CN103896882A - Method for preparing ethylene oxide by adopting chlorohydrin method - Google Patents
Method for preparing ethylene oxide by adopting chlorohydrin method Download PDFInfo
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- CN103896882A CN103896882A CN201210589346.0A CN201210589346A CN103896882A CN 103896882 A CN103896882 A CN 103896882A CN 201210589346 A CN201210589346 A CN 201210589346A CN 103896882 A CN103896882 A CN 103896882A
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- tower
- chloroethanol
- oxyethane
- hypochlorous acid
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/02—Synthesis of the oxirane ring
- C07D301/24—Synthesis of the oxirane ring by splitting off HAL—Y from compounds containing the radical HAL—C—C—OY
- C07D301/26—Y being hydrogen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Epoxy Compounds (AREA)
Abstract
The invention discloses a method for preparing ethylene oxide by adopting a chlorohydrin method. Ethylene and chlorine are steadfastly taken as raw materials. The main process is divided into two steps: 1, enabling chlorine to react with water to generate a hypochlorous acid, wherein the molar ratio of the chorine to the water is 1:(1-2), and the reaction molar ratio of the hypochlorous acid to the ethylene is 1:(0.5:1) to generate chlorethyl alcohol; and 2, saponifying the chlorethyl alcohol to generate the ethylene oxide. A tower reactor is adopted and used as a distillation tower; a chlorethyl alcohol solution and lime milk are simultaneously added to the tower. The light component ethylene oxide is distilled out from the tower top, and a calcium chloride water solution containing organic matters is discharged from the tower bottom.
Description
Technical field
The present invention adopts chlorohydrination to prepare oxyethane.This method technical process is simple, and reduced investment has become the main method of industrial production oxyethane.
Background technology
Adopt direct oxidation of ethylene to method also can produce oxyethane.Direct oxidation of ethylene to method is divided into again air oxidation process and dioxygen oxidation method.Because dioxygen oxidation method has the advantages such as ethylene oxide output is high, cost is low, plant investment is few, replace gradually air method and become the method for the industrial production oxyethane having comparative advantage.Oxidation style has different technologies because catalyzer and technique are different, but the oxyethane that adopts the device of shell, halcon-sd and UCC tri-company's technology to produce accounts for 85% of world's oxyethane output.
Direct oxidation of ethylene to method is produced oxyethane, no matter using air as oxygenant or purity oxygen as oxygenant, the technology of the different companys such as Shell, halcon-sd and UCC is similar.Mainly formed by following several parts.The mixing of the fresh oxygenant supplementing and ethene and circulation gas, ethene carry out oxidizing reaction generation oxyethane under catalyzer exists, absorbing foreign capital and desorb of oxyethane, the concentrate of oxyethane and rectifying, in circulation gas the absorption of carbonic acid gas with separate etc.
Summary of the invention
Problem to be solved by this invention is, overcomes the deficiencies in the prior art, and a kind of preparation method who adopts chlorohydrination to produce oxyethane is provided, it is characterized in that by ethene and chlorine be raw material, main technique is divided into two steps, and the first step is that chlorine and water are reacted into hypochlorous acid, and mol ratio is 1:1-2; Hypochlorous acid and ethylene reaction mol ratio are 1:0.5-1; Generate chloroethanol; Second step chloroethanol generates oxyethane through saponification; Chlorohydrination is produced the reactor of oxyethane various ways, resident office use for tower.Water and chlorine enter from the bottom of tower, generate hypochlorous acid; Ethene passes into aloft, reacts generate chloroethanol with hypochlorous acid, is overflowed the aqueous solution of chloroethanol by tower top.Temperature of reaction is 10 ~ 50 degree, normal pressure.In order to strengthen circulation, reactor can increase outside arm.In order to reduce side reaction, obtain only 4% ~ 6% chloroethanol solution of concentration, can directly carry out saponification (or cyclisation) reaction.Saponification process can be carried out in autoclave or tower reactor.Adopt milk of lime to make saponifying agent, temperature of reaction is 100 ~ 102 degree, and approximately 30 minutes residence time, sponifiable is complete.Adopt tower reactor, double as distillation tower use, chloroethanol solution and milk of lime add in tower simultaneously, steam light constituent oxyethane by tower top, and tower reactor discharge contains organic calcium chloride water.
Chlorohydrination is classical production ethylene oxide process.During the World War I, German BASF AG has set up the factory that produces oxyethane with chlorohydrination, obtains large development before nineteen fifties, becomes the main method of industrial production oxyethane.
Chlorohydrination is taking ethene and chlorine as raw material, and its main technique is divided into two steps, and the first step is that chlorine and water are reacted into hypochlorous acid, and hypochlorous acid and ethylene reaction generate chloroethanol; Second step chloroethanol generates oxyethane through saponification.Main chemical reactions formula is as follows:
CL?+H?O→HCLO+HCL
HCLO+C?H?→CH?CLCH?OH
2CH?CLCH?OH+Ca(OH)?→2C?H?O+CaCL?+2H?O
Side reaction has chlorine to react with Addition on ethylene to generate ethylene dichloride, and chloroethanol reacts with excessive ethene and chlorine and generates dichloro-diethyl ether etc.Therefore in the time generating hypochlorous acid, the existence of free chlorine has increased the probability of side reaction.
Chlorohydrination is produced the reactor of oxyethane various ways, resident office use for tower.Water and chlorine enter from the bottom of tower, generate hypochlorous acid; Ethene passes into aloft, reacts generate chloroethanol with hypochlorous acid, is overflowed the aqueous solution of chloroethanol by tower top.Temperature of reaction is 10 ~ 50 degree, normal pressure.In order to strengthen circulation, reactor can increase outside arm.In order to reduce side reaction, obtain only 4% ~ 6% chloroethanol solution of concentration, can directly carry out saponification (or cyclisation) reaction.Saponification process can be carried out in autoclave or tower reactor.Adopt milk of lime to make saponifying agent, temperature of reaction is 100 ~ 102 degree, and approximately 30 minutes residence time, sponifiable is complete.Adopt tower reactor, double as distillation tower use, chloroethanol solution and milk of lime add in tower simultaneously, steam light constituent oxyethane by tower top, and tower reactor discharge contains organic calcium chloride water.
Embodiment
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.Raw material wherein can have been bought in market.
Embodiment 1
Adopt chlorohydrination to produce a preparation method for oxyethane, it is characterized in that by ethene and chlorine be raw material, main technique is divided into two steps, and the first step is that chlorine and water are reacted into hypochlorous acid, and mol ratio is 1:1; Hypochlorous acid and ethylene reaction mol ratio are 1:0.5; Generate chloroethanol; Second step chloroethanol generates oxyethane through saponification; Chlorohydrination is produced the reactor of oxyethane various ways, resident office use for tower.Water and chlorine enter from the bottom of tower, generate hypochlorous acid; Ethene passes into aloft, reacts generate chloroethanol with hypochlorous acid, is overflowed the aqueous solution of chloroethanol by tower top.Temperature of reaction is 10 degree, normal pressure; Saponification process can be carried out in autoclave or tower reactor.Adopt milk of lime to make saponifying agent, temperature of reaction is 100 degree, and approximately 30 minutes residence time, sponifiable is complete; Adopt tower reactor, double as distillation tower use, chloroethanol solution and milk of lime add in tower simultaneously, steam light constituent oxyethane by tower top, and tower reactor discharge contains organic calcium chloride water.
Embodiment 2
Adopt chlorohydrination to produce a preparation method for oxyethane, it is characterized in that by ethene and chlorine be raw material, main technique is divided into two steps, and the first step is that chlorine and water are reacted into hypochlorous acid, and mol ratio is 1:2; Hypochlorous acid and ethylene reaction mol ratio are 1:1; Generate chloroethanol; Second step chloroethanol generates oxyethane through saponification; Chlorohydrination is produced the reactor of oxyethane various ways, resident office use for tower.Water and chlorine enter from the bottom of tower, generate hypochlorous acid; Ethene passes into aloft, reacts generate chloroethanol with hypochlorous acid, is overflowed the aqueous solution of chloroethanol by tower top.Temperature of reaction is 50 degree, normal pressure; Saponification process can be carried out in autoclave or tower reactor.Adopt milk of lime to make saponifying agent, temperature of reaction is 102 degree, and approximately 30 minutes residence time, sponifiable is complete; Adopt tower reactor, double as distillation tower use, chloroethanol solution and milk of lime add in tower simultaneously, steam light constituent oxyethane by tower top, and tower reactor discharge contains organic calcium chloride water.
Claims (1)
1. adopt chlorohydrination to produce a preparation method for oxyethane, it is characterized in that by ethene and chlorine be raw material, main technique is divided into two steps, and the first step is that chlorine and water are reacted into hypochlorous acid, and mol ratio is 1:1-2; Hypochlorous acid and ethylene reaction mol ratio are 1:0.5-1; Generate chloroethanol; Second step chloroethanol generates oxyethane through saponification; Chlorohydrination is produced the reactor of oxyethane various ways, resident office use for tower, water and chlorine enter from the bottom of tower, generate hypochlorous acid; Ethene passes into aloft, reacts generate chloroethanol with hypochlorous acid, is overflowed the aqueous solution of chloroethanol by tower top, and temperature of reaction is 10 ~ 50 degree, normal pressure; Saponification process can be carried out in autoclave or tower reactor, adopts milk of lime to make saponifying agent, and temperature of reaction is 100 ~ 102 degree, and approximately 30 minutes residence time, sponifiable is complete; Adopt tower reactor, double as distillation tower use, chloroethanol solution and milk of lime add in tower simultaneously, steam light constituent oxyethane by tower top, and tower reactor discharge contains organic calcium chloride water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210589346.0A CN103896882A (en) | 2012-12-31 | 2012-12-31 | Method for preparing ethylene oxide by adopting chlorohydrin method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210589346.0A CN103896882A (en) | 2012-12-31 | 2012-12-31 | Method for preparing ethylene oxide by adopting chlorohydrin method |
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| CN103896882A true CN103896882A (en) | 2014-07-02 |
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| CN201210589346.0A Pending CN103896882A (en) | 2012-12-31 | 2012-12-31 | Method for preparing ethylene oxide by adopting chlorohydrin method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106518614A (en) * | 2016-08-30 | 2017-03-22 | 江西苏克尔新材料有限公司 | Methods for preparing halogenated ethanol and ethylene oxide by dry gas |
| CN110734422A (en) * | 2019-10-30 | 2020-01-31 | 吴剑华 | Production method of propylene carbonate or ethylene carbonate |
| CN112500373A (en) * | 2019-09-14 | 2021-03-16 | 南京延长反应技术研究院有限公司 | Micro-interface strengthening system and process for preparing ethylene oxide from ethylene |
| CN113248460A (en) * | 2021-05-12 | 2021-08-13 | 河北工业大学 | Method and equipment for preparing ethylene oxide from high-concentration chloroethanol |
-
2012
- 2012-12-31 CN CN201210589346.0A patent/CN103896882A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106518614A (en) * | 2016-08-30 | 2017-03-22 | 江西苏克尔新材料有限公司 | Methods for preparing halogenated ethanol and ethylene oxide by dry gas |
| CN106518614B (en) * | 2016-08-30 | 2019-11-05 | 江西苏克尔新材料有限公司 | A kind of method that dry gas prepares halogen ethyl alcohol and ethylene oxide |
| CN112500373A (en) * | 2019-09-14 | 2021-03-16 | 南京延长反应技术研究院有限公司 | Micro-interface strengthening system and process for preparing ethylene oxide from ethylene |
| CN110734422A (en) * | 2019-10-30 | 2020-01-31 | 吴剑华 | Production method of propylene carbonate or ethylene carbonate |
| WO2021083022A1 (en) * | 2019-10-30 | 2021-05-06 | 吴剑华 | Method for producing propylene carbonate or ethylene carbonate |
| CN113248460A (en) * | 2021-05-12 | 2021-08-13 | 河北工业大学 | Method and equipment for preparing ethylene oxide from high-concentration chloroethanol |
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Application publication date: 20140702 |