CN113185382A - Phenolate decomposing tower - Google Patents

Phenolate decomposing tower Download PDF

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Publication number
CN113185382A
CN113185382A CN202110527391.2A CN202110527391A CN113185382A CN 113185382 A CN113185382 A CN 113185382A CN 202110527391 A CN202110527391 A CN 202110527391A CN 113185382 A CN113185382 A CN 113185382A
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CN
China
Prior art keywords
decomposition
section
liquid
phenolate
inlet
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CN202110527391.2A
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Chinese (zh)
Inventor
杨雪松
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Priority to CN202110527391.2A priority Critical patent/CN113185382A/en
Publication of CN113185382A publication Critical patent/CN113185382A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/01—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis
    • C07C37/055—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis the substituted group being bound to oxygen, e.g. ether group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D7/00—Carbonates of sodium, potassium or alkali metals in general
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/005—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by obtaining phenols from products, waste products or side-products of processes, not directed to the production of phenols, by conversion or working-up
    • C07C37/007—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by obtaining phenols from products, waste products or side-products of processes, not directed to the production of phenols, by conversion or working-up from the tar industry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/80—Organic bases or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention relates to the technical field of decomposition of tar distillation sodium phenolate, in particular to a phenolate decomposition tower. The decomposing tower body is divided into three sections, the top is a tail gas washing section, the middle is a No. 1 decomposing section, and the bottom is a No. 2 decomposing section; the tail gas washing section is sequentially provided with a tail gas outlet, a raw material pure sodium phenolate inlet, a liquid distributor I, a packing layer I, a tail gas inlet and a pure sodium phenolate outlet from top to bottom; the No. 1 decomposition section is sequentially provided with a No. 1 decomposition section tail gas outlet, a pure sodium phenolate inlet, a liquid distributor II, a packing layer II, a flue gas inlet I and a No. 1 decomposition liquid outlet from top to bottom; the No. 2 decomposition section is sequentially provided with a No. 2 decomposition section tail gas outlet, a No. 1 decomposition liquid inlet, a liquid distributor III, a packing layer III, a flue gas inlet II and a No. 2 decomposition liquid outlet from top to bottom; the liquid outlet is connected with the liquid inlet through a pipeline, and the liquid flows under the action of gravity. One decomposition tower is adopted to complete the cleaning of the tail gas and the primary decomposition of the sodium phenolate, and the decomposition rate of the primary decomposed phenol is improved.

Description

Phenolate decomposing tower
Technical Field
The invention relates to the technical field of decomposition of tar distillation sodium phenolate, in particular to a phenolate decomposition tower.
Background
The coal tar contains various organic matters, wherein phenols account for 1-2% and are relatively expensive components, phenol sodium salts are obtained by fraction washing mainly in a three-mixed fraction (phenol oil, naphthalene oil and wash oil) obtained after distillation of the coal tar, namely after the three-mixed fraction is mixed with a 12% NaOH solution, phenols in the mixed fraction react with alkali to generate water-soluble phenol sodium salts, the water-soluble phenol sodium salts can be obtained by standing and oil-water separation of the phenol sodium salts and the dephenolized mixed fraction, and crude phenol is obtained by phenolate decomposition, namely acidolysis.
The decomposition of phenolate is generally carried out by the sulfuric acid method and the carbon dioxide decomposition method, and only the carbon dioxide decomposition method will be discussed here.
The carbon dioxide decomposition method is to adopt flue gas or blast furnace gas, utilize the carbon dioxide component contained in the flue gas, decompose sodium phenolate, namely sodium phenolate and carbon dioxide react in aqueous solution, produce crude phenol and sodium carbonate, when the carbon dioxide is excessive, the reaction produces the baking soda, if there is baking soda in the baking soda solution, it is complete to show that decomposes.
The carbon dioxide decomposition process comprises five towers, namely a tail gas washing tower, a 1# decomposition tower, a 2# decomposition tower, a crude phenol acidification tower and a sodium carbonate treatment tower, and commonly undertakes the carbon dioxide decomposition task, the equipment integration level is poor, the arrangement is dispersed, a plurality of liquid delivery pumps are needed to connect the whole process, the 1# decomposition tower and the 2# decomposition tower adopt carbon dioxide gas parallel flow contact for bubbling mass transfer, chemical reaction occurs, the decomposition rate is not easy to reach more than 99%, and sometimes sulfuric acid decomposition is needed to be used as a security protection.
CN112521253A discloses a 'system and a process for decomposing sodium phenolate by carbon dioxide', which saves a large amount of running cost, reduces the occupied area and improves the decomposition rate and the intrinsic safety of the phenolate in the whole process. However, the carbon dioxide gas is still adopted in the decomposition tower for concurrent flow contact to carry out bubbling mass transfer and generate chemical reaction, and the method belongs to a practical but lowest gas-liquid mass transfer efficiency and has the need of improvement and improvement.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a phenolate decomposition tower, which adopts one decomposition tower to complete the cleaning of tail gas and the primary decomposition of sodium phenolate and improve the decomposition rate of primary decomposed phenol.
In order to achieve the purpose, the invention adopts the following technical scheme:
a phenate decomposition tower is characterized in that a tower body of the decomposition tower is divided into three sections, wherein the top of the decomposition tower is a tail gas washing section, the middle of the decomposition tower is a No. 1 decomposition section, and the bottom of the decomposition tower is a No. 2 decomposition section; the tail gas washing section is sequentially provided with a tail gas outlet, a raw material pure sodium phenolate inlet, a liquid distributor I, a packing layer I, a tail gas inlet and a pure sodium phenolate outlet from top to bottom; the No. 1 decomposition section is sequentially provided with a No. 1 decomposition section tail gas outlet, a pure sodium phenolate inlet, a liquid distributor II, a packing layer II, a flue gas inlet I and a No. 1 decomposition liquid outlet from top to bottom; the No. 2 decomposition section is sequentially provided with a No. 2 decomposition section tail gas outlet, a No. 1 decomposition liquid inlet, a liquid distributor III, a packing layer III, a flue gas inlet II and a No. 2 decomposition liquid outlet from top to bottom; the liquid outlet is connected with the liquid inlet through a pipeline, and the liquid flows under the action of gravity.
The decomposition tower comprises a tower body and a skirt, wherein the tower body is fixedly connected to the top of the skirt.
The skirt is provided with a skirt inspection hole; the height of the skirt base meets the requirement of the liquid level difference that the decomposition liquid is sent to the primary decomposition separation tank from the No. 2 decomposition liquid outlet.
The decomposing tower body is divided into an upper section, a middle section and a lower section through partition plates, and the upper section, the middle section and the lower section are respectively a tail gas washing section, a No. 1 decomposing section and a No. 2 decomposing section.
And the tail gas washing section, the No. 1 decomposition section and the No. 2 decomposition section are respectively provided with a manhole, a hand hole and an instrument pressure interface.
The raw material net sodium phenolate inlet is a plug-in liquid feeding pipe and has a distributed feeding function.
The net sodium phenolate inlet is a plug-in liquid feeding pipe and has a distributed feeding function.
The No. 1 decomposition liquid inlet is a plug-in liquid feeding pipe and has a distributed feeding function.
And the fillers of the first filler layer, the second filler layer and the third filler layer are all garland fillers.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts one decomposition tower to complete the cleaning of the tail gas and the one-time decomposition of the sodium phenolate, integrates a plurality of devices into a whole, has high integration level and centralized arrangement, saves a large amount of operation cost, reduces the occupied area and improves the intrinsic safety of the whole process.
The one-time decomposition of the sodium phenolate is changed from the original bubbling mass transfer reaction into the countercurrent contact mass transfer reaction in the packing layer, so that the decomposition rate of the one-time decomposition of the phenol is improved, and the sodium phenolate is not required to be decomposed by sulfuric acid for protection.
Drawings
FIG. 1 is a schematic diagram of the present invention.
In the figure: 1-a tower body; 2-skirt bases; 3, a manhole I; 4, a manhole II; 5-manhole three; 6-manhole four; 7-manhole five; 8-manhole six; 9-skirt inspection holes; 10-hand hole one; 11-hand hole two; 12-hand hole three; 13-hand hole four; 14, hand hole five; 15-hand hole six; 16-raw material sodium phenolate inlet; 17-net sodium phenolate outlet; 18-neat sodium phenolate inlet; 19-1# decomposition liquid outlet; 20-1# decomposition liquid inlet; a 21-2# decomposition liquid outlet; a tail gas outlet of the 22-1# decomposition section; a 23-2# decomposition section tail gas outlet; 24-tail gas inlet one; 25-tail gas inlet II; 26-a tail gas outlet; 27-flue gas inlet one; 28-flue gas inlet II 29-instrument pressure interface I; 30-instrument pressure interface two; 31-instrument pressure interface three; 32-liquid distributor one; 33-liquid distributor two; 34-liquid distributor III; 35-a first filler layer; 36-a second filler layer; 37-filler layer three; 38-partition plate one; 39-partition board two.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in figure 1, the phenolate decomposition tower comprises a tower body 1 and a skirt 2, wherein the tower body 1 is fixedly connected to the top of the skirt 2.
The tower body 1 is divided into an upper section, a middle section and a lower section through a first partition plate 38 and a second partition plate 39, the top is a tail gas washing section, the middle is a 1# decomposition section, and the bottom is a 2# decomposition section.
The tail gas washing section is sequentially provided with a tail gas outlet 26, a manhole I3, a raw material purified sodium phenolate inlet 16, a liquid distributor I32, a hand hole I10, a packing layer I35, a hand hole II 11, (a tail gas inlet I24 and a tail gas inlet II 25), an instrument pressure interface I29 and a purified sodium phenolate outlet 17 from top to bottom.
The No. 1 decomposition section is sequentially provided with a No. 1 decomposition section tail gas outlet 22, a manhole three 5, a purified sodium phenolate inlet 18, a liquid distributor two 33, a hand hole three 12, a packing layer two 36, a hand hole four 13, a flue gas inlet one 27, a manhole four 6, an instrument pressure interface two 30 and a No. 1 decomposition liquid outlet 19 from top to bottom.
The No. 2 decomposition section is sequentially provided with a No. 2 decomposition section tail gas outlet 23, a manhole five 7, a No. 1 decomposition liquid inlet 20, a liquid distributor three 34, a hand hole five 14, a packing layer three 37, a hand hole six 15, a flue gas inlet two 28, a manhole six 8, an instrument pressure interface three 31 and a No. 2 decomposition liquid outlet 21 from top to bottom.
The raw material net sodium phenolate inlet 16 is a plug-in liquid feed pipe, and has a distributed feeding function. The net sodium phenolate inlet 18 is a plug-in liquid feed tube with a distributed feeding function. The No. 1 decomposition liquid inlet 20 is a plug-in liquid feeding pipe and has a distributed feeding function. The fillers of the first filler layer 35, the second filler layer 36 and the third filler layer 37 are all garland fillers.
The pure sodium phenolate outlet 17 is connected with the pure sodium phenolate inlet 18 through a pipeline, the No. 1 decomposition liquid outlet 19 is connected with the No. 1 decomposition liquid inlet 20 through a pipeline, the liquid outlet and the liquid inlet are connected through a pipeline, and the liquid flows under the action of gravity.
The skirt 2 is provided with a skirt inspection hole 9, and the height of the skirt 2 meets the requirement of the liquid level difference that the decomposition liquid is sent to the primary decomposition separation tank from the No. 2 decomposition liquid outlet 21.
The process principle and the working process of the invention specifically comprise the following steps:
1. the carbon dioxide-containing flue gas sent from the outside of the device is boosted by a flue gas fan and then sent to a first flue gas inlet 27 at the middle section and a second flue gas inlet 28 at the lower section of the decomposition tower for decomposing sodium phenolate in the liquid phase.
2. The external clean sodium phenolate is pumped into an upper section raw material clean sodium phenolate inlet 16 of the decomposition tower by a pump, tail gas introduced from the bottom is sprayed and washed from the top by a liquid distributor 32, the tail gas comes from a middle section 1# decomposition section tail gas outlet 22 and a lower section 2# decomposition section tail gas outlet 23, the tail gas is sent into a tail gas inlet I24 by a crude phenol acidification tower and is subjected to phenolate decomposition by a tail gas inlet II 25 by a sodium carbonate treatment tower, the tail gas is in countercurrent contact with the tail gas at a packing layer I35, residual alkali in the clean sodium phenolate in the washing process is utilized to neutralize a small amount of phenol carried out in the tail gas during phenolate decomposition of the flue gas, the tail gas is subjected to dephenolate washing, phenolate decomposition reaction is also carried out, and then the clean sodium phenolate is discharged from a clean sodium phenolate outlet 17 and is automatically fed into a clean sodium phenolate inlet 18 in the middle section of the decomposition tower by a process pipeline by utilizing the self gravity.
3. The clean sodium phenolate flowing in from the clean sodium phenolate inlet 18 is sprayed from the top through the second liquid distributor 33, and is in countercurrent contact with carbon dioxide gas entering from the bottom in the second packing layer 36 for mass transfer to generate chemical reaction to generate phenolic substances and sodium carbonate, and the reaction product flows out from the No. 1 decomposition liquid outlet 19 and is automatically fed into the No. 1 decomposition liquid inlet 20 at the lower section through a process pipeline by utilizing the self gravity.
4. The No. 1 decomposition liquid flowing in from the No. 1 decomposition liquid inlet 20 is sprayed from the top through the liquid distributor III 34, and is in countercurrent contact with carbon dioxide gas entering from the bottom in the packing layer III 37 for mass transfer to generate chemical reaction to generate phenolic substances and sodium carbonate, reaction products are discharged from the No. 2 decomposition liquid outlet 21, and then are automatically fed into a primary decomposition separation tank through a process pipeline by utilizing the self gravity, and the process is called primary decomposition.
The invention adopts one decomposition tower to complete the cleaning of the tail gas and the one-time decomposition of the sodium phenolate, integrates a plurality of devices into a whole, has high integration level and centralized arrangement, saves a large amount of operation cost, reduces the occupied area and improves the intrinsic safety of the whole process. The one-time decomposition of the sodium phenolate is changed from the original bubbling mass transfer reaction into the countercurrent contact mass transfer reaction in the packing layer, so that the decomposition rate of the one-time decomposition of the phenol is improved, and the sodium phenolate is not required to be decomposed by sulfuric acid for protection.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (9)

1. A phenolate decomposition column characterized in that: the decomposing tower body is divided into three sections, the top is a tail gas washing section, the middle is a No. 1 decomposing section, and the bottom is a No. 2 decomposing section; the tail gas washing section is sequentially provided with a tail gas outlet, a raw material pure sodium phenolate inlet, a liquid distributor I, a packing layer I, a tail gas inlet and a pure sodium phenolate outlet from top to bottom; the No. 1 decomposition section is sequentially provided with a No. 1 decomposition section tail gas outlet, a pure sodium phenolate inlet, a liquid distributor II, a packing layer II, a flue gas inlet I and a No. 1 decomposition liquid outlet from top to bottom; the No. 2 decomposition section is sequentially provided with a No. 2 decomposition section tail gas outlet, a No. 1 decomposition liquid inlet, a liquid distributor III, a packing layer III, a flue gas inlet II and a No. 2 decomposition liquid outlet from top to bottom; the liquid outlet is connected with the liquid inlet through a pipeline, and the liquid flows under the action of gravity.
2. A phenolate decomposition column according to claim 1, wherein: the decomposition tower comprises a tower body and a skirt, wherein the tower body is fixedly connected to the top of the skirt.
3. A phenolate decomposition tower according to claim 2, wherein: the skirt is provided with a skirt inspection hole; the height of the skirt base meets the requirement of the liquid level difference that the decomposition liquid is sent to the primary decomposition separation tank from the No. 2 decomposition liquid outlet.
4. A phenolate decomposition column according to claim 1, wherein: the decomposing tower body is divided into an upper section, a middle section and a lower section through partition plates, and the upper section, the middle section and the lower section are respectively a tail gas washing section, a No. 1 decomposing section and a No. 2 decomposing section.
5. A phenolate decomposition column according to claim 1, wherein: and the tail gas washing section, the No. 1 decomposition section and the No. 2 decomposition section are respectively provided with a manhole, a hand hole and an instrument pressure interface.
6. A phenolate decomposition column according to claim 1, wherein: the raw material net sodium phenolate inlet is a plug-in liquid feeding pipe and has a distributed feeding function.
7. A phenolate decomposition column according to claim 1, wherein: the net sodium phenolate inlet is a plug-in liquid feeding pipe and has a distributed feeding function.
8. A phenolate decomposition column according to claim 1, wherein: the No. 1 decomposition liquid inlet is a plug-in liquid feeding pipe and has a distributed feeding function.
9. A phenolate decomposition column according to claim 1, wherein: and the fillers of the first filler layer, the second filler layer and the third filler layer are all garland fillers.
CN202110527391.2A 2021-05-14 2021-05-14 Phenolate decomposing tower Pending CN113185382A (en)

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CN202110527391.2A CN113185382A (en) 2021-05-14 2021-05-14 Phenolate decomposing tower

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CN202110527391.2A CN113185382A (en) 2021-05-14 2021-05-14 Phenolate decomposing tower

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112521253A (en) * 2020-12-18 2021-03-19 中冶焦耐(大连)工程技术有限公司 Carbon dioxide decomposition system and process for sodium phenolate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112521253A (en) * 2020-12-18 2021-03-19 中冶焦耐(大连)工程技术有限公司 Carbon dioxide decomposition system and process for sodium phenolate

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