CN101475436B - Method for producing refined naphthalene by riser type crystallization process - Google Patents
Method for producing refined naphthalene by riser type crystallization process Download PDFInfo
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- CN101475436B CN101475436B CN2009100141225A CN200910014122A CN101475436B CN 101475436 B CN101475436 B CN 101475436B CN 2009100141225 A CN2009100141225 A CN 2009100141225A CN 200910014122 A CN200910014122 A CN 200910014122A CN 101475436 B CN101475436 B CN 101475436B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for producing refined naphthalene by a vertical tube type crystallization method. The method consists of five to seven stages of crystallization processes; and each stage of the crystallization process consists of three steps of crystallization, sudation and fine melt. When a crystallization program is begun, certain amount of a material is beaten to a liquid collecting tank from a raw material tank; a naphthalene liquid circulating pump is started up; the naphthalene liquid in a vertical tube flows along the inner wall of the tube from top to bottom; a medium flows along the outer wall of the tube from top to bottom; temperature declines along the set temperature in certain gradient; naphthalene begins to gradually crystallize in the inner wall of a crystallizer tube; and the material in the liquid collecting tank is gradually reduced. When the material in the liquid collecting tank is reduced to certain amount, the crystallization process is stopped. When sudation is begun, the temperature of the medium rises in certain gradient. When the sudation amount reaches certain amount, the sudation is stopped; when the fine melt is begun, the medium enters a crystallizer at the highest temperature of 95 DEG C; simultaneously, a material with high content in a next tank is beaten to the liquid collecting tank; the naphthalene liquid circulating pump is started up; and the naphthalene liquid is circulated and accelerates fine melt in the crystallizer tube. The method has stable production, high product quality, simple process flow, obvious energy-saving effect, high automation degree and no pollution.
Description
Technical field:
The present invention relates to the refined naphthalene working method, relate in particular to and utilize riser type crystallization process to produce the method for refined naphthalene.
Background technology:
Solvent crystallization method is again adopted in refined naphthalene production usually; This method generally comprises following operation: thick naphthalene solubilizing agent dissolves; Send into crystallization again in the mold, the crystallization naphthalene is sent into whizzer separate, use solvent wash crystal surface impurity and mother liquor simultaneously; Isolated solvent recuperation, isolated refined naphthalene promptly becomes product as refined naphthalene after drying.For a long time, people generally believe that naphthalene forms druse at the mold intercrystalline; Form enclosed space between crystal, can not remove mother liquor and washing, so must the crystallization naphthalene taken out even smash and send into whizzer; Can carry out solid-liquid separation and washing, the complex equipments that therefore causes refined naphthalene to produce, technology is loaded down with trivial details; It is bigger that solvent scatters and disappears, and can not closed operation, environment formed pollute.
Summary of the invention:
The objective of the invention is to, overcome the weak point of prior art, a kind of method of utilizing riser type crystallization process to produce refined naphthalene is provided, simplified production technique, the quality of refined naphthalene product is high, and level of automation is high, and energy-saving effect is remarkable, and is pollution-free.
The method of utilizing riser type crystallization process to produce refined naphthalene of the present invention includes five to seven grades of crystallisation processs and forms, and each grade crystallisation process all is made up of crystallization, sweating and three steps of fine melt.During the beginning crystallization procedure; Squeeze into a certain amount of material by raw material tank to intercepting basin, naphthalene liquid recycle pump starts, and naphthalene liquid flows along inside pipe wall in vertical tube from top to bottom; Medium flows along the pipe outer wall from top to bottom; Temperature is certain gradient with the temperature of setting and descends, and naphthalene begins crystallization gradually in the Crystallizer tube inwall, and material reduces gradually in the intercepting basin.When material in the intercepting basin drops to when a certain amount of, crystallisation process stops.Sweat over, this is the process that impure material raises and discharges with temperature, medium temperature is certain gradient and rises.When diaphoretic volume reaches a certain amount of, stop sweating; Beginning fine melt, medium are with 95 ℃ of entering molds of top temperature, and high next jar material of content is squeezed into intercepting basin simultaneously, and naphthalene liquid recycle pump starts, and the fine melt of naphthalene is quickened in the middle circulation in Crystallizer tube of naphthalene liquid.When recycle pump naphthalene liquid temperature out was elevated to certain temperature, fine melt stopped, and medium temperature is reduced to certain temperature, and next stage begins, and its process is identical with upper level.Adopt 5 to 7 grades of crystallizations, can produce the product of country-level article standard.
The method of utilizing riser type crystallization process to produce refined naphthalene of the present invention, it is a little to produce to stablize, and quality product is high, and on average more than 99.3%, colourity is low for naphthalene content, and technical process is simple, and energy-saving effect is obvious, and level of automation is high, and is pollution-free.
Description of drawings:
Accompanying drawing is the process flow sheet that utilizes riser type crystallization process to produce the method for refined naphthalene according to the invention.1-crystallization 2-sweating 3-fine melt
Embodiment:
Existing with reference to accompanying drawing 1, explain as follows in conjunction with embodiment: the method for utilizing riser type crystallization process to produce refined naphthalene of the present invention, include five to seven grades of crystallisation processs and form, each grade crystallisation process all is made up of crystallization 1, sweating 2 and 3 three steps of fine melt.During beginning crystallization 1 program; Squeeze into a certain amount of material by raw material tank to intercepting basin, naphthalene liquid recycle pump starts, and naphthalene liquid flows along inside pipe wall in vertical tube from top to bottom; Medium flows along the pipe outer wall from top to bottom; Temperature is certain gradient with the temperature of setting and descends, and naphthalene begins crystallization gradually in the Crystallizer tube inwall, and material reduces gradually in the intercepting basin.When material in the intercepting basin drops to when a certain amount of, crystallization 1 process stops.Sweat over 2, this is the process that impure material raises and discharges with temperature, medium temperature is certain gradient and rises.When diaphoretic volume reaches a certain amount of, stop sweating 2; Beginning fine melt 3, medium are with 95 ℃ of entering molds of top temperature, and high next jar material of content is squeezed into intercepting basin simultaneously, and naphthalene liquid recycle pump starts, and the fine melt of naphthalene is quickened in the middle circulation in Crystallizer tube of naphthalene liquid.When recycle pump naphthalene liquid temperature out was elevated to certain temperature, fine melt 3 stopped, and medium temperature is reduced to certain temperature, and next stage begins, and its process is identical with upper level.Adopt 5 to 7 grades of crystallizations, can produce the product of country-level article standard.The method of utilizing riser type crystallization process to produce refined naphthalene of the present invention, it is a little to produce to stablize, and quality product is high, and on average more than 99.3%, colourity is low for naphthalene content, and technical process is simple, and energy-saving effect is obvious, and level of automation is high, and is pollution-free.
Two kinds of refined naphthalenes of riser type crystallization and box crystallization
The contrast of working method
At present producing refined naphthalene mainly is box crystallization process, and the relative merits of riser type crystallization process and two kinds of methods of box crystallization process that at present will pass through experiment are following:
| Advantage | Shortcoming | |
| Box crystallization process | Invest less, instant effect, simple to operate. | Product contains that the naphthalene amount is lower, and colourity is relatively poor, and yield is low, average yield 86%. |
| Riser type crystallization process | Average yield is high, and quality product is high, and colourity is low, and is pollution-free, and level of automation is high, and good energy-conserving effect is operated simple and easyly, and process cost is low. | Facility investment is bigger. |
The comparison of riser type crystallization process and box crystallization process:
Claims (1)
1. utilize riser type crystallization process to produce the method for refined naphthalene, it is characterized in that it and be made up of five to seven grades of crystallisation processs, each grade crystallisation process all is to have crystallization (1), sweating (2) and (3) three steps of fine melt to form; During beginning crystallization (1) program; Squeeze into a certain amount of material by raw material tank to intercepting basin, naphthalene liquid recycle pump starts, and naphthalene liquid flows along inside pipe wall in vertical tube from top to bottom; Medium flows along the pipe outer wall from top to bottom; Temperature is certain gradient with the temperature of setting and descends, and naphthalene begins crystallization gradually in the Crystallizer tube inwall, and material reduces gradually in the intercepting basin; When material in the intercepting basin drops to when a certain amount of, crystallisation process stops; Sweat over (2), medium temperature are certain gradient and rise; When diaphoretic volume reaches a certain amount of, stop sweating (2); Beginning fine melt (3), medium are with 95 ℃ of entering molds of top temperature, and high next jar material of content is squeezed into intercepting basin simultaneously; Naphthalene liquid recycle pump starts; The fine melt of naphthalene is quickened in the middle circulation in Crystallizer tube of naphthalene liquid, and when recycle pump naphthalene liquid temperature out was elevated to certain temperature, fine melt (3) stopped; Medium temperature is reduced to certain temperature, and next stage begins, and its process is identical with upper level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100141225A CN101475436B (en) | 2009-02-02 | 2009-02-02 | Method for producing refined naphthalene by riser type crystallization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100141225A CN101475436B (en) | 2009-02-02 | 2009-02-02 | Method for producing refined naphthalene by riser type crystallization process |
Publications (2)
| Publication Number | Publication Date |
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| CN101475436A CN101475436A (en) | 2009-07-08 |
| CN101475436B true CN101475436B (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100141225A Expired - Fee Related CN101475436B (en) | 2009-02-02 | 2009-02-02 | Method for producing refined naphthalene by riser type crystallization process |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112675568B (en) * | 2019-10-18 | 2022-04-05 | 中国石油化工股份有限公司 | Separation and purification device and separation and purification method |
| CN115417743B (en) * | 2022-08-25 | 2024-01-30 | 中建安装集团有限公司 | Fractional melting crystallization process for industrial naphthalene refined naphthalene |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050829A (en) * | 1990-11-29 | 1991-04-24 | 天津大学 | Parametric pump fractional crystallization method and pfc crystallizer |
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- 2009-02-02 CN CN2009100141225A patent/CN101475436B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050829A (en) * | 1990-11-29 | 1991-04-24 | 天津大学 | Parametric pump fractional crystallization method and pfc crystallizer |
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Granted publication date: 20120606 Termination date: 20130202 |