CN1727318A - Method for producing C2-C3 dihydric alcohol - Google Patents
Method for producing C2-C3 dihydric alcohol Download PDFInfo
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- CN1727318A CN1727318A CN 200410075025 CN200410075025A CN1727318A CN 1727318 A CN1727318 A CN 1727318A CN 200410075025 CN200410075025 CN 200410075025 CN 200410075025 A CN200410075025 A CN 200410075025A CN 1727318 A CN1727318 A CN 1727318A
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Abstract
A process for preparing C2-C3 diol includes such steps as using the absorption liquid containing vinyl carbonate or allyl carbonate and ethanediol or propanediol to absorb the epoxy ethane (or propane) generated by oxidizing ethene (or propene) and CO2, catalytic esterifying reaction between epoxy ethene (or propane) and CO2 to generate vinyl (or allyl) carbonate, using part of vinyl (or allyl) carbonate as said absorption liquid, and catalytic hydrolyzing the rest to obtain high-purity ethandiol (or propanediol) and CO2.
Description
Technical field
The present invention relates to the preparation method of the dibasic alcohol of a kind of C2～C3, be specifically related to a kind of method of producing ethylene glycol or propylene glycol with the olefin oxidation product of C2～C3.
Background technology
At present, the dibasic alcohol of C2～C3 all is oxyethane or propane pressurized water symphysis production art as the production technique of ethylene glycol and propylene glycol.Main flow process is: second (third) alkene catalytic gas phase oxidation in the presence of silver catalyst obtains epoxy second (third) alkane and CO
2Obtain containing the gas of epoxy second (third) alkane 0.5-2.0%, carbonic acid gas 1.5-15%.The gas that contains epoxy second (third) alkane contacts with big water gaging, and epoxy second (third) alkane is absorbed in the water.Decompression heating recovery epoxy second (third) alkane.Water cycle is as absorption agent.
Refining back of epoxy second (third) alkane and the water ratio of being made into are 1: 6 solution, place tower reactor, at 150～200C, 1.5 the reaction direct liquid-phase hydration system second of 1h (third) glycol under the～2.5MPa condition, simultaneously, by-product diethyl (third) glycol, three second (the third) two pure and mild many second (third) glycol.When entering expander after reaction gained second (third) glycol dilute solution is cooled by heat exchanger, volatile components such as aldehyde are blown out, liquid flows into storage tank, carry dense with the pumping devaporation again, liquid after triple effect evaporation enters first distillation tower to carry out vacuum distilling and removes moisture, and the thick second of cat head (third) glycol enters second column, and cat head obtains pure second (third) glycol, second (third) glycol that obtains at the bottom of the tower contracting enters packing tower rectifying and draws various components again.
Pressure boost and elevated temperature can improve the productive rate of second (third) glycol in this law, but the amount of by product diethyl (third) glycol and superpolymer also increases, and promptly epoxy second (third) alkane changes into the selectivity variation of second (third) glycol.In order to improve the selectivity of second (third) glycol, can in raw material, suitably improve the proportional quantity of water, usually 1: between (15～20), but the content of second (third) glycol in water is only about 10% in the product, thereby has increased the consumption of energy when concentrated.
The main drawback of existing technology is
(1) hydration of epoxy second (third) alkane needs a large amount of excessive water, general 1: 15～1: 25;
(2) transformation efficiency is low, yield is low, and general 80%～90%;
(3) by product is many, by-product diethyl (third) glycol, three second (third) glycol, many second (third) glycol;
(4) energy consumption is big, sloughs big water gaging and must consume a large amount of heat energy;
(5) long flow path, institute's palpus equipment is huge.
Some patent has proposed certain methods, when keeping second (third) glycol highly selective, reduce the water yield that is used for epoxy second (third) alkane, wherein epoxy second (third) alkane of desorb and carbon dioxide reaction are to generate ethylene (third) alkene ester, then the hydrolysis highly selective generates second (third) glycol, in Japanese Patent 57-106631, propose, use the halo an alkali metal salt to make epoxy second (third) institute change into ethylene (third) alkene ester, hydrolysis Japanese Patent 3-23548 then, in the Chinese patent 96121781, propose in the presence of organic season of halo phosphine, to make epoxy second (third) alkane and carbon dioxide reaction change into ethylene (third) alkene ester; Among the Japanese Patent 4-27972, the hydrolysis under the effect of phosphine of organic season of halo of ethylene (third) alkene ester obtains second (third) glycol.
Adopt above method, in order to obtain high selectivity, do not need the water more than stoichiometric number is added to reactor, therefore, rectifying is removed a large amount of excessive water institute energy requirements and can be avoided.Yet owing to adopt homogeneous catalyst, second (third) glycol that hydrolysis generates must adopt the method and the catalyst separating of rectifying, and this energy consumption has increased the cost of second (third) glycol production greatly.
Will be in the aforesaid method with isolating epoxy second (third) alkane as initial substance, in order to overcome the energy consumption problem of the absorption desorption process of refining epoxy second (third) alkane from the gas that contains epoxy second (third) alkane, Chinese patent 96121781, U.S. Pat P5763691 propose with epoxy second (third) alkane in absorption liquid absorption second (third) the alkene oxidation gained gas that mainly contains ethylene (third) alkene ester, second (the third) two alcohol and water.Epoxy second (third) alkane in the presence of the carbonic acid esterifying catalyst in the absorbent solution in carbonation reactor with the carbon dioxide reaction that adds.Yet, the loss when this arts demand replenishes discharging with pure carbonic acid gas, thereby the CO of second (third) alkene oxidation by-product
2Can not fully utilize, and the remarkable pressure reduction between absorption, esterification and the hydrolyzing process makes CO
2The round-robin power consumption increases.
Summary of the invention
The technical issues that need to address of the present invention are the preparation methods that disclose the dibasic alcohol of a kind of C2～C3, to overcome the above-mentioned defective that prior art exists.
Technical conceive of the present invention is such:
(a) absorb oxyethane or propylene oxide and the carbonic acid gas that ethene or propylene oxidation produce simultaneously with the absorption liquid that contains NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol;
(b) oxyethane in the absorption liquid or propylene oxide and carbonic acid gas catalytic esterification generate the NSC 11801 or third ethylene (propylene) carbonate.
(c) ethylene (a third) alkene ester part circulates as absorption liquid, and the remainder catalytic hydrolysis obtains highly purified second (third) glycol, by-product pure carbon dioxide.
Specifically, method of the present invention comprises the steps:
(1) mixed gas that will contain oxyethane or propylene oxide and carbonic acid gas contacts with containing NSC 11801 or the propylene carbonate absorption liquid with ethylene glycol or propylene glycol, to absorb oxyethane or propylene oxide and the carbonic acid gas in the mixed gas simultaneously;
Absorption temperature is 5-80 ℃, and preferred 30-50 ℃, pressure is 0.5～5.0Mpa, and in the absorption liquid, the weight ratio of NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol is 0.1-10, and vapour-liquid ratio is 0.1～10, weight ratio;
(2) absorbent solution that contains oxyethane or propylene oxide and carbonic acid gas is in the presence of esterifying catalyst, and oxyethane or propylene oxide and carbonic acid gas catalytic esterification generate NSC 11801 or propylene carbonate;
Esterifying catalyst has homogeneous phase and heterogeneous two big classes.Many patents and document disclose described catalyzer, homogeneous catalyst is selected from halo alkaline-earth metal (USP2667497), alkylamine, quaternary ammonium salt (USP2773070), halogenated organic sulfonate or halogenated organic antimony (USP4400559), sulfohalide (USP4508972) bromination or iodate basic metal (Japanese Patent 38-23175), organotin, germanium, tellurium (Japanese Patent 57-183784), halogenated organic phosphine (Japanese Patent 58-126884, Chinese patent 96121781).Heterogeneous catalyst comprises anionite-exchange resin (Japanese Patent 3-120270), tungsten or molybdenum oxidation oxide compound and salt thereof (Japanese Patent 7-206847), molecular sieve.
Esterification is carried out adding to depress, and is generally 1.0-7.0MPa, and temperature is 100-200 ℃, and the reaction times is generally 10-120min.
(3) adopt conventional method to remove carbonic acid gas in the reaction solution after, reaction solution adopts conventional method, as distillation, collects the mixture of ethylene glycol or propylene glycol and NSC 11801 or propylene carbonate;
(4) reaction solution and the water that contains NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol is hydrolyzed, the consumption of water be NSC 11801 or propylene carbonate molar weight in the mixing solutions 1.0-3.0 doubly.Hydrolysis reaction is usually at normal pressure or add to depress and carry out, and pressure is 0.01-10.0MPa, and temperature of reaction is 100-250 ℃, reaction times is generally 1-3 hour, be preferably in the presence of hydrolyst and be hydrolyzed, can raise the efficiency greatly, can shorten during reaction in 10-100min.
Hydrolyst comprises homogeneous phase and heterogeneous catalyst two big classes.Homogeneous catalyst is selected from oxyhydroxide, the tertiary amine (USP5763691) of alkali or alkaline-earth metal, carbonate, tertiary phosphine etc.Heterogeneous catalyst comprises Al
2O
3(Japanese Patent 57-106631), molecular sieve etc.
(5) collect second (third) glycol the reaction solution after hydrolysis.
Method of the present invention can reduce greatly by the energy consumption of epoxy second (third) alkane through ethylene (third) alkene ester route production second (third) glycol technology.
The present invention has following characteristics: one, absorb epoxy second (third) alkane and carbonic acid gas in second (third) the alkene oxidizing gas simultaneously with the absorption liquid that contains ethylene (third) alkene ester and second (third) glycol; Two, epoxy second (third) alkane in the absorption liquid and carbonic acid gas generation esterification generate ethylene (third) alkene ester in the presence of the carbonic acid esterifying catalyst; Three, ethylene (a third) alkene ester part circulates as absorption liquid, remainder with the molecular sieve for the catalyzer hydrolysis obtains highly purified second (third) glycol, the carbonic acid gas that by-product is pure, second (third) glycol is by filtration, evaporation and catalyst separating.Four, absorption, esterification and hydrolyzing process all carry out adding to depress, and whole flow process pressure surge is less, and energy expenditure obviously reduces, and for the device of same production scale, energy consumption can reduce by 20%, has bigger industrializing implementation prospect.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
As seen from Figure 1, method of the present invention comprises the steps:
(1) gas that contains oxyethane or propylene oxide and carbonic acid gas and absorption liquid counter current contact in absorption tower 1 of ethene or PROPENE IN GAS PHASE OXIDATION reaction generation, oxyethane or propylene oxide and carbonic acid gas are absorbed in the absorption liquid that contains NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol, absorb tail gas and send to ethene or the recycle of propylene oxidation operation through pipeline;
The reaction of ethene or PROPENE IN GAS PHASE OXIDATION produces contain oxyethane or propylene oxide and carbonic acid gas be a kind of technology of routine, the gaseous oxidation under silver catalyst of ethene or propylene obtains containing the gas of oxyethane or propylene oxide 0.5-2.0%, carbonic acid gas 1.5-15%, also contains ethene or propylene, oxygen, water, second (third) alkane and aldehydes in this gas;
(2) absorbent solution that contains oxyethane or propylene oxide and carbonic acid gas enters carbonation reactor 2, in the presence of esterifying catalyst, oxyethane or propylene oxide and carbonic acid gas catalytic esterification generate NSC 11801 or propylene carbonate, esterifying catalyst is from NSC 11801 or propylene carbonate distillation tower 3 bottoms, reactor can adopt tank reactor or pipeline reactor, but exothermic heat of reaction in time should be removed, in order to avoid reactor temperature runaway.
(3) after esterification was finished, reaction solution entered gas-liquid separator 4 through pipeline, and pressure is 0.0-1.0MPa in separator 4, CO
2Reach oxygen, ethene or propylene, ethane or propane and aldehydes and resolved, the gas of separating is circulated to ethene or propylene oxidation operation through pipeline;
Remove the later reaction solution of carbonic acid gas and enter NSC 11801 or propylene carbonate distillation tower 3, cat head is the mixture of ethylene glycol or propylene glycol and NSC 11801 or propylene carbonate, part is circulated to absorption tower 1 as absorption liquid, part enters follow-up hydrolysis reactor 5, obtain being rich in the mixing solutions of esterifying catalyst at the bottom of the tower, return carbonation reactor 2;
The weight that enters the mixing solutions of follow-up hydrolysis reactor 5 is 1～5 times as the mixing solutions of absorption liquid;
(4) reaction solution that contains NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol enters hydrolysis reactor 5 by pipeline, is hydrolyzed in the presence of catalyzer, and the required water of hydrolysis is replenished by moisturizing pipeline 6;
Reaction solution after the hydrolysis enters gas-liquid separator 7, and gas can be used as CO
2Product, or partly be circulated to ethene or propylene oxidation operation as diluent gas, liquid phase enters ethylene glycol or the exquisite operation of propylene glycol;
Reaction soln after the hydrolysis at first enters dehydration tower 8, excessive water in the hydrolytic process is deviate from from cat head, be circulated to hydrolysis reactor 5, ethylene glycol sent into by the bottoms material or propylene glycol recovery tower 9 carries out rectifying separation, tower top temperature is 70～150 ℃, the top of tower discharging is highly purified ethylene glycol or propylene glycol, directly as product.The bottom is heavy constituent such as second (the third) the two pure and mild micro-glycol ether.For avoiding the heavy constituent accumulation, a liquid phase part is discharged through pipeline at the bottom of the tower, and all the other are circulated to absorption tower 1.
Contain oxyethane 1.5mol%, carbonic acid gas 7.5mol% in the gas that oxidation of ethylene obtains, temperature is 35 ℃, a 's 1.2 meters packing tower with the flow of 10kg/h by bed height, 35 ℃ the absorption liquid that contains NSC 11801 and ethylene glycol (90: 10 mass ratioes) with the flow of 15kg/h under overhead streams, contact with back flow of gas, working pressure is 1.6MPa, and oxyethane and carbonic acid gas are absorbed in the absorption liquid.Analysis revealed, the specific absorption of oxyethane are more than 99.5%, and the specific absorption of carbonic acid gas is more than 90%.
Above-mentioned absorption liquid is mixed in tank reactor with catalyzer tetraethyl-amine bromide, and be heated to 150 ℃, working pressure is 1.6MPa, reacts after 30 minutes, and the transformation efficiency of oxyethane is more than 99%, does not monitor the generation of heavy component.
Pressure is dropped to 0.1MPa, resolve the carbonic acid gas in the solution, the co 2 removal rate is more than 95% after testing.With the solution distillation, cat head obtains the mixing solutions of NSC 11801 and ethylene glycol.The tower still must be rich in the solution of catalyzer, returns reaction kettle of the esterification.
The mixing solutions of 30% quality and 350ml water (molar weights of 1.05 times of NSC 11801 in mixing solutions) and K
2CO
3Catalyzer is introduced in the reactor, and reaction pressure is a normal pressure, and temperature is a boiling temperature, and the residence time is 20min.By analysis, the transformation efficiency of NSC 11801 is 100%, does not detect heavy component, and the yield of ethylene glycol is 100%.
The carbonic acid gas that hydrolysis generates is by gas-liquid separator separates, liquid phase with the dehydration tower rectifying of 20 blocks of column plates from cat head except that anhydrating discharging simple distillation at the bottom of the tower, tower top temperature is 70～150 ℃, cat head obtains highly purified ethylene glycol, and analytical results shows that purity is more than 99.9%.The tower still obtains spissated K
2CO
3-ethylene glycol solution returns hydrolysis reactor and recycles.Steam consumption 2.5kg/kgEG, compared with prior art, energy consumption lowers more than 50%
Contain propylene oxide 1.5mol%, carbonic acid gas 7.5mol% in the gas that propylene oxidation obtains, temperature is 35 ℃, a 's 1.2 meters packing tower with the flow of 10kg/h by bed height, 35 ℃ the absorption liquid that contains propylene carbonate and propylene glycol (90: 10 mass ratioes) with the flow of 15kg/h under overhead streams, contact with back flow of gas, working pressure is 1.6MPa, and propylene oxide and carbonic acid gas are absorbed in the absorption liquid.Analysis revealed, the specific absorption of propylene oxide are more than 99.5%, and the specific absorption of carbonic acid gas is more than 90%.
Above-mentioned absorption liquid is mixed in tank reactor with catalyzer tetrapropyl amine bromide, and be heated to 150 ℃, working pressure is 1.6MPa, reacts after 30 minutes, and the transformation efficiency of propylene oxide is more than 99%, does not monitor the generation of heavy component.
Pressure is dropped to 0.1MPa, resolve the carbonic acid gas in the solution, the co 2 removal rate is more than 95% after testing.With the solution distillation, cat head obtains the mixing solutions of propylene carbonate and propylene glycol.The tower still must be rich in the solution of catalyzer, returns reaction kettle of the esterification.
The mixing solutions of 30% quality and 350ml water (molar weights of 1.05 times of propylene carbonates in mixing solutions) and K
2CO
3Catalyzer is introduced in the reactor, and reaction pressure is a normal pressure, and temperature is a boiling temperature, and the residence time is 20min.By analysis, the transformation efficiency of propylene carbonate is 100%, does not detect heavy component, and the yield of propylene glycol is 100%.
The carbonic acid gas that hydrolysis generates is by gas-liquid separator separates, and liquid phase is removed from cat head with the dehydration tower rectifying of 20 blocks of column plates and anhydrated, discharging simple distillation at the bottom of the tower, and cat head obtains highly purified propylene glycol, the analytical results demonstration, purity is more than 99.9%.The tower still obtains spissated K
2CO
3-propylene glycol solution returns hydrolysis reactor and recycles.Steam consumption 2.5kg/kgPG compared with prior art, energy consumption lowers more than 50%
Above system is through long-play, quality product and stable yield.
Claims (9)
1. the preparation method of the dibasic alcohol of a C2～C3 is characterized in that, comprises the steps:
(1) mixed gas that will contain oxyethane or propylene oxide and carbonic acid gas contacts in absorption tower (1) with the absorption liquid that contains NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol, to absorb oxyethane or propylene oxide and the carbonic acid gas in the mixed gas simultaneously;
(2) absorbent solution that contains oxyethane or propylene oxide and carbonic acid gas is in the presence of esterifying catalyst, and oxyethane or propylene oxide and carbonic acid gas catalytic esterification generate NSC 11801 or propylene carbonate in carbonation reactor (2);
(3) adopt conventional method to remove carbonic acid gas in the reaction solution after, reaction solution adopts conventional method, collects the mixture of ethylene glycol or propylene glycol and NSC 11801 or propylene carbonate;
(4) reaction solution and the water that contains NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol is hydrolyzed in hydrolysis reactor (5);
(5) collect ethylene glycol or propylene glycol the reaction solution after hydrolysis.
2. method according to claim 1 is characterized in that, absorption temperature is 5-80 ℃, preferred 30-50 ℃, pressure is 0.01～10Mpa, in the absorption liquid, the weight ratio of NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol is 0.1-10, and vapour-liquid ratio is 1.0～3.0, weight ratio.
3. method according to claim 1 is characterized in that, absorption temperature is 30-50 ℃.
4. method according to claim 1, it is characterized in that esterifying catalyst is selected from a kind of in halo alkaline-earth metal, alkylamine, quaternary ammonium salt, halogenated organic sulfonate or halogenated organic antimony, sulfohalide, bromination or iodate basic metal, organotin, germanium, tellurium, halogenated organic phosphine, anionite-exchange resin, tungsten or molybdenum oxidation oxide compound and salt or the molecular sieve.
5. method according to claim 1 is characterized in that, esterification is carried out adding to depress, and is generally 1.0-7.0MPa, and temperature is 100-200 ℃, and the reaction times is generally 10-120min.
6. method according to claim 1, it is characterized in that, the consumption of water be NSC 11801 or propylene carbonate molar weight in the mixing solutions 1.0-3.0 doubly, hydrolysis pressure is 0.01-10.0MPa, temperature of reaction is 100-250 ℃, and the reaction times is 1～3 hour.
7. method according to claim 1, it is characterized in that, the reaction solution and the water that contain NSC 11801 or propylene carbonate and ethylene glycol or propylene glycol are being hydrolyzed in hydrolysis reactor (5) in the presence of the hydrolyst, and hydrolyst is selected from oxyhydroxide, tertiary amine, carbonate, tertiary phosphine, the Al of alkali or alkaline-earth metal
2O
3Or a kind of in the molecular sieve, reaction times is 10-100min, the consumption of water be NSC 11801 or propylene carbonate molar weight in the mixing solutions 1.0-3.0 doubly, hydrolysis pressure is 0.01-10.0MPa, temperature of reaction is 100-250 ℃, and the reaction times is 1～3 hour.
8. method according to claim 1, it is characterized in that, the ethylene glycol that step (3) is collected or the mixture of propylene glycol and NSC 11801 or propylene carbonate, part is circulated to absorption tower (1) as absorption liquid, part enters follow-up hydrolysis reactor (5), obtain being rich in the mixing solutions of esterifying catalyst at the bottom of the tower, return carbonation reactor (2);
The weight that enters the mixing solutions of follow-up hydrolysis reactor (5) is 1～5 times as the mixing solutions of absorption liquid.
9. method according to claim 1, it is characterized in that, reaction soln after the hydrolysis at first enters dehydration tower (8), excessive water in the hydrolytic process is deviate from from cat head, be circulated to hydrolysis reactor (5), ethylene glycol sent into by the bottoms material or propylene glycol recovery tower (9) carries out rectifying separation, and tower top temperature is 70～150 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491876A (en) * | 2011-11-11 | 2012-06-13 | 中国科学院过程工程研究所 | Method for preparing vicinal diol by solid base catalyst |
| CN102603477A (en) * | 2012-02-29 | 2012-07-25 | 南京工业大学 | Method for preparing ethylene glycol by ethylene carbonate method |
| RU2477718C2 (en) * | 2007-11-14 | 2013-03-20 | Шелл Интернэшнл Рисерч Маатсхаппий Б.В. | Method of producing alkylene glycol |
| CN108467383A (en) * | 2018-06-04 | 2018-08-31 | 吕庆霖 | A kind of method of ethylene oxide device coproduction ethylene carbonate |
| CN109678653A (en) * | 2017-10-19 | 2019-04-26 | 中国石油化工股份有限公司 | Technique for alkylene carbonates offal treatment |
| CN110831916A (en) * | 2017-05-25 | 2020-02-21 | 斯克利普斯研究所 | Direct oxidation of olefins to oxygenates |
| CN111072452A (en) * | 2019-12-30 | 2020-04-28 | 江苏奥克化学有限公司 | Method for preparing ethylene glycol |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4117250A (en) * | 1977-12-22 | 1978-09-26 | Union Carbide Corporation | Continuous process for producing alkylene glycols from alkylene carbonates |
| JP3659109B2 (en) * | 2000-01-19 | 2005-06-15 | 三菱化学株式会社 | Co-production method of ethylene glycol and carbonate |
| CN1309112A (en) * | 2000-02-17 | 2001-08-22 | 三菱化学株式会社 | Method for preparing alkylene diol |
-
2004
- 2004-08-30 CN CNB2004100750254A patent/CN100354244C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2477718C2 (en) * | 2007-11-14 | 2013-03-20 | Шелл Интернэшнл Рисерч Маатсхаппий Б.В. | Method of producing alkylene glycol |
| CN102491876A (en) * | 2011-11-11 | 2012-06-13 | 中国科学院过程工程研究所 | Method for preparing vicinal diol by solid base catalyst |
| CN102603477A (en) * | 2012-02-29 | 2012-07-25 | 南京工业大学 | Method for preparing ethylene glycol by ethylene carbonate method |
| CN110831916A (en) * | 2017-05-25 | 2020-02-21 | 斯克利普斯研究所 | Direct oxidation of olefins to oxygenates |
| CN109678653A (en) * | 2017-10-19 | 2019-04-26 | 中国石油化工股份有限公司 | Technique for alkylene carbonates offal treatment |
| CN108467383A (en) * | 2018-06-04 | 2018-08-31 | 吕庆霖 | A kind of method of ethylene oxide device coproduction ethylene carbonate |
| CN111072452A (en) * | 2019-12-30 | 2020-04-28 | 江苏奥克化学有限公司 | Method for preparing ethylene glycol |
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Assignee: Tongling Jintai Chemical Industrial Co., Ltd. Assignor: East China University of Science and Technology|Shanghai Huiyuan Industrial Co. Ltd. Contract record no.: 2009340000024 Date of cancellation: 20150730 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071212 Termination date: 20190830 |