CN116675591A - Method and system for decoloring and refining crude styrene - Google Patents
Method and system for decoloring and refining crude styrene Download PDFInfo
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- CN116675591A CN116675591A CN202210164201.XA CN202210164201A CN116675591A CN 116675591 A CN116675591 A CN 116675591A CN 202210164201 A CN202210164201 A CN 202210164201A CN 116675591 A CN116675591 A CN 116675591A
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- styrene
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- decolorizing
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- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 title claims abstract description 318
- 238000007670 refining Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 135
- 238000011084 recovery Methods 0.000 claims abstract description 54
- 230000008929 regeneration Effects 0.000 claims abstract description 41
- 238000011069 regeneration method Methods 0.000 claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 238000004042 decolorization Methods 0.000 claims description 31
- 239000003712 decolorant Substances 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 14
- 239000002699 waste material Substances 0.000 claims description 13
- 238000000746 purification Methods 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical group O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims description 9
- 230000001172 regenerating effect Effects 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 22
- 239000002351 wastewater Substances 0.000 abstract description 15
- 239000000126 substance Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003513 alkali Substances 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 238000010936 aqueous wash Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- CLBRCZAHAHECKY-UHFFFAOYSA-N [Co].[Pt] Chemical compound [Co].[Pt] CLBRCZAHAHECKY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000895 extractive distillation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/148—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound
- C07C7/17—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound with acids or sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to the field of chemical industry and discloses a method and a system for decoloring and refining crude styrene. The system comprises a decoloring reaction unit, a decoloring agent regeneration unit, a decoloring agent recovery unit and a styrene refining unit; the decoloring reaction unit comprises a decoloring mixer and a decoloring reaction tank; the decolorizing agent regeneration unit comprises a decolorizing agent regeneration tower and optionally a light component removal tower; the decoloring agent recovery unit comprises a decoloring agent recovery tower; the styrene refining unit comprises a styrene refining tower; the method and the system can thoroughly cancel the alkaline washing and water washing process of the prior crude styrene decoloring process, realize the regeneration of the decoloring agent and the recovery of styrene, finally realize the zero discharge of decoloring wastewater and improve the recovery rate of styrene products.
Description
Technical Field
The invention belongs to the field of chemical industry, and particularly relates to a method and a system for decoloring and refining crude styrene.
Background
In the existing crude styrene decoloring device, a nitric acid decoloring device is adopted, and acid washing, alkali washing and water washing processes are adopted, so that salt-containing wastewater generated in the process is difficult to treat, and great trouble is brought to the operation of the device.
US3763015 provides a process for separating styrene from pyrolysis gasoline. In this process, pyrolysis gasoline is first distilled to recover a fraction having a boiling point between 120 ℃ and 160 ℃. The fraction is then subjected to extractive distillation with an organic polar solvent containing a nitrite polymerization inhibitor which solubilizes styrene. The solvent is removed and the styrene-containing fraction is then treated with nitric acid and then washed with water or alkali. The resulting product is fractionated to recover substantially colorless high purity styrene.
From the above prior art, it can be seen that in the existing crude styrene decolorization refining method, a large amount of wastewater containing nitrate is generated by performing the decolorization process of acid washing, alkali washing and water washing on the crude styrene, so that a new crude styrene decolorization refining method and system are needed to thoroughly solve the problem of treatment of the wastewater containing nitrate and realize zero discharge of the decolorized wastewater.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a method and a system for decoloring and refining crude styrene. The method and the system can thoroughly cancel the alkaline washing and water washing process of the prior crude styrene decoloring process, realize the regeneration of the decoloring agent and the recovery of styrene, finally realize the zero discharge of decoloring wastewater and improve the recovery rate of styrene products.
In order to achieve the above object, an aspect of the present invention provides a crude styrene decolorization and purification system comprising a decolorization reaction unit, a decolorizer regeneration unit, a decolorizer recovery unit, and a styrene purification unit;
the decoloring reaction unit comprises a decoloring mixer and a decoloring reaction tank;
the decolorizing agent regeneration unit comprises a decolorizing agent regeneration tower and optionally a light component removal tower;
the decolorizing agent recovery unit comprises a decolorizing agent recovery tower;
the styrene refining unit comprises a styrene refining tower;
the decoloring mixer, the decoloring reaction tank, the decoloring agent recovery tower and the styrene refining tower are sequentially communicated;
the decolorizing reaction tank is provided with a waste decolorizing agent outlet which is communicated with the inlet of the decolorizing agent regeneration tower; optionally, the waste decolorizing agent outlet is in sequential communication with the light ends removal column and the decolorizing agent regeneration column as shown in fig. 2;
the decolorizing agent regeneration tower is provided with a first tower top aqueous styrene outlet and a regenerated decolorizing agent outlet, the styrene refining tower is provided with an aqueous styrene inlet, the first tower top aqueous styrene outlet is communicated with the aqueous styrene inlet, the decolorizing mixer is provided with a regenerated decolorizing agent inlet, and the regenerated decolorizing agent inlet is communicated with the regenerated decolorizing agent outlet; optionally, as shown in fig. 2, the light component removal column is provided with a second overhead aqueous styrene outlet and a light component removal decolorizing agent outlet, the second overhead aqueous styrene outlet is also communicated with the aqueous styrene inlet through a second overhead aqueous styrene line, and the light component removal decolorizing agent outlet is communicated with the inlet of the decolorizing agent regeneration column through a light component removal decolorizing agent line;
the decolorizing agent recovery tower is provided with a recovery decolorizing agent outlet, the decolorizing reaction tank is provided with a recovery decolorizing agent inlet, and the recovery decolorizing agent outlet is communicated with the recovery decolorizing agent inlet.
According to the invention, preferably, the decolorization mixer is further provided with a crude styrene inlet and a fresh decolorizer inlet.
According to the present invention, preferably, the styrene refining column is further provided with a styrene product outlet.
According to the invention, preferably, the decolorization mixer is a static mixer or a stirrer.
According to the present invention, it is preferable that the theoretical plate number of the decolorizing agent regenerating column is 3 to 20.
According to the present invention, it is preferable that the theoretical plate number of the light ends column is 2 to 10.
According to the present invention, preferably, the theoretical plate number of the decolorizing agent recovery column is 5 to 20.
According to the present invention, the theoretical plate number of the styrene-refining column is preferably 10 to 40.
The invention also provides a method for decoloring and refining crude styrene, which utilizes the system for decoloring and refining crude styrene, and comprises the following steps:
s1: sequentially treating crude styrene and fresh decolorizing agent by a decolorizing reaction unit, a decolorizing agent recovery unit and a styrene refining unit to obtain a styrene product; and returning the recovered decolorizing agent recovered by the decolorizing agent recovery unit to the decolorizing reaction tank;
s2: and (3) carrying out decolorant regeneration treatment on the waste decolorant discharged from the decolorant reaction tank in the decolorant regeneration unit to obtain aqueous styrene and regenerated decolorant, sending the aqueous styrene into the styrene refining unit for treatment, and sending the regenerated decolorant back to the decolorant mixer.
According to the present invention, preferably, the crude styrene is from a styrene extraction unit of a styrene extraction device.
According to the invention, preferably, the fresh decolorizing agent is 60 to 80% by weight of nitric acid.
According to the invention, preferably, the regenerated decolorizer is 60 to 80% by weight of nitric acid.
According to the present invention, preferably, when the decolorizing agent regeneration unit includes only the decolorizing agent regeneration tower, the tower top pressure of the decolorizing agent regeneration tower is 5 to 60kPaA, and the mass reflux ratio is 0.1 to 5.
According to the present invention, preferably, when the decolorizing agent regeneration unit includes a light component removal column and a decolorizing agent regeneration column, the top pressure of the light component removal column is 5 to 60kPaA, the mass reflux ratio is 0.1 to 5, and the top pressure of the decolorizing agent regeneration column is 50 to 120kPaA, the mass reflux ratio is 0.1 to 5.
According to the present invention, preferably, the pressure at the top of the decolorizing agent recovery column is 5 to 60kPaA and the mass reflux ratio is 0.5 to 5.
According to the present invention, preferably, the top pressure of the styrene refining column is 5 to 15kPaA, and the mass reflux ratio is 1 to 3.
According to the present invention, preferably, the decoloring mixer of the decoloring reaction unit is a stirrer, and the stirring speed of the stirrer is 1000 to 10000r/min.
The technical scheme of the invention has the following beneficial effects:
the method and the system can thoroughly cancel the alkaline washing and water washing process of the prior crude styrene decoloring process, realize the regeneration of the decoloring agent and the recovery of styrene, finally realize the zero discharge of decoloring wastewater and improve the recovery rate of styrene products.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic diagram of a crude styrene decolorizing and refining system provided in example 1 of the present invention.
Fig. 2 shows a schematic diagram of a crude styrene decolorization refining system provided by the invention.
Fig. 3 shows a schematic diagram of a crude styrene decolorizing and refining system provided in comparative example 1 of the present invention.
The reference numerals are explained as follows:
1-a decoloring mixer; 2-decolorizing reaction tank; 3-a decoloring agent regeneration tower; 4-a decoloring agent recovery tower; a 5-styrene refining column; a 6-crude styrene inlet; 7-fresh decolorizing agent inlet; 8-a spent decolorizing agent line; 9-regenerating the decolorizer line; 10-a first overhead aqueous styrene line; 11-a decolorizing agent-containing styrene line; 12-recovering the decolorizing agent line; 13-decolorizing a styrene line; a 14-styrene product outlet;
15-an alkaline washing unit; a 16-water washing unit; 17-spent lye line; 18-fresh lye feed line; 19-alkaline washing a styrene pipeline; 20-a fresh water wash water feed line; 21-washing a waste water pipeline; 22-washing a styrene pipeline;
23-a light component removing tower; 24-a light-weight decolourizer line; 25-a second overhead aqueous styrene line.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
The present embodiment provides a crude styrene decolorization and purification system, as shown in FIG. 1, comprising a decolorization reaction unit, a decolorizer regeneration unit, a decolorizer recovery unit, and a styrene purification unit;
the decoloring reaction unit comprises a decoloring mixer 1 and a decoloring reaction tank 2 which are connected in sequence;
the decoloring agent regeneration unit comprises a decoloring agent regeneration tower 3;
the decoloring agent recovery unit comprises a decoloring agent recovery tower 4;
the styrene refining unit comprises a styrene refining tower 5;
the decoloring mixer 1 is also provided with a crude styrene inlet 6 and a fresh decoloring agent inlet 7; the decoloring mixer 1 is a static mixer;
the decoloring reaction tank 2 is communicated with the decoloring agent recovery tower 4 through a decoloring agent-containing styrene pipeline 11;
the decolorizing agent recovery tower 4 is communicated with the styrene refining tower 5 through a decolorizing styrene pipeline 13; the styrene refining column is also provided with a styrene product outlet 14.
The decolorizing reaction tank 2 is provided with a waste decolorizing agent outlet which is communicated with the inlet of the decolorizing agent regeneration tower 3 through a waste decolorizing agent pipeline 8;
the decolorizing agent regeneration tower 3 is provided with a first tower top aqueous styrene outlet and a regenerated decolorizing agent outlet, the styrene refining tower 5 is provided with an aqueous styrene inlet, the first tower top aqueous styrene outlet is communicated with the aqueous styrene inlet through a first tower top aqueous styrene pipeline 10, the decolorizing mixer 1 is provided with a regenerated decolorizing agent inlet, and the regenerated decolorizing agent inlet is communicated with the regenerated decolorizing agent outlet through a regenerated decolorizing agent pipeline 9;
the decolorizing agent recovery tower 4 is provided with a recovery decolorizing agent outlet, the decolorizing reaction tank 2 is provided with a recovery decolorizing agent inlet, and the recovery decolorizing agent outlet is communicated with the recovery decolorizing agent inlet through a recovery decolorizing agent pipeline 12.
The theoretical plate number of the decoloring agent regeneration tower 3 is 15;
the theoretical plate number of the decoloring agent recovery tower 4 is 15;
the theoretical plate number of the styrene-refining column 5 was 30.
Example 2
This example provides a method for decolorizing and refining crude styrene, which uses the system for decolorizing and refining crude styrene described in example 1, comprising the following steps:
s1: treating crude styrene (styrene extraction unit from a styrene extraction device) and fresh decolorizing agent (70%wt of nitric acid) sequentially by a decolorizing mixer 1, a decolorizing reaction tank 2, a decolorizing agent recovery tower 4 and a styrene refining tower 5 to obtain a styrene product; and returning the recovered decolorizing agent recovered by the decolorizing agent recovery tower 4 to the decolorizing reaction tank 2;
s2: the waste decolorizing agent discharged from the decolorizing reaction tank 2 is subjected to decolorizing agent regeneration treatment in the decolorizing agent regeneration tower 3 to obtain aqueous styrene and regenerated decolorizing agent (66% wt nitric acid), the aqueous styrene is sent to the styrene refining tower 5 for treatment, and the regenerated decolorizing agent is sent back to the decolorizing mixer 1.
The tower top pressure of the decoloring agent regeneration tower 3 is 5kPaA, and the mass reflux ratio is 2;
the tower top pressure of the decoloring agent recovery tower 4 is 5kPaA, and the mass reflux ratio is 2;
the top pressure of the styrene refining tower 5 is 10kPaA, and the mass reflux ratio is 2.
Comparative example 1
This comparative example provides a crude styrene decolorization and purification system comprising a decolorization mixer 1, a decolorization reaction tank 2, an alkaline washing unit 15, a water washing unit 16, and a styrene purification column 5, as shown in FIG. 3;
the decoloring mixer 1, the decoloring reaction tank 2, a decoloring agent-containing styrene pipeline 11, an alkaline washing unit 15, an alkaline washing styrene pipeline 19, a water washing unit 16, a water washing styrene pipeline 22 and a styrene refining tower 5 are sequentially communicated;
the decoloring mixer 1 is also provided with a crude styrene inlet 6 and a fresh decoloring agent inlet 7; the decoloring mixer 1 is a static mixer;
the decolorizing agent reaction tank 2 is provided with a waste decolorizing agent pipeline 8;
the alkaline washing unit 15 is provided with a fresh lye feed line 18 and a spent lye line 17;
the water wash unit 16 is provided with a fresh water wash water feed line 20 and a water wash waste line 21;
the styrene refining column 5 is provided with a styrene product outlet 14.
The theoretical plate number of the styrene refining tower is 30.
The method for decolorizing and refining crude styrene (styrene extraction unit from styrene extraction device) by using the system described in this comparative example comprises:
adding fresh lye to the alkaline wash unit 15 via fresh lye feed line 18 and adding aqueous wash water to the aqueous wash unit 16 via fresh aqueous wash water feed line 20; sequentially passing crude styrene (styrene extraction unit from styrene extraction device) and fresh decolorizing agent (70%wt nitric acid) through decolorizing mixer 1, decolorizing reaction tank 2, alkaline washing unit 15 and water washing unit 16 to obtain washed styrene, waste decolorizing agent, alkaline washing wastewater and water washing wastewater;
the washed styrene is discharged from the styrene product outlet 14 through the styrene refining column 5;
the spent decolorizing agent exits the system from the spent decolorizing agent line 8;
the alkaline washing wastewater is discharged from the system through the waste alkali liquid pipeline 17;
the wash waste water exits the system from the wash waste water line 21.
The fresh lye used in the alkaline washing unit 15 is 20% wt sodium hydroxide;
the fresh water used in the water washing unit 16 is desalinated water.
The top pressure of the styrene refining tower 5 is 10kPaA, and the mass reflux ratio is 2.
Test case
This test example compares the treatment results of the crude styrene decolorization refining method of example 2 and comparative example 1, as shown in table 1:
TABLE 1
| Project | Example 1 | Comparative example 1 |
| Raw styrene feed amount, kg/h | 1000 | 1000 |
| Fresh decolorizing agent feed, kg/h | 9 | 20 |
| Fresh lye feed, kg/h | 0 | 40 |
| Fresh water washing water feed, kg/h | 0 | 200 |
| Styrene recovery,% wt | 99.9 | 98.2 |
| Waste water amount, kg/h | 0 | 263 |
| Chromaticity value of styrene product (platinum cobalt colorimetric) | 7 | 8 |
As can be seen from the comparison results of Table 1, the crude styrene decolorization refining system provided by the invention can thoroughly cancel the alkaline washing and water washing process of the existing crude styrene decolorization process, can reduce the consumption of a decolorizer by 55%, realizes the regeneration of the decolorizer and the recovery of styrene, and finally realizes the zero discharge of decolorized wastewater in the crude styrene decolorization process, wherein the chromaticity of the obtained styrene product meets the requirement, and the recovery rate of the styrene product can be improved by 1.7 percent.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A crude styrene decolorization refining system is characterized by comprising a decolorization reaction unit, a decolorizer regeneration unit, a decolorizer recovery unit and a styrene refining unit;
the decoloring reaction unit comprises a decoloring mixer and a decoloring reaction tank;
the decolorizing agent regeneration unit comprises a decolorizing agent regeneration tower and optionally a light component removal tower;
the decolorizing agent recovery unit comprises a decolorizing agent recovery tower;
the styrene refining unit comprises a styrene refining tower;
the decoloring mixer, the decoloring reaction tank, the decoloring agent recovery tower and the styrene refining tower are sequentially communicated;
the decolorizing reaction tank is provided with a waste decolorizing agent outlet which is communicated with the inlet of the decolorizing agent regeneration tower; optionally, the waste decolorizing agent outlet is sequentially communicated with the light component removing tower and the decolorizing agent regenerating tower;
the decolorizing agent regeneration tower is provided with a first tower top aqueous styrene outlet and a regenerated decolorizing agent outlet, the styrene refining tower is provided with an aqueous styrene inlet, the first tower top aqueous styrene outlet is communicated with the aqueous styrene inlet, the decolorizing mixer is provided with a regenerated decolorizing agent inlet, and the regenerated decolorizing agent inlet is communicated with the regenerated decolorizing agent outlet; optionally, the light component removal tower is provided with a second tower top aqueous styrene outlet and a light component removal and decolorization agent outlet, wherein the second tower top aqueous styrene outlet is also communicated with the aqueous styrene inlet, and the light component removal and decolorization agent outlet is communicated with the inlet of the decolorization agent regeneration tower;
the decolorizing agent recovery tower is provided with a recovery decolorizing agent outlet, the decolorizing reaction tank is provided with a recovery decolorizing agent inlet, and the recovery decolorizing agent outlet is communicated with the recovery decolorizing agent inlet.
2. The crude styrene decolorization refining system according to claim 1, wherein,
the decoloring mixer is also provided with a crude styrene inlet and a fresh decoloring agent inlet;
the styrene refining tower is also provided with a styrene product outlet.
3. The crude styrene decolorization refining system according to claim 1, wherein,
the decoloring mixer is a static mixer or a stirrer;
the theoretical plate number of the decoloring agent regeneration tower is 3-20;
the theoretical plate number of the light component removal tower is 2-10;
the theoretical plate number of the decoloring agent recovery tower is 5-20;
the theoretical plate number of the styrene refining tower is 10-40.
4. A method for decolorizing and refining crude styrene, which is characterized by using the system for decolorizing and refining crude styrene according to any one of claims 1-3, and comprises the following steps:
s1: sequentially treating crude styrene and fresh decolorizing agent by a decolorizing reaction unit, a decolorizing agent recovery unit and a styrene refining unit to obtain a styrene product; and returning the recovered decolorizing agent recovered by the decolorizing agent recovery unit to the decolorizing reaction tank;
s2: and (3) carrying out decolorant regeneration treatment on the waste decolorant discharged from the decolorant reaction tank in the decolorant regeneration unit to obtain aqueous styrene and regenerated decolorant, sending the aqueous styrene into the styrene refining unit for treatment, and sending the regenerated decolorant back to the decolorant mixer.
5. The method for decolorization and purification of crude styrene according to claim 4, wherein said crude styrene is obtained from a styrene extraction unit of a styrene extraction device.
6. The method for decolorization and purification of crude styrene according to claim 4, wherein,
the fresh decoloring agent is nitric acid with the weight of 60-80%;
the regenerated decoloring agent is nitric acid with the weight of 60-80 percent.
7. The method for decolorization and purification of crude styrene according to claim 4, wherein when said decolorizing agent regenerating unit comprises only a decolorizing agent regenerating column, the pressure at the top of the decolorizing agent regenerating column is 5 to 60kPaA and the mass reflux ratio is 0.1 to 5.
8. The method for decolorizing and refining crude styrene according to claim 4, wherein, when the decolorizing agent regenerating unit comprises a light component removing tower and a decolorizing agent regenerating tower, the top pressure of the light component removing tower is 5 to 60kPaA, the mass reflux ratio is 0.1 to 5, the top pressure of the decolorizing agent regenerating tower is 50 to 120kPaA, and the mass reflux ratio is 0.1 to 5.
9. The method for decolorization and purification of crude styrene according to claim 4, wherein,
the pressure at the top of the decoloring agent recovery tower is 5-60 kPaA, and the mass reflux ratio is 0.5-5;
the top pressure of the styrene refining tower is 5-15kPaA, and the mass reflux ratio is 1-3.
10. The method for decolorization and purification of crude styrene according to claim 4, wherein the decolorization mixer of the decolorization reaction unit is a stirrer, and the stirring rate of the stirrer is 1000 to 10000r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210164201.XA CN116675591A (en) | 2022-02-22 | 2022-02-22 | Method and system for decoloring and refining crude styrene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210164201.XA CN116675591A (en) | 2022-02-22 | 2022-02-22 | Method and system for decoloring and refining crude styrene |
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|---|---|
| CN116675591A true CN116675591A (en) | 2023-09-01 |
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| CN202210164201.XA Pending CN116675591A (en) | 2022-02-22 | 2022-02-22 | Method and system for decoloring and refining crude styrene |
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| Country | Link |
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