CN102453548B - Solvent dewaxing method by use of dewaxing assistant - Google Patents
Solvent dewaxing method by use of dewaxing assistant Download PDFInfo
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- CN102453548B CN102453548B CN201010513732.2A CN201010513732A CN102453548B CN 102453548 B CN102453548 B CN 102453548B CN 201010513732 A CN201010513732 A CN 201010513732A CN 102453548 B CN102453548 B CN 102453548B
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Abstract
The invention discloses a solvent dewaxing method by the use of a dewaxing assistant, comprising the following steps of: mixing molten dewaxing materials and a dewaxing assistant, adding a dewaxing solvent, and cooling to a dewaxing temperature. The addition mode of the solvent is a multipoint dilution method or a one-time full dilution method. Dewaxing oil and dewaxing cerate can be obtained by filtration and separation at the dewaxing temperature. The dewaxing assistant is Fischer-Tropsch synthetic wax with high-melting point. According to the invention, the filtration speed and the dewaxing oil yield are raised, and simultaneously the applied assistant needs not to be separated from wax and generates no unfavorable impact on wax properties.
Description
Technical field
The present invention relates to a kind of method of lubricating oil solvent dewaxing, particularly make used additives be lubricated the method for Oil solvent dewaxing.The inventive method is applicable to the solvent dewaxing of vacuum distillate, the solvent dewaxing of the heavy distillate that is particularly useful for reducing pressure, and the said decompression heavy distillate of the present invention comprises and subtracts four line distillates and the frivolous asphalt oil of vacuum residuum.
Background technology
The dewaxing of lubricating oil mainly contains two kinds of solvent dewaxing and catalytic dewaxings, and conventional solvent-dewaxing method is to add solvent cut in dewaxing raw material, is cooled to low temperature wax crystallization is separated out, then make after filtration oily wax separate.
In waxy petroleum distillate, contained petroleum wax is mainly normal paraffin and the isoparaffin of long-chain, and along with the rising of boiling point, isoparaffin content increases.When normal paraffin is separated out in solvent, can form large intact crystal, and isoparaffin can not form the perfect crystal of any size when crystallization from solvent.
In lubricating oil solvent dewaxing, particularly reduce pressure in heavy distillate solvent dewaxing process, isoparaffin forms tiny crystallization increases filtration velocity reduction, filter cake oil-containing, thereby affects the treatment capacity of yield dewaxed oil and production equipment.
The effect of dewaxing agent takes the lead in forming well-crystallized's " crystal seed " in waxy oil process of cooling, by effects such as nucleation, absorption, eutectics, makes wax form the crystallization that size is even, discreteness is good, improves filtration velocity and yield dewaxed oil.
CN1865407A discloses a kind of method that uses dewaxing agent to be lubricated Oil solvent dewaxing, and the method is used the mixture of olefin polymer and alcohol base polymer as dewaxing agent, can improve filtration velocity and yield dewaxed oil.But the oxygen molecule in auxiliary agent and two key are sneaked in wax, bring disadvantageous effect to the stability of wax, must remove and just can be applied to some strict wax Application Areas, will be a more difficult technological process and auxiliary agent is separated with wax.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of solvent-dewaxing method that makes used additives, in improving filtration velocity and yield dewaxed oil, the auxiliary agent of use does not need separate with wax and the character of wax do not had a negative impact.
The present invention uses the solvent-dewaxing method of dewaxing agent to comprise following content: the dewaxing raw material of melting and dewaxing agent are mixed, then add dewaxing solvent and be cooled to dewaxing temperature, the mode that adds of solvent can adopt multipoint dilution method, or adopt once full dilution process, under dewaxing temperature, filtering separation can obtain pressed oil and dewaxing slack wax.
Said dewaxing agent is a kind of high-melting-point Fischer-Tropsch synthetic wax, for any cut that Fischer-Tropsch synthetic wax is greater than 530 DEG C, carbonatoms is 40～100, and molecular weight is 560～1350, to add the weight percentage that dewaxing agent accounts for dewaxing raw material be 0.02%～5%, preferably 0.05%～2%.
Said dewaxing raw material is generally vacuum distillate, comprises Light lube oil, subtracts three line distillates, subtracts four line distillates and the frivolous pitch wet goods of vacuum residuum.
Said solvent can be C
3～C
6aliphatic ketone or its mixture, ketone and C
6～C
8the mixture of aromatic hydrocarbon.More applicable solvent is methylethylketone, methyl iso-butyl ketone (MIBK), methylethylketone/methyl iso-butyl ketone (MIBK) and methylethylketone/toluene.The solvent of recommending is the mixture of methylethylketone and toluene.Normally 40wt%～90wt% of the content of ketone in methylethylketone/toluene Mixed Solvent, more suitable ratio is 60wt%～85wt%.Other operating process and the condition of solvent dewaxing are well known to those skilled in the art.As the consumption of solvent, the temperature of dewaxing etc., according to the dewaxing character of raw material and the kind of solvent etc., by those skilled in the art's optimization design in existing scheme, the weight ratio of the general total consumption of fresh solvent and waxy feeds oil is 2: 1～10: 1, be preferably 3: 1～6: 1, dewaxing temperature is-30～0 DEG C.
According to the method for the invention, can obviously improve the filtration velocity of solvent dewaxing, and greatly improve yield dewaxed oil, oily wax good separating effect.Because dewaxing agent has the molecular structure similar to petroleum wax and the imperfect composition such as sulfur-bearing, nitrogen, oxygen and alkene not, therefore do not need auxiliary agent to separate with wax, the auxiliary agent of staying in wax has no adverse effect to the character of wax.The dewaxing agent that the present invention uses in fact also belongs to the one of wax, and the dewaxing agent taking wax as solvent dewaxing process, is that art technology cannot be contemplated to.
Embodiment
The dewaxing feedstock property that the embodiment of the present invention and comparative example adopt is in table 1.
The dewaxing solvent that the embodiment of the present invention and comparative example adopt is methylethylketone-toluene Mixed Solvent, the each embodiment of group of solvents prejudice and comparative example.
The solvent cut of the embodiment of the present invention and comparative example solvent dewaxing process adopts 4 dilutions, and dilution point is 75 DEG C, 35 DEG C ,-10 DEG C and-20 DEG C.
The auxiliary agent that the embodiment of the present invention adopts is:
Auxiliary agent 1: 590～700 DEG C of cuts of Fischer-Tropsch synthetic wax, molecular-weight average 735,98 DEG C of dropping points.
Auxiliary agent 2: 700 DEG C of cuts of > of Fischer-Tropsch synthetic wax, molecular-weight average 990,108 DEG C of dropping points.
The operational condition of the embodiment of the present invention and comparative example solvent dewaxing and the results are shown in Table 2～5.
Table 1 feedstock property that dewaxes
Table 2 Light lube oil solvent dewaxing condition and result
Table 3 subtracts three line distillate solvent dewaxing condition and results
Table 4 subtracts four line distillate solvent dewaxing condition and results
Table 5 frivolous asphalt oil solvent dewaxing condition and result
Claims (9)
1. one kind uses the solvent-dewaxing method of dewaxing agent, the dewaxing raw material of melting and dewaxing agent are mixed, then add dewaxing solvent and be cooled to dewaxing temperature, the mode that adds of solvent adopts multipoint dilution method, or adopt once full dilution process, under dewaxing temperature, filtering separation can obtain pressed oil and dewaxing slack wax; It is characterized in that: said dewaxing agent is high-melting-point Fischer-Tropsch synthetic wax; High-melting-point Fischer-Tropsch synthetic wax is any cut that Fischer-Tropsch synthetic wax is greater than 530 DEG C.
2. in accordance with the method for claim 1, it is characterized in that: the carbonatoms of high-melting-point Fischer-Tropsch synthetic wax is 40～100, molecular weight is 560～1350.
3. it is characterized in that in accordance with the method for claim 1: dewaxing agent accounts for 0.02%～5% of dewaxing raw material weight.
4. it is characterized in that in accordance with the method for claim 3: dewaxing agent accounts for 0.05%～2% of dewaxing raw material weight.
5. it is characterized in that in accordance with the method for claim 1: dewaxing raw material is Light lube oil, subtracts three line distillates, subtracts four line distillates or the frivolous asphalt oil of vacuum residuum.
6. it is characterized in that in accordance with the method for claim 1: solvent is C
3～C
6aliphatic ketone or its mixture, or ketone and C
6～C
8the mixture of aromatic hydrocarbon.
7. according to the method described in claim 1 or 6, it is characterized in that: solvent is methylethylketone, methyl iso-butyl ketone (MIBK), methylethylketone/methyl iso-butyl ketone (MIBK) or methylethylketone/toluene.
8. it is characterized in that in accordance with the method for claim 1: the total consumption of solvent is 2: 1～10: 1 with the weight ratio of dewaxing raw material.
9. it is characterized in that in accordance with the method for claim 1: dewaxing temperature is-30～0 DEG C.
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| CN201010513732.2A CN102453548B (en) | 2010-10-14 | 2010-10-14 | Solvent dewaxing method by use of dewaxing assistant |
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| CN201010513732.2A CN102453548B (en) | 2010-10-14 | 2010-10-14 | Solvent dewaxing method by use of dewaxing assistant |
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| CN102453548A CN102453548A (en) | 2012-05-16 |
| CN102453548B true CN102453548B (en) | 2014-07-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103725319B (en) * | 2012-10-16 | 2015-09-23 | 中国石油化工股份有限公司 | A kind of production method of aromatic hydrocarbon rubber extender oil |
| CN103789039B (en) * | 2012-11-05 | 2016-03-30 | 中国石油化工股份有限公司 | A kind of solvent-dewaxing method |
| CN104109559B (en) * | 2013-10-21 | 2016-04-13 | 中国石油化工股份有限公司 | A kind of preparation method of the long-chain low melt wax for the production of non-short chain clorafin |
| CN105754651B (en) * | 2014-12-16 | 2017-07-07 | 中国石油天然气集团公司 | A kind of solvent for ketone-benzol dewaxing process dilutes and cold wash method |
| CN108949231A (en) * | 2018-08-13 | 2018-12-07 | 武汉轻工大学 | The method of leaching method raising Fischer-Tropsch wax fusion temperature |
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|---|---|---|---|---|
| US3458430A (en) * | 1967-05-15 | 1969-07-29 | Exxon Research Engineering Co | Separation of hydrocarbon wax from mineral oil using dewaxing aids |
| US3576735A (en) * | 1969-10-29 | 1971-04-27 | Gulf Research Development Co | Paraffinic slack wax as a dewaxing aid for lubricating oils |
| US4354003A (en) * | 1978-07-21 | 1982-10-12 | Toa Nenryo Kogyo Kabushiki Kaisha | Solvent dewaxing waxy hydrocarbons using an α-olefin polymer-olefin vinyl acetate copolymer composite dewaxing aid |
| US4728414A (en) * | 1986-11-21 | 1988-03-01 | Exxon Research And Engineering Company | Solvent dewaxing using combination poly (n-C24) alkylmethacrylate-poly (C8 -C20 alkyl (meth-) acrylate dewaxing aid |
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| KR100684096B1 (en) * | 1999-05-10 | 2007-02-20 | 도요 고한 가부시키가이샤 | Methods for constructing dna library and support carrying dna library immobilized thereon |
| IT1313827B1 (en) * | 1999-10-27 | 2002-09-23 | Lagostina Spa | LID FOR PRESSURE COOKING CONTAINER |
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| US3458430A (en) * | 1967-05-15 | 1969-07-29 | Exxon Research Engineering Co | Separation of hydrocarbon wax from mineral oil using dewaxing aids |
| US3576735A (en) * | 1969-10-29 | 1971-04-27 | Gulf Research Development Co | Paraffinic slack wax as a dewaxing aid for lubricating oils |
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