CN106946654A - A kind of separation method of biomass ethylene glycol - Google Patents
A kind of separation method of biomass ethylene glycol Download PDFInfo
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- CN106946654A CN106946654A CN201710196374.9A CN201710196374A CN106946654A CN 106946654 A CN106946654 A CN 106946654A CN 201710196374 A CN201710196374 A CN 201710196374A CN 106946654 A CN106946654 A CN 106946654A
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
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Abstract
The invention discloses a kind of separation method of biomass ethylene glycol, the thick ethylene glycol of raw material is made in the hydrogenated reaction of sugar juice produced using biomass, thick ethylene glycol undergoes double flash evaporation, lightness-removing column, propane diols treating column, weight-removing column and purifying ethylene glycol tower and realizes separation successively, the ethylene glycol and propylene glycol product of high-class product are obtained, solves the problems, such as that PET present in current biomass ethylene glycol technique polymerize fusing point and colourity.The heat recovery of purifying ethylene glycol tower is used for lightness-removing column present invention employs the thermal coupling technique of intermediate reboiler, considerably reduce the energy consumption of process, economic benefit is obvious, skill process raw material uses biomass for raw material, and the containing alcohol waste water produced in flow is easy to using the processing of the methods such as biochemistry, is a kind of environmental protection technique.
Description
Technical field
The invention belongs to chemical separation engineering field, more particularly to a kind of separation method of biomass ethylene glycol.
Background technology
Ethylene glycol（EG）Widely used as important Organic Chemicals, demand is big, fine mainly for the manufacture of synthesis
Dimension, synthetic resin, plasticizer, cosmetics and explosive etc., are also used for preparing low-freezing freezing liquid.
China's polyester industrial is fast-developing in recent years, and quick growth trend is kept to ethylene glycol demand.Due to domestic insufficiency of supply-demand
Very big, the yield of numerous domestic device can not still meet domestic actual demand, also need to rely on a large amount of imports.Therefore, ethylene glycol exists
China has good development prospect.
The production line of current ethylene glycol mainly has two kinds：Wherein petroleum path uses ethene for raw material, by epoxidation
Epoxy ethane（EO）, oxirane obtains ethylene glycol after hydration.The mature technology, but by cost of material and come
Source influences, and production cost is higher；Process route is longer.Another with coal, natural gas etc. for raw material, by synthesis gas route system
Take ethylene glycol, it is cheap due to the raw materials technology wide material sources, the advantages of Technical Economy is high and as studying in the last few years
Focus.
Biomass is produced as a kind of important renewable resource by the raw material such as raw material substitution oil or coal of biomass
Ethylene glycol, not only with advantages such as abundant, the flexible, energy-saving and emission-reduction of process route of raw material resources, and asked ethylene glycol for expansion
The source of product provides more choices.
Biomass catalyzing conversion preparing ethylene glycol it is a technical advantage that：（1）Biomass is renewable resource.With petroleum path
Production ethylene glycol is compared, and can greatly reduce CO2Net discharge, and wide material sources, with cost advantage；（2）Process route letter
It is single.The catalytic process uses one-step method, and several reactions such as biomass by hydrolyzation, cracking, hydrogenation are coupling in a reactor
OK, it enormously simplify technological process；（3）Catalytic process environmental protection.The reaction is carried out in aqueous phase, and not adding any has
Machine solvent；（4）The selectivity of purpose product ethylene glycol is high.Under the reaction condition of optimization, biomass can be with 100% conversion, product
The selectivity of middle ethylene glycol
Reach 60-76%.（5）It is with low cost using non-precious metal catalyst.Thus, biomass catalyzing conversion preparing ethylene glycol has
Fabulous application prospect.
The B of Chinese patent CN 102675045 describe a kind of high concentration sugar solution produced using biomass as raw material preparation
The method of ethylene glycol.Reaction is carried out in high-pressure stirring reactor, using compound non-precious metal as the catalyst of reaction,
120-300 DEG C, ethylene glycol and propane diols are prepared under conditions of Hydrogen Vapor Pressure 1-13MPa, obtained ethylene glycol and propane diols yield
Can+reach ~ 60%.
Current ethylene glycol separation and purification technique is primarily directed to traditional oil and synthesis gas production line.Oxirane road
The ethylene glycol that ethylene glycol crude product is refining to obtain respectively through dehydrating tower, MEG rectifying columns, DEG rectifying columns and TEG rectifying columns in line
Product.The A of Chinese patent CN 103553877 describe the method that synthesis gas route produces ethylene glycol rectifying separation, thick ethylene glycol
The first in ethylene glycol crude product is removed by methanol distillation column, dehydrating tower, dealcoholysis tower, purifying ethylene glycol tower and ethylene glycol recovery tower
Alcohol, ethanol, dimethyl oxalate, the component, the high-class product ethylene glycol being refining to obtain such as butanediol.
The difference of ethylene glycol is produced with traditional oil and synthesis gas route, biomass route is due to thick ethylene glycol raw material group
Into difference, constitute increasingly complex, mainly water, ethylene glycol, propane diols, remaining element alcohols, polyalcohol, ethers, corresponding need
The refining separation method wanted is different.The A of Chinese patent CN 104693007 describe a kind of porous carbon adsorption refining biomass second two
The scheme of alcohol, porous carbon can high-temperature calcination regeneration.But this adsorption refining scheme often dimension-limited, it is difficult to adapt to extensive
The requirement of production.Biomass ethylene glycol product purity only 98.8% prepared by domestic Changchun Dacheng Industry Group Co., Ltd, although
PET can be up to state standards after polymerization, but the product purity of second two is slightly less than《Industrial spent glycol》In GB/T 4649-2008
It is defined to require.In addition, biomass ethylene glycol contains the impurity such as propane diols, butanediol, its PET fusing point produced decreases,
And there is certain colourity.Therefore the product purity and product quality of ethylene glycol how are further improved, makes biomass ethylene glycol
It is a major challenge that biomass ethylene glycol large-scale application is faced to reach polyester grade standard.
The content of the invention
The purpose of the present invention is that the thick ethylene glycol separating technology produced for current biomass route catalyzed conversion is present
Problem proposes that a kind of product quality is high, Technical Economy is good, energy-conserving and environment-protective ethylene glycol separating technologies.
The technique is for the biomass method described in the B of Chinese patent CN 102675045, i.e., using biomass such as stalks
As raw material in high-pressure stirring reactor hydrogenation reaction occurs for the sugar juice produced, obtained thick second
Glycol goes to the separator described in patent of the present invention.
A kind of separation method of biomass ethylene glycol, it is characterised in that including be sequentially connected flash system, lightness-removing column system
System, propane diols refine Tower System, weight-removing column system and purifying ethylene glycol Tower System.
Wherein flash system sets high pressure flash knockout drum, low pressure flash knockout drum and flash distillation gas condenser, for removing
The low boiling component such as a small amount of water, methanol, ethanol in thick ethylene glycol.
Lightness-removing column system is set in lightness-removing column, condenser of light component removal column, lightness-removing column return tank, lightness-removing column reboiler, lightness-removing column
Between reboiler and correspondence vacuum system；Main purpose is the component than propane diols low boiling point that will be fed in thick ethylene glycol（Mainly
Containing alcohol waste water）Removing.
Propane diols refines Tower System and sets propane diols treating column, propane diols treating column condenser, the backflow of propane diols treating column
Tank, propane diols treating column reboiler and correspondence vacuum system；Main purpose is to reclaim a small amount of the third two in the thick ethylene glycol of charging
Alcohol, produces qualified propylene glycol product.
Weight-removing column system sets weight-removing column, weight-removing column condenser, weight-removing column return tank, weight-removing column reboiler and correspondence vacuum
System；Main purpose is will to feed heavy constituent higher than ethylene glycol boiling point in thick ethylene glycol（Mainly polyalcohols material) it is de-
Remove.
Purifying ethylene glycol tower sets purifying ethylene glycol tower, purifying ethylene glycol tower condenser, purifying ethylene glycol tower return tank, second
Glycol treating column reboiler, ethylene glycol product cooler and correspondence vacuum system.Main purpose is by dihydric alcohol in thick ethylene glycol
（Such as 1,2- butanediols, 2,3-butanediol etc.）Removing, while purification obtains the ethylene glycol product of high-class product.
A kind of separation method of biomass ethylene glycol, it is characterised in that comprise the following steps：
1. the thick ethylene glycol from ethylene glycol synthesis reactor
Adjusted valve depressurizes laggard high pressure flash knockout drum, and adjusted valve depressurizes laggard low pressure flash point to the thick ethylene glycol in its bottom again
From tank, low pressure flash vapour and the high pressure flash vapour through decompression go to flash distillation gas condenser condensation after converging, and condensate liquid is useless for containing alcohol
Water, goes to sewage-treatment plant processing.And the pressured difference of thick ethylene glycol of low pressure flash knockout drum bottom enters the lightness-removing column in downstream.
2. the thick ethylene glycol from low pressure flash knockout drum enters lightness-removing column, and its overhead vapours is through condenser of light component removal column
Laggard lightness-removing column return tank is condensed, condensate liquid is mainly containing alcohol waste water, and part returns to overhead reflux, and remaining is gone at sewage
Manage device.Lightness-removing column is provided with lightness-removing column reboiler and lightness-removing column intermediate reboiler provides heat, and tower bottoms is sent after being boosted through pump
To propane diols treating column.
3. the thick ethylene glycol from lightness-removing column tower reactor enters propane diols treating column, and its overhead vapours is refined through propane diols
Tower condenser condenses laggard propane diols treating column return tank, and part returns to overhead reflux, and remaining goes cold through propylene glycol product
But device, which is cooled to after normal temperature, delivers to tank field.Propane diols treating column is provided with propane diols treating column reboiler and provides heat, tower tower reactor
Liquid delivers to weight-removing column after being boosted through pump.
4. the thick ethylene glycol from propane diols treating column enters weight-removing column, and its overhead vapours is cold through weight-removing column condenser
Laggard weight-removing column return tank is coagulated, condensate liquid is mainly ethylene glycol, and part returns to overhead reflux, and remaining removes purifying ethylene glycol
Tower.Weight-removing column is provided with weight-removing column reboiler and provides heat.Tower bottoms is partly used for reboiler after being boosted through circulating pump and circulated, its
Delivered to out-of-bounds after the remaining cooling through heavy constituent cooler.
5. the thick ethylene glycol from weight-removing column enters purifying ethylene glycol tower, and its overhead vapours is cold through purifying ethylene glycol tower
Condenser condenses laggard purifying ethylene glycol tower return tank, and condensate liquid part returns to overhead reflux, and remaining removes light fraction cooler
Delivered to out-of-bounds after cooling.Purifying ethylene glycol tower is provided with purifying ethylene glycol tower reboiler and provides heat.After tower bottoms boosts through pump
Delivered to after cooling out-of-bounds together with weight-removing column tower bottoms.Purifying ethylene glycol tower side take-off high-class product ethylene glycol product, through second
Tank field is delivered to after the cooling of glycol reactor product cooler.
High-class product refers to meeting《Industrial spent glycol》The product of high-class product requirement specified in GB/T 4649-2008.
The separation method of biomass ethylene glycol of the present invention, it is characterised in that：There is provided high pressure flash and low pressure are dodged
Double flash evaporation is steamed, which part low-boiling-point substance, high pressure flash separation 1~5MPa of pressure tank, low pressure flash separation pressure tank 0.2 is removed
~1MPa.
The separation method of biomass ethylene glycol of the present invention, it is characterised in that：Each rectifying column uses vacuumizing, by
Vavuum pump pumping ensures the vacuum required for rectifying column operation.This is to reduce the operation temperature of each rectifying column, prevent
Dehydrating condensation side reaction occurs for alcohols in crude product under high temperature, reduces the yield of product, adverse effect is brought to separating effect.
Heat needed for each tower reactor reboiler is provided by 1.0~2.0MPa steam.
The separation method of biomass ethylene glycol of the present invention, it is characterised in that：Lightness-removing column is provided with intermediate reboiler；
Purifying ethylene glycol tower condenser is useless pot pattern, the latent heat by-product about 0.2Mpa low-pressure steams condensed using overhead vapours, the steaming
Vapour goes to lightness-removing column intermediate reboiler as thermal source.Water content is higher in the thick ethylene glycol produced due to biomass method, will
Moisture removal needs to consume amount of heat, i.e. lightness-removing column energy consumption is higher, but can be greatly lowered by the thermal coupling technique whole
The steam consumption of individual separation process, improves the economy of process.
The separation method of biomass ethylene glycol of the present invention, it is characterised in that：The ethylene glycol product being refining to obtain is pure
Degree >=99.8wt%, butanediol content≤100ppm, UV transmittance is：During 220nm >=75%, 275nm when >=92%, 350nm >=
99%.Propylene glycol product propane diols >=the 99.5wt% being refining to obtain.Because the separating technology is stripped of propane diols and butanediol, solution
The PET present in current biomass ethylene glycol technique that determined polymerize fusing point and colourity problem.
Biomass ethylene glycol separating technology of the present invention, its technological process is simple and direct；Because process employs centre
The technique of reboiler, is used for lightness-removing column by the heat of the recovery of purifying ethylene glycol tower, considerably reduces the energy consumption of process, economical
Benefit is obvious.The containing alcohol waste water that technical process raw material is produced in using biomass for raw material, and flow is easy to using biochemistry etc.
Method processing, the process extractant big without toxicity is introduced is a kind of available for heavy industrialization environmental protection technique.
Brief description of the drawings
Fig. 1 is biomass ethylene glycol separating technology FB(flow block) of the present invention；It is necessary in flow for simple flow
Transfer tube is omitted.
Fig. 2 biomass ethylene glycol separating technology flow charts of the present invention, 1 is high pressure flash knockout drum, and 2 be that low pressure is dodged
Knockout drum is steamed, 3 be flash distillation gas condenser, and 4 be lightness-removing column, and 5 be condenser of light component removal column, and 6 be lightness-removing column return tank, and 7 be lightness-removing column
Reboiler, 8 be lightness-removing column intermediate reboiler, and 9 be propane diols treating column, and 10 be propane diols treating column condenser, and 11 be propane diols
Treating column return tank, 12 be propane diols treating column reboiler, and 13 be weight-removing column, and 14 be weight-removing column condenser, and 15 return for weight-removing column
Tank is flowed, 16 be weight-removing column reboiler, and 17 be purifying ethylene glycol tower, and 18 be purifying ethylene glycol tower condenser, and 19 be purifying ethylene glycol
Tower return tank, 20 be purifying ethylene glycol tower reboiler, and 21 be ethylene glycol product cooler.
Embodiment
It is fermented to produce xylose solution using stalk as initial feed, hydrogenation occurs in high-pressure stirring reactor anti-
Should, go out the thick ethylene glycol main component water of reactor（Content~70%）, propane diols（Content~3%）, ethylene glycol（Content~
15%）, remaining is mainly alcohols, ether material.The thick ethylene glycol passes through following steps：
1. flash system：The thick adjusted valve of ethylene glycol depressurizes laggard high pressure flash knockout drum 1, the height at the top of it
Press the adjusted laggard flash distillation gas condenser 3 of valve decompression of flash steam；Adjusted valve decompression is laggard low again for the thick ethylene glycol in its bottom
Flash separation tank 2, the low pressure flash vapour at the top of it and the high pressure flash vapour through decompression is pressed to go to flash distillation gas condenser 3 after converging cold
Solidifying, condensate liquid is containing alcohol waste water, goes to sewage-treatment plant processing.And the pressured difference of thick ethylene glycol of low pressure flash knockout drum bottom
Enter the lightness-removing column 4 in downstream.
2. lightness-removing column system：Thick ethylene glycol from low pressure flash knockout drum 2 enters lightness-removing column 4, and its tower top steams
Vapour condenses laggard lightness-removing column return tank 6 through condenser of light component removal column 5, and condensate liquid is mainly containing alcohol waste water, and part returns to tower top
Backflow, remaining goes to sewage-treatment plant.Lightness-removing column is provided with lightness-removing column reboiler 7 and lightness-removing column intermediate reboiler 8, respectively by
Middle pressure steam and low-pressure steam from purifying ethylene glycol tower condenser by-product carry out heat supply.Lightness-removing column tower bottoms is sent after being boosted through pump
To propane diols treating column 9.
3. propane diols refines Tower System：Thick ethylene glycol from lightness-removing column tower reactor enters propane diols treating column 9, its
Overhead vapours condenses laggard propane diols treating column return tank 11 through propane diols treating column condenser 10, and condensate liquid is to conform to
The propylene glycol product asked, part returns to overhead reflux, and remaining goes after being cooled to normal temperature through propylene glycol product cooler to deliver to tank field.
Propane diols treating column is provided with propane diols treating column reboiler 12, by middle pressure steam heat supply.Propane diols treating column tower bottoms is through pump
Weight-removing column 13 is delivered to after boosting.
4. weight-removing column system：Thick ethylene glycol from propane diols treating column tower reactor enters weight-removing column 13, and its tower top steams
Vapour condenses laggard weight-removing column return tank 15 through weight-removing column condenser 14, and condensate liquid is mainly ethylene glycol, and part returns to tower
Top backflow, remaining removes purifying ethylene glycol tower 17.Weight-removing column is provided with weight-removing column reboiler 16, is forced cyclic type reboiler, by
Middle pressure steam heat supply.Weight-removing column tower bottoms is mostly used in reboiler circulation after being boosted through circulating pump, remaining restructuring lease making restructuring
Delivered to out-of-bounds after dividing cooler cooling.
5. purifying ethylene glycol Tower System：Thick ethylene glycol from weight-removing column tower top enters purifying ethylene glycol tower 17, its
Overhead vapours condenses laggard purifying ethylene glycol tower return tank 19 through purifying ethylene glycol tower condenser 18, and condensate liquid part is returned
Overhead reflux, remaining goes light fraction cooler to be delivered to out-of-bounds after cooling down.Purifying ethylene glycol tower is provided with purifying ethylene glycol tower and boiled again
Device 20, by middle pressure steam heat supply.Purifying ethylene glycol tower tower bottoms is sent after cooling after being boosted through pump together with weight-removing column tower bottoms
To out-of-bounds.Purifying ethylene glycol tower side take-off high-class product ethylene glycol product delivers to tank after being cooled down through ethylene glycol product cooler 21
Area.
Embodiment 1
According to above step, the adjusted valve of thick ethylene glycol from autoclave is decompressed to 2.5MPaG and enters high pressure flash separation
Tank, adjusted valve is decompressed to 0.5MPaG and enters low pressure flash knockout drum the thick ethylene glycol in its bottom again.Lightness-removing column tower top operating pressure
18kPaA, its overhead distillate is partly refluxed in tower, and remaining goes to sewage-treatment plant, after lightness-removing column tower bottoms boosts through pump
Deliver to propane diols treating column.Propane diols refines column overhead operating pressure 18kPaA, and its overhead distillate is partly refluxed in tower, its
The remaining propylene glycol product to refine, propane diols treating column tower bottoms delivers to weight-removing column after being boosted through pump.Weight-removing column tower top operation pressure
Power 3.5kPaA, its overhead distillate is partly refluxed in tower, and remaining removes purifying ethylene glycol tower.Purifying ethylene glycol column overhead is operated
Pressure 18kPaA, its overhead distillate is partly refluxed in tower, and remaining goes light fraction to deliver to after cooling out-of-bounds.Purifying ethylene glycol
The ethylene glycol product of the high-class product of tower side take-off delivers to tank field after cooling.
Each rectifying column is evacuated the vacuum required for maintaining using respective vavuum pump above.Each tower tower reactor reboiler is used
1.5MPa middle pressure steam provides the heat required for rectifying separation, consumes middle pressure steam~12t/t ethylene glycol.
The ethylene glycol product purity 99.9wt% of gained, butanediol content 55ppm, UV transmittance is：During 220nm >=
When 85%, 275nm >=94%, 350nm >=99.5%, meet national standard《Industrial spent glycol》Provided in GB/T 4649-2008
High-class product requirement.The propylene glycol product purity 99.6wt% of gained, meets national standard《Food additives propane diols》GB
29216-2012 set quotas.
Embodiment 2
Similar to Example 1, difference is lightness-removing column there is provided intermediate reboiler；Purifying ethylene glycol tower sets useless pot, profit
The latent heat by-product 0.2Mpa low-pressure steams condensed with overhead vapours, the steam goes to lightness-removing column intermediate reboiler as thermal source.
By thermal coupling technique above, ethylene glycol product per ton can steam saving 2.8t, device steam consumption reduces~
24%。
The invention provides a kind of separating technology of biomass ethylene glycol, with obvious and power savings advantages and environmental benefit.
Illustrated in conjunction with the embodiments.Pertinent art can be carried out suitably changing completely according to the method that provide of the present invention or
Person's change combination, to realize the technology.It should be strongly noted that all these similar by the methods progress of the invention provided
Change or change combination, will be apparent to persons skilled in the art, be considered as the present invention spirit, scope and
In content.
Claims (6)
1. a kind of separation method of biomass ethylene glycol, it is characterised in that flash system of the thick ethylene glycol through being sequentially connected, de- light
Tower System, propane diols refine Tower System, weight-removing column system and purifying ethylene glycol Tower System.
2. the separation method of biomass ethylene glycol according to claim 1, it is characterised in that flash system is dodged including high pressure
Steam knockout drum, low pressure flash knockout drum and flash distillation gas condenser；Lightness-removing column system includes lightness-removing column, condenser of light component removal column, takes off light
Tower return tank, lightness-removing column reboiler, lightness-removing column intermediate reboiler and correspondence vacuum system；Propane diols, which refines Tower System, includes the third two
Alcohol treating column, propane diols treating column condenser, propane diols treating column return tank, propane diols treating column reboiler and correspondence vacuum system
System；Weight-removing column system includes weight-removing column, weight-removing column condenser, weight-removing column return tank, weight-removing column reboiler and correspondence vacuum system；
Purifying ethylene glycol Tower System includes purifying ethylene glycol tower, purifying ethylene glycol tower condenser, purifying ethylene glycol tower return tank, ethylene glycol
Treating column reboiler, ethylene glycol product cooler and correspondence vacuum system.
3. the separation method of biomass ethylene glycol according to claim 1, it is characterised in that comprise the following steps：
(1) the adjusted valve of thick ethylene glycol from ethylene glycol synthesis reactor depressurizes laggard high pressure flash knockout drum, and its bottom is thick
Adjusted valve depressurizes laggard low pressure flash knockout drum to ethylene glycol again, and low pressure flash vapour and the high pressure flash vapour through decompression are gone after converging
Toward flash distillation gas condenser condensation, condensate liquid is containing alcohol waste water, goes to sewage-treatment plant and handles, and low pressure flash knockout drum bottom
The pressured difference of thick ethylene glycol enter the lightness-removing column in downstream；
(2) the thick ethylene glycol from low pressure flash knockout drum enters lightness-removing column, and its overhead vapours condenses laggard through condenser of light component removal column
Lightness-removing column return tank, condensate liquid is mainly containing alcohol waste water, and part returns to overhead reflux, and remaining goes to sewage-treatment plant, takes off light
Tower provides heat by lightness-removing column reboiler and lightness-removing column intermediate reboiler, and tower bottoms is delivered to propane diols and refined after being boosted through pump
Tower；
(3) the thick ethylene glycol from lightness-removing column tower reactor enters propane diols treating column, and its overhead vapours is refined through propane diols
Tower condenser condenses laggard propane diols treating column return tank, and part returns to overhead reflux, and remaining goes cold through propylene glycol product
But device, which is cooled to after normal temperature, delivers to tank field, and propane diols treating column provides heat, tower bottoms warp by propane diols treating column reboiler
Weight-removing column is delivered to after pump boosting；
(4) the thick ethylene glycol from propane diols treating column enters weight-removing column, and its overhead vapours is cold through weight-removing column condenser
Laggard weight-removing column return tank is coagulated, condensate liquid is mainly ethylene glycol, and part returns to overhead reflux, and remaining removes purifying ethylene glycol
Tower, weight-removing column is provided with weight-removing column reboiler and provides heat, and tower bottoms is partly used for reboiler after being boosted through circulating pump and circulated, its
Delivered to out-of-bounds after the remaining cooling through heavy constituent cooler；
(5) the thick ethylene glycol from weight-removing column enters purifying ethylene glycol tower, and its overhead vapours is condensed through purifying ethylene glycol tower condenser
Laggard purifying ethylene glycol tower return tank, condensate liquid part returns to overhead reflux, and remaining goes light fraction cooler to deliver to boundary after cooling down
Outside, purifying ethylene glycol tower by purifying ethylene glycol tower reboiler provide heat, tower bottoms boosted through pump after with weight-removing column tower bottoms
Deliver to after cooling together out-of-bounds, purifying ethylene glycol tower side take-off high-class product ethylene glycol product, through ethylene glycol product cooler
Tank field is delivered to after cooling.
4. the separation method of biomass ethylene glycol according to claim 3, it is characterised in that：High pressure flash separates pressure tank
1-5MPa, low pressure flash separation pressure tank 0.2-1MPa.
5. the separation method of biomass ethylene glycol according to claim 1, it is characterised in that：Each rectifying column is grasped using vacuum
Make, be evacuated by vavuum pump and ensure that rectifying column operates required vacuum level requirements, the heat needed for each tower reactor reboiler is by 1.0-
2.0MPa steam is provided.
6. the separation method of biomass ethylene glycol according to claim 1, it is characterised in that：Lightness-removing column is provided with centre
Reboiler；Purifying ethylene glycol tower condenser is useless pot pattern, and the latent heat by-product about 0.2Mpa low pressure condensed using overhead vapours is steamed
Vapour, the steam goes to lightness-removing column intermediate reboiler as thermal source.
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Cited By (5)
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| CN107473937A (en) * | 2017-07-26 | 2017-12-15 | 江苏迈克化工机械有限公司 | A kind of method of withdrawal liquid chain fatty glycol |
| WO2020048444A1 (en) | 2018-09-05 | 2020-03-12 | 长春美禾科技发展有限公司 | Method for refining non-petroleum-based ethylene glycol |
| 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 |
| CN112920020A (en) * | 2021-01-29 | 2021-06-08 | 浙江恒澜科技有限公司 | Refining production line and method of 1, 3-propylene glycol |
| WO2022028319A1 (en) | 2020-08-03 | 2022-02-10 | 长春美禾科技发展有限公司 | Method for refining bio-based crude ethylene glycol |
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| CN107473937A (en) * | 2017-07-26 | 2017-12-15 | 江苏迈克化工机械有限公司 | A kind of method of withdrawal liquid chain fatty glycol |
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| WO2022028319A1 (en) | 2020-08-03 | 2022-02-10 | 长春美禾科技发展有限公司 | Method for refining bio-based crude ethylene glycol |
| 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 |
| CN112920020A (en) * | 2021-01-29 | 2021-06-08 | 浙江恒澜科技有限公司 | Refining production line and method of 1, 3-propylene glycol |
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