CN1304343C - Method and device for separating 1,2,3-trimethylbenzene - Google Patents
Method and device for separating 1,2,3-trimethylbenzene Download PDFInfo
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- CN1304343C CN1304343C CN 200410019097 CN200410019097A CN1304343C CN 1304343 C CN1304343 C CN 1304343C CN 200410019097 CN200410019097 CN 200410019097 CN 200410019097 A CN200410019097 A CN 200410019097A CN 1304343 C CN1304343 C CN 1304343C
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Abstract
The present invention relates to a method and a device for separating pseudocumene. A light ends removal column is operated by negative pressure, and a product column is operated by pressurization. The device for separating pseudocumene is characterized in that a gas phase outlet arranged on the column top of the product column is connected with a reboiler arranged at the column bottom of the light ends removal column. Raw material enters the light ends removal column via a preheater 3, a reflux tank 6 arranged on the column top of the light ends removal column 1 is connected with a vacuum system 20 so that pressure in the light ends removal column is negative pressure to enable the separating boiling point of primary rectification to be reduced, and primary rectification products at the column bottom enter the product column 2 which enables the separating boiling point of purpose products to be improved by pressurizing operation. The purpose product pseudocumene becomes a gas phase and is connected with the reboiler 5 arranged at the column bottom of the light ends removal column via a pipeline from the gas phase outlet 8 arranged on the column top of the product column 2, heat coupling is performed via the reboiler 5 arranged at the column bottom, the pseudocumene is condensed from the gas phase to a liquid phase to be recovered, and the heat energy of the pseudocumene is used as a heating source for the light ends removal column 1 after the heat energy is exchanged.
Description
Affiliated technical field
The invention belongs to the fine chemistry industry separation technology field, be specifically related to a kind of separation method and device of unsym-trimethyl benzene.
Background technology
The develop rapidly of current fine chemistry industry industry, utilizing the currently available products of petroleum chemical enterprise to do further deep processing is to improve added value of product, improves the optimal path of business economic benefit.Petroleum Aromatics is come in autocatalysis processing or the resulting petroleum aromatics product of hot-work, and its boiling spread between 150～250 ℃, is to C generally
9The general name of above monocycle, dicyclo or polycyclic aromatic hydrocarbons.It is the valuable raw material of producing fine chemicals.Further separation can obtain purity very high various C8, C9 and C10 aromatic hydrocarbons to heavy aromatics, and these heavy aromaticss can obtain various derived product through further processing.
In Petroleum Aromatics, unsym-trimethyl benzene content is the highest, and can obtain highly purified product by rectificating method.Unsym-trimethyl benzene is a raw material of doing inclined to one side acid anhydride, has very high economic benefit.No matter domestic all unsym-trimethyl benzene rectifier units are packing towers at present, or tray column, all adopt the normal pressure separation process bar none, promptly adopt two rectifying tower under normal pressure raw material to be separated: raw material removes light constituent from the middle part charging of first rectifying tower, heavy constituent enter the middle part continuation separation of second rectifying tower at the bottom of its tower, obtain the unsym-trimethyl benzene product from its tower top outlet at last.Because two towers are all operated under normal pressure, boiling point between component is comparatively approaching, so the approaching key ingredient of a large amount of calorific values is heated on the one hand, and be cooled on the one hand, need very big reflux ratio and very high number of theoretical plate just can reach isolating requirement during operation, consume lot of energy so separate the unsym-trimethyl benzene product needed, thereby make the energy consumption of this production technique high.
Summary of the invention
Purpose of the present invention is to propose a kind of novel unsym-trimethyl benzene separation method and device that can cut down the consumption of energy.
The objective of the invention is to reach like this: a kind of unsym-trimethyl benzene separation method and device, its lightness-removing column adopts negative-pressure operation, and the product tower adopts pressurized operation.This unsym-trimethyl benzene tripping device, the cat head gaseous phase outlet of its product tower is connected with the tower bottom reboiler of lightness-removing column by pipeline.A kind of unsym-trimethyl benzene separation method and device, raw material enter lightness-removing column 1 through preheater 3, and the return tank of top of the tower 6 of lightness-removing column 1 connects vacuum system 20, make that lightness-removing column 1 is inner to be negative pressure so that first rectifying separation boiling point lowering, at the bottom of the tower at the beginning of the rectifying product enter product tower 2.And product tower 2 improves purpose product separation boiling point by pressurized operation, and purpose product unsym-trimethyl benzene becomes gas phase, is connected with the tower bottom reboiler 5 of lightness-removing column 1 by pipeline 9 from the gaseous phase outlet 8 of product tower 2 cats head.By tower bottom reboiler 5 thermal couplings, unsym-trimethyl benzene is that liquid phase reclaims by vapor condensation, after its thermal energy exchange as the heating source of lightness-removing column 1.
Description of drawings
Fig. 1 is a structure drawing of device of the present invention.
Wherein: 1-lightness-removing column, 2-product tower, 3-preheater, 4-fresh feed pump, the 5-tower bottom reboiler, 6-return tank of top of the tower, 7-condenser, 8-gaseous phase outlet, the 9-pipeline, 10-lightness-removing column opening for feed, 11-tower bottom outlet, 12-product tower opening for feed, 13-phegma inlet, 14-gas phase inlet, 15-tower bottom outlet, 16-gas phase inlet, 17-gaseous phase outlet, 18-phegma inlet, 19-condenser, 20-vacuum system.
Embodiment 1: a kind of unsym-trimethyl benzene separation method and device comprise lightness-removing column 1, product tower 2, preheater 3, fresh feed pump 4, condenser 7 etc., raw material enters lightness-removing column 1 through preheater 3, and the overhead drum 6 of lightness-removing column 1 connects vacuum system 20, make lightness-removing column 1 inside be negative pressure
Device of the present invention mainly is made of lightness-removing column 1 and product tower 2, preheater 3, fresh feed pump 4, condenser 7, return tank 6 and vacuum system 20 and tower bottom reboiler 5 etc.Condenser 7 one termination gaseous phase outlets 17, the other end is connected with return tank 6, and return tank 6 connects vacuum system 20.Be divided into two portions in the lightness-removing column 1, its top is rectifying section, and the bottom is a stripping section; Every part constitutes by the filler of some tower trays or certain altitude, and support, trim ring are housed between the packing section that is made of filler, and liquid header and liquid distributor are referred to as the packing tower internals.Lightness-removing column 1 opening for feed 10 is located at the middle part of rectifying tower, is connected with preheater 3, and lightness-removing column 1 top is provided with gaseous phase outlet 17 and phegma inlet 18, and the bottom then is provided with gas phase inlet 14 and bottom product outlet 11, and gas phase inlet 14 is connected with tower bottom reboiler 5.Product tower 2 also is divided into rectifying section and stripping section two portions, and its opening for feed 12 is connected with lightness-removing column 1 bottom product outlet 11 by fresh feed pump 4.Be provided with gaseous phase outlet 8 and phegma inlet 13 at the top of product tower 2, gaseous phase outlet 8 is connected with tower bottom reboiler 5 by pipeline 9; Be provided with bottom product outlet 15 and gas phase inlet 16 in product tower 2 bottoms, gas phase inlet 16 is connected with condenser 19.
Process characteristic of the present invention is to adopt transformation thermal coupling distillation process to separate the purification unsym-trimethyl benzene by heavy aromatics, concrete technology is: the heavy aromatics raw material is heated to certain temperature by preheater 3, enter in the lightness-removing column 1 by opening for feed 10, lightness-removing column 1 inside is negative pressure, vacuum tightness is that 30-40KPa makes rectifying separation boiling point lowering just, thereby make the heavy aromatics raw material remove the light constituent B before the unsym-trimethyl benzene in the raw material in lightness-removing column 1 rectifying section, light constituent B discharges from lightness-removing column 1 return tank of top of the tower 18.
After the product that obtains from the tower bottom outlet 11 of lightness-removing column 1 boosts through fresh feed pump 4, entered in the product tower 2 by opening for feed 12, product tower 2 adopts pressurization and strengthens the reflux ratio operation, and pressure can reach 150Kpa-250Kpa, and reflux ratio is 15-30.The purpose of pressurization is in order to improve the temperature of product tower 2 overhead vapor, and strengthening the reflux ratio operation then is in order to satisfy the heat balance between lightness-removing column 1 and the product tower 2; The vapor stream of top of the tower of the rectifying section of product tower 2 is drawn the tower bottom reboiler 5 that afterwards enters lightness-removing column 1 along pipeline 9 from gaseous phase outlet 8, by the heating source of thermal coupling as lightness-removing column.After the heat exchange, this vapour stream thigh obtains condensation in the tower bottom reboiler 5 of lightness-removing column 1, a phlegma part is as phegma, return product tower 2 by cat head import 13, another part vapour stream is a liquid phase by vapor condensation, then be recovered extraction as final unsym-trimethyl benzene product A, product purity reaches more than 99%.Heavy constituent C then is a byproduct at the bottom of the tower of product tower 2, obtains after reclaiming by bottom product outlet 15.
The working pressure of lightness-removing column 1 is a negative pressure, adopts the purpose of negative-pressure operation to mainly contain 2 points, the one, increase the relative volatility between each component in the raw material by vacuumizing, and reduce separating difficulty, reduce the required reflux ratio of operating process; The 2nd, can reduce the service temperature of lightness-removing column 1 by negative-pressure operation, make that the thermal coupling between two towers becomes possibility.
The present invention by utilizing product tower 2 pressurization and strengthen operation such as reflux ratio, make product tower 2 overhead vapor can be used as the origin of heat of the lightness-removing column 1 under the negative-pressure operation condition, and do not need to add in addition thermal source, energy is fully used and optimizes, can make the energy consumption of unsym-trimethyl benzene production process of the present invention reduce by 30% to 40%, and product purity can reach more than 99% than the common process energy consumption.
Claims (2)
1, a kind of unsym-trimethyl benzene separation method is characterized in that being made of following steps:
A, lightness-removing column adopt negative-pressure operation, isolate the component lighter than unsym-trimethyl benzene by the lightness-removing column top, and component enters the product tower and separates at the bottom of the tower;
B, product tower adopt pressurization, and it is 99% above unsym-trimethyl benzene that cat head obtains purity, obtains the heavy constituent product at the bottom of the tower;
C, lightness-removing column and product tower carry out thermal coupling, promptly the overhead vapours of product tower as the tower of lightness-removing column at the bottom of heating source, simultaneously the tower bottom reboiler of lightness-removing column is as the overhead condenser of product tower.
2, a kind of unsym-trimethyl benzene tripping device, comprise lightness-removing column (1) and product tower (2), form by liquid distributor, high efficiency packing section and strut member in the tower, condenser (7) the one termination gaseous phase outlets (17) that it is characterized in that lightness-removing column (1), the other end is connected with return tank (6), and return tank (6) connects vacuum system (20); Product tower opening for feed (12) is connected with lightness-removing column (1) bottom product outlet (11) by fresh feed pump (4), be provided with gaseous phase outlet (8) and phegma inlet (13) at the top of product tower (2), gaseous phase outlet (8) is connected with tower bottom reboiler (5) by pipeline (9); Product tower (2) bottom is provided with bottom product outlet (15) and gas phase inlet (16), and gas phase inlet (16) is connected with condenser (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410019097 CN1304343C (en) | 2004-04-29 | 2004-04-29 | Method and device for separating 1,2,3-trimethylbenzene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410019097 CN1304343C (en) | 2004-04-29 | 2004-04-29 | Method and device for separating 1,2,3-trimethylbenzene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1569781A CN1569781A (en) | 2005-01-26 |
| CN1304343C true CN1304343C (en) | 2007-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410019097 Expired - Fee Related CN1304343C (en) | 2004-04-29 | 2004-04-29 | Method and device for separating 1,2,3-trimethylbenzene |
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| Country | Link |
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| CN (1) | CN1304343C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1974500B (en) * | 2006-12-20 | 2010-08-18 | 天津大学 | Serial trimethyl benzene separating apparatus and method |
| CN102304011B (en) * | 2011-07-22 | 2013-09-11 | 江苏正丹化学工业股份有限公司 | Method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization |
| CN107382810B (en) * | 2017-02-22 | 2020-10-27 | 岳阳市德立机械设备有限公司 | Device and method for purifying N-methyl pyrrolidone |
| CN109232352B (en) * | 2018-09-19 | 2024-03-19 | 江阴市大洋固废处置利用有限公司 | N-methyl pyrrolidone decompression purification system and purification method |
| CN114832416B (en) * | 2022-04-01 | 2023-07-14 | 中国成达工程有限公司 | Mixed aromatic hydrocarbon vacuum rectification system and method for producing durene |
| CN115433052A (en) * | 2022-09-15 | 2022-12-06 | 北方华锦化学工业股份有限公司 | Thermal coupling method |
| CN116392835A (en) * | 2023-04-17 | 2023-07-07 | 安庆亿成化工科技有限公司 | High-efficiency pseudocumene production process |
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2004
- 2004-04-29 CN CN 200410019097 patent/CN1304343C/en not_active Expired - Fee Related
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| CN1569781A (en) | 2005-01-26 |
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