the first cooler E03 are both connected to the inlet of the second cooler E04, and the outlet of the second cooler E04 is connected to the side wall of the separation tank V01.

[0036] Example 2

[0037] like Figure 1 As shown, this embodiment provides 1. a system for degassing rubber solution in rubber production, including a stripping tower CO1, a monomer recovery tower CO2, a separation tank V01, a first cooler E03, and a second cooler E04;

[0038] The top side of the stripping tower C01 is connected to the adhesive collection mechanism from the polymerization section via an adhesive pipe, and the bottom side of the stripping tower C01 is connected to the replenishing solvent mechanism and the circulating solvent mechanism via a solvent pipe. The top and bottom of the stripping tower C01 are respectively provided with an air outlet and a liquid outlet.

[0039] The outlet of the stripping tower C01 is connected to the inlet of the first cooler E03 via a pipe. The condensate outlet of the first cooler E03 is connected to one side of the top of the unit recovery tower C02. The top and bottom of the unit recovery tower C02 are respectively provided with an outlet and a liquid outlet.

[0040] The liquid outlet of the single recovery tower CO2 is connected to the solvent circulation pump P01 through the second circulation pipe. The liquid outlet of the solvent circulation pump P01 is divided into two paths: one path is connected to the top side wall of the stripping tower CO1 through a pipe, and the other path is connected to the solvent pipeline through a pipe.

[0041] The outlet of the single-unit recovery tower CO2 and the uncondensed outlet of the first cooler E03 are both connected to the inlet of the second cooler E04, and the outlet of the second cooler E04 is connected to the side wall of the separation tank V01.

[0042] The top and bottom of the separator V01 are respectively provided with an air outlet and a liquid outlet. The air outlet of the separator V01 is connected to the polymerization section through a pipeline, and the liquid outlet of the separator V01 is connected to the monomer recovery tower CO2 through a first circulation pipeline.

[0043] A reflux pump P02 is installed on the first circulation pipeline.

[0044] The adhesive pipeline is equipped with an adhesive preheater E01.

[0045] A solvent vaporizer E02 is installed on the solvent pipeline, and another outlet of the solvent circulation pump P01 is connected to the solvent vaporizer E02 through a pipeline.

[0046] The bottom of the individual recovery tower C02 is equipped with a recovery tower reboiler E05.

[0047] Specifically, this scheme employs a reboiler-free adhesive stripping degassing process. Pure solvent is vaporized via a vaporizer and fed into the stripping column from the bottom, serving as the rising vapor phase to remove light monomers from the adhesive. To reduce the amount of solvent condensed in the stripping column, an adhesive preheater is installed before the stripping column to preheat the adhesive to near saturation under pressure. The vapor phase at the top of the stripping column contains both light monomers and solvent. Further cooling and distillation separate the two components: the light monomers are sent for polymerization as feedstock, while the solvent is recycled back to the vaporizer. The main advantages of this process are the absence of a reboiler prone to coking, allowing the adhesive degassing system to operate stably for extended periods, reducing labor intensity, and conserving raw materials.

[0048] Example 3

[0049] This embodiment provides a method for degassing latex in rubber production, using the aforementioned system for degassing latex in rubber production, and includes the following steps:

[0050] S1. The adhesive solution from the polymerization section is heated to near saturation in the adhesive solution preheater E01 under pressure, and then enters the top of the stripping tower C01. The circulating solvent and the replenishing solvent are heated and vaporized in the solvent vaporizer E02 and then enter the bottom of the stripping tower C01. In the stripping tower C01, the rising solvent vapor phase comes into countercurrent contact with the falling adhesive solution, vaporizing the light monomers in the adhesive solution. The vapor phase containing solvent and light monomers is collected from the top of the stripping tower C01 and sent to the first cooler E03. The adhesive solution with the light monomers removed is collected from the bottom of the tower and sent to the downstream process.

[0051] S2. First, in cooler E03, some solvent monomers are condensed by circulating water. The condensed liquid phase is sent to the top of monomer recovery tower CO2. The uncondensed gas phase mixes with the gas phase at the top of monomer recovery tower CO2 and then enters the second cooler E04 for cooling with chilled water. Some solvents are condensed. The cooled material enters separator V01 for gas-liquid separation. The separated gas phase is light monomers, which are sent to the polymerization section as raw materials. The liquid phase is solvent containing a small amount of monomers, which is pressurized by reflux pump P02 and then sent to monomer recovery tower CO2.

[0052] S3. In the monomer recovery tower C02, the rising gas phase is provided through the reboiler E05 of the recovery tower. The solvent and monomer are separated by distillation. The monomer gas phase at the top of the tower is sent to the second cooler E04. The liquid phase collected from the bottom of the tower is the solvent. After being pressurized by the solvent circulation pump P01, it is divided into two paths. One path is sent to the top of the stripping tower C01 as washing liquid, and the other path is sent to the solvent vaporizer E02 for vaporization and recycling.

[0053] Specifically, since a small amount of solvent condenses in the stripping tower and is carried away by the degassed adhesive, a small amount of solvent is added to the solvent vaporizer. Solvent vaporization is used to degassed the adhesive in the stripping tower, eliminating the need for a reboiler. The adhesive is preheated under pressure before entering the stripping tower to increase its temperature, reducing solvent condensation and replenishment. The monomer and solvent mixture undergoes two stages of cooling and partial condensation; the liquid phase is separated from the solvent in the monomer recovery tower. The solvent in the bottom of the monomer recovery tower is recycled, requiring only a small amount of solvent replenishment.

Claims

1. A system for degassing latex in rubber production, characterized in that, It includes a stripping tower (C01), a unit recovery tower (C02), a separator (V01), a first cooler (E03), and a second cooler (E04); The top side of the stripping tower (CO1) is connected to the adhesive collection mechanism from the polymerization section via an adhesive pipe, and the bottom side of the stripping tower (CO1) is connected to the replenishing solvent mechanism and the circulating solvent mechanism via a solvent pipe. The top and bottom of the stripping tower (CO1) are respectively provided with an air outlet and a liquid outlet. The outlet of the stripping tower (C01) is connected to the inlet of the first cooler (E03) via a pipe. The condensate outlet of the first cooler (E03) is connected to one side of the top of the unit recovery tower (C02). The top and bottom of the unit recovery tower (C02) are respectively provided with an outlet and a liquid outlet. The outlet of the unit recovery tower (CO2) is connected to a solvent circulation pump (PO1) via a second circulation pipe. The outlet of the solvent circulation pump (PO1) is divided into two paths: one path is connected to the top side wall of the stripping tower (CO1) via a pipe, and the other path is connected to the solvent pipeline via a pipe. The outlet of the single recovery tower (CO2) and the uncondensed outlet of the first cooler (E03) are both connected to the inlet of the second cooler (E04), and the outlet of the second cooler (E04) is connected to the side wall of the separation tank (V01). An adhesive preheater (E01) is installed on the adhesive pipeline. A solvent vaporizer (E02) is installed on the solvent pipeline, and another outlet of the solvent circulation pump (P01) is connected to the solvent vaporizer (E02) through a pipeline.

2. The system for degassing rubber solution in rubber production according to claim 1, characterized in that, The separation tank (V01) is provided with an air outlet and a liquid outlet at its top and bottom, respectively. The air outlet of the separation tank (V01) is connected to the polymerization section through a pipeline, and the liquid outlet of the separation tank (V01) is connected to the monomer recovery tower (CO2) through a first circulation pipeline.

3. A system for degassing latex in rubber production according to claim 2, characterized in that, A reflux pump (P02) is installed on the first circulation pipeline.

4. A system for degassing latex in rubber production according to claim 2, characterized in that, The bottom of the unit recovery tower (CO2) is equipped with a recovery tower reboiler.

5. A system for degassing latex in rubber production according to claim 2, characterized in that, A booster is provided at the outlet of the solvent circulation pump (P01).

6. A method for degassing latex in rubber production, characterized in that, A system for degassing latex in rubber production according to any one of claims 2 to 5 includes the following steps: S1. The adhesive solution from the polymerization section is heated to saturation in the adhesive solution preheater (E01) under pressure, and then enters the top of the stripping tower (C01); the circulating solvent and the replenishing solvent are heated and vaporized in the solvent vaporizer (E02) and then enter the bottom of the stripping tower (C01); in the stripping tower (C01), the rising solvent vapor phase comes into countercurrent contact with the falling adhesive solution, vaporizing the light monomers in the adhesive solution, and the vapor phase containing solvent and light monomers is collected from the top of the stripping tower (C01) and sent to the first cooler (E03); the adhesive solution with the light monomers removed is collected from the bottom of the tower and sent to the downstream process; S2. In the first cooler (E03), some solvent monomers are condensed by circulating water. The condensed liquid phase is sent to the top of the monomer recovery tower (CO2). The uncondensed gas phase is mixed with the gas phase at the top of the monomer recovery tower (CO2) and then enters the second cooler (E04) for cooling with chilled water. Some solvents are condensed. The cooled material enters the separator (V01) for gas-liquid separation. The separated gas phase is light monomers, which are sent to the polymerization section as raw materials. The liquid phase is solvent containing a small amount of monomers, which is pressurized by the reflux pump (P02) and then sent to the monomer recovery tower (CO2). S3. In the monomer recovery tower (C02), the rising gas phase is provided by the reboiler of the recovery tower. The solvent and monomer are separated by distillation. The monomer gas phase at the top of the tower is sent to the second cooler (E04). The liquid phase collected from the bottom of the tower is the solvent. After being pressurized by the solvent circulation pump (P01), it is divided into two paths. One path is sent to the top of the stripping tower (C01) as washing liquid, and the other path is sent to the solvent vaporizer (E02) for vaporization and recycling.

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