CN103553877A - Method for rectifying ethylene glycol during production of ethylene glycol from calcium carbide furnace gas - Google Patents
Method for rectifying ethylene glycol during production of ethylene glycol from calcium carbide furnace gas Download PDFInfo
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Abstract
The invention relates to a method for rectifying ethylene glycol during production of the ethylene glycol from calcium carbide furnace gas. A methanol recovery tower, a dehydration tower, a dealcoholization tower, an ethylene glycol refining tower and an ethylene glycol product recovery tower, which are sequentially connected are adopted. According to different impurities in a crude product in different periods, a key purification device of the ethylene glycol, namely a product tower adopts a sub-tower disk for feeding and a sub-tower disk side mining technology so as to improve the purity of an ethylene glycol product; in order to solve the problems of complex impurities in the crude ethylene glycol, easiness in formation of an azeotrope and influence on ultraviolet light transmittance, a method for reasonably replenishing the fine ethylene glycol is adopted for the main dealcoholization tower and the dehydration tower so as to purify the quality of the ethylene glycol. According to the method, the difficult problems of poor quality, small market share, incapability of implementing industrialization amplification and the like of the ethylene glycol product which is produced from coal in China are effectively solved, and the method has the advantages of high impurity removal rate, high product quality, economy, reasonableness, feasible process technology, safety and stability, and can achieve the purposes of reducing the impurities in the product and improving the product quality. The method provided by the invention can be applied to the method for rectifying the ethylene glycol during the production of the ethylene glycol from the calcium carbide furnace gas.
Description
Technical field
The present invention relates to ethylene glycol distillation technology, be specially adapted in the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol.
Background technology
Ethylene glycol (EG) is one of important source material of organic chemistry industry, mainly for the production of vibrin and deicing fluid, in fields such as unsaturated polyester resin, lubricant, softening agent, nonionogenic tensides, also has a small amount of application.
China is maximum in the world ethylene glycol country of consumption, and consumption accounts for 1/3 of the world.Within 2012, China's ethylene glycol demand reaches 1,050 ten thousand tons, and output reaches 3,500,000 tons, and import interdependency reaches more than 70%.Rapidly, 90% ethylene glycol is for the production of vibrin for China's polyester industrial development, and 10% for the production of deicing fluid, tackiness agent, paint solvent etc., produces vibrin and requires ethylene glycol quality product to reach polyester grade requirement.
At present the production method of ethylene glycol mainly contains petroleum path and the large class of Non oil-based route two in the world, and petroleum path technical maturity apply comparatively extensively, but that the method is subject to International Petroleum Price to affect fluctuation is larger, and water compares greatly, and energy consumption is high, and production cost is higher.According to the resource situation of China's " oil-poor, rich coal, weak breath ", the coal-ethylene glycol technology of Non oil-based route is research and development direction from now on.
Since 2011, China's coal-ethylene glycol starts upsurge, but up to the present, coal-ethylene glycol technology is also immature, imperfect, one of problem existing is quality product existing problems, ethylene glycol quality product can only reach technical grade product, can not reach polyester grade requirement, polyester grade ethylene glycol requires more than 99.9% to product purity.Because hydrogenation reaction is a complicated chemosynthesis process, along with the increase in work-ing life of catalyzer, side reaction also increases thereupon, and dopant species and content increase, make comparatively difficulty of rectifying separation, this is also that current domestic coal-ethylene glycol product can not reach the major cause that polyester grade requires.And ethylene glycol distillation system plays key effect to end product quality.Impurity in ethylene glycol crude product is methyl alcohol, ethanol, methyl glycolate, dimethyl oxalate, 1,2-butyleneglycol etc., the increase of above impurity has brought the difficulty purifying to ethylene glycol distillation system, because ethylene glycol crude liquid boiling point is high, need in vacuum operating and feed liquid impurity easily and ethylene glycol formation azeotrope, the elevation of boiling point, is more difficult to conventional rectification simultaneously.Therefore research and develop the ethylene glycol distillation technology of the feasible calcium carbide furnace gas preparing ethylene glycol of economical rationality, Technology, extremely urgent.
Coal Chemical Industry " 12 " planning proposes, and by 2015, substantially grasps 200,000～300,000 tons of extensive complete set technologys of coal-ethylene glycol, possesses Project design construction and critical equipment manufacturing capacity.If can not realize the ethylene glycol product that synthetic gas method production polyester grade requires, to cause the rich coal of China can not carry out deep processing, can not produce and meet the polyester grade ethylene glycol product that downstream requires, have a strong impact on the energy general layout of China, to the interdependency of oil, can further deepen.
Summary of the invention
The invention reside in and solved that current China coal-ethylene glycol product foreign matter content is high, of poor quality, share of market is low, can not industrialization amplification etc. a difficult problem, by designing and optimize the rectifying workshop section of ethylene glycol, so provide that a kind of removal of impurity is high, quality product is high, the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol that economical rationality, Technology are feasible.
The technical solution used in the present invention is: the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol of the present invention, comprises the methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and the ethylene glycol product recovery tower that are connected successively, Methanol Recovery column overhead arranges one-level water cooler, secondary coolers, deep freezer, methanol distillation column return tank, vacuum system, dehydration column overhead arranges one-level water cooler, secondary coolers, deep freezer, dehydration tower return tank, vacuum system, dealcoholize column tower top arranges one-level water cooler, deep freezer, dealcoholize column return tank, vacuum system, purifying ethylene glycol column overhead arranges one-level water cooler, deep freezer, purifying ethylene glycol tower return tank, vacuum system, ethylene glycol product recovery tower tower top arranges one-level water cooler, deep freezer, ethylene glycol product recovery tower return tank, vacuum system.Adopt five tower rectification process flow processs, the main purpose of methanol distillation column is the methyl alcohol reclaiming in the thick alcohol product of hydrogenation, and reclaim product front-end volatiles (comprise dme, methyl-formiate etc.), the main purpose of dehydration tower is moisture and the part lower boiling alcohols of removing in product, ester class is (as C2-C5 alcohols, methyl glycolate, dimethyl oxalate), the main purpose of dealcoholize column is to remove glycols (as 2, 3-butyleneglycol, 1, 2-propylene glycol, 1, 2-butyleneglycol), purifying ethylene glycol tower main purpose is to obtain high-quality ethylene glycol product, the main purpose of glycol recovery tower is to propose last running, the ethylene glycol of discharging at the bottom of recovery purifying ethylene glycol tower tower.
In described calcium carbide furnace gas preparing ethylene glycol, the method for ethylene glycol rectifying, comprises the steps:
1. the thick ethylene glycol coming from hydrogenation unit is after preheater and the heat exchange of ethylene glycol product, enter methanol distillation column bottom, methanol distillation column overhead gas is partial condensation in one-level water cooler, uncooled gas enters secondary condenser condensation, still uncooled gas enters deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and secondary condenser enters methanol distillation column return tank through being pumped into methanol distillation column trim the top of column, the phlegma of deep freezer enters front-end volatiles storage tank, methanol distillation column top survey line extraction refined methanol;
2. Methanol Recovery tower reactor liquid arrives dehydration tower middle part through pump delivery, the condensation in first-stage condenser of dehydration column overhead gas, uncooled gas enters condensation in secondary condenser, still uncooled gas enters deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser enters dehydration tower return tank and refluxes through being pumped into dehydration column overhead, and the phlegma of secondary condenser and deep freezer is potato spirit byproduct, enters potato spirit storage tank;
3. dehydrating tower kettle liquid is transported to dealcoholize column middle part, the condensation in first-stage condenser of dealcoholize column overhead gas, uncondensed gas is sent into condensation in deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and deep freezer enters dealcoholize column return tank, phlegma is delivered to dealcoholize column trim the top of column through reflux pump, and partial condensation liquid is delivered to lighting end surge tank and stored;
4. dealcoholysis tower bottoms arrives purifying ethylene glycol tower bottom through pump delivery, the condensation in first-stage condenser of purifying ethylene glycol column overhead gas, uncondensed gas is sent into condensation in deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and deep freezer enters purifying ethylene glycol tower return tank, a phlegma part refluxes through being pumped into purifying ethylene glycol column overhead, and 98% 1 glycol storage tank is delivered in another part extraction;
5. purifying ethylene glycol tower top side line extraction premium grads ethylene glycol product, ethylene glycol product after preheater and thick ethylene glycol heat exchange cooling again through the laggard ethylene glycol product storage tank of condenser condenses;
6. purifying ethylene glycol tower bottoms arrives glycol recovery tower middle part through pump delivery, the condensation in first-stage condenser of glycol recovery column overhead gas, uncooled gas enters deep freezer condensation, non-condensable gas goes vacuum system, a phlegma part is through being pumped into trim the top of column, another part is delivered to 98% ethylene glycol storage tank as 98% ethylene glycol product extraction after cooling, and glycol recovery tower bottoms is delivered to heavy constituent storage tank.
The method of ethylene glycol rectifying in described calcium carbide furnace gas preparing ethylene glycol all arranges reboiler at the bottom of methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and ethylene glycol product recovery tower tower, and reboiler heat is provided by 1.0 ~ 2.0MPa steam.
The method of ethylene glycol rectifying in described calcium carbide furnace gas preparing ethylene glycol, deep freezer adopts liquefied ammonia as cooling medium.
The method of ethylene glycol rectifying in described calcium carbide furnace gas preparing ethylene glycol, vacuum system is comprised of vacuum buffer tank and vacuum pump.
The method of ethylene glycol rectifying in described calcium carbide furnace gas preparing ethylene glycol, after processing, ethylene glycol ultraviolet transmittance is: 220nm >=85%, 275 nm >=94%, 350 nm >=99.5%.
The method of ethylene glycol rectifying in described calcium carbide furnace gas preparing ethylene glycol, ethylene glycol product purity >=99.98% after processing.
According to the difference of the impurity in different times crude product, the crucial equipment for purifying treating tower of ethylene glycol adopts minute tower tray charging and a minute tower tray side to adopt technology, improves ethylene glycol product purity.Because foreign matter content in the synthetic thick ethylene glycol of hydrogenation catalyst is complicated, and along with the prolongation in reaction times, side reaction meeting constantly increases, originally the feed entrance point of tower has departed from original design value, increased the technology of segmentation partial volume charging for this reason, adjust and change the loading tray number of plies and three sections of fractional flow chargings, and the filler quantity of every section in tower is increased, adopt computer software to calculate and simulated the rectifying of ethylene glycol simultaneously, optimized the position of discharging column plate, selected applicable discharging position, in actual production, can load and the adjustment of discharging position according to actual motion,
In order to solve impurity complexity in thick ethylene glycol, easily form azeotrope, affect the problem of ultraviolet transmittance; Learn that from the above analysis foreign matter content is complicated, kind is many, adopts main dealcoholize column and dehydration tower are adopted to the quality of rationally mending the Methods For Purification ethylene glycol of smart ethylene glycol, and final expection makes product purity reach 99.9% above level.
Beneficial effect of the present invention: the present invention is according to the difference of the impurity in different times crude product, and the crucial equipment for purifying product of ethylene glycol tower adopts minute tower tray charging and a minute tower tray side to adopt technology, improves ethylene glycol product purity; In order to solve impurity complexity in thick ethylene glycol, easily form azeotrope, affect the problem of ultraviolet transmittance, main dealcoholize column and dehydration tower are adopted to the quality of rationally mending the Methods For Purification ethylene glycol of smart ethylene glycol, finally can make product purity reach 99.9% above level.The present invention effectively solves China's coal-ethylene glycol poor product quality, share of market is low, can not industrialization amplification etc. a difficult problem, have advantages of that removal of impurity is high, quality product is high, economical rationality, Technology are feasible, safety and stability, can reach the object that reduces impurity in product, improves the quality of products.The present invention can be widely used in ethylene glycol distillation technology, is specially adapted in the ethylene glycol rectificating method of calcium carbide furnace gas preparing ethylene glycol.
Accompanying drawing explanation:
Fig. 1 is process flow sheet of the present invention.
In Fig. 1: 1 is that methyl alcohol cooling tower, 2 is that preheater, 3 is that methanol distillation column, 4 is that reboiler, 5 is that methanol distillation column return tank, 6 is that dehydration tower, 7 is that dehydration tower return tank, 8 is that dealcoholize column, 9 is that purifying ethylene glycol tower, 10 is that ethylene glycol product recovery tower, 11 is that glycol recovery tower return tank, 12 is that one-level water cooler, 13 is that deep freezer, 14 is that vacuum buffer tank, 15 is that vacuum pump, 16 is that purifying ethylene glycol tower return tank, 17 is that dealcoholize column return tank, 18 is secondary coolers.
Embodiment:
With reference to accompanying drawing 1, the present embodiment comprises methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and the ethylene glycol product recovery tower being connected successively, Methanol Recovery column overhead arranges one-level water cooler, secondary coolers, deep freezer, methanol distillation column return tank, vacuum system, dehydration column overhead arranges one-level water cooler, secondary coolers, deep freezer, dehydration tower return tank, vacuum system, dealcoholize column tower top arranges one-level water cooler, deep freezer, dealcoholize column return tank, vacuum system, purifying ethylene glycol column overhead arranges one-level water cooler, deep freezer, purifying ethylene glycol tower return tank, vacuum system, ethylene glycol product recovery tower tower top arranges one-level water cooler, deep freezer, ethylene glycol product recovery tower return tank, vacuum system.
Another embodiment difference is to comprise the steps:
1. the thick ethylene glycol coming from hydrogenation unit is after preheater and the heat exchange of ethylene glycol product, enter methanol distillation column bottom, methanol distillation column overhead gas is partial condensation in one-level water cooler, uncooled gas enters secondary condenser condensation, still uncooled gas enters deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and secondary condenser enters methanol distillation column return tank through being pumped into methanol distillation column trim the top of column, the phlegma of deep freezer enters front-end volatiles storage tank, methanol distillation column top survey line extraction refined methanol;
2. Methanol Recovery tower reactor liquid arrives dehydration tower middle part through pump delivery, the condensation in first-stage condenser of dehydration column overhead gas, uncooled gas enters condensation in secondary condenser, still uncooled gas enters deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser enters dehydration tower return tank and refluxes through being pumped into dehydration column overhead, and the phlegma of secondary condenser and deep freezer is potato spirit byproduct, enters potato spirit storage tank;
3. dehydrating tower kettle liquid is transported to dealcoholize column middle part, the condensation in first-stage condenser of dealcoholize column overhead gas, uncondensed gas is sent into condensation in deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and deep freezer enters dealcoholize column return tank, phlegma is delivered to dealcoholize column trim the top of column through reflux pump, and partial condensation liquid is delivered to lighting end surge tank and stored;
4. dealcoholysis tower bottoms arrives purifying ethylene glycol tower bottom through pump delivery, the condensation in first-stage condenser of purifying ethylene glycol column overhead gas, uncondensed gas is sent into condensation in deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and deep freezer enters purifying ethylene glycol tower return tank, a phlegma part refluxes through being pumped into purifying ethylene glycol column overhead, and 98% 1 glycol storage tank is delivered in another part extraction;
5. purifying ethylene glycol tower top side line extraction premium grads ethylene glycol product, ethylene glycol product after preheater and thick ethylene glycol heat exchange cooling again through the laggard ethylene glycol product storage tank of condenser condenses;
6. purifying ethylene glycol tower bottoms arrives glycol recovery tower middle part through pump delivery, the condensation in first-stage condenser of glycol recovery column overhead gas, uncooled gas enters deep freezer condensation, non-condensable gas goes vacuum system, a phlegma part is through being pumped into trim the top of column, another part is delivered to 98% ethylene glycol storage tank as 98% ethylene glycol product extraction after cooling, and glycol recovery tower bottoms is delivered to heavy constituent storage tank.
Another embodiment difference is, at the bottom of methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and ethylene glycol product recovery tower tower, reboiler is all set, and reboiler heat is provided by 1.0MPa steam.
Another embodiment difference is, at the bottom of methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and ethylene glycol product recovery tower tower, reboiler is all set, and reboiler heat is provided by 1.5MPa steam.
Another embodiment difference is, at the bottom of methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and ethylene glycol product recovery tower tower, reboiler is all set, and reboiler heat is provided by 2.0MPa steam.
Another embodiment difference is that deep freezer adopts liquefied ammonia as cooling medium.
Another embodiment difference is that vacuum system is comprised of vacuum buffer tank and vacuum pump.
Another embodiment difference is to process rear ethylene glycol ultraviolet transmittance: 220nm 85%, 275 nm 94%, 350 nm 99.5%.
Another embodiment difference is to process rear ethylene glycol ultraviolet transmittance: 220nm 89%, 275 nm 97%, 350 nm 99.6%.
It is 99.98% that another embodiment difference is to process rear ethylene glycol product purity.
It is 99.99% that another embodiment difference is to process rear ethylene glycol product purity.
Claims (7)
1. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol, is characterized in that comprising the methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and the ethylene glycol product recovery tower that are connected successively, Methanol Recovery column overhead arranges one-level water cooler, secondary coolers, deep freezer, methanol distillation column return tank, vacuum system, dehydration column overhead arranges one-level water cooler, secondary coolers, deep freezer, dehydration tower return tank, vacuum system, dealcoholize column tower top arranges one-level water cooler, deep freezer, dealcoholize column return tank, vacuum system, purifying ethylene glycol column overhead arranges one-level water cooler, deep freezer, purifying ethylene glycol tower return tank, vacuum system, ethylene glycol product recovery tower tower top arranges one-level water cooler, deep freezer, ethylene glycol product recovery tower return tank, vacuum system.
2. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol according to claim 1, is characterized in that comprising the steps:
1. the thick ethylene glycol coming from hydrogenation unit is after preheater and the heat exchange of ethylene glycol product, enter methanol distillation column bottom, methanol distillation column overhead gas is partial condensation in one-level water cooler, uncooled gas enters secondary condenser condensation, still uncooled gas enters deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and secondary condenser enters methanol distillation column return tank through being pumped into methanol distillation column trim the top of column, the phlegma of deep freezer enters front-end volatiles storage tank, methanol distillation column top survey line extraction refined methanol;
2. Methanol Recovery tower reactor liquid arrives dehydration tower middle part through pump delivery, the condensation in first-stage condenser of dehydration column overhead gas, uncooled gas enters condensation in secondary condenser, still uncooled gas enters deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser enters dehydration tower return tank and refluxes through being pumped into dehydration column overhead, and the phlegma of secondary condenser and deep freezer is potato spirit byproduct, enters potato spirit storage tank;
3. dehydrating tower kettle liquid is transported to dealcoholize column middle part, the condensation in first-stage condenser of dealcoholize column overhead gas, uncondensed gas is sent into condensation in deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and deep freezer enters dealcoholize column return tank, phlegma is delivered to dealcoholize column trim the top of column through reflux pump, and partial condensation liquid is delivered to lighting end surge tank and stored;
4. dealcoholysis tower bottoms arrives purifying ethylene glycol tower bottom through pump delivery, the condensation in first-stage condenser of purifying ethylene glycol column overhead gas, uncondensed gas is sent into condensation in deep freezer, non-condensable gas goes vacuum system, the phlegma of first-stage condenser and deep freezer enters purifying ethylene glycol tower return tank, a phlegma part refluxes through being pumped into purifying ethylene glycol column overhead, and 98% 1 glycol storage tank is delivered in another part extraction;
5. purifying ethylene glycol tower top side line extraction premium grads ethylene glycol product, ethylene glycol product after preheater and thick ethylene glycol heat exchange cooling again through the laggard ethylene glycol product storage tank of condenser condenses;
6. purifying ethylene glycol tower bottoms arrives glycol recovery tower middle part through pump delivery, the condensation in first-stage condenser of glycol recovery column overhead gas, uncooled gas enters deep freezer condensation, non-condensable gas goes vacuum system, a phlegma part is through being pumped into trim the top of column, another part is delivered to 98% ethylene glycol storage tank as 98% ethylene glycol product extraction after cooling, and glycol recovery tower bottoms is delivered to heavy constituent storage tank.
3. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol according to claim 1 and 2, it is characterized in that: at the bottom of methanol distillation column, dehydration tower, dealcoholize column, purifying ethylene glycol tower and ethylene glycol product recovery tower tower, reboiler is all set, reboiler heat is provided by 1.0 ~ 2.0MPa steam.
4. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol according to claim 3, is characterized in that: deep freezer adopts liquefied ammonia as cooling medium.
5. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol according to claim 4, is characterized in that: vacuum system is comprised of vacuum buffer tank and vacuum pump.
6. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol according to claim 5, is characterized in that processing rear ethylene glycol ultraviolet transmittance and is: 220nm >=85%, 275 nm >=94%, 350 nm >=99.5%.
7. the method for ethylene glycol rectifying in calcium carbide furnace gas preparing ethylene glycol according to claim 6, is characterized in that processing rear ethylene glycol product purity >=99.98%.
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| CN104725191A (en) * | 2015-03-24 | 2015-06-24 | 中国五环工程有限公司 | Ethylene glycol refining and separating method and system |
| CN106608814A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | Method for improving quality of glycol product made from synthetic gas |
| CN106946654A (en) * | 2017-03-29 | 2017-07-14 | 东华工程科技股份有限公司 | A kind of separation method of biomass ethylene glycol |
| CN108329193A (en) * | 2018-04-03 | 2018-07-27 | 烟台国邦化工机械科技有限公司 | One kind being used for coal-ethylene glycol industry ethylene glycol recovery process method and system |
| CN109678666A (en) * | 2019-02-22 | 2019-04-26 | 乐陵聚久环保科技有限公司 | A kind of recovery method of synthesis gas preparing ethylene glycol waste liquid |
| CN109939456A (en) * | 2019-04-08 | 2019-06-28 | 宁波中科远东催化工程技术有限公司 | A kind of distillation system and method for coal-ethylene glycol |
| CN109956851A (en) * | 2019-04-08 | 2019-07-02 | 宁波中科远东催化工程技术有限公司 | The system and method for ethylene glycol rectifying in synthesis gas preparing ethylene glycol |
| CN111592446A (en) * | 2020-06-10 | 2020-08-28 | 东华工程科技股份有限公司 | Rectification system and process for preparing ethylene glycol by dimethyl oxalate hydrogenation |
| CN112062654A (en) * | 2020-08-21 | 2020-12-11 | 陕西聚能新创煤化科技有限公司 | Ethylene glycol rectification system and rectification process |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104725191A (en) * | 2015-03-24 | 2015-06-24 | 中国五环工程有限公司 | Ethylene glycol refining and separating method and system |
| CN106608814A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | Method for improving quality of glycol product made from synthetic gas |
| CN106608814B (en) * | 2015-10-22 | 2020-01-03 | 中国石油化工股份有限公司 | Method for improving quality of product of preparing ethylene glycol from synthesis gas |
| CN106946654A (en) * | 2017-03-29 | 2017-07-14 | 东华工程科技股份有限公司 | A kind of separation method of biomass ethylene glycol |
| CN108329193A (en) * | 2018-04-03 | 2018-07-27 | 烟台国邦化工机械科技有限公司 | One kind being used for coal-ethylene glycol industry ethylene glycol recovery process method and system |
| CN109678666A (en) * | 2019-02-22 | 2019-04-26 | 乐陵聚久环保科技有限公司 | A kind of recovery method of synthesis gas preparing ethylene glycol waste liquid |
| CN109939456A (en) * | 2019-04-08 | 2019-06-28 | 宁波中科远东催化工程技术有限公司 | A kind of distillation system and method for coal-ethylene glycol |
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| RU2762566C2 (en) * | 2019-04-08 | 2021-12-21 | Нингбо Фарист Тех Каталист Инжиниринг Ко., Лтд | System and method for gas synthesis for rectification of ethylene glycol in production of ethylene glycol |
| CN111592446A (en) * | 2020-06-10 | 2020-08-28 | 东华工程科技股份有限公司 | Rectification system and process for preparing ethylene glycol by dimethyl oxalate hydrogenation |
| CN112062654A (en) * | 2020-08-21 | 2020-12-11 | 陕西聚能新创煤化科技有限公司 | Ethylene glycol rectification system and rectification process |
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