CN1580017A - Process for preparing methylnaphthalene by rectification - Google Patents
Process for preparing methylnaphthalene by rectification Download PDFInfo
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- CN1580017A CN1580017A CN 200410044823 CN200410044823A CN1580017A CN 1580017 A CN1580017 A CN 1580017A CN 200410044823 CN200410044823 CN 200410044823 CN 200410044823 A CN200410044823 A CN 200410044823A CN 1580017 A CN1580017 A CN 1580017A
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- methylnaphthalene
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Abstract
The invention refers to a kind of chemical technology, especially a kind of method of producing methylnaphthalene by rectification, and chooses the still residue left by the rectification of carbon-10 heavy aromatics as the raw material. The invention chooses the still residue left by the rectification of carbon-10 heavy aromatics, which once was forgotten by people, as the raw material of the technology of producing methylnaphthalene by rectification and reuses the flotsam. The sulphur content of the turnoff is less than 5ppm and the methylnaphthalene content is over 63%.
Description
Technical field
The present invention relates to a kind of chemical technique, particularly a kind of rectifying prepares the technology of methylnaphthalene.
Background technology
Methylnaphthalene is a kind of industrial solvent of excellent property, have that solvency power is strong, toxicity is low, smell is little, boiling point is high, volatilization slowly, not moisture and alkene, not chloride and heavy metal, characteristics such as chemical physics stable performance, the solvent that also can be used for clean-out system, efficient solvent, sterilant and the rubber resin of machinery, has higher utility value, but few because of the preparation method of product, supply falls short of demand to cause product.Past people is extracted methylnaphthalene from coal tar, owing to contain a large amount of sulphur compositions and other impurity in the coal tar, before the process for refining that carries out methylnaphthalene, must be earlier through desulfurization and two operations of separating impurity, this has brought higher cost to production.
Summary of the invention
The invention reside in a kind of purity height of invention, a kind of rectifying that production cost is low prepares the technology of methylnaphthalene.
Still defective material after the present invention extracts with C+10 heavy aromatic hydrocarbon rectifying is a raw material.
The still defective material that the present invention will be in the past extracted behind the solvent by the rectifying of people's depleted C+10 heavy aromatic hydrocarbon prepares the raw materials technology of methylnaphthalene as rectifying, can turn waste into wealth, and sulfur-bearing is lower than 5ppm in the finished product methylnaphthalene, and methylnaphthalene purity is higher than 63%.
The rectification process of limit of the present invention backflow limit extraction; can realize the continuous rectification technology; select suitable process conditions, constantly occur vaporization phenomenon in the rectifying tower, owing to do not stop to reflux; be in the vapor-liquid equilibrium state in the tower; each product is constantly successively separated, and is through cat head, side line, the continuous extraction of tower still, down stable at rectifying tower; methylnaphthalene is by the continuous extraction of side line, and its content can reach 80%.
The boiling range of rectifying raw material is 185～350 ℃.
In addition, each processing parameter is as follows:
Rectification temperature is 175～220 ℃; Rectifying pressure is negative pressure 0.083 ± 0.02Mpa; The theoretical plate number of rectifying tower is 80～120; Material inlet is at 1/5～3/4 place of theoretical stage number, and methylnaphthalene extraction mouth is at 1/6 place of theoretical stage number.。
Specific embodiment
Example 1: the continuously feeding rectifying tower, rectifying section is the twine filled section, and 60 blocks of theoretical trays are arranged, and stripping section has 20 blocks of theoretical trays, and premier's opinion stage number of rectifying tower is 80, and methylnaphthalene extraction mouth is at 1/6 place of premier's opinion column plate.
Under the negative pressure 0.081Mpa, with the thermal oil is that the energy heats, pump into the still defective material after C+10 heavy aromatic hydrocarbon rectifying is extracted, the boiling range of rectifying raw material is 185～350 ℃, and inlet amount is 1000L/h, and tower still temperature is 207 ℃, tower top temperature is 179 ℃, the raw material feeding temperature is 102 ℃, and the methylnaphthalene produced quantity is 550L/h, and the cat head produced quantity is 150L/h, tower still produced quantity 150L/h, cat head extraction reflux ratio 1: 3 is through check analysis content, wherein, water 0.03%, S-180# solvent 17.30%, NAPTHALENE FLAKES. (INDUSTRIAL GRADE 18.03%, methylnaphthalene 64.31%.
Example 2: the continuously feeding rectifying tower, rectifying section is the twine filled section, and 90 blocks of theoretical trays are arranged, and stripping section has 30 theoretical stages, and premier's opinion stage number of rectifying tower is 120, and methylnaphthalene extraction mouth is at 1/6 place of premier's opinion column plate.
Press below the negative 0.082Mpa, with the thermal oil is that the energy heats, pump into the still defective material after C+10 heavy aromatic hydrocarbon rectifying is extracted, the boiling range of rectifying raw material is 185～350 ℃, and inlet amount is 1000L/h, and tower still temperature is 211 ℃, tower top temperature is 180 ℃, the raw material feeding temperature is 111 ℃, and the methylnaphthalene produced quantity is 500L/h, and the cat head produced quantity is 200L/h, tower still produced quantity 300L/h, cat head extraction reflux ratio 1: 4 is through check analysis content, wherein, water 0.027%, S-180# solvent 13.50%, NAPTHALENE FLAKES. (INDUSTRIAL GRADE 16.4%, methylnaphthalene 70.0%.
Example 3: the continuously feeding rectifying tower, rectifying section is the twine filled section, and 87 blocks of theoretical trays are arranged, and stripping section has 30 theoretical stages, and premier's opinion stage number of rectifying tower is 117, and methylnaphthalene extraction mouth is at 1/6 place of premier's opinion column plate.。
Press under the negative 0.094Mpa, with the thermal oil is that the energy heats, pump into the still defective material after C+10 heavy aromatic hydrocarbon rectifying is extracted, the boiling range of rectifying raw material is 185～350 ℃, and inlet amount is 1000L/h, and tower still temperature is 220 ℃, tower top temperature is 184 ℃, the raw material feeding temperature is 103 ℃, and the methylnaphthalene produced quantity is 550L/h, and the cat head produced quantity is 200L/h, tower still produced quantity 150L/h, cat head extraction reflux ratio 1: 6 is through check analysis content, wherein, water 0.013%, S-180# solvent 10.40%, NAPTHALENE FLAKES. (INDUSTRIAL GRADE 9.5%, methylnaphthalene 79.17%.
Claims (7)
1, a kind of rectifying prepares the technology of methylnaphthalene, and it is characterized in that adopting the still defective material after C+10 heavy aromatic hydrocarbon rectifying is extracted is raw material.
2, rectifying according to claim 1 prepares the technology of methylnaphthalene, it is characterized in that above-mentioned raw materials is carried out the rectification process of limit backflow limit extraction.
3, rectifying according to claim 2 prepares the technology of methylnaphthalene, and the boiling range that it is characterized in that described rectifying raw material is 185～350 ℃.
4, rectifying according to claim 2 prepares the technology of methylnaphthalene, it is characterized in that described rectification temperature is 175～220 ℃.
5, rectifying according to claim 2 prepares the technology of methylnaphthalene, it is characterized in that described rectifying pressure is negative pressure 0.083 ± 0.02Mpa.
6, rectifying according to claim 2 prepares the technology of methylnaphthalene, and the theoretical plate number that it is characterized in that described rectifying tower is 80～120.
7, rectifying according to claim 2 prepares the technology of methylnaphthalene, it is characterized in that 1/5～3/4 place of material inlet in theoretical stage number, and methylnaphthalene extraction mouth is at 1/6 place of theoretical stage number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410044823 CN1580017A (en) | 2004-05-20 | 2004-05-20 | Process for preparing methylnaphthalene by rectification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410044823 CN1580017A (en) | 2004-05-20 | 2004-05-20 | Process for preparing methylnaphthalene by rectification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1580017A true CN1580017A (en) | 2005-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410044823 Pending CN1580017A (en) | 2004-05-20 | 2004-05-20 | Process for preparing methylnaphthalene by rectification |
Country Status (1)
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| CN (1) | CN1580017A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134500A (en) * | 2011-02-17 | 2011-07-27 | 广东新华粤石化股份有限公司 | Method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar |
| CN108531210A (en) * | 2018-03-05 | 2018-09-14 | 常熟联邦化工股份有限公司 | A kind of preparation method of high methyl naphthalene aromatic solvent naphtha |
-
2004
- 2004-05-20 CN CN 200410044823 patent/CN1580017A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134500A (en) * | 2011-02-17 | 2011-07-27 | 广东新华粤石化股份有限公司 | Method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar |
| CN102134500B (en) * | 2011-02-17 | 2013-05-15 | 广东新华粤石化股份有限公司 | Method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar |
| CN108531210A (en) * | 2018-03-05 | 2018-09-14 | 常熟联邦化工股份有限公司 | A kind of preparation method of high methyl naphthalene aromatic solvent naphtha |
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