CN106753545A - A kind of process of coal tar processing modification - Google Patents
A kind of process of coal tar processing modification Download PDFInfo
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- CN106753545A CN106753545A CN201611121955.8A CN201611121955A CN106753545A CN 106753545 A CN106753545 A CN 106753545A CN 201611121955 A CN201611121955 A CN 201611121955A CN 106753545 A CN106753545 A CN 106753545A
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- tar
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
- C10G53/04—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one extraction step
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- Oil, Petroleum & Natural Gas (AREA)
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Abstract
A kind of process of coal tar processing modification, it is characterised in that comprise the following steps：（1）By raw tar and mixed solvent A according to mass ratio 1：（1‑3）Mixing, 40 75 DEG C of extraction temperature is extracted, and obtains slag inclusion tar with net tar phase；（2）Flash distillation is mutually carried out to slag inclusion tar and goes agent, obtain cinder pitch；（3）Net tar phase is with mixed solvent B according to mass ratio 1：（0.5‑2）Mixing, 30 70 DEG C of extraction temperature is extracted, and obtains extraction phase and raffinate phase；（4）Raffinate phase is through flash distillation removal solvent orange 2 A, then a small amount of solvent B wherein contained through washing removal, obtains the non-aromatic hydrocarbon ils rich in fat hydrocarbon component；（5）After extraction phase goes agent through distillation, the refined maltha of the oily and low quinoline insolubles of aromatic rich cut is obtained.The advantage of the invention is that：Realize the purpose of focusing oil level modification.Aromatic component is more enriched with making the rich aromatic naphtha of gained, and rich aromatic naphtha is the good raw material for further extracting fine chemical product.
Description
Technical field
The present invention relates to a kind of process of coal tar processing modification, it is adaptable to the work of middle coalite tar processing and utilization
Process.
Background technology
Coal tar is the liquid by-product of generation during the dry distillation of coal, due to its difference of mode of originating, causes coal tar
Composition is complex, except containing aliphatic hydrocarbon, outside the heterocyclic compound of aromatic hydrocarbon and part S, N, O, also exists substantial amounts of
Moisture, ash content, mechanical admixture and highly polar compound.At present, coal tar modification is main based on hydrogenation mode.But coal tar adds
Hydrogen modification is not the mode of effective and reasonable utilization tar.Reason is, most aromatic compounds and some jeterocyclic chemistries in tar
Compound is plastics, synthetic rubber, the raw material of the fine chemical product such as medicine, extremely valuable.The 3 cyclophane hydrocarbonylations such as particularly anthracene, acenaphthene
Compound, 90% comes from coal tar, and hydrogenation can cause to waste.On the other hand, hydrogenation of tar, process conditions are harsh, and energy consumption is also larger,
In addition still need to pre-process raw material before being hydrogenated with, raw material availability is low.Based on above-mentioned consideration, for tar characteristics, carry out non-
Hydro-upgrading treatment is significant for rationally utilizing tar.
It is most of to use a tower or two-tower type distillation technique for the non-hydrogenation modifying process of coal tar tar, will
Tar is first simply cut into light oil distillate (less than 170 DEG C), carbolic oil cut (170 DEG C -210 DEG C), how oil distillate (210 DEG C -
230 DEG C), wash oil fraction (230 DEG C -300 DEG C), carbolineum cut (300 DEG C -360 DEG C) and pitch are carried out finely to each cut afterwards
The extraction of chemicals, its recovery rate is relatively low and not on a large scale.
CN102492451A discloses a kind of separation method of tar, and multistage extraction is carried out to tar by selecting different solvents
Take, realize the separation of tar weight component, main aromatic compound and part heterocyclic compound containing 1-4 rings in light component.
Because substantially based on aromatic compound, aliphatic hydrocarbon is few in high temperature coal-tar, therefore for high temperature tar extract and separate,
This separation method is effective.And there is a certain amount of aliphatic hydrocarbon component in middle coalite tar, only simply realize that tar is light
The separation of heavy constituent, can not make fragrant cyclics in tar reach effectively enrichment, and aliphatic hydrocarbon component in tar is also needed
Further separate.
The content of the invention
It is an object of the invention to provide a kind of process of coal tar processing modification, by selecting suitable solvent,
Coal tar is extracted, the separation of coal tar tar weight component is not only realized, and makes aromatic component and non-aromatics in tar
Component carries out each self enrichment, so as to realize the purpose of focusing oil level modification, most coal tar is separated into non-aromatic hydrocarbon ils, Fu Fang at last
Hydrocarbon ils, coal tar maltha, four products of cinder pitch.
The present invention is achieved by the following technical solutions：
A kind of process of coal tar processing modification, it is characterised in that comprise the following steps：
(1) by raw tar and mixed solvent A according to mass ratio 1：(1-3) mixes, and 40-75 DEG C of extraction temperature is extracted
Take, obtain slag inclusion tar with net tar phase；
(2) flash distillation is mutually carried out to slag inclusion tar and goes agent, obtain cinder pitch；
(3) net tar phase and mixed solvent B are according to mass ratio 1：(0.5-2) mixes, and 30-70 DEG C of extraction temperature is extracted
Take, obtain extraction phase and raffinate phase；
(4) raffinate phase is through flash distillation removal solvent orange 2 A, then a small amount of solvent B wherein contained through washing removal, obtains rich in fat
The non-aromatic hydrocarbon ils of hydrocarbon component；
(5) after extraction phase goes agent through distillation, the refined maltha of the oily and low quinoline insolubles of aromatic rich cut is obtained.
Wherein, raw tar includes the coal tar produced by low temperature distillation in coal, and the Mixture Density Networks that various ways are obtained
Tar.
Wherein, mixed solvent A used is made up of a kind of aliphatic solvent and a kind of aromatic hydrocarbon solvent, and its quality group turns into 1：
(0.3-1)。
Wherein, a kind of aliphatic hydrocarbon hydrocarbon solvent is one or more in petroleum ether, normal heptane, naphtha；A kind of aromatic hydrocarbon
Solvent is one or more in benzene,toluene,xylene, ethylbenzene, coal tar wash oil fraction.
Wherein, described mixed solvent B is made up of a kind of Aromatics Extractive Project agent and a kind of solvent with higher hydrogen bonding force, its
Quality group turns into 1:(0.05-0.1).
Wherein, it is a kind of with higher hydrogen bonding force solvent be water, ethylene glycol in one kind, a kind of Aromatics Extractive Project agent be DMF,
One kind in DMSO, NMP.
Compared with prior art, the advantage of the invention is that：For tar characteristics, realized under gentle process conditions
Weight component in tar, aliphatic hydrocarbon is individually separated with aromatic component, realizes the purpose of focusing oil level modification.On the one hand
Non-aromatic hydrocarbon ils based on aliphatic hydrocarbon can make good cracked stock and use, simultaneously because in tar aliphatic hydrocarbon component removal,
Aromatic component is more enriched with making the rich aromatic naphtha of gained, and rich aromatic naphtha is the good raw material for further extracting fine chemical product.
On the other hand, in tar part heavy component and impurity removing, not only make gained coal tar maltha quinoline insolubles content
Significantly reduce, and the cinder pitch for obtaining can also be developed further, such as prepare activated carbon.Additionally, the art inventions
Another advantage is that raw tar obtains net tar phase after being extracted through solvent orange 2 A, using aliphatic solvent in solvent orange 2 A compared with indissoluble
The characteristics of solvent B, it is not necessary to distillation is mutually carried out to net tar and removes solvent, it is directly added into net tar phase under solvent B carries out
One step is extracted, and simplifies aliphatic solvent process in technological process and A molten for recovery, energy consumption reduction.
Brief description of the drawings
Fig. 1 is a kind of process flow diagram of the process of coal tar processing modification of the invention.
In figure：1.-dehydration；2.-extraction；3.-flash distillation；4.-distillation；5.-washing.
Specific embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
It is 0.3 according to mass ratio by toluene and normal heptane with coalite tar A as raw material (property is shown in Table 1):1 composition
Solvent orange 2 A, 1 is compared by oil sample A and solvent orange 2 A according to finish:1 (mass ratio) loads extractor, and 40 DEG C of extraction temperature stirs 15min, quiet
2h is put, slag inclusion tar phase and net tar phase, two-phase laminated flow is obtained.After slag inclusion tar is through flash distillation removal solvent orange 2 A, 16.4% is obtained
Cinder pitch.It is 1 to constitute mass ratio by DMF and water:0.05 solvent B, 1 is compared by net tar and solvent B according to finish:0.5 (matter
Amount ratio) directly mix, 30 DEG C of extraction temperature, 20min is stirred, 2h is stood, raffinate phase and extraction phase are obtained, two-phase laminated flow.Raffinate phase
In contain a large amount of normal heptanes and a small amount of DMF solvent, through washing after flash distillation, obtain 21.2% non-aromatic hydrocarbon ils (saturation point
81.32%.Fragrance point 6.98%, colloid 8.91%, asphalitine 2.79%).Extraction phase obtains solvent successively through distillation,
32.2% less than 360 DEG C of aromatic rich cut oil (saturation point 7.43%, fragrance point 81.67%, colloid 10.01%, asphalitine
0.89%) coal tar maltha with 30.2% (quinoline insolubles content is 0.42%).
Embodiment 2
With coalite tar A as raw material (property is shown in Table 1), pressed with petroleum ether by coal tar washing oil (230 DEG C of -300 DEG C of cuts)
It is 0.5 according to mass ratio:The solvent orange 2 A of 1 composition, 1 is compared by oil sample A and solvent orange 2 A according to quality finish:2 load extractor, extraction temperature
60 DEG C, 15min is stirred, stand 2h, obtain slag inclusion tar phase and net tar phase, two-phase laminated flow, slag inclusion tar is molten through flash distillation removal
After agent A, 17.8% cinder pitch is obtained.It is 1 to constitute mass ratio by NMP and ethylene glycol:0.08 solvent B, by net tar with
Solvent B compares 1 according to quality finish:1 mixing, 50 DEG C of extraction temperature stirs 20min, stands 2h, obtains raffinate phase and extraction phase, two
It is separated.Contain bulk petroleum ether and a small amount of nmp solvent in raffinate phase, through washing after flash distillation, obtain 19.1% non-aromatics
Oil (saturation point 83.00%.Fragrance point 3.94%, colloid 8.50%, asphalitine 4.56%).Extraction phase is obtained successively through distillation
Solvent, 35.4% less than 360 DEG C of aromatic rich cut oil (saturation point 8.04%, fragrance point 81.12%, colloid 10.40%, drip
Blue or green matter 0.44%) and 27.7% coal tar maltha (quinoline insolubles content 0.79%).
Embodiment 3
It is 1 according to mass ratio by toluene and naphtha with coalite tar B as raw material (property is shown in Table 1):1 composition it is molten
Agent A, 1 is compared by oil sample B and solvent orange 2 A according to finish:3 (mass ratioes) load extractor, and 75 DEG C of extraction temperature stirs 15min, stands
2h, obtains slag inclusion tar phase and net tar phase, two-phase laminated flow.After slag inclusion tar is through flash distillation removal solvent orange 2 A, 13.4% coal is obtained
Slag pitch.The solvent B constituted using DMSO and water, its mass ratio is 1:0.1, net tar and solvent B are compared 1 according to finish:2
(mass ratio) mixes, 70 DEG C of extraction temperature, stirs 20min, stands 2h, obtains raffinate phase and extraction phase, two-phase laminated flow.Raffinate phase dodges
Through washing after steaming, 21.9% non-aromatic hydrocarbon ils (saturation point 76.43% is obtained.Fragrance point 10.91%, colloid 9.87%, asphalitine
2.79%).Extraction phase obtains solvent successively through distillation, 35.3% less than 360 DEG C of aromatic rich cut oil (saturation point 3.79%,
Fragrance point 84.78%, colloid 11.01%, asphalitine 0.42%) and 29.4% coal tar maltha (quinoline insolubles content is
0.51%).
Table 1
Claims (6)
1. the process that a kind of coal tar processing is modified, it is characterised in that comprise the following steps：
（1）By raw tar and mixed solvent A according to mass ratio 1：（1-3）Mixing, 40-75 DEG C of extraction temperature is extracted, obtained
To slag inclusion tar and net tar phase；
（2）Flash distillation is mutually carried out to slag inclusion tar and goes agent, obtain cinder pitch；
（3）Net tar phase is with mixed solvent B according to mass ratio 1：（0.5-2）Mixing, 30-70 DEG C of extraction temperature is extracted, obtained
To extraction phase and raffinate phase；
（4）Raffinate phase is through flash distillation removal solvent orange 2 A, then a small amount of solvent B wherein contained through washing removal, obtains rich in fat hydrocarbon
The non-aromatic hydrocarbon ils of component；
（5）After extraction phase goes agent through distillation, the refined maltha of the oily and low quinoline insolubles of aromatic rich cut is obtained.
2. the process that a kind of coal tar processing according to claim 1 is modified, it is characterised in that raw tar bag
Include the coal tar produced by low temperature distillation in coal, and the mixed coal tar that various ways are obtained.
3. the process that a kind of coal tar processing according to claim 1 is modified, it is characterised in that mixing used is molten
Agent A is made up of a kind of aliphatic solvent and a kind of aromatic hydrocarbon solvent, and its quality group turns into 1：（0.3-1）.
4. a kind of process that a kind of coal tar processing according to claim 3 is modified, it is characterised in that aliphatic hydrocarbon hydrocarbon
Solvent is one or more in petroleum ether, normal heptane, naphtha；A kind of aromatic hydrocarbon solvent be benzene,toluene,xylene, ethylbenzene,
One or more in coal tar wash oil fraction.
5. the process that a kind of coal tar processing according to claim 1 is modified, it is characterised in that described mixing
Solvent B is made up of a kind of Aromatics Extractive Project agent and a kind of solvent with higher hydrogen bonding force, and its quality group turns into 1:（0.05-0.1）.
6. according to claim 5 a kind of coal tar processing modification process, it is characterised in that one kind have compared with
Hydrogen bond force solvent high is the one kind in water, ethylene glycol, and a kind of Aromatics Extractive Project agent is the one kind in DMF, DMSO, NMP.
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| CN201611121955.8A CN106753545A (en) | 2016-12-08 | 2016-12-08 | A kind of process of coal tar processing modification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107446606A (en) * | 2017-08-30 | 2017-12-08 | 西北大学 | The technique and device of a kind of coal tar production modified coal tar pitch, aliphatic hydrocarbon and aromatic hydrocarbon |
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| CN107446606A (en) * | 2017-08-30 | 2017-12-08 | 西北大学 | The technique and device of a kind of coal tar production modified coal tar pitch, aliphatic hydrocarbon and aromatic hydrocarbon |
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Application publication date: 20170531 |