CN1179947C

CN1179947C - Preparation method of organic electro luminous material 8-hydroxy quinoline aluminium

Info

Publication number: CN1179947C
Application number: CNB021356157A
Authority: CN
Inventors: 许并社; 王�华; 周禾丰; 卢英兰; 郝玉英; 李洁; 郝海涛; 陆路
Original assignee: Shanxi Zhicheng Science & Technology Co Ltd
Current assignee: Shanxi Zhicheng Science & Technology Co Ltd
Priority date: 2002-09-27
Filing date: 2002-09-27
Publication date: 2004-12-15
Anticipated expiration: 2022-09-27
Also published as: CN1427001A

Abstract

The present invention relates to a preparation method for 8-hydroxyquinoline aluminum as an organic electroluminescent material. An 8-hydroxyquinoline crystal, aluminum chloride, ethanol and distilled water are mixed into solution, and combination reaction, filtration, vacuum filtration, washing, distillation for purification, and drying are carried out in a closed container, so 8-hydroxyquinoline aluminum powder with high purity is obtained. The prepared solution can also be recovered so as to separate out raw materials for reutilization. The preparation method has the advantages of convenience, high efficiency, low cost, good quality, fewer devices and high product purity. The complexes of metal materials of an 8-hydroxyquinoline class can also be prepared by the method and the principle.

Description

The preparation method of organic electro luminous material 8-hydroxy quinoline aluminium

Technical field

The present invention is a kind of preparation method of organic electro luminous material 8-hydroxy quinoline aluminium, belongs to electroluminescent organic material and the research of device and the technical field of manufacturing.

Background technology

Just begun one's study organic electroluminescent as far back as nineteen thirties, because the restriction of condition, organic electroluminescence can only be sent out dispersion of materials and in polymkeric substance, make film, obtain limited electroluminescent device, to the sixties monocrystalline electroluminescent such as anthracene, naphthalene have just appearred, therefore only just can observe light output during greater than 100 volts at driving voltage, its luminescent material, electrode materials, driving voltage all are suitable backwardnesss.

In order to reduce driving voltage, make material filmization, adopt the vacuum evaporation thin films, driving voltage is still greater than 30 volts, its device quantum yield is also very low, only is 0.05%, reaches technical development as time passes, made less than 10 volts of voltages with regard to drivable high brightness, high efficiency luminescent device with electroluminescent organic material and hole mobile material, but still can't carry out the high-grade industrialization and use.

Electroluminescent organic material has good characteristic of semiconductor, the luminosity factor height, easy conduction electron or hole, has appropriate melting point, promptly 200 ℃-400 ℃, good film-forming properties is arranged, can form the film of tens nanometer thickness of even compact free of pinholes, and good stability, but obtain highly purified organic compound electroluminescent material is quite difficult, though some developed country and China recent years have dropped into more scientific research and test, still there is certain gap from high-caliber industrial applications, especially more apparent backwardness and deficiency in the producing of high purity electroluminescent organic material, the technology of preparing defectiveness that has, the technical process that has is unreasonable, especially seems that more gap is bigger in the producing of the higher oxine aluminum of frequency of utilization, and technology falls behind, the cost height, purity is low, of poor quality, can not obtain highly purified oxine aluminium in a large number, its extract yield also has only 70-80%, gives the widespread use of this material, this type of luminescent device of suitability for industrialized production makes a big impact.

Summary of the invention

Purpose of the present invention is exactly at the deficiencies in the prior art, adopt brand-new technical process and preparation method, produce high quality, highly purified oxine aluminium with means such as the chemical substance proportioning of the best, combination reaction, vacuum filtration, distillation purification, drying forming, filtrate recovery, and can carry out suitability for industrialized production and produce, to obtain this type of a large amount of materials, to satisfy the widespread use of electroluminescent organic material and device, be applied as maximum purpose with suitability for industrialized production and commercialization.

The present invention is mainly formed by chemical substance oxine crystal, aluminum chloride, ethanol, distilled water composite reaction, and its combination matching is: (is the product unit of producing with the kilogram).

Oxine crystal: 1048-1058 weight part

Aluminum chloride: 318-328 weight part

Ethanol: 10233-10533 weight part

Distilled water: 1200-1220 weight part

The best proportioning of described chemical substance is: (is the product unit of producing with the kilogram)

Oxine crystal: 1053 weight parts

Aluminum chloride: 323 weight parts

Ethanol: 10383 weight parts

Distilled water: 1210 weight parts

Preparation technology's flow process of the present invention is as follows:

1) selected raw material

To carry out selectedly to the required raw material oxine crystal of proportioning, aluminum chloride, ethanol, distilled water, guarantee that its purity is more than 99%.

2) obtaining liq

By optimum weight part proportioning oxine crystal, ethanol are mixed in container, soak, dissolve and make solution, concentration is the 70-80 grams per liter.

By optimum weight part proportioning aluminum chloride, distilled water are mixed in molten device, soak, dissolve and make solution, concentration is the 2-3 mol.

3) mixing solutions

With the solution that oxine crystal, ethanol are made, the solution made from aluminum chloride, distilled water mixes in container, and wherein the mol ratio of oxine and aluminum chloride is 3: 1.

Add a small amount of organic bases triethylamine, the control acidity-basicity ph value is at 6-7 unit.

4) heating, constant temperature, stirring, reaction

To the reaction vessel heating of mixing solutions be housed, with control of temperature control meter and steady temperature, its temperature is controlled at 70 °-80 ℃, stirs with agitator simultaneously, makes it carry out chemical reaction.

Chemical equation is as follows:

In the formula: OH---base

N---nitrogen

ALCL ₃---aluminum chloride

O---oxygen

AL---aluminium

3HCL---hydrochloric acid

5) filter

After chemical reaction is finished, carry out solution with fine and close filtering net and filter and vacuum filtration in strainer, the yellow mercury oxide filtering separation is come out, become filter cake, yellow mercury oxide is oxine aluminium, and filtered liquid is collected storage, in order to recycling.

6) washing, vacuum filtration

With the oxine aluminium that filters to isolate, wash respectively and vacuum filtration with ethanol and distilled water, and circulation carries out 2-3 time, filter and vacuum filtration carries out in the strainer of special use, the solution behind the suction filtration is collected and is stored, and prepares against recycling.

7) oven dry

Oxine aluminium behind washing, the vacuum filtration is placed container, and put into the drying baker oven dry, bake out temperature is 70 ℃, and the time is 2 hours.

8) distillation is purified

Oxine aluminium after the oven dry is purified with steam distillation equipment, and repeat to distill twice, make oxine aluminium by the solid-state gaseous state that becomes, make the oxine aluminium of gaseous state shape steam, place condenser then, carry out condensation process, condensed solid matter is oxine aluminium.

9) secondary drying

To the oxine aluminium after the distillation purification, secondary enters the drying baker oven dry, and bake out temperature is 70 ℃, and the time is 4 hours, and the solid state chemistry material behind the secondary drying is oxine aluminium powder foam.

10) verification test

To the oxine aluminium powder foam that extracts, check, test its purity, color and luster, form, performance with instrumentation, and carry out chemical analysis.

11) packing, storage

To the oxine aluminium powder foam that extracts, in pack into the white transparent Glass Containers or stainless steel vessel, and airtight sealing up for safekeeping, place 20 ℃ ± 3 ℃ cool place, exsiccant environment, waterproof, protection against the tide, fire prevention, sun-proof, anti-soda acid to corrode.

Recovery technical process of the present invention is as follows:

1) collects solution

Filtration among the preparation technology, vacuum filtration, washing, condensed solution are collected, be stored in the container separately.

2) mixing solutions

The various solution of collecting are all placed reaction vessel, and stir, mix.

3) ethanol is reclaimed in heating fractionation

Mixing solutions is heated to 78.2 ℃ in reaction vessel, makes its fractionation, the fraction in the time of 78.2 ℃ is an alcohol gas, and alcohol gas becomes ethanol liquid after by condenser condenses, and ethanol promptly obtains reclaiming.

4) vacuum filtration reclaims oxine

Residual solution after the fractionation is put into strainer, carry out vacuum filtration, obtain filter cake on filter screen, filter cake is exactly a unreacted oxine completely, gets final product after the oven dry.

5) collect suction filtration liquid, reclaim aluminum chloride

Solution behind the vacuum filtration is collected in the special container, and this suction filtration liquid promptly is unreacted liquor alumini chloridi.

6) store, utilize

Ethanol, oxine, liquor alumini chloridi with reclaiming are stored in respectively in the container separately, in order to utilizing again.

Effect:

The present invention compares with background technology has tangible advance, it is with the oxine ethanolic soln, the aluminum chloride distilled water solution injects airtight reaction vessel, carry out combination reaction, filter then, vacuum filtration, washing, distillation is purified, oven dry, obtain high purity, high-quality oxine aluminium, its purity can reach 96.6%, also can middle filtration will be produced, vacuum filtration, washing, condensed solution reclaims, isolate starting material, utilize once more, this preparation method's technical process is easy, and equipment is made easily, the efficient height, cost is low, quality is good, can carry out heavy industrialization preparation and production, to satisfy the needs to electroluminescent organic material, also available this preparation method and principle are produced the complex compound of oxine metalloid material, are that ideal prepares extracting method.

Description of drawings:

Fig. 1 is equipped with process flow sheet for the oxine aluminum

Fig. 2 reclaims process flow sheet for oxine aluminium

Fig. 3 is equipped with technology chemical combination reactions steps figure for the oxine aluminum

Fig. 4 is equipped with process products washing step figure for the oxine aluminum

Fig. 5 is equipped with technology distillation purification step figure for the oxine aluminum

Fig. 6 is equipped with technology drying baker structure iron for the oxine aluminum

Fig. 7 reclaims the technological operation block diagram for oxine aluminium

Fig. 8 is reaction times and productive rate graph of a relation

Shown in the figure, the piece number inventory is as follows:

1, reaction vessel, 2, the water vapour well heater, 3, agitator, 4, the temperature control meter, 5, power supply, 6, container, 7, container, 8, container, 9, strainer, 10, vacuum pump, 11, filter screen, 12, weather gauge, 13, condenser, 14, oil pump, 15, agitator, 16, agitator, 17, cover plate, 18, cover plate, 19, cover plate, 20, cover plate, 21, cover plate, 22, pipeline, 23, pipeline, 24, pipeline, 25, pipeline, 26, pipeline, 27, stopping valve, 28, stopping valve, 29, stopping valve, 30, stopping valve, 31, stopping valve, 32, stopping valve, 33, container, 34, agitator, 35, strainer, 36, filter screen, 37, vacuum pump, 38, container, 39, oil pump, 40, cover plate, 41, cover plate, 42, cover plate, 43, pipeline, 44, pipeline, 45, stopping valve, 46, stopping valve, 47, stopping valve, 48, the water vapour producer, 49, process furnace, 50, distiller, 51, process furnace, 52, condenser, 53, container, 54, cover plate, 55, cover plate, 56, pipeline, 57, pipeline, 58, pipeline, 59, pipeline, 60, pipeline, 61, pipeline, 62, filter cake 63, stopping valve 65, the temperature control meter, 66, power supply, 67, reaction vessel, 68, the water vapour well heater, 69, condenser, 70, container, 71, strainer, 72, vacuum pump, 73, filter screen, 74, container, 75, oil pump, 76, container, 77, container, 78, cover plate, 79, cover plate, 80, cover plate, 81, cover plate, 82, cover plate, 83, cover plate, 84, pipeline, 85, pipeline, 86, pipeline, 87, pipeline, 88, pipeline, 89, pipeline, 90, pipeline, 91, stopping valve, 92, stopping valve, 93, stopping valve, 94, stopping valve, 95, stopping valve, 96, stopping valve, 97, stopping valve, 98, filter cake, 100, drying baker, 101, case lid, 102, gas port, 103, process furnace

Embodiment:

The present invention will be further described below in conjunction with accompanying drawing:

Shown in Fig. 1,3,4,5,6, preparation technology's operation steps of oxine aluminium is as follows:

Combination reaction---product washing---oven dry---distillation is purified---oven dry.

Combination reaction:

Before the

reaction stopping valve

27,28,29,30,31,32 is closed, be in the preceding quasi-operating status of preparation.

Preparation aluminum chloride distilled water solution in container 6, with cover plate 18 sealings, agitator 15 stirs.

Preparation oxine ethanolic soln in container 7, with cover plate 19 sealings, agitator 16 stirs.

Open stopping

valve

27,28, by

pipeline

22,23 inject reaction vessel 1 with two kinds of solution simultaneously, with cover plate 17 sealings, solution after mixing with agitator 3, temperature with temperature control meter 4 control reaction vessels 1, opening power 5, water vapour well heater 2, combination reaction begins, temperature in the reaction vessel 1 is 70 °-80 ℃, reaction times is 3 hours, stopping valve 29, air pressure in the weather gauge 12 conditioned reaction containers 1, air pressure is controlled in 1 normal atmosphere, the gas by the road 43 of discharging in the reaction vessel 1, weather gauge 12, stopping valve 29 enters condenser 13, is condensed into behind the liquid by the road 26 and enters in the container 8 and store, by cover plate 21 sealings, close stopping valve 29 after the combination reaction.

After combination reaction is finished, open stopping

valve

31,24 all inject strainer 9 with reacted solution by the road, with cover plate 20 sealings, close stopping valve 31, open vacuum pump 10, carry out vacuum filtration, dense form filter screen 11 is arranged in the strainer 9, and under the suction filtration of vacuum pump 10, yellow filter cake 62 will be formed at the top of filter screen 11, yellow filter cake 62 is exactly a product oxine aluminium, filtrate concentrate on strainer 9 below, after suction filtration is finished, close vacuum pump 10, open stopping valve 30, oil pump 14, filtrate by the

road

25,44 enter storage in the container 8, with cover plate 21 sealings, close stopping valve 30 then, oil pump 14.

The product washing:

Close stopping

valve

45,46,47 before the washing, make it be in the preceding quasi-operating status of washing.

Washing with alcohol:

Filter cake after the combination reaction 62 is taken out from strainer 9, put into container 33, add ethanol, with cover plate 40 sealings,, open stopping valve 45 after the washing with agitator 34 agitator treatings, by the road 59, solution after the washing is injected strainer 35,, close stopping valve 45 then with cover plate 41 sealings, open vacuum pump 37, carry out vacuum filtration, dense form filtering net 36 is arranged in the strainer 35, under the suction filtration of vacuum pump 37, filter cake 62 is formed once more at the top of filter screen 36, filtrate concentrates on the bottom of strainer 35, after suction filtration is finished, closes vacuum pump 37, open stopping valve 46, oil pump 39, washings by the

road

61,60 enter storage in the container 38, with cover plate 42 sealings, close stopping valve 46 then, oil pump 39.

Distilled water wash:

Filter cake after the washing with alcohol 62 is taken out from strainer 35, put into container 33 once more, add distilled water, carry out distilled water wash by above-mentioned steps.

By above-mentioned steps repeat washing with alcohol, distilled water wash each twice, take out filter cake 62 at last and place container.

Oven dry for the first time:

Filter cake 62 after the washing is placed drying baker 100 together with container, build case lid 101, open gas port 102, process furnace 103 heating, the temperature in the drying baker 100 is 70 ℃, drying time is 2 hours.

Distillation is purified:

With the filter cake 62 after the oven dry for the first time, from strainer 35, take out, put into distiller 50, add a small amount of distilled water, cover plate 54 sealings, connect water vapour producer 48 by pipeline 56, connect condenser 52 by pipeline 57, condenser 52 is connected container 53 by pipeline 58, and container 53 is by cover plate 55 sealings, open process furnace 49, water vapour producer 48 begins heating, when water vapour produces, opens process furnace 51, distiller 50 begins heating, air pressure in the water vapour well heater 48 is regulated control by stopping valve 63, and filter cake 62 becomes gaseous state after distillation, 57 enter condenser 52 by the road, condensed condensation product 58 enters storage in the container 53 by the road, and condensation product promptly is an oxine aluminium.

From container 53, take out condensation product, repeat twice, at last condensation product is placed container by above-mentioned steps.

Oven dry for the second time:

Condensation product after the distillation purification is placed drying baker 100 together with container, build case lid 101, open gas port 102, process furnace 103 heating, the temperature in the drying baker 100 is 70 ℃, drying time is 4 hours, after oven dry is finished for the second time, promptly get product oxine aluminium powder foam to the end.

Shown in Fig. 2 .7, it is as follows to reclaim the technological operation step:

Close stopping

valve

91,92,93,94,95,96,97 before the recovery, it is in reclaims preceding quasi-operating status.

Filtered liquid, the phlegma of store collected among the preparation technology are placed container 76, with cover plate 78 sealings.

The washings of store collected among the preparation technology is placed container 77, with cover plate 79 sealings.

Open stopping

valve

91,92,93, filtered liquid, phlegma, washings are injected container 67, with cover plate 80 sealings, close stopping

valve

91,92,93 then, power supply 66 is opened, water vapour well heater 68 begins heating, control the temperature of containers 67 air outlets at 78.2 ℃ by temperature control meter 65, alcohol gas enters condenser 69 by pipeline 86, and condensed liquid enters container 70 by pipeline 87, by cover plate 81 sealings, liquid in the container 70 promptly is ethanol, by pipeline 88, stopping valve 97 injects special container and stores, in order to utilizing again.

Open stopping valve 94, the surplus solution in the container 67 is injected strainer 71, by cover plate 82 sealings by pipeline 85, dense form filtering net 73 is arranged in the strainer 71, close stopping valve 94, open vacuum pump 72, carry out vacuum filtration, under the suction filtration of vacuum pump 72, will form filter cake 98 on the filter screen 73, suction filtration liquid all enters the bottom of strainer 71, after suction filtration is finished, closes vacuum pump 72, open cover plate 82, take out filter cake 98, place special container, filter cake 98 promptly is an oxine.

Oxine filter cake 98 is put into drying baker 100 oven dry together with container, and bake out temperature is 50 ℃, and the time is 4 hours, promptly is the oxine crystal after the oven dry.

Open stopping valve 95, the oil pump 75 on strainer 71 the right, suction filtration liquid is entered in the container 74 by

pipeline

89,90, close stopping valve 95, oil pump 75 then, liquid in the container 74 promptly is unreacted liquor alumini chloridi, open stopping valve 96, place special container to store liquor alumini chloridi, in order to utilizing.

Reclaim the equipment that uses in the technology and can use equipment among the preparation technology, also can carry out respectively, after preparation technology finishes, can reclaim technology continuously, but save energy like this, recovery extraction and application rate height.

When distillation purification oxine aluminium, oxine aluminium needs very high temperature when becoming gaseous state by solid-state, adopting common distillation to purify is difficult to realize, when oxine aluminium when entering distiller after a spot of water mixes, water vapour has also entered in the distiller simultaneously, when the pressure in the distiller reaches 1 normal atmosphere, the mixing solutions boiling, oxine aluminium is when the temperature that is lower than 100 ℃, just can become gas and enter condenser, oven dry can obtain highly purified oxine aluminium after the condensation, and this distillation purifying technique is crucial.

This patent is to adopt the organic solvent of ethanol as oxine aluminium, and abandons using methyl alcohol commonly used as organic solvent, and its contrast is as follows:

Ethanol: nontoxic, to the solubleness height of oxine, be 79.04 grams per liters, cost is low, and the boiling point height is 78.2 ℃, can make range of reaction temperature improve 10 ℃, to the concentration height of reaction soln, is 80 grams per liters.

Methyl alcohol: poisonous, eyes there is stimulation, low to the solubleness of oxine, be 57.27 grams per liters, the cost height, boiling point is low, is 68.5 ℃, and is low to the concentration of reaction soln, is 60 grams per liters.

By above contrast, ethanol is made organic solvent than superior many of methyl alcohol.

The choke principle of chemical reaction of quinoline aluminium of preparation 8-hydroxyl is:

The choke organic solution of quinoline and the solution of aluminum chloride of 8-hydroxyl makes aforesaid chemical equation at a certain temperature:

The essence of reaction is: oxine and AL ³⁺During coordination, AL ³⁺The H that replaces "---OH " ⁺, the N atom utilizes its lone-pair electron and AL then ³⁺It is the metal of the five-ring hexa-coordinate at center that coordination generates with the aluminum ion Compound, this reaction are the coordination balanced reactions.

Shown in the state 5,, can improve rapidly at the front of certain hour productive rate because its chemical reaction is the coordination balanced reaction, but the productive rate rate of growth can reduce after arriving this time, approximate constant, this time is exactly optimum reacting time, so certain productive rate relation is arranged between reaction times and the productive rate, x is the productive rate index, h is the reaction times, and by test, optimum reacting time is about 3 hours, this moment, the productive rate index can rise between the 60-80% rapidly, and kept stable.

The chemical substance proportioning weight part of preparation oxine aluminium is to make in a scope of giving the preparation quantity of determining earlier, generally is that product is produced proportioning unit with the kilogram.

Each reaction vessel that uses in the preparation, storage vessel, strainer, condenser, by net, pipeline, keep clean, be made as good with stainless material.

Claims

1, a kind of preparation method of organic electro luminous material 8-hydroxy quinoline aluminium is characterized in that being formed by following combination of chemicals reaction, and the proportioning of its chemical substance is: be the product unit of producing with the kilogram

Oxine crystal: 1048-1058 weight part

Aluminum chloride: 318-328 weight part

Ethanol: 10233-10533 weight part

Distilled water: 1200-1220 weight part

Preparation technology's flow process is as follows:

1) selected raw material

To carry out selectedly to the required raw material oxine crystal of proportioning, aluminum chloride, ethanol, distilled water, guarantee that its purity is more than 99%;

2) obtaining liq

By optimum weight part proportioning oxine crystal, ethanol are mixed in container, soak, dissolve, make solution, concentration is the 70-80 grams per liter;

By optimum weight part proportioning aluminum chloride, distilled water are mixed in container, soak, dissolve, make solution, concentration is the 2-3 mol.

3) mixing solutions

With the solution that oxine crystal, ethanol are made, the solution made from aluminum chloride, distilled water mixes in reaction vessel, and the mol ratio of oxine and aluminum chloride is 3: 1;

Add a small amount of organic bases triethylamine, the control acidity-basicity ph value is at 6-7 unit;

4) heating, constant temperature, stirring, reaction

To the reaction vessel heating of mixing solutions be housed, with control of temperature control meter and steady temperature, its temperature is controlled at 70 ℃-80 ℃, stirs with agitator simultaneously, makes it carry out chemical reaction;

Chemical equation is as follows:

In the formula: the OH-hydroxyl

N-nitrogen

ALCL ₃-aluminum chloride

O-oxygen

AL-aluminium

3HCL-hydrochloric acid

5) filter

After chemical reaction is finished, carry out solution filtration, vacuum filtration with fine and close filtering net, the yellow mercury oxide filtering separation is come out, become filter cake, yellow mercury oxide is oxine aluminium, and filtered liquid is collected storage, in order to recycling;

6) washing, vacuum filtration

With the oxine aluminium that filters to isolate, wash respectively and vacuum filtration with ethanol and distilled water, and circulation carries out 2-3 time, vacuum filtration carries out in the strainer of special use, and solution behind the suction filtration is collected and is stored, in order to recycling;

7) oven dry

Oxine aluminium behind washing, the vacuum filtration is placed container, and put into the drying baker oven dry, bake out temperature is 70 ℃, and the time is 2 hours;

8) distillation is purified

Oxine aluminium after the oven dry is purified with steam distillation equipment, and repeats to distill twice, makes oxine aluminium by the solid-state gaseous state that becomes, make the oxine aluminium of gaseous state shape steam, place condenser, carry out condensation process, condensed solid matter is oxine aluminium;

9) secondary drying

To the oxine aluminium after the distillation purification, secondary enters the drying baker oven dry, and bake out temperature is 70 ℃, and the time is 4 hours, and the solid state chemistry material behind the secondary drying is oxine aluminium powder foam;

10) check, test

To the oxine aluminium powder foam that extracts, check, test its purity, color and luster, form, performance with instrumentation, and carry out chemical analysis;

11) packing, storage

2, the preparation method of organic electro luminous material 8-hydroxy quinoline aluminium according to claim 1 is characterized in that: the best proportioning of chemical substance is: be the product unit of producing with the kilogram

Oxine crystal: 1053 weight parts

Aluminum chloride: 323 weight parts

Ethanol: 10383 weight parts

Distilled water: 1210 weight parts

3, the preparation method of organic electro luminous material 8-hydroxy quinoline aluminium according to claim 1 is characterized in that reclaiming technical process and is:

1) collects solution

Filtration among the preparation technology, vacuum filtration, washing, condensed solution are collected, are stored in the container separately;

2) mixing solutions

The various solution of collecting are all placed reaction vessel, and stir, mix;

3) heating fractionation, recovery ethanol

Mixing solutions is heated to 78.2 ℃ in reaction vessel, makes its fractionation, the fraction in the time of 78.2 ℃ is an alcohol gas, and alcohol gas becomes ethanol liquid after by condenser condenses, and ethanol promptly obtains reclaiming;

4) vacuum filtration reclaims oxine

Residual solution after the fractionation is put into strainer, carry out vacuum filtration, obtain filter cake on filter screen, filter cake is exactly a unreacted oxine completely, gets final product after the oven dry;

5) collect suction filtration liquid, reclaim aluminum chloride

Solution behind the vacuum filtration is collected in the special container, and this suction filtration liquid promptly is unreacted liquor alumini chloridi;

6) store, utilize