CN104607024A - Treatment method of acid-containing tail gas of chlorohydrination reaction - Google Patents
Treatment method of acid-containing tail gas of chlorohydrination reaction Download PDFInfo
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- CN104607024A CN104607024A CN201410816430.0A CN201410816430A CN104607024A CN 104607024 A CN104607024 A CN 104607024A CN 201410816430 A CN201410816430 A CN 201410816430A CN 104607024 A CN104607024 A CN 104607024A
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- chlorohydrination
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Abstract
The invention relates to a treatment method of acid-containing tail gas of chlorohydrination reaction. The treatment method comprises the following steps: removing hydrogen chloride and residue chlorine of the acid-containing tail gas of chlorohydrination reaction through an alkaline washing tower firstly, cooling by a circulation gas cooler, removing liquid-phase components in a gas-liquid separator, introducing gas-phase components into a circulation gas blast blower for increasing the pressure, then mixing with chlorine gas and industrial water, and introducing the mixture into a second chlorohydrination tower for reaction, introducing the chlorine gas and hydrogen chloride which do not react at the top of the chlorohydrination tower into the washing tower, spraying industrial water to wash and absorb the gas, then exhausting non-condensable gas. The treatment method of acid-containing tail gas of chlorohydrination reaction is simple and convenient in process, low in equipment cost, good in production environment and low in overall device investment.
Description
Technical field
The present invention relates to chemical technology field, be specifically related to chlorohydrin action in a kind of propylene oxide production process and contain the processing method of sour tail gas.
Background technology
The raw material of production of propylene oxide is propylene and chlorine.Propylene and chlorine carry out chlorohydrin action in chlorohydrination reactor.In this course of reaction, unstripped gas can not complete reaction, therefore after chlorohydrin action, still containing the hydrogen chloride generated in a small amount of propylene, residual chlorine, inert gas and course of reaction in reaction end gas.In cost of material, propylene accounts for 95%.For improving device economy, maximum using propylene, recycling containing sour tail gas chlorohydrin action, conventional method is:
Cooling through recycle gas cooler containing sour tail gas of chlorohydrin action, removes liquid phase component in gas-liquid separator, and gaseous component enters the second chlorohydrination tower after mixing with chlorine and industry water after entering recycle gas blower boosting and reacts.In the reaction of the second chlorohydrination tower, for ensureing that propylene fully reacts, make chlorine excessive.Second chlorohydrination column overhead tail gas enters caustic wash tower, by alkali lye spray washing, absorbs emptying after excessive chlorine and hydrogen chloride.
Because chlorohydrin action contains hydrogen chloride and residual chlorine containing in sour tail gas, therefore whole chlorohydrin action all needs to consider acid corrosion and chloride ion corrosion containing the equipment material involved by sour vent gas treatment flow process.Therefore equipment material has all selected the titanium alloy that cost is very high, as equipment such as recycle gas cooler, recycle gas blower and caustic wash towers, appliance arrangement is invested too high, economy is lower.
In sum, in conventional method, chlorohydrin action haves much room for improvement containing the processing method of sour tail gas.
Summary of the invention
The present invention is intended to the technological deficiency for prior art, provides a kind of propylene reclaimed with less cost in reaction end gas, thus realizes reducing appliance arrangement cost of investment, improve the object of device economy.
In order to realize above technical purpose, the present invention by the following technical solutions:
In propylene oxide production process, chlorohydrin action is containing a processing method for sour tail gas, comprises the steps:
First chlorohydrin action removes hydrogen chloride and residual chlorine through caustic wash tower containing sour tail gas, cool through recycle gas cooler again, liquid phase component is removed in gas-liquid separator, its gaseous component enters the second chlorohydrination tower after mixing with chlorine and industry water after entering recycle gas blower boosting and reacts, the unreacted chlorine of second chlorohydrination column overhead and hydrogen chloride enter scrubbing tower, by fixed gas emptying after spray industry water washing absorption.
In technique scheme, first chlorohydrin action removes hydrogen chloride and residual chlorine through caustic wash tower containing sour tail gas, and in this tower, alkali lye is excessive, circulating pump is set at the bottom of tower and alkali lye is not stopped circulation, circulating-pump outlet arranges pH and detects, and when testing pump outlet liquid pH numerical value is 7-8, supplements alkali lye.
In technique scheme, this caustic wash tower material selection FRP or carbon steel.
In technique scheme, chlorohydrin action removes after hydrogen chloride and residual chlorine containing sour tail gas through caustic wash tower, and tail gas is propylene, nitrogen and steam, not containing corrosive gas.
In technique scheme, the main tail gas containing propylene after removing hydrogen chloride and residual chlorine cools through recycle gas cooler, water vapor condensation is converted into water, goes out system through gas-liquid separator separates, and gas-liquid separator top gas phase part comprises the fixed gas such as propylene, nitrogen.
In technique scheme, described gaseous component enters recycle gas blower and boosts to 200kPag ~ 500kPag.
In technique scheme, chlorohydrin action removes after hydrogen chloride and residual chlorine containing sour tail gas through caustic wash tower, and tail gas is propylene, a small amount of nitrogen and steam, not containing corrosive gas.Therefore, the material of the equipment such as follow-up described recycle gas cooler, gas-liquid separator, recycle gas blower requires to lower, and can select carbon steel.
In technique scheme, chlorohydrin action removes after hydrogen chloride and residual chlorine containing sour tail gas through caustic wash tower, and tail gas is propylene, a small amount of nitrogen and steam, not containing corrosive gas.Therefore the quantity of toxic gas detector in follow-up flow process, can be reduced.
In technique scheme, the main tail gas containing propylene chlorine and industry water mixing after recycle gas blower boosting, enter the second chlorohydrination tower and carry out second level chlorohydrin action.For ensureing that high cost raw material propylene fully reacts, in described second chlorohydrination tower reaction, adopting accurate flowmeter to control chlorine flowrate, making excessive 1 ~ 5% (mol%) of chlorine.
In technique scheme, the unreacted chlorine of the second chlorohydrination column overhead and hydrogen chloride enter scrubbing tower, by emptying after spray industry water washing absorption.
In technique scheme, the waste water of described washing tower reactor recycles through circulating pump.
The advantage that the present invention is compared with the prior art had and good effect are:
1) reduce the material requirement of large equipment such as recycle gas cooler, recycle gas blower, reduce equipment investment cost, improve device economy.
2) there is flow process in what shorten toxic gas, reduces the quantity of toxic gas detector, reduces the possibility of toxic gas diffusion, improve production environment.
3), after first chlorohydrin action removes sour gas containing sour tail gas, reduce the harmful effect to propylene, improve the conversion ratio of propylene.
4) because the first step in vent gas treatment is just fallen the impurity treatment such as residual chlorine and hydrogen chloride, make in the process of subsequent absorption propylene, chlorine can precisely feed intake, and subsequent acidic gas disposal amount is significantly reduced, and avoids and impacts environmental protection.
5) utilize chlorohydrin action of the present invention containing sour exhaust gas treating method, simple process, equipment investment is few, and production environment is good, and the investment of device entirety is little.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
In Fig. 1,1 is caustic wash tower, and 2 is recycle gas cooler, and 3 is gas-liquid separator, and 4 is recycle gas blower, and 5 is the second chlorohydrination tower, and 6 is scrubbing tower.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention will be further described, but do not limit protection scope of the present invention.
Embodiment 1
In propylene oxide production process, chlorohydrin action is containing a processing method for sour tail gas, comprises the steps:
Chlorohydrin action is containing sour tail gas (hydrogen chloride 15mol%, residual chlorine 6mol%, nitrogen 20mol%, propylene 16mol%) first through caustic wash tower 1, caustic wash tower 1 material selection FRP, in this tower, alkali lye is excessive, circulating pump is set at the bottom of tower and alkali lye is not stopped circulation, circulating-pump outlet arranges pH and detects, and when testing pump outlet liquid pH numerical value is 7-8, supplements alkali lye; After removing hydrogen chloride and residual chlorine, main containing propylene, nitrogen (nitrogen 40mol% in tail gas, propylene 33mol%,), after cooling with gas-liquid separator 3 through recycle gas cooler 2, being separated, gaseous component (propylene 44mol%), enters recycle gas blower 4 and carries out boosting to 200kPag, then mix with chlorine and industry water, enter the second chlorohydrination tower 5 and react.Adopt accurate flowmeter to control chlorine flowrate, make excessive 1% (mol%) of chlorine, ensure propylene total overall reaction, the unreacted tail gas of tower top (hydrogen chloride 5mol%, residual chlorine 2mol%, nitrogen 80mol%) enter scrubbing tower 6, by emptying after spray industry water washing absorption.Scrubbing tower 6 tower reactor waste water recycles through circulating pump.Wherein, recycle gas cooler 2, gas-liquid separator 3, recycle gas blower 4 material all select carbon steel.
Embodiment 2
In propylene oxide production process, chlorohydrin action is containing a processing method for sour tail gas, comprises the steps:
Chlorohydrin action is containing sour tail gas (hydrogen chloride 15mol%, residual chlorine 6mol%, nitrogen 20mol%, propylene 16mol%) first through caustic wash tower 1, caustic wash tower 1 material selection carbon steel, in this tower, alkali lye is excessive, circulating pump is set at the bottom of tower and alkali lye is not stopped circulation, circulating-pump outlet arranges pH and detects, and when testing pump outlet liquid pH numerical value is 7-8, supplements alkali lye; After removing hydrogen chloride and residual chlorine, main containing propylene, nitrogen (nitrogen 40mol% in tail gas, propylene 33mol%), after cooling with gas-liquid separator 3 through recycle gas cooler 2, being separated, gaseous component (propylene 44mol%), enter recycle gas blower 4 to carry out boosting to 500kPag, then mix with chlorine and industry water, enter the second chlorohydrination tower 5 and react.Accurate flowmeter is adopted to control chlorine flowrate, make excessive 3% (mol%) of chlorine, ensure propylene total overall reaction, the unreacted tail gas of tower top (hydrogen chloride 4mol%, residual chlorine 1.4mol%, nitrogen 83mol%) enter scrubbing tower 6, by emptying after spray industry water washing absorption.Scrubbing tower 6 tower reactor waste water recycles through circulating pump.Wherein, recycle gas cooler 2, gas-liquid separator 3, recycle gas blower 4 material all select carbon steel.
Above the embodiment of the present invention has been described in detail, but described content is only preferred embodiment of the present invention, not in order to limit the present invention.All make in application range of the present invention any amendment, equivalent to replace and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. in a propylene oxide production process, chlorohydrin action contains the processing method of sour tail gas, it is characterized in that: comprise the steps: that chlorohydrin action contains sour tail gas and first removes hydrogen chloride and residual chlorine through caustic wash tower, cool through recycle gas cooler again, liquid phase component is removed in gas-liquid separator, its gaseous component enters the second chlorohydrination tower after mixing with chlorine and industry water after entering recycle gas blower boosting and reacts, the unreacted chlorine of second chlorohydrination column overhead and hydrogen chloride enter scrubbing tower, by fixed gas emptying after spray industry water washing absorption.
2. chlorohydrin action contains the processing method of sour tail gas according to claim 1, it is characterized in that: first chlorohydrin action removes hydrogen chloride and residual chlorine through caustic wash tower containing sour tail gas, in this tower, alkali lye is excessive, circulating pump is set at the bottom of tower and alkali lye is not stopped circulation, circulating-pump outlet arranges pH and detects, when testing pump outlet liquid pH numerical value is 7-8, supplement alkali lye.
3. chlorohydrin action, containing the processing method of sour tail gas, is characterized in that: this caustic wash tower material selection FRP or carbon steel according to claim 2.
4. according to any one of claim 1-3, chlorohydrin action, containing the processing method of sour tail gas, is characterized in that: described gaseous component enters recycle gas blower and boosts to 200kPag ~ 500kPag.
5. chlorohydrin action, containing the processing method of sour tail gas, is characterized in that: the material of the equipment such as described recycle gas cooler, gas-liquid separator, recycle gas blower is carbon steel according to claim 4.
6. according to any one of claim 1-5, chlorohydrin action, containing the processing method of sour tail gas, is characterized in that: in described second chlorohydrination tower reaction, adopt accurate flowmeter to control chlorine flowrate, make excessive 1 ~ 5% (mol%) of chlorine.
7. chlorohydrin action, containing the processing method of sour tail gas, is characterized in that: the waste water of described washing tower reactor recycles through circulating pump according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410816430.0A CN104607024A (en) | 2014-12-23 | 2014-12-23 | Treatment method of acid-containing tail gas of chlorohydrination reaction |
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| CN201410816430.0A CN104607024A (en) | 2014-12-23 | 2014-12-23 | Treatment method of acid-containing tail gas of chlorohydrination reaction |
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| CN104607024A true CN104607024A (en) | 2015-05-13 |
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| CN201410816430.0A Pending CN104607024A (en) | 2014-12-23 | 2014-12-23 | Treatment method of acid-containing tail gas of chlorohydrination reaction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109621685A (en) * | 2019-01-31 | 2019-04-16 | 滨化集团股份有限公司 | A kind of technique that deep cooling adds carbon fiber adsorption and catalytic combustion processing chlorohydrination tail gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4315903A (en) * | 1975-05-21 | 1982-02-16 | Union Oil Company Of California | Reducing the consumption of anthraquinone disulfonate in stretford solutions |
| CN201762268U (en) * | 2010-06-18 | 2011-03-16 | 淄博职业学院 | Chlorohydrination reaction control system |
| CN201785327U (en) * | 2010-07-02 | 2011-04-06 | 刘哲 | System for preparing epoxypropane by chlorhydrin method |
| CN201999876U (en) * | 2011-02-11 | 2011-10-05 | 福建湄洲湾氯碱工业有限公司 | Chlorohydrination reaction system |
-
2014
- 2014-12-23 CN CN201410816430.0A patent/CN104607024A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4315903A (en) * | 1975-05-21 | 1982-02-16 | Union Oil Company Of California | Reducing the consumption of anthraquinone disulfonate in stretford solutions |
| CN201762268U (en) * | 2010-06-18 | 2011-03-16 | 淄博职业学院 | Chlorohydrination reaction control system |
| CN201785327U (en) * | 2010-07-02 | 2011-04-06 | 刘哲 | System for preparing epoxypropane by chlorhydrin method |
| CN201999876U (en) * | 2011-02-11 | 2011-10-05 | 福建湄洲湾氯碱工业有限公司 | Chlorohydrination reaction system |
Non-Patent Citations (2)
| Title |
|---|
| 凌世明等: "碱洗系统改造，提高碱洗效果", 《天津科技》 * |
| 孙维华等: "环氧丙烷装置第二氯醇化系统的改造", 《河南化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109621685A (en) * | 2019-01-31 | 2019-04-16 | 滨化集团股份有限公司 | A kind of technique that deep cooling adds carbon fiber adsorption and catalytic combustion processing chlorohydrination tail gas |
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