CN102746084B - Material processing method of process for preparing ethylbenzene by using ethene-containing raw materials - Google Patents
Material processing method of process for preparing ethylbenzene by using ethene-containing raw materials Download PDFInfo
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- CN102746084B CN102746084B CN201110105517.3A CN201110105517A CN102746084B CN 102746084 B CN102746084 B CN 102746084B CN 201110105517 A CN201110105517 A CN 201110105517A CN 102746084 B CN102746084 B CN 102746084B
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- absorption
- liquid distributing
- heavy hydrocarbon
- absorption agent
- ethylbenzene
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Abstract
The invention discloses a material processing method of a process for preparing ethylbenzene by using ethene-containing raw materials, characterized in that: ethene-containing raw materials are subject to absorption-desorption and then enters in an ethylbenzene device reaction section, the desorbed gas is cooled and then enters in a liquid distributing unit, after liquid distributing, the desorbed gas condensate containing absorbent and heavy hydrocarbon is extracted from the bottom of the liquid distributing unit, a part returns to the absorption-desorption unit for recycle, and the other part is delivered to a product separating section of the process for preparing ethylbenzene by using ethene-containing raw materials to separate the included absorbent and heavy hydrocarbon; or a part of desorbed gas is cooled and then enters in the liquid distributing unit, and the other part of the desorbed gas directly enters in the product separating section of the process for preparing ethylbenzene by using ethene-containing raw materials to separate the included absorbent and heavy hydrocarbon. The method has the advantages of simple process and small investment, and is especially suitable for improving the existing process for preparing ethylbenzene by using dry gases.
Description
Technical field
The invention belongs to petrochemical industry, specifically relating to a kind of for containing in ethylene raw and benzene preparing ethylbenzene by reaction technique the method removed containing heavy hydrocarbon in ethylene raw.
Background technology
Ethylbenzene is a kind of important Organic Chemicals, mainly for the production of vinylbenzene.Along with the fast development of China's economy and the raising of living standards of the people, supply falls short of demand always for ethyl benzene/styrene, 2007 ~ 2008 years, and ethyl benzene/styrene consumption is more than 4,600,000 tons/year, and wherein average annual import volume is more than 2,800,000 tons, and external dependence degree is up to 60%.Ethylbenzene is obtained through alkylated reaction by benzene and ethene, due to domestic pure ethylene resource relative shortage, solves the source of feed ethylene, especially aobvious important to production ethylbenzene process.
Catalytic cracking (FCC), catalytic pyrolysis, thermo-cracking, coking etc. are important petroleum refining processes, what these courses of processing produced contains ethene tail gas (general designation dry gas) more than 5,500,000 tons/year, wherein containing ethene about 1,000,000 tons/year, in addition containing H
2, CH
4, C
2h
6, C
3h
6, C
3h
8, CO, CO
2, H
2o, H
2s, C
4and C
5etc. component, if the resource of this part preciousness is burnt as fuel, while causing the wasting of resources, also discharge a large amount of CO
2.In order to make full use of this part resource, people have carried out a large amount of research work, develop complete set preparing ethylbenzene from dry gas technology, and this technique generally through Feedstock treating part, reactive moieties and product separation part, thus is produced and is greater than 99.8 % by weight ethylbenzene.
Dry gas raw materials pretreatment conventional process flow generally adopts the method for absorption and desorption: after in absorption tower, dry gas contacts with absorption agent is reverse, refining dry gas goes the reactive system in downstream to participate in reaction, absorption agent removes desorption tower after absorbing portion gas, separate stripping gas carrying device at desorption tower tower top, separate absorption agent at the bottom of tower and return to absorption tower and recycle.Containing the heavy hydrocarbon of 0 ~ 3.0 % by weight in dry gas raw material, heavy hydrocarbon is generally one or more in carbon four, carbon five, carbon six, first these heavy hydrocarbons are absorbed by absorption agent, because component is heavier, be difficult to desorb completely take away with stripping gas in desorption process afterwards, like this, just these heavy hydrocarbons recycling and constantly accumulate in systems in which with absorption agent is caused.About the raw material pretreatment process flow process of preparing ethylbenzene from dry gas device as Chinese patent: ZL200410021102.8, ZL200610046750.8 and ZL200910066147.X, ZL200410021102.8 discloses a kind of catalysis drying gas process for preparing ethylbenzene flow process, it has pipeline and is not corroded, and the benzene rate of recovery reaches more than 99.5%.It comprises water wash column, alkylation reaction device, rough segmentation tower, absorption tower, benzene tower, de-toluene tower, ethylbenzene tower, de multi-ethyl tower, diethylbenzene tower, interchanger, pump, tank, first catalysis drying gas is washed through water wash column, deviate from the MDEA carried in dry gas, then the reaction of alkylation reaction device is entered, reaction product is through interchanger heat exchange, enter rough segmentation tower, rough segmentation tower top non-condensable gas is through condensing cooling to 5 ~ 20 DEG C, enter absorption tower, liquid at the bottom of rough segmentation tower enters benzene tower after pump pressurization, de-toluene tower, ethylbenzene tower, de multi-ethyl tower, diethylbenzene tower order isolates recycle benzene, toluene, ethylbenzene, propyl benzene, heavy constituent and diethylbenzene, dealkylation reaction product enters benzene tower after heat exchange.ZL200610046750.8 discloses a kind of process flow for raw material pretreatment portion of catalytic dry gas produced phenylethane, it comprises propylene absorption, ethene desorb and propylene desorb three part, the de-propylene technique of raw material is increased before reactive moieties, after the catalysis drying gas access to plant of desulfurization, most of MDEA is wherein deviate from first washing, qualified dry gas enters propylene absorption tower, propylene component wherein and part ethylene component is absorbed after entering point flow container separatory; Purification dry gas absorbs tower top from propylene and discharges, three tunnels are divided to enter alkylation reaction device, one tunnel directly enters de-ethylene column as cold feed, de-ethylene column is entered about material-heat-exchanging to 10 ~ 300 at the bottom of one tunnel and depropenizer DEG C, ethylene component is wherein desorbed, ethylene-rich gas is discharged from de-ethene tower top, return after dry gas divides flow container separatory and circulate between propylene absorption tower and de-ethylene column, propylene component in absorption agent is desorbed, its main purpose is de-propylene, suppresses the side reaction of propylene and benzene.ZL200910066147.X discloses a kind of for the process for purification containing ethylene raw material gas in ethylbenzene manufactured from ethylene technique, the steps include: rare ethylene gas mixing of returning containing ethylene raw gas and catalytic cracking or cracker or enter from the bottom of absorption unit respectively, contact with the absorption agent entered from absorption unit top and refine, refined material gas enters Benzene Device reactive moieties and benzene and reacts and produce ethylbenzene, saturated absorption agent carries out the use of desorb Posterior circle, and stripping gas enters catalytic cracking or cat-cracker.
But all do not mention the heavy hydrocarbon component removed in dry gas raw material in above-mentioned technique, in device actual production process, these components are often gathered in technological process, thus it is unstable to cause desorption tower to operate, cause the desorption tower tower pressure fluctuation of device, thus carry out hidden danger for producing securing band, heavy hydrocarbon component in the absorption agent after desorb can be caused too much simultaneously, make dry gas assimilation effect bad, with heavy hydrocarbon in refining dry gas after absorbing, the coking of subsequent reactions catalyzer can be caused to accelerate, catalyst life shortens, by product can be caused to increase simultaneously, increase plant energy consumption.
Summary of the invention
The object of this invention is to provide a kind of for containing in ethylene raw and benzene preparing ethylbenzene by reaction technique the method removed containing heavy hydrocarbon in ethylene raw, this technical process is simple, invests low, is particularly suitable for transforming existing preparing ethylbenzene from dry gas technical process.
The first technical scheme of the present invention is: a kind of material processing containing ethylene raw process for preparing ethylbenzene, the steps include: to enter absorption-desorption apparatus containing ethylene raw, Benzene Device reactive moieties is entered containing the refined material of ethylene raw after absorption agent absorbs, absorption agent after desorb returns absorption-desorption apparatus and recycles, stripping gas through overcooling laggard enter liquid distributing device, liquid distributing device top stripping gas out goes out device to carry out heavy hydrocarbon recovery or makes fuel gas, after separatory containing the stripping gas lime set of absorption agent and heavy hydrocarbon bottom liquid distributing device out, a part returns absorption-desorption apparatus and recycles, another part is delivered to and is isolated contained absorption agent and heavy hydrocarbon containing the product separation part in ethylene raw process for preparing ethylbenzene, isolated absorption agent returns absorption-desorption apparatus and recycles.
The first technical scheme of the present invention is further characterized in that: after separatory containing the stripping gas lime set of absorption agent and heavy hydrocarbon bottom liquid distributing device out, a part returns absorption-desorption apparatus and recycles, another part is successively through containing tail gas absorber, recycle benzene tower and non-aromatic removal tower in ethylene raw process for preparing ethylbenzene, or directly enter tail gas absorber, recycle benzene tower or non-aromatic removal tower, isolate contained absorption agent and heavy hydrocarbon.
The second technical scheme of the present invention is: a kind of material processing containing ethylene raw process for preparing ethylbenzene, the steps include: to enter absorption-desorption apparatus containing ethylene raw, Benzene Device reactive moieties is entered containing the refined material of ethylene raw after absorption agent absorbs, absorption agent after desorb returns absorption-desorption apparatus and recycles, stripping gas is divided into two portions, a part stripping gas through overcooling laggard enter liquid distributing device, liquid distributing device bottoms returns absorption-desorption apparatus and recycles, liquid distributing device top stripping gas out goes out device to carry out heavy hydrocarbon recovery or makes fuel gas, another part stripping gas directly enters isolates contained absorption agent and heavy hydrocarbon containing the product separation part in ethylene raw process for preparing ethylbenzene, isolated absorption agent returns absorption-desorption apparatus and recycles.
The second technical scheme of the present invention is further characterized in that: stripping gas is divided into two portions, a part stripping gas through overcooling laggard enter liquid distributing device, another part stripping gas is after cooling, enter containing the tail gas absorber in ethylene raw process for preparing ethylbenzene, recycle benzene tower and non-aromatic removal tower successively, or directly enter tail gas absorber, recycle benzene tower or non-aromatic removal tower, isolate contained absorption agent and heavy hydrocarbon.
Liquid distributing device of the present invention, can adopt a point flow container, coalescer or strainer.
Product separation part of the present invention refers to the separation of reaction product.
In the present invention, absorption agent is the logistics containing one or more components in benzene, ethylbenzene, propyl benzene, the first and second benzene and diethylbenzene etc., the logistics containing one or more components in benzene, ethylbenzene, propyl benzene, the first and second benzene and diethylbenzene etc. separated in preferred reaction product.
The present invention compared with prior art, its effect is: the present invention contains on the pretreated basis of ethylene raw in tradition, shifted by material, heavy hydrocarbon is separated from non-aromatic removal tower top by the product separation part delivered to after absorption-desorption apparatus absorbs and resolves in device containing heavy hydrocarbon contained in ethylene raw gas, reach the object removing heavy hydrocarbon in raw material, thus reduce the accumulation of heavy hydrocarbon in absorption-desorption apparatus desorption tower, prevent desorption tower tower from pressing fluctuation, make device stable operation, heavy hydrocarbon component in absorption agent is reduced, thus make in the refining dry gas after absorbing, to carry heavy hydrocarbon minimizing, subsequent reactions catalyzer is made to delay coking, increase catalyst life, reduce by product to produce simultaneously, reduce device separating energy consumption.
Two schemes of the present invention, can realize the object removing heavy hydrocarbon, and in actual production, the setting according to device upstream and downstream can be selected.
Describe the present invention in detail by the drawings and specific embodiments below, but do not limit the scope of the invention.
Accompanying drawing and accompanying drawing explanation
Fig. 1 is a kind of material processing general flow chart containing ethylene raw process for preparing ethylbenzene of the present invention.
Fig. 2 is the material processing general flow chart of the present invention's another kind containing ethylene raw process for preparing ethylbenzene.
In figure: 1-contains ethylene raw, 2-absorption-desorption apparatus, 3-liquid distributing device, 4-product separation part, 5-stripping gas, 6-stripping gas water cooler, 7-stripping gas lime set, 8-non-condensable gas, 9-refined material.
Embodiment
As shown in Figure 1, containing ethylene raw 1, typical temperature is 20 ~ 40 DEG C, pressure is 0.5 ~ 1.6MPa (G), absorption-the desorption apparatus 2 of first incoming stock treating part, Benzene Device reactive moieties is entered containing the refined material 9 of ethylene raw after absorption agent absorbs, absorption agent after desorb returns absorption-desorption apparatus 2 and recycles, stripping gas 5 enters liquid distributing device 3 after stripping gas water cooler 6 is cooled to 5 ~ 40 DEG C, liquid distributing device 3 top stripping gas out goes out device to carry out heavy hydrocarbon recovery or makes fuel gas, extract out bottom liquid distributing device 3 containing the stripping gas lime set 7 of absorption agent and heavy hydrocarbon after separatory, a part returns absorption-desorption apparatus 2 and recycles as absorption agent, another part is delivered to and is isolated contained absorption agent and heavy hydrocarbon containing the product separation part 4 in ethylene raw process for preparing ethylbenzene, wherein contained heavy hydrocarbon is finally separated from product with the form of non-condensable gas 8 in product separation process, general temperature is 20 ~ 40 DEG C, pressure is 0.1 ~ 0.6MPa (G), carrying device, isolated absorption agent returns absorption-desorption apparatus 2 and recycles.
As shown in Figure 2, containing ethylene raw 1, typical temperature is 20 ~ 40 DEG C, pressure is 0.5 ~ 1.6MPa (G), absorption-the desorption apparatus 2 of first incoming stock treating part, Benzene Device reactive moieties is entered containing the refined material 9 of ethylene raw after absorption agent absorbs, absorption agent after desorb returns absorption-desorption apparatus 2 and recycles as absorption agent, stripping gas 5 is divided into two portions, wherein a part of stripping gas 5 enters liquid distributing device 3 after stripping gas water cooler 6 is cooled to 5 ~ 40 DEG C, liquid distributing device 3 bottoms returns absorption-desorption apparatus and recycles, liquid distributing device 3 top out stripping gas go out device and carry out heavy hydrocarbon recovery or make fuel gas, another part stripping gas 5 directly enters isolates contained absorption agent and heavy hydrocarbon containing the product separation part 4 in ethylene raw process for preparing ethylbenzene, wherein contained heavy hydrocarbon is finally separated from product with the form of non-condensable gas 8 in product separation process, general temperature is 20 ~ 40 DEG C, pressure is 0.1 ~ 0.6MPa (G), carrying device, isolated absorption agent returns absorption-desorption apparatus 2 and recycles.
Claims (3)
1. the material processing containing ethylene raw process for preparing ethylbenzene, it is characterized in that: enter absorption-desorption apparatus containing ethylene raw, Benzene Device reactive moieties is entered containing the refined material of ethylene raw after absorption agent absorbs, absorption agent after desorb returns absorption-desorption apparatus and recycles, stripping gas through overcooling laggard enter liquid distributing device, liquid distributing device top stripping gas out goes out device to carry out heavy hydrocarbon recovery or makes fuel gas, after separatory containing the stripping gas lime set of absorption agent and heavy hydrocarbon bottom liquid distributing device out, a part returns absorption-desorption apparatus and recycles, the tail gas absorber that another part is delivered to containing the product separation part in ethylene raw process for preparing ethylbenzene isolates contained absorption agent and heavy hydrocarbon, isolated absorption agent returns absorption-desorption apparatus and recycles, described absorption agent is containing benzene, ethylbenzene, propyl benzene, the logistics of one or more components in first and second benzene and diethylbenzene.
2. method according to claim 1, is characterized in that: described liquid distributing device is point flow container, coalescer or a strainer.
3. method according to claim 1, is characterized in that: stripping gas enters liquid distributing device after being cooled to 5 ~ 40 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110105517.3A CN102746084B (en) | 2011-04-22 | 2011-04-22 | Material processing method of process for preparing ethylbenzene by using ethene-containing raw materials |
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| CN201110105517.3A CN102746084B (en) | 2011-04-22 | 2011-04-22 | Material processing method of process for preparing ethylbenzene by using ethene-containing raw materials |
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| CN102746084B true CN102746084B (en) | 2015-01-14 |
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| CN105237320B (en) * | 2015-10-19 | 2017-04-12 | 中国石油化工股份有限公司 | Technology for preparing ethylbenzene by means of absorption and purification of high-pressure polyethylene tail gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5602290A (en) * | 1995-05-30 | 1997-02-11 | Raytheon Engineers & Constructors, Inc. | Pretreatment of dilute ethylene feedstocks for ethylbenzene production |
| CN101659590A (en) * | 2009-09-15 | 2010-03-03 | 中国石油化工集团公司 | Refining method of raw material gas containing ethene in process of preparing ethylbenzene from ethene |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5602290A (en) * | 1995-05-30 | 1997-02-11 | Raytheon Engineers & Constructors, Inc. | Pretreatment of dilute ethylene feedstocks for ethylbenzene production |
| CN101659590A (en) * | 2009-09-15 | 2010-03-03 | 中国石油化工集团公司 | Refining method of raw material gas containing ethene in process of preparing ethylbenzene from ethene |
Non-Patent Citations (1)
| Title |
|---|
| 匡永泰,高维民主编.第三章 基本化工原料生产安全技术 第五节 乙苯、苯乙烯.《石油化工安全评价技术》.2005,第248页. * |
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