CN108147941B - Liquefied gas component alkane and alkene separation system and separation method - Google Patents
Liquefied gas component alkane and alkene separation system and separation method Download PDFInfo
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- CN108147941B CN108147941B CN201711403921.2A CN201711403921A CN108147941B CN 108147941 B CN108147941 B CN 108147941B CN 201711403921 A CN201711403921 A CN 201711403921A CN 108147941 B CN108147941 B CN 108147941B
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/12—Liquefied petroleum gas
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Abstract
The invention relates to a separation system and a separation method for liquefied gas components, namely alkane and alkene, and belongs to the technical field of separation and purification of chemical products. The liquefied gas component alkane and alkene separation system comprises an alkane and alkene separation tower and the like; the liquefied gas component alkane and alkene separation method is implemented by the liquefied gas component alkane and alkene separation system. According to the liquefied gas component alkane and alkene separation system and the liquefied gas component alkane and alkene separation method, the alkane component containing 13.9% of alkene and 86.4% of alkane is arranged at the top of the packed tower; the tower kettle is olefin components, the concentration of the olefin is concentrated to 65.5 percent, the concentration of the olefin is effectively improved, and the energy consumption of the olefin utilization is greatly reduced when the olefin is reused. The separation system and the separation method of the liquefied gas component alkane and alkene have the technical effects of saving energy, reducing consumption, improving environmental protection and the like.
Description
Technical Field
The invention relates to a separation system and a separation method, in particular to a separation system and a separation method for liquefied gas component alkane and alkene, and belongs to the technical field of separation and purification of chemical products.
Background
The olefin component in the liquefied gas is used in a plurality of fields of chemical synthesis, but the concentration of the effective olefin is often very low, so that when the olefin is utilized, the liquefied gas is directly fed, the energy consumption of products is very high, and the processing cost is increased. If the material alkane in the liquefied gas is separated before the utilization of the olefin, the concentration of the effective olefin is improved, and then the olefin is utilized, the energy consumption of the olefin utilization is greatly reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a separation system and a separation method for liquefied gas components, namely alkane and alkene, and the separation system and the separation method are used for separating alkane and improving the concentration of effective alkene.
The invention aims to solve the problems and is realized by the following technical scheme:
firstly, the invention provides a liquefied gas component alkane and alkene separation system, which comprises an alkane and alkene separation tower; the alkane-alkene separation tower comprises a packed tower and a tower kettle which is positioned below the packed tower and connected with the packed tower; the tower top of the packed tower is connected with a condenser through a pipeline, and the condenser is connected with a reflux device through a pipeline; the reflux device is connected with a reflux pump through a pipeline, and the reflux pump is connected with the top of the packed tower through a pipeline; a production pipeline is arranged on a pipeline between the reflux pump and the tower top of the packed tower; the bottom of the tower kettle is connected with a steam reboiler through a pipeline, and the steam reboiler is connected with the side part of the tower kettle through a pipeline; the packed tower is sequentially provided with a first packing section, a second packing section, a third packing section, a fourth packing section and a fifth packing section from bottom to top, the height of each section of packing is 6500mm, and the packing is stainless steel corrugated wire mesh structured packing; a lower feeding hole and an upper feeding hole are respectively arranged on the first filling section and the second filling section; the lower feed port and the upper feed port are connected with a raw material input pipeline; the bottom of the tower kettle is connected with a production pump through a pipeline.
The invention further provides a liquefied gas component alkane and alkene separation method which is implemented by the liquefied gas component alkane and alkene separation system.
Specifically, the invention provides a separation method of liquefied gas component alkane and alkene, which comprises the following steps:
keeping the absolute pressure at the top of a packed tower at 750kpa and the temperature at 53.4 ℃, and using a lower feeding hole when alkane components in liquefied gas raw material components are higher than 62%; when the concentration is lower than 62%, an upper feed inlet is used;
(II) keeping the absolute pressure at the bottom of the tower kettle at 751kpa and the temperature at 57.6 ℃, providing a heat source for the tower kettle through a steam reboiler, heating the material at the bottom of the tower kettle, heating the steam reboiler by 1.0MPa steam, and keeping the reflux temperature at 53.4 ℃;
(III) condensing the tower top material of the packed tower to liquid through a condenser, and feeding the liquid into a reflux device, wherein the condenser uses circulating water to obtain heat;
(IV) refluxing a part of materials in the reflux device to the top of the packed tower through a reflux pump, and extracting a part of materials through an extraction pipeline, wherein the mass ratio of reflux to extraction is controlled to be 4.5: 1;
(V) extracting the tower kettle material by an extraction pump;
(VI) separating the materials, wherein the top of the packed tower contains alkane components containing 13.9 percent of olefin and 85.6 percent of alkane; the bottom of the tower is olefin component, and the concentration of the olefin is concentrated to 65.5 percent.
Compared with the prior art, the invention has the following beneficial effects:
according to the liquefied gas component alkane and alkene separation system and the liquefied gas component alkane and alkene separation method, the alkane component containing 13.9% of alkene and 86.0% of alkane is arranged at the top of the packed tower; the tower kettle is olefin components, the concentration of the olefin is concentrated to 65.5 percent, the concentration of the olefin is effectively improved, and the energy consumption of the olefin utilization is greatly reduced when the olefin is reused. The separation system and the separation method of the liquefied gas component alkane and alkene have the technical effects of saving energy, reducing consumption, improving environmental protection and the like.
Drawings
FIG. 1 is a schematic diagram of a liquefied gas component alkane and alkene separation system according to the present invention;
description of reference numerals: the device comprises a packed tower 1, a tower kettle 2, a condenser 3, a steam reboiler 4, a reflux device 5, a reflux pump 6, a mining pump (7), an upper feed inlet 8, a lower feed inlet 9, a first packing section A, a second packing section B, a third packing section C, a fourth packing section D and a fifth packing section E.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The liquefied gas component alkane and alkene separation system comprises an alkane and alkene separation tower; the alkane and alkene separation tower comprises a packed tower 1 and a tower kettle 2 which is positioned below the packed tower 1 and is connected with the packed tower 1; the tower top of the packed tower 1 is connected with a condenser 3 through a pipeline, and the condenser 3 is connected with a reflux device 5 through a pipeline; the reflux device 5 is connected with a reflux pump 6 through a pipeline, and the reflux pump 6 is connected with the top of the packed tower 1 through a pipeline; a production pipeline is arranged on a pipeline between the reflux pump 6 and the tower top of the packed tower 1; the bottom of the tower kettle 2 is connected with a steam reboiler 4 through a pipeline, and the steam reboiler 4 is connected with the side part of the tower kettle 2 through a pipeline; the packed tower 1 is sequentially provided with a first packing section A, a second packing section B, a third packing section C, a fourth packing section D and a fifth packing section E from bottom to top, the height of each section of packing is 6500mm, and the packing is stainless steel corrugated wire mesh structured packing; the first filling section A and the second filling section B are respectively provided with a lower feeding hole 9 and an upper feeding hole 8; the lower feed port 9 and the upper feed port 8 are connected with a raw material input pipeline; the bottom of the tower kettle 2 is connected with a production pump 7 through a pipeline.
The following is combined with a liquefied gas component alkane and alkene separation system to separate liquefied gas raw materials, and the composition of the liquefied gas raw materials is shown in table 1.
1. Raw material composition of liquefied gas
As can be seen from Table 1, the total olefin content of the feed was 37.62% and the total alkane content was 62.32%.
Keeping the absolute pressure at the top of a packed tower 1 at 750kpa and the temperature at 53.4 ℃, and using a lower feeding hole 9 when alkane components in liquefied gas raw material components are higher than 62%;
(II) keeping the absolute pressure at the bottom of the tower kettle 2 at 751kpa and the temperature at 57.6 ℃, providing a heat source for the tower kettle (2) through a steam reboiler 4, heating the material at the bottom of the tower kettle 2, heating the steam reboiler 4 by 1.0MPa steam, and keeping the reflux temperature at 53.4 ℃;
(III) condensing the tower top material of the packed tower 1 to liquid through a condenser 3, and feeding the liquid into a reflux device 5, wherein the condenser 3 uses circulating water to obtain heat;
(IV) refluxing a part of materials in the reflux device 5 to the top of the packed tower 1 through a reflux pump 6, and extracting a part of materials through an extraction pipeline, wherein the mass ratio of reflux to extraction is controlled to be 4.5: 1;
(V) extracting the tower kettle materials by an extraction pump 7;
(VI) separating the materials, wherein the top of the packed tower 1 is provided with alkane components containing 13.96 percent of olefin and 86.04 percent of alkane; column bottom 2 was the olefin component, see table 2.
2. Composition of product after separation of alkane and alkene
| Components | Mass fraction% |
| Isobutane | 13.739 |
| N-butane | 20.12 |
| N-butene | 18.27 |
| Butene of trans-butene | 16.8 |
| N-pentane | 0.584 |
| Isobutene | 17.78 |
| Cis-butenediol | 12.574 |
| 1, 3-butadiene | 0.134 |
| Total of | 100.001 |
As can be seen from Table 2, the total olefin content was increased to 65.558%, and the total alkane content was decreased to 34.442%.
The above embodiments are provided to aid in understanding the present invention and to enable any person skilled in the art to make or use the invention, and do not limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A liquefied gas component alkane and alkene separation system is characterized by comprising an alkane and alkene separation tower; the alkane and alkene separation tower comprises a packed tower (1) and a tower kettle (2) which is positioned below the packed tower (1) and connected with the packed tower; the tower top of the packed tower (1) is connected with a condenser (3) through a pipeline, and the condenser (3) is connected with a reflux device (5) through a pipeline; the reflux device (5) is connected with a reflux pump (6) through a pipeline, and the reflux pump (6) is connected with the top of the packed tower (1) through a pipeline; a production pipeline is arranged on a pipeline between the reflux pump (6) and the top of the packed tower (1); the bottom of the tower kettle (2) is connected with a steam reboiler (4) through a pipeline, and the steam reboiler (4) is connected with the side part of the tower kettle (2) through a pipeline; the packed tower (1) is sequentially provided with a first packing section (A), a second packing section (B), a third packing section (C), a fourth packing section (D) and a fifth packing section (E) from bottom to top, the packing height of each section is 6500mm, and the packing is stainless steel corrugated wire mesh structured packing; a lower feeding hole (9) and an upper feeding hole (8) are respectively arranged on the first filling section (A) and the second filling section (B); the lower feed port (9) and the upper feed port (8) are connected with a raw material input pipeline; the bottom of the tower kettle (2) is connected with a production pump (7) through a pipeline.
2. A liquefied gas component alkane and alkene separation method is implemented by the liquefied gas component alkane and alkene separation system of claim 1, and comprises the following steps:
keeping the absolute pressure at the top of the packed tower (1) at 750kpa and the temperature at 53.4 ℃, and using a lower feeding hole (9) when alkane components in liquefied gas raw material components are higher than 62%; when the concentration is lower than 62%, an upper feeding hole (8) is used;
(II) keeping the absolute pressure of the bottom of the tower kettle (2) at 751kpa and the temperature at 57.6 ℃, providing a heat source for the tower kettle (2) through a steam reboiler (4), heating the material at the bottom of the tower kettle (2), heating the steam reboiler (4) by 1.0MPa steam, and keeping the reflux temperature at 53.4 ℃;
(III) condensing the tower top material of the packed tower (1) to liquid through a condenser (3), and feeding the liquid into a reflux device (5), wherein the condenser (3) uses circulating water to obtain heat;
(IV) refluxing a part of the materials in the reflux device (5) to the top of the packed tower (1) through a reflux pump (6), and extracting a part of the materials through an extraction pipeline, wherein the mass ratio of the reflux to the extraction is controlled to be 4.5: 1;
(V) extracting the tower kettle material by an extraction pump (7);
(VI) separating the materials, wherein the top of the packed tower (1) is provided with alkane components containing 13.9 percent of olefin and 86.0 percent of alkane; the tower bottom (2) is an olefin component, and the concentration of the olefin is concentrated to 65.5 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711403921.2A CN108147941B (en) | 2017-12-22 | 2017-12-22 | Liquefied gas component alkane and alkene separation system and separation method |
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| CN201711403921.2A CN108147941B (en) | 2017-12-22 | 2017-12-22 | Liquefied gas component alkane and alkene separation system and separation method |
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| Publication Number | Publication Date |
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| CN108147941A CN108147941A (en) | 2018-06-12 |
| CN108147941B true CN108147941B (en) | 2020-09-08 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4608069A (en) * | 1984-03-12 | 1986-08-26 | Linde Aktiengesellschaft | Separation of higher boiling impurities from liquefied gases |
| CN101844960A (en) * | 2009-03-23 | 2010-09-29 | 上海傲佳能源科技有限公司 | Method for producting propylene by catalytic pyrolysis of liquefied gas |
| CN101935265A (en) * | 2009-06-29 | 2011-01-05 | 上海傲佳能源科技有限公司 | Liquefied gas catalytic pyrolysis process |
| CN102757297A (en) * | 2011-04-27 | 2012-10-31 | 中国石油化工股份有限公司 | Method for producing efficient ethylene pyrolysis feedstock by liquefied gas |
| CN104689589A (en) * | 2015-02-13 | 2015-06-10 | 杭州杭氧填料有限公司 | Vortex-line self-homogenizing regulation packing tower |
| CN204543610U (en) * | 2015-02-13 | 2015-08-12 | 杭州杭氧填料有限公司 | Vortex filament shape is from uniform regular packed tower |
| CN106495980A (en) * | 2016-09-29 | 2017-03-15 | 大连理工大学 | Gas separation unit and method based on forward and backward depropanization double-column process |
| CN107285984A (en) * | 2016-04-11 | 2017-10-24 | 中国石化工程建设有限公司 | The combination process that a kind of gas fractionation unit is expanded production and saved |
-
2017
- 2017-12-22 CN CN201711403921.2A patent/CN108147941B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4608069A (en) * | 1984-03-12 | 1986-08-26 | Linde Aktiengesellschaft | Separation of higher boiling impurities from liquefied gases |
| CN101844960A (en) * | 2009-03-23 | 2010-09-29 | 上海傲佳能源科技有限公司 | Method for producting propylene by catalytic pyrolysis of liquefied gas |
| CN101935265A (en) * | 2009-06-29 | 2011-01-05 | 上海傲佳能源科技有限公司 | Liquefied gas catalytic pyrolysis process |
| CN102757297A (en) * | 2011-04-27 | 2012-10-31 | 中国石油化工股份有限公司 | Method for producing efficient ethylene pyrolysis feedstock by liquefied gas |
| CN104689589A (en) * | 2015-02-13 | 2015-06-10 | 杭州杭氧填料有限公司 | Vortex-line self-homogenizing regulation packing tower |
| CN204543610U (en) * | 2015-02-13 | 2015-08-12 | 杭州杭氧填料有限公司 | Vortex filament shape is from uniform regular packed tower |
| CN107285984A (en) * | 2016-04-11 | 2017-10-24 | 中国石化工程建设有限公司 | The combination process that a kind of gas fractionation unit is expanded production and saved |
| CN106495980A (en) * | 2016-09-29 | 2017-03-15 | 大连理工大学 | Gas separation unit and method based on forward and backward depropanization double-column process |
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