CN101486627B - Method for extracting durene distillate from C10 heavy aromatic by continuous multistrand side line discharge fractional distillation - Google Patents
Method for extracting durene distillate from C10 heavy aromatic by continuous multistrand side line discharge fractional distillation Download PDFInfo
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- CN101486627B CN101486627B CN200810243873A CN200810243873A CN101486627B CN 101486627 B CN101486627 B CN 101486627B CN 200810243873 A CN200810243873 A CN 200810243873A CN 200810243873 A CN200810243873 A CN 200810243873A CN 101486627 B CN101486627 B CN 101486627B
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Abstract
The invention relates to a method for extracting durene fraction from C10 heavy aromatics by a continuous multistrand side-draw discharging rectification method, which comprises the steps: (1) raw material is added into the column bottom of a rectifying column; (2) the temperature at the column bottom and the column top are respectively 230 DEG C and 185 DEG C to 186 DEG C; (3) when total reflux is reached, raw material is put in from the middle of the column; a side-draw discharging port A discharges C10 light components, a side-draw discharging port B discharges durene and a side-draw discharging port C discharges naphthalene; wherein, the side-draw discharging port B discharges at the speed of 1.5ml/min and the side-draw discharging port C discharges at the speed of 0.4ml/min; and (4) after single distillation treatment, the mass content of durene at the side-draw discharging port B reaches more than 14 percent and the yield is more than 88 percent; meanwhile, the side-draw discharging port A, the side-draw discharging port C and a side-draw discharging port D respectively obtain C10 light components, naphthalene enrichment culture and methylnaphthalene enrichment culture. The method has short reaction cycle, simple operation, low energy consumption and relatively high yield. The content of durene in the durene enrichment culture can increase by 14 percent.
Description
Technical field
The present invention relates to a kind of reformation C
10The separating technology of heavy aromatics is specifically related to a kind of continuous multi-ply sidetrack discharge fractional distillation and extracts C
10The method of durol cut in the heavy aromatics, be a kind of through single rectifying from reformation C
10Extract the method for enrichment durol cut in the heavy aromatics raw material.
Background technology
In the conventional art for reformation C
10Comprehensive Utilization of Heavy Aromatics, comparatively general method mainly are that the cut-out light constituent is made solvent oil, extract wherein durol and naphthalene then, and remaining residual oil acts as a fuel.At reformation C
10In the heavy aromatics rectifying, generally all adopt batch fractionating, cut into light aromatic hydrocarbons C
10, different cut such as durol pregnant solution, rich naphthalene liquid, residual oil.Even there is part producing to adopt continuous rectification, but nearly all be that 2～3 rectifying tower of utilization cut the cut under the different boiling.In the cut of gained durol pregnant solution and rich naphthalene liquid are isolated durol and naphthalene respectively through the crystalline method again.Obviously, traditional technology is that the cut that obtains different boiling needs corresponding 2～3 rectifying tower, and facility investment is big, energy consumption is also very big, and yield is low, and production cost is corresponding higher.
Summary of the invention
In order to remedy existing above-mentioned deficiency of producing, the present invention will provide a kind of continuous multi-ply sidetrack discharge fractional distillation to extract C
10The method of durol cut in the heavy aromatics, this method can realize that industriallization is from reformation C
10Heavy aromatics extracts the durol cut; Through a tower; Not only obtain the durol cut, obtain rich naphthalene liquid, the solvent oil under the different boiling, the cut of residual oil simultaneously, durol and naphthalene content are all than higher in gained durol and the naphthalene pregnant solution fraction; Especially this process operation is simple, energy consumption is low, and the durol yield is high.
The scheme of accomplishing the foregoing invention task is: a kind of continuous multi-ply sidetrack discharge fractional distillation extracts C
10The method of durol cut is characterized in that in the heavy aromatics, and step is following,
(1). in the tower still of rectifying tower, add reformation C
10The heavy aromatics raw material;
(2). rectifying tower still temperature is made as 230 ℃, and tower top temperature is made as 185～186 ℃;
(3). when treating that device reaches total reflux, reformation C
10The heavy aromatics raw material is from tower middle part charging, and side line discharging port A, side line discharge port B and side line discharge port C distinguish discharging; The discharging component of side line discharging port A is C
10Light constituent, the discharging component of side line discharge port B are that durol is more than 14%; The discharging component of side line discharge port C is naphthalene 15% (being mass rate);
The parameter that the application recommends is: reformation C
10The heavy aromatics raw material is with the 3.0ml/min charging from the tower middle part, and side line discharge port B is with the 1.5ml/min discharging, and side line discharge port C is with the 0.4ml/min discharging;
(4). through after the single rectification process, side line discharge port B place durol content reaches more than 14% (wt%), and yield reaches more than 88%; Side line discharging port A, C, D place obtain C respectively simultaneously
10Light constituent, naphthalene pregnant solution, methylnaphthalene pregnant solution.
Reformation C is extracted in the continuous lateral line discharging
10Heavy aromatics durol cut processing condition:
1, tower still temperature is to extracting durol, the content of naphthalene and the influence of yield
Because reformation C
10The heavy aromatics feed composition is complicated, and boiling range is bigger.At 209 ℃ of cats head the cut extraction is arranged.Therefore, make Fig. 2 according to experimental exploring a series of tower still temperature and side line discharge port B place durol, naphthalene content and yield relation.
This shows temperature when 230 ℃ of left and right sides in the gained durol pregnant solution durol content the highest, yield is maximum.
2, theoretical number of plates of rectifying section h
1To extracting durol, the content of naphthalene and the influence of yield
Reach under the total reflux state at continuous lateral line discharging rectifying tower, rectifying section Choice Theory plate is counted h
1Be 7,15,22, keep the input and output material data constant, consider that respectively theoretical number of plates of rectifying section makes graph of a relation 3 to side line discharge port B place durol, naphthalene content and yield.
Can draw number of theoretical plate h
1The best in the time of 22, at this moment, the content and the yield of durol are the highest.
3, stripping section number of theoretical plate h
3To extracting durol, the content of naphthalene and the influence of yield
Reach under the total reflux state at continuous lateral line discharging rectifying tower, stripping section Choice Theory plate is counted h
3Be 7,15,22, keep the input and output material data constant, consider stripping section number of theoretical plate h
3Side line discharge port B place durol, naphthalene content and yield are made graph of a relation 4.
Can draw number of theoretical plate h
3The best in the time of 15, at this moment, the content and the yield of durol are the highest.
4, load is to extracting durol, the content of naphthalene and the influence of yield
Under the stable situation of continuous lateral line rectifying tower, keep the input and output material data constant, select side line discharge port B place load to be respectively 1.0ml/min; 1.5ml/min; 2.0ml/min, 2.5ml/min, the consideration load is made graph of a relation 5 to side line discharge port B place durol, naphthalene content and yield.
Can draw, side line discharge port B place load is best under the 1.5ml/min situation, and at this moment, the content and the yield of durol are the highest.
Separation reformation C of the present invention
10Heavy aromatics extracts durol cut technology, and reaction time is short, and simple to operate, energy consumption is low, and yield is high relatively.In the reaction fractionating tower temperature, stirring velocity, input and output material speed, under the reflux ratio certain condition, durol content is disposable in the durol pregnant solution can improve about 14% (wt%).
Description of drawings
Fig. 1 extracts C for the continuous lateral line discharging
10Durol cut process flow sheet in the heavy aromatics;
Fig. 2, Fig. 3 are respectively tower still temperature to extracting the influence curve figure of durol content in the durol pregnant solution;
Fig. 4, Fig. 5 are respectively theoretical number of plates of rectifying section h
1To extracting the influence curve figure of durol content in the durol pregnant solution;
Fig. 6, Fig. 7 are respectively stripping section number of theoretical plate h
3To extracting the influence curve figure of durol content in the durol pregnant solution;
Fig. 8 is that side line discharge port B place load is to extracting the influence curve figure of durol content in the durol pregnant solution.
Embodiment
Embodiment 1, and C is extracted in the continuous lateral line discharging
10Durol cut technology in the heavy aromatics is with reference to Fig. 1: in the tower still of rectifying tower, add reformation C
10The heavy aromatics raw material; Used rectifying section theoretical plate number h
1Be 22, feed plate number and the side line discharging B number of theoretical plate h of place
2Be 4, stripping section theoretical plate number h
3It is 15.Side line discharging rectifying Tata still, tower top temperature are controlled at 228～232 ℃, 185～186 ℃ respectively, and rectifying tower reaches under the total reflux stable case, contains the C of 7%～8% durol
10Heavy aromatics is from the 26th theoretical stage charging of rectifying tower.Feeding rate is 3.0ml/min, and side line discharging port A place's discharging speed is 0.8ml/min, and side line discharge port B place's discharging speed is 1.5ml/min, and side line discharge port C place's discharging speed is 0.4ml/min, and side line discharge port D place's discharging speed is 0.3ml/min.Side line discharge port B place durol is more than 14%, and side line discharge port C place naphthalene is 15% (being mass rate), and the durol yield reaches more than 88%.
Claims (1)
1. a continuous multi-ply sidetrack discharge fractional distillation extracts C
10The method of durol cut is characterized in that in the heavy aromatics, and step is following,
(1). in the tower still of rectifying tower, add reformation C
10The heavy aromatics raw material;
(2). rectifying tower still temperature is made as 230 ℃, and tower top temperature is made as 185～186 ℃;
(3). when treating that device reaches total reflux, reformation C
10The heavy aromatics raw material is from tower middle part charging, and from top to bottom, side line discharging port A, side line discharge port B and side line discharge port C distinguish discharging; The discharging component of side line discharging port A is C
10Light constituent, the discharging component of side line discharge port B is a durol, mass rate is more than 14%; The discharging component of side line discharge port C is a naphthalene, mass rate 15%;
(4). through after the single rectification process, side line discharge port B place durol mass content reaches more than 14%, and yield reaches more than 88%; Side line discharging port A, C, D place obtain C respectively simultaneously
L0Light constituent, naphthalene pregnant solution, methylnaphthalene pregnant solution;
In said (3) step, reformation C
10The heavy aromatics raw material is with the 3.0ml/min charging from the tower middle part, and side line discharge port B is with the 1.5ml/min discharging, and side line discharge port C is with the 0.4ml/min discharging;
Described C
10Heavy aromatics contains 7%～8% durol, from the 26th plate charging of rectifying tower;
To reformation C
10In the heavy aromatics raw material rectifying, at cutting reformation C
10Used rectifying section theoretical plate number h during the heavy aromatics feedstock fraction
1Be 22, feed plate number and the side line discharging B number of theoretical plate h of place
2Be 4, stripping section theoretical plate number h
3It is 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810243873A CN101486627B (en) | 2008-12-09 | 2008-12-09 | Method for extracting durene distillate from C10 heavy aromatic by continuous multistrand side line discharge fractional distillation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810243873A CN101486627B (en) | 2008-12-09 | 2008-12-09 | Method for extracting durene distillate from C10 heavy aromatic by continuous multistrand side line discharge fractional distillation |
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| CN101486627A CN101486627A (en) | 2009-07-22 |
| CN101486627B true CN101486627B (en) | 2012-10-24 |
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| CN103102239A (en) * | 2011-11-10 | 2013-05-15 | 中国石油化工股份有限公司 | Method for continuous extraction of durene from C10 heavy aromatics |
| CN114853558A (en) * | 2022-03-14 | 2022-08-05 | 中国石油天然气股份有限公司 | Comprehensive utilization method and device for C9C10 heavy aromatics |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155533A (en) * | 1996-11-25 | 1997-07-30 | 中国科学院山西煤炭化学研究所 | Synthesis of sym-tetramethylbenzene |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155533A (en) * | 1996-11-25 | 1997-07-30 | 中国科学院山西煤炭化学研究所 | Synthesis of sym-tetramethylbenzene |
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