CN102826702A - Method for removing a small amount of benzene or toluene in benzene and methanol alkylation reaction process water - Google Patents
Method for removing a small amount of benzene or toluene in benzene and methanol alkylation reaction process water Download PDFInfo
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- CN102826702A CN102826702A CN2012103126943A CN201210312694A CN102826702A CN 102826702 A CN102826702 A CN 102826702A CN 2012103126943 A CN2012103126943 A CN 2012103126943A CN 201210312694 A CN201210312694 A CN 201210312694A CN 102826702 A CN102826702 A CN 102826702A
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- benzene
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- oil
- methylbenzene
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Abstract
The invention relates to a method for removing a small amount of benzene or toluene in benzene and methanol alkylation reaction process water. The method includes the steps: (1), feeding water discharged from a return tank at the tower top of a benzene and toluene recovery tower into an efficient oil-water separator for oil-water separation; (2), feeding the oil phase separated from the top of the efficient oil-water separator into a benzene/toluene recovery tank, mixing the water phase separated from the bottom of the efficient oil-water separator with a small amount of water discharged from the tank bottom of the benzene/toluene recovery tank, and feeding the mixture into a process water stripper after the mixture is subjected to temperature rising by a stripper heat exchanger; and (3) feeding oil at the top of the stripper into the benzene/toluene recovery tank after the oil is cooled by the heat exchanger, and mixing the oil with the oil phase separated from the efficient oil-water separator prior to mixing the mixture with alkylation raw materials to enter a reactor for continuous reaction. Water separated from the bottom of the stripper can reach the primary standard of the national comprehensive sewage water discharge standard.
Description
Technical field
The invention belongs to a kind of process water treatment process of simplification, relate to a kind of method of from benzene alcohol alkylation reaction technique water, removing a small amount of benzene or toluene particularly.
Background technology
Process water in benzene and the methanol alkylation reaction process is separated by benzene toluene regenerating column return tank of top of the tower.Because the return tank of top of the tower temperature is higher; Benzene, toluene and emulsifying water are serious, and benzene in the water that cuts out, toluene level are higher, can reduce the treatment effect in sewage-farm greatly if directly be disposed to the sewage-farm; Also can cause the waste of benzene and toluene, therefore need handle.
Chinese patent CN 101260020B has described a kind of method that contains benzene wastewater treatment and benzene recovery.This method treatment effect is good, but complicated operation, sorbent material needs regular regeneration, and the benzene behind the desorption needs deep cooling to reclaim, and energy consumption is higher.
Summary of the invention
The objective of the invention is provides the low process water of the simple energy consumption of a kind of technology to handle and reclaim the method for benzene or toluene to containing benzene, complicated, the energy consumption problem of higher of toluene method of wastewater treatment at present.The present invention realizes according to following purpose:
A kind of method of from benzene alcohol alkylation reaction technique water, removing a small amount of benzene or toluene comprises the steps:
The water of (1) being discharged by benzene toluene regenerating column return tank of top of the tower gets into efficient water-and-oil separator and carries out oily water separation;
(2) the isolated oil phase in efficient water-and-oil separator top gets into and reclaims the benzene/methylbenzene jar, and the isolated water in bottom is sent into process water stripper with the mixes with small amount of water of discharging at the bottom of the recovery benzene/methylbenzene jar jar after the stripping tower interchanger heats up;
(3) the stripping tower overhead oil is sent into after the interchanger cooling and is reclaimed the benzene/methylbenzene jar, mixes with the isolated oil phase of efficient water-and-oil separator, is mixed into reactor drum with raw material for alkylation and continues reaction; The isolated water in stripping tower bottom can reach national sewage comprehensive discharge primary standard;
The water that adopts efficient water-and-oil separator that benzene toluene regenerating column return tank of top of the tower is discharged carries out the profit pre-separation, and free benzene/methylbenzene content is lower than 5ppm in the water, and isolated benzene and toluene can satisfy the requirement of benzene alcohol alkylated reaction;
Adopt stripping tower further to remove free benzene/methylbenzene and dissolving benzene/methylbenzene in the water, benzene and toluene level drop to below the 1ppm in the water, and benzene that stripping goes out and toluene can satisfy the requirement of benzene alcohol alkylated reaction.
The present invention adopts efficient water-and-oil separator pre-treatment benzene alcohol alkylation reaction technique water, and the breakdown of emulsion that need not to lower the temperature removes free benzene and toluene in the water, adopts the method for stripping tower rectifying further to remove benzene and the toluene that contains in the water again.Water after treatment can reach emission request, and the benzene of recovery and toluene can satisfy the requirement of benzene alcohol alkylated reaction.
Advantage of the present invention is to have reduced processing unit, has reduced floor space, and has energy-conservation, simple to operate, benzene or toluene recovery advantages of higher.
Description of drawings
Fig. 1 is a process flow diagram of the present invention; Each digital connotation is following among the figure:
1 return tank
2 fresh feed pumps
3 efficient water-and-oil separators
4 reclaim the benzene/methylbenzene jar
5 stripping towers
6 stripping tower interchanger
7 interchanger
8 benzene and toluene
9 oil phase benzene and toluene
10 oil phase benzene and toluene
11 steam
12 isolated water.
Embodiment
Below in conjunction with accompanying drawing method of the present invention is described in more detail.As shown in Figure 1, concrete steps:
1, the benzene and the toluene (8) that are come out by benzene toluene regenerating column cat head get in the benzene toluene tower return tank (1) after cooling; Water and oil phase layering; Water is discharged by return tank (1) bottom, and oil phase benzene and toluene (a 9) part is back to a benzene toluene tower part and turns back to alkylation reactor.
2, the water of benzene toluene return tank (1) discharge is sent into efficient water-and-oil separator (3) by process water fresh feed pump (2)., send into and reclaim benzene/methylbenzene jar (4) from going out oil phase benzene and toluene in efficient water-and-oil separator (3) top portion.Efficient water-and-oil separator (3) bottom is isolated water and is reclaimed the mixes with small amount of water that discharge benzene/methylbenzene jar (4) bottom, behind stripping tower interchanger (6) heat temperature raising, sends into process water stripper (5).
3, as the stripping medium, cat head is isolated benzene and toluene to stripping tower (5) with steam (11), after interchanger (7) cooling, sends into and reclaims benzene/methylbenzene jar (4), and the oil phase benzene and the toluene (10) that reclaim in the benzene/methylbenzene jar (4) turn back to alkylation reactor; Separate water outlet (12) at the bottom of stripping tower (5) tower, its benzene and toluene level can reach national sewage comprehensive discharge primary standard less than 1ppm.
Claims (3)
1. a method of from benzene alcohol alkylation reaction technique water, removing a small amount of benzene or toluene is characterized in that comprising the steps:
The water of (1) being discharged by benzene toluene regenerating column return tank of top of the tower gets into efficient water-and-oil separator and carries out oily water separation;
(2) the isolated oil phase in efficient water-and-oil separator top gets into and reclaims the benzene/methylbenzene jar, and the isolated water in bottom is sent into process water stripper with the mixes with small amount of water of discharging at the bottom of the recovery benzene/methylbenzene jar jar after the stripping tower interchanger heats up;
(3) the stripping tower overhead oil is sent into after the interchanger cooling and is reclaimed the benzene/methylbenzene jar, mixes with the isolated oil phase of efficient water-and-oil separator, is mixed into reactor drum with raw material for alkylation and continues reaction; The isolated water in stripping tower bottom can reach national sewage comprehensive discharge primary standard.
2. the method for claim 1; It is characterized in that the water that adopts efficient water-and-oil separator that benzene toluene regenerating column return tank of top of the tower is discharged carries out the profit pre-separation; Free benzene/methylbenzene content is lower than 5ppm in the water, and isolated benzene and toluene can satisfy the requirement of benzene alcohol alkylated reaction.
3. the method for claim 1; It is characterized in that adopting stripping tower further to remove free benzene/methylbenzene and dissolving benzene/methylbenzene in the water; Benzene and toluene level drop to below the 1ppm in the water, and benzene that stripping goes out and toluene can satisfy the requirement of benzene alcohol alkylated reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103126943A CN102826702A (en) | 2012-08-30 | 2012-08-30 | Method for removing a small amount of benzene or toluene in benzene and methanol alkylation reaction process water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103126943A CN102826702A (en) | 2012-08-30 | 2012-08-30 | Method for removing a small amount of benzene or toluene in benzene and methanol alkylation reaction process water |
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| CN102826702A true CN102826702A (en) | 2012-12-19 |
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| CN2012103126943A Pending CN102826702A (en) | 2012-08-30 | 2012-08-30 | Method for removing a small amount of benzene or toluene in benzene and methanol alkylation reaction process water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106957083A (en) * | 2017-03-06 | 2017-07-18 | 聊城市鲁西化工工程设计有限责任公司 | A kind of static oily-water seperating equipment of anti-back-mixing, piece-rate system and separation method |
| CN107501029A (en) * | 2017-08-07 | 2017-12-22 | 青岛海湾集团有限公司 | A kind of toluene recovery device |
| CN112209799A (en) * | 2020-10-14 | 2021-01-12 | 潍坊弘润石化科技有限公司 | Benzene-containing wastewater recycling technology |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201633A (en) * | 1977-05-12 | 1980-05-06 | Snamprogetti S.P.A. | Separating aromatic hydrocarbons from mixtures containing them |
| CN101525263A (en) * | 2008-03-03 | 2009-09-09 | 艾博特(厦门)设备工程有限公司 | Method for continuously recovering unreacted aromatic hydrocarbon in process of manufacturing aromatic carboxylic acid |
| CN101624327A (en) * | 2009-08-14 | 2010-01-13 | 山西恒扬科技有限公司 | Method for preparing methylbenzene or dimethylbenzene by alkylating benzene with methanol |
| CN101883737A (en) * | 2007-11-29 | 2010-11-10 | 道达尔石化法国公司 | Process for purification of an aqueous phase containing polyaromatics |
| WO2012025393A1 (en) * | 2010-08-12 | 2012-03-01 | Basf Se | Method for treating wastewaters from the reprocessing of crude aromatic nitro compounds |
| CN102372581A (en) * | 2010-08-23 | 2012-03-14 | 中国石油化工股份有限公司 | Water distribution method of reaction product in preparation of ethylbenzene by ethanol method |
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2012
- 2012-08-30 CN CN2012103126943A patent/CN102826702A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201633A (en) * | 1977-05-12 | 1980-05-06 | Snamprogetti S.P.A. | Separating aromatic hydrocarbons from mixtures containing them |
| CN101883737A (en) * | 2007-11-29 | 2010-11-10 | 道达尔石化法国公司 | Process for purification of an aqueous phase containing polyaromatics |
| CN101525263A (en) * | 2008-03-03 | 2009-09-09 | 艾博特(厦门)设备工程有限公司 | Method for continuously recovering unreacted aromatic hydrocarbon in process of manufacturing aromatic carboxylic acid |
| CN101624327A (en) * | 2009-08-14 | 2010-01-13 | 山西恒扬科技有限公司 | Method for preparing methylbenzene or dimethylbenzene by alkylating benzene with methanol |
| WO2012025393A1 (en) * | 2010-08-12 | 2012-03-01 | Basf Se | Method for treating wastewaters from the reprocessing of crude aromatic nitro compounds |
| CN102372581A (en) * | 2010-08-23 | 2012-03-14 | 中国石油化工股份有限公司 | Water distribution method of reaction product in preparation of ethylbenzene by ethanol method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106957083A (en) * | 2017-03-06 | 2017-07-18 | 聊城市鲁西化工工程设计有限责任公司 | A kind of static oily-water seperating equipment of anti-back-mixing, piece-rate system and separation method |
| CN106957083B (en) * | 2017-03-06 | 2019-11-12 | 聊城市鲁西化工工程设计有限责任公司 | A kind of anti-back-mixing static state oily-water seperating equipment, separation system and separation method |
| CN107501029A (en) * | 2017-08-07 | 2017-12-22 | 青岛海湾集团有限公司 | A kind of toluene recovery device |
| CN112209799A (en) * | 2020-10-14 | 2021-01-12 | 潍坊弘润石化科技有限公司 | Benzene-containing wastewater recycling technology |
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Application publication date: 20121219 |