CN207384883U - A kind of environment-protecting clean device for separating organic azeotropic mixture - Google Patents

A kind of environment-protecting clean device for separating organic azeotropic mixture Download PDF

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Publication number
CN207384883U
CN207384883U CN201721422566.9U CN201721422566U CN207384883U CN 207384883 U CN207384883 U CN 207384883U CN 201721422566 U CN201721422566 U CN 201721422566U CN 207384883 U CN207384883 U CN 207384883U
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cooler
rectifying
azeotropic mixture
environment
tank
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张春灵
毛学峰
孙丽欣
李晓宁
于秀刚
李小刚
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YANTAI GUOBANG CHEMICAL MACHINE TECHNOLOGY Co Ltd
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YANTAI GUOBANG CHEMICAL MACHINE TECHNOLOGY Co Ltd
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Abstract

The utility model discloses a kind of environment-protecting clean device for separating organic azeotropic mixture, which is arranged on rectifying column lower end, and rectifying still is internally provided with primary heater, rectifying still connection rectifying column;Connection condenser inlet at the top of rectifying column;Condensator outlet connects reflux ratio distributor;Reflux ratio distributor one end connects rectifying column, and the reflux ratio distributor other end connects the first cooler entrance;The quantity of isolate receiving tank is at least 1, and each isolate receiving tank entrance is commonly connected to the first cooler outlet, and each isolate receiving tank outlet is commonly connected to tail cooler entrance;Tail cooler connects the cold tank of tail.The utility model can be to there are minimum azeotrope composition, either there are two kinds or two or more components of dissolving each other of association phenomenon, the separated object system of the two can be separated after adding in the third component, new dangerous waste will not be generated, also avoids bringing new impurity, clean environment firendly into.

Description

A kind of environment-protecting clean device for separating organic azeotropic mixture
Technical field
The utility model is related to a kind of environment-protecting clean devices for separating organic azeotropic mixture, belong to organic Azeotrope separation technology Field.
Background technology
Azeotropic mixture refers to the mixture of a variety of insoluble or sl. sol. substance (between solid or between liquid) composition, composition Change anyway, boiling point is definite value, and evaporates composition and fix, until measuring few side whole evaporation.In azeotropic mixture When reaching its azeotropic point, since the component ratio of gas part caused by its boiling is identical with liquid portion, nothing Method is separated solution compolision with distillating method.That is, two constituents of azeotropic mixture, can not with simple distillation or The mode of fractionation separates.
Azeotrope refers to the mixture of a variety of phase solution body compositions, and when there is vapour pressure overgauge and minus deviation, institute is right The mixture for the fixed composition answered, the bubble point temperature and evaporation composition of feature are formed according to liquid phase and changed, only in constant boiling point Liquid mixture under composition can just be evaporated according to the corresponding ratio of constant boiling point.For azeotrope, the steam for generation of seething with excitement at this time It is made of in itself identical with liquid.
And not all binary liquid mixtures can all form azeotrope, the temperature-component phase diagram of this knd of mixture has Significant feature, i.e. its gaseous line (gas-liquid mixture and gaseous boundary) and the liquidus curve (friendship of liquid and gas-liquid mixture Boundary) there are common peak or minimum point, so point is peak, then referred to as positive azeotrope;So point is minimum point, then claims To bear azeotrope.Most of azeotropes are all negative azeotropes, that is, have minimum boiling point.
Some organic compounds can form azeotropic mixture with water, the characteristic can be utilized, in organic matter to be dried A certain organic matter in azeotropic composition is added in, because the boiling point of azeotropic mixture is usually less than the boiling point of organic matter to be dried, so Water can be brought out during distillation, it is dry so as to achieve the purpose that.
Association phenomenon refers to the identical or different intermolecular change for not causing chemical property, and (such as matches somebody with somebody by weaker bonding force Position covalent bond, hydrogen bond) combine the phenomenon that, do not cause the change of covalent bond.Association does not cause the change of covalent bond;Association does not cause The change of chemical property;It associates for reversible process;Association is influenced by medium polarity and system temperature;It is main to form molecular association The reason is that intermolecular formation hydrogen bond;Some are to form coordinate bond;Some are the interactions by dipole in polar molecule.
At present, the waste liquid that pharmaceutical factory generates, the product category produced according to pharmaceutical factory are different, it is possible to create different component Waste liquid.In the diisopropylamine aqueous solution discharged such as pharmaceutical factory, often containing a small amount of tetrahydrofuran, in raw material diisopropylamine and There are minimum azeotrope compositions between water, tetrahydrofuran and water.It is different according to azeotropic point temperature, it can be by tetrahydrofuran and diisopropylamine It separates.The azeotropic of the tetrahydrofuran steamed and water is formed and handled by tetrahydrofuran retracting device by conventional method, is obtained aqueous Diisopropylamine mixed liquor after, with alkali is added to be dehydrated, then by being refining to obtain qualified diisopropylamine product, traditional device and Process can generate substantial amounts of salkali waste, bring new impurity into, be easy to cause environmental pollution.The acetic acid that for another example pharmacy generates is water-soluble Often containing a small amount of toluene in liquid, if in solution being only the separation of acetic acid and water, then add in the third and do not exist with acetic acid The entrainer of azeotropic, such as propyl acetate etc., it is not with acetic acid azeotropic, azeotrope with water and immiscible with water, it is more satisfactory Entrainer.If also contain toluene in addition to acetic acid and water in solution, then add other components, will introduce new miscellaneous Matter so as to generate new hazardous waste, causes environmental pollution.
Utility model content
The purpose of this utility model is to provide a kind of environment-protecting clean device for separating organic azeotropic mixture, for existing most For low azeotropic composition either there are two kinds or two or more components of dissolving each other of association phenomenon, adding in after the third component can be by the two Separated object system is separated.
The technical solution that the utility model solves above-mentioned technical problem is as follows:A kind of environment-protecting clean for separating organic azeotropic mixture Device, including rectification cell, the rectification cell includes rectifying still, rectifying column, condenser, reflux ratio distributor, the first cooling Device, isolate receiving tank, tail cooler, the cold tank of tail;The rectifying still is arranged on the rectifying column lower end, and rectifying still is internally provided with One heater, rectifying still connect the rectifying column;The condenser inlet is connected at the top of the rectifying column;The condensator outlet Connect the reflux ratio distributor;Described reflux ratio distributor one end connects the rectifying column, and the reflux ratio distributor other end connects Lead to the first cooler entrance;The quantity of the isolate receiving tank is at least 1, and each isolate receiving tank entrance is common First cooler outlet is connected to, each isolate receiving tank outlet is commonly connected to the tail cooler entrance;The tail Cooler connects the cold tank of tail.
A kind of environment-protecting clean device for separating organic azeotropic mixture as described above, the rectifying still are connected with first circulation Pump.First circulation pump connects the upper and lower part of rectifying still by pipeline, and organic azeotropic mixture in rectifying still is made to form Xun Huan, from And make the uniform heated fast of organic azeotropic mixture.
A kind of environment-protecting clean device for separating organic azeotropic mixture as described above, the rectification cell include phase-splitter, institute It states phase-splitter to be arranged between first cooler and the isolate receiving tank, phase-splitter connects the rectifying still.Split-phase Organic azeotropic mixture gas-liquid mixed material that device conveys the first cooler carries out split-phase conveying.
A kind of environment-protecting clean device for separating organic azeotropic mixture as described above, described device are used to contain by toluene separation There are aqueous acetic acid or the described device of toluene for separating the diisopropylamine aqueous solution containing tetrahydrofuran, the isolate The quantity of receiving tank is 4.Using the present apparatus can to pharmaceutical factory discharge the aqueous acetic acid containing toluene or contain tetrahydrochysene The diisopropylamine aqueous solution of furans carries out organic matter separation.
A kind of environment-protecting clean device for separating organic azeotropic mixture as described above, further includes adsorption dewatering unit, the suction Attached dewatering unit includes intermediate buffer tank, adsorption tower, secondary heater, the second cooler;The intermediate buffer tank connects rectifying Isolate receiving tank in unit residing for dehydration isolate to be adsorbed;The adsorption tower connects the intermediate buffer tank, adsorption tower Top is returned and is connected to the intermediate buffer tank;The secondary heater connects the absorption tower bottom;The second cooler connection At the top of the adsorption tower.According to processing needs, the product moisture index in intermediate buffer tank is detected, it can when moisture content index is excessively high To be handled by adsorption dewatering unit.
Further, the quantity of the intermediate buffer tank is 2, and second circulation is connected between intermediate buffer tank and adsorption tower Pump.Second circulation pump carries out adsorption dewatering for the exceeded product of moisture in intermediate buffer tank to be transported in adsorption tower.
Further, the quantity of the adsorption tower is 2, and adsorption tower uses adsorbing tower with molecular sieve.Molecular sieve is that have uniformly Micropore, the comparable a kind of substance of aperture and general molecular size.Molecular sieve can make efficient drying agent, selective absorption Agent, catalyst, ion-exchanger etc. commonly use silicate or alumino-silicate that molecular sieve is crystalline state, be by oxygen-octahedron or Aluminum-oxygen tetrahedron is connected to form the duct of molecular dimension size (being usually 0.3~2nm) and cavity system by oxygen bridge key, because Binding molecule size and shape is different and has the ability for sieving fluid molecule of different sizes, and adsorbing tower with molecular sieve belongs to filler Tower, adsorption tower is interior to be filled with molecular sieve.
Further, the device equipped with adsorption dewatering unit is used for water-soluble by acetic acid of the toluene separation containing toluene Liquid or the adsorption dewatering cell arrangement that is equipped with are for diisopropylamine aqueous solution of the separation containing tetrahydrofuran, the isolate The quantity of receiving tank is 4.Using the present apparatus can to pharmaceutical factory discharge the aqueous acetic acid containing toluene or contain tetrahydrochysene The diisopropylamine aqueous solution of furans carries out product dehydrate processing, so that the organic matter moisture after separation meets index.
The present apparatus using when specifically include:
Step 1, raw material is quantitatively squeezed into rectifying still through feed pump, and according to moisture in raw material, calculating needs to add in The amount of entrainer adds in entrainer to rectifying still quantification according to calculated value and forms organic azeotropic mixture;
Step 2, rectifying still internal heater water flowing steam heats, and organic azeotropic mixture vaporization is risen in rectifying column, passes through tower Condenser condensation is pushed up, lime set passes back into rectifying column by reflux ratio distributor;
Step 3, after rectifier column reflux is stablized, according to overhead product analysis result, suitable reflux ratio is set, it successively will production Product are delivered in corresponding isolate pans.
In step 4, the product moisture index in intermediate buffer tank is detected, if moisture is above standard, passes through circulating pump Product importing adsorption tower is dehydrated, battery limit (BL) is produced after product qualification.
The beneficial effects of the utility model are:Device is equipped with rectification cell, wherein, rectifying still is arranged on rectifying column lower end, Rectifying still is internally provided with primary heater, rectifying still connection rectifying column;Connection condenser inlet at the top of rectifying column;Condensator outlet Connect reflux ratio distributor;Reflux ratio distributor one end connects rectifying column, and the reflux ratio distributor other end connects the first cooler Entrance;The quantity of isolate receiving tank is at least 1, and each isolate receiving tank entrance is commonly connected to the first cooler and goes out Mouthful, each isolate receiving tank outlet is commonly connected to tail cooler entrance;Tail cooler connects the cold tank of tail.It is de- that device is additionally provided with absorption Water unit according to processing needs, detects the product moisture index in intermediate buffer tank, can pass through suction when moisture content index is excessively high Attached dewatering unit is handled.It, can be to there are minimum azeotrope groups using the utility model device combination the utility model technique It can be by the separated object of the two after the third component into either there are two kinds or two or more components of dissolving each other of association phenomenon, adding in System is separated, and will not be generated new dangerous waste, also be avoided bringing new impurity, clean environment firendly into.
Description of the drawings
Fig. 1 is the environment-protecting clean device rectification cell schematic diagram for separating organic azeotropic mixture;
Fig. 2 is the environment-protecting clean device adsorption dewatering cell schematics for separating organic azeotropic mixture.
Specific embodiment
The principle and feature of the utility model are described below in conjunction with attached drawing, example is served only for explaining this practicality It is new, it is not intended to limit the scope of the utility model.
As shown in Figure 1, a kind of environment-protecting clean device for separating organic azeotropic mixture, including rectification cell, the rectification cell Including rectifying still 1, rectifying column 2, condenser 3, reflux ratio distributor 4, the first cooler 5, isolate receiving tank 6, tail cooler 7, The cold tank 8 of tail;The rectifying still 1 is arranged on 2 lower end of rectifying column, and rectifying still 1 is internally provided with primary heater 9, and rectifying still 1 connects Lead to the rectifying column 2;2 top of rectifying column connects 3 entrance of condenser;Reflux described in 3 outlet of condenser Than distributor 4;Described 4 one end of reflux ratio distributor connects the rectifying column 2,4 other end of reflux ratio distributor connection described the One cooler, 5 entrance;The quantity of the isolate receiving tank 6 is at least 1, and each 6 entrance of isolate receiving tank connects jointly It is exported to first cooler 5, each outlet of isolate receiving tank 6 is commonly connected to 7 entrance of tail cooler;The tail is cold Device 7 connects the cold tank 8 of the tail.
In the one embodiment of environment-protecting clean device for separating organic azeotropic mixture, the rectifying still 1 is connected with first circulation Pump 10.First circulation pump 10 connects the upper and lower part of rectifying still 1 by pipeline, forms organic azeotropic mixture in rectifying still 1 Xun Huan, so that the uniform heated fast of organic azeotropic mixture.
In the one embodiment of environment-protecting clean device for separating organic azeotropic mixture, the rectification cell includes phase-splitter 11, The phase-splitter 11 is arranged between first cooler 5 and the isolate receiving tank 6, and phase-splitter 11 connects the rectifying Kettle 1.Organic azeotropic mixture gas-liquid mixed material that phase-splitter 11 conveys the first cooler 5 carries out split-phase conveying.
In the one embodiment of environment-protecting clean device for separating organic azeotropic mixture, described device is used to contain by toluene separation There are aqueous acetic acid or the described device of toluene for separating the diisopropylamine aqueous solution containing tetrahydrofuran, the isolate The quantity of receiving tank 6 is 4.Using the present apparatus can to pharmaceutical factory discharge the aqueous acetic acid containing toluene or contain tetrahydrochysene The diisopropylamine aqueous solution of furans carries out organic matter separation.
Referring to Fig. 2, in the one embodiment of environment-protecting clean device for separating organic azeotropic mixture, device further includes adsorption dewatering Unit, the adsorption dewatering unit include intermediate buffer tank 12, adsorption tower 13, secondary heater 14, the second cooler 15;It is described Intermediate buffer tank 12 connects the isolate receiving tank 6 residing for dehydration isolate to be adsorbed in rectification cell;The adsorption tower 13 connects Lead to the intermediate buffer tank 12,13 top of adsorption tower, which is returned, is connected to the intermediate buffer tank 12;The secondary heater 14 connects institute State 13 bottom of adsorption tower;Second cooler 15 connects 13 top of adsorption tower.According to processing needs, intermediate buffering is detected Product moisture index in tank 12 can be handled when moisture content index is excessively high by adsorption dewatering unit.
In the one embodiment of environment-protecting clean device for separating organic azeotropic mixture, the quantity of the intermediate buffer tank 12 is 2 It is a, second circulation pump 16 is connected between intermediate buffer tank 12 and adsorption tower 13.Second circulation pump 16 is used for intermediate buffer tank The exceeded product of moisture, which is transported in adsorption tower 13, in 12 carries out adsorption dewatering.The quantity of the adsorption tower 13 is 2, is inhaled Attached tower uses adsorbing tower with molecular sieve 13.Molecular sieve is that have uniform micropore, aperture and the comparable one kind of general molecular size Substance.Molecular sieve can make efficient drying agent, selective absorbent, catalyst, ion-exchanger etc., commonly use molecular sieve as crystallization The silicate or alumino-silicate of state, be connected to form molecular dimension by oxygen bridge key by oxygen-octahedron or aluminum-oxygen tetrahedron it is big The duct of small (being usually 0.3-2nm) and cavity system, it is of different sizes with sieving due to binding molecule size and shape difference Fluid molecule ability, adsorbing tower with molecular sieve 13 belongs to packed tower, molecular sieve is filled in adsorption tower.
In the one embodiment of environment-protecting clean device for separating organic azeotropic mixture, the device equipped with adsorption dewatering unit For containing four by toluene aqueous acetic acid of the separation containing toluene or the adsorption dewatering cell arrangement that is equipped with for separating The diisopropylamine aqueous solution of hydrogen furans, the quantity of the isolate receiving tank 6 is 4.Pharmaceutical factory can be arranged using the present apparatus The aqueous acetic acid containing toluene gone out or the diisopropylamine aqueous solution containing tetrahydrofuran carry out product dehydrate processing, so that Organic matter moisture after separation meets index.
The utility model operating process is as follows:
Step 1, raw material is quantitatively squeezed into rectifying still through feed pump, and according to moisture in raw material, calculating needs to add in The amount of entrainer adds in entrainer to rectifying still quantification according to calculated value and forms organic azeotropic mixture;
Step 2, rectifying still internal heater water flowing steam heats, and organic azeotropic mixture vaporization is risen in rectifying column, passes through tower Condenser condensation is pushed up, lime set passes back into rectifying column by reflux ratio distributor;
Step 3, after rectifier column reflux is stablized, according to overhead product analysis result, suitable reflux ratio is set, it successively will production Product are delivered in corresponding isolate pans.
In the one embodiment for separating the environment-friendly clean process method of organic azeotropic mixture, the method further includes step 4, inspection Survey intermediate buffer tank in product moisture index, if moisture is above standard, by circulating pump by product import adsorption tower into Row is dehydrated, and battery limit (BL) is produced after product qualification.
Using the utility model, by taking the blending ingredients separation of diisopropylamine, tetrahydrofuran, water as an example:
Contain a small amount of tetrahydrofuran in the diisopropylamine aqueous solution that pharmaceutical factory gets off, the property of wherein each component is as follows:
Physical property:
The property of azeotropic mixture:
Raw material is quantitatively squeezed into rectifying still through feed pump, and according to moisture in raw material, calculating needs to add in tetrahydrochysene furan The amount muttered;
From the tetrahydrofuran entrainer that tank field is come through feeding flow control system, rectifying still is quantitatively entered according to the inlet amount table of comparisons In;
Primary heater water flowing steam heats in rectifying still, and material vaporization is risen in rectifying column, passes through overhead condenser Condensation, lime set pass back into rectifying column by reflux ratio distributor;After rectifying tower top infinite reflux is stablized, analyzed and tied according to overhead product Fruit sets suitable reflux ratio, sequentially into corresponding isolate receiving tank:
The azeotropic composition azeotropic mixture of water (tetrahydrofuran with) of extraction is produced in the corresponding pans of azeotropic mixture outside battery limit (BL) To tetrahydrofuran recovery unit;
Interim fraction (tetrahydrofuran and diisopropylamine) is produced to the corresponding pans of interim fraction, returns to rectifying still under Batch raw material rectifying;
Diisopropylamine is produced to the corresponding pans of diisopropylamine product, is produced to intermediate buffer tank;
Raffinate cools down discharge after multiple batches of rectifying in rectifying still.
Further, according to product requirement, the moisture content index in intermediate buffer tank is detected, if moisture > 100PPm, It is pumped by second circulation and is dehydrated through adsorbing tower with molecular sieve, until producing battery limit (BL) after product qualification.
Using the utility model, by taking the aqueous acetic acid blending ingredients separation containing toluene as an example:
Often contain a small amount of toluene in the aqueous acetic acid that pharmaceutical factory gets off, the property of wherein each component is as follows:
Physical property:
The property of azeotropic mixture:
Raw material is quantitatively squeezed into rectifying still through feed pump, and according to moisture in raw material, calculating needs to add in toluene Amount;
Primary heater water flowing steam heats in rectifying still, and material vaporization is risen in rectifying column, passes through overhead condenser Condensation, lime set pass back into rectifying column by reflux ratio distributor;After rectifying tower top infinite reflux is stablized, analyzed and tied according to overhead product Fruit sets suitable reflux ratio, sequentially into corresponding isolate receiving tank:
Azeotropic composition (azeotropic mixture of toluene and water) is produced after phase-splitter split-phase, water mutually produces receiving corresponding to water In tank, toluene mutually returns to rectifying still;
When moisture has been adopted soon in devices, rectifying tower top extraction is switched into the corresponding pans of interim fraction, returns to essence Kettle is evaporated with lower batch raw material rectifying;
Acetic acid is produced to the corresponding pans of acetate products, is produced outside battery limit (BL);
Raffinate cools down discharge after multiple batches of rectifying in rectifying still.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality Within new spirit and principle, any modifications, equivalent replacements and improvements are made should be included in the guarantor of the utility model Within the scope of shield.

Claims (8)

1. a kind of environment-protecting clean device for separating organic azeotropic mixture, it is characterised in that:Including rectification cell, the rectification cell bag Include rectifying still, rectifying column, condenser, reflux ratio distributor, the first cooler, isolate receiving tank, tail cooler, the cold tank of tail;Institute It states rectifying still and is arranged on the rectifying column lower end, rectifying still is internally provided with primary heater, and rectifying still connects the rectifying column;Institute It states and the condenser inlet is connected at the top of rectifying column;The condensator outlet connects the reflux ratio distributor;The reflux ratio Distributor one end connects the rectifying column, and the reflux ratio distributor other end connects the first cooler entrance;The isolate The quantity of receiving tank is at least 1, and each isolate receiving tank entrance is commonly connected to first cooler outlet, Mei Gefen The tail cooler entrance is commonly connected to from the outlet of object receiving tank;The tail cooler connects the cold tank of tail.
2. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 1, it is characterised in that:The rectifying Kettle is connected with first circulation pump.
3. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 1, it is characterised in that:The rectifying Unit includes phase-splitter, and the phase-splitter is arranged between first cooler and the isolate receiving tank, and phase-splitter connects Lead to the rectifying still.
4. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 3, it is characterised in that:Described device For separating the aqueous acetic acid containing toluene or described device by toluene for diisopropylamine of the separation containing tetrahydrofuran Aqueous solution, the quantity of the isolate receiving tank is 4.
5. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 1, it is characterised in that:Further include suction Attached dewatering unit, the adsorption dewatering unit include intermediate buffer tank, adsorption tower, secondary heater, the second cooler;In described Between surge tank connection rectification cell in it is to be adsorbed dehydration isolate residing for isolate receiving tank;During the adsorption tower connection is described Between surge tank, return at the top of adsorption tower and be connected to the intermediate buffer tank;The secondary heater connects the absorption tower bottom;It is described Second cooler is connected at the top of the adsorption tower.
6. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 5, it is characterised in that:The centre The quantity of surge tank is 2, and second circulation pump is connected between intermediate buffer tank and adsorption tower.
7. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 5, it is characterised in that:The absorption The quantity of tower is 2, and adsorption tower uses adsorbing tower with molecular sieve.
8. a kind of environment-protecting clean device for separating organic azeotropic mixture according to claim 5, it is characterised in that:Described device For separating the aqueous acetic acid containing toluene or described device by toluene for diisopropylamine of the separation containing tetrahydrofuran Aqueous solution, the quantity of the isolate receiving tank is 4.
CN201721422566.9U 2017-10-30 2017-10-30 A kind of environment-protecting clean device for separating organic azeotropic mixture Active CN207384883U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107998678A (en) * 2017-10-30 2018-05-08 烟台国邦化工机械科技有限公司 A kind of environment-protecting clean device and process for separating organic azeotropic mixture
CN108947893A (en) * 2018-08-10 2018-12-07 山东昆达生物科技有限公司 A kind of post-processing approach and device of pyridine Light chlorimation mother liquor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107998678A (en) * 2017-10-30 2018-05-08 烟台国邦化工机械科技有限公司 A kind of environment-protecting clean device and process for separating organic azeotropic mixture
CN107998678B (en) * 2017-10-30 2023-08-18 烟台国邦化工机械科技有限公司 Environment-friendly cleaning device and process method for separating organic azeotrope
CN108947893A (en) * 2018-08-10 2018-12-07 山东昆达生物科技有限公司 A kind of post-processing approach and device of pyridine Light chlorimation mother liquor

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