Extraction of aromatics from hydrocarbon oil using n-methyl 2-pyrrolidone and co-solvent

a technology of hydrocarbon oil and aromatics, which is applied in the direction of hydrocarbon oil refining, petroleum industry, and refining with two or more solvents, etc., can solve the problems of increasing the raffinate yield of hydrocarbon oil on the addition of a co-solvent, and not disclosed, so as to achieve lower operating costs, higher raffinate yield, and lower cost of co-solvent use

Inactive Publication Date: 2010-09-30
INDIAN OIL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0060]The advantage of the present invention allows for retrofitting existing equipments. Another advantage of the present invention is use of solvent mixture comprising NMP and at least one co-solvent with water or without water which lowers operating cost as the cost of the co-solvent employed is lower than that of neat NMP. Another additional advantage of using solvent mixture is that it produces same quality raffinate as those of neat NMP-water measured by the refractive index but produces higher yield of raffinate at same feed to solvent mixture ratio. Yet another advantage of using solvent mixture is the flexibility in extraction of various feedstocks. It can be employed for lighter lube distillate namely, spindle oil extraction to heavier oil namely, deasphalted oil extraction.
[0061]The disclosure will now be illustrated with working examples, which is intended to illustrate the working of disclosure and not intended to take restrictively to imply any limitations on the scope of the present disclosure.

Problems solved by technology

However in this prior art, the increase in raffinate yield is not disclosed.
However, in both the prior arts, increase in the raffinate yield from hydrocarbon oil on the addition of a co-solvent is not disclosed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062]Liquid-liquid equilibrium (LLE) batch extraction was performed using NMP and water as the solvent mixture in lab scale jacketed glass extraction apparatus batch. The feed, Arab Mix Inter neutral (IN) distillate was preheated. 150 gm of feed, whose properties are given in Table 2, and 180 gm of solvent mixture were fed into the extraction apparatus. The temperature of the equilibrium setup is kept at 70° C. The feed and solvent were mixed well using a stirrer. The stirrer speed was kept constant throughout the 90 minutes of mixing time. After mixing the content, it was kept for 3 hours to settle i.e. allow complete phase separation. After the settling of phases, the extract and raffinate phases were separated accurately and collected separately. The raffinate and extract phases were weighed accurately with precision balance to ensure material balance. The solvent was stripped both from the extract and raffinate with nitrogen under vacuum. The stripped raffinate and extract phas...

example 2

[0063]The same experiment as in example 1 was performed with NMP, water and at least one co-solvent as the solvent mixture.

[0064]The comparative results from the Liquid-Liquid Equilibrium (LLE) studies on Inter neutral distillate of example 1 and example 2 are shown in the Table 3.

TABLE 3(Feed to Solvent mixture ratio is 1:1.2 w / w)Co-solventCompositionRaffinateSolvent system(wt %)Yield (wt %)RI @ 50° C.NMP + 1.5% Water064.71.49680NMP + Co-solvent +20661.496250.75% Water3068.61.49664

[0065]Commercially, lube extraction units are operated to a Refractive Index (RI) specification since for a particular lube crude and type of refining process, raffinate RI correlates with the viscosity index (VI) of the de-waxed oil (DWO), with lower RI corresponding to higher VI.

[0066]Analysis of the data in Table 3 shows that for extraction conducted at feed to solvent mixture weight ratio of 1:1.2, the NMP, water and 30 wt % co-solvent mixture was more effective than NMP and water alone, resulting in ...

example 3

[0067]LLE extraction was performed in batch extraction apparatus using NMP and water as the solvent mixture. The feed, Arab Mix Heavy Neutral (HN) distillate, properties of which are shown in Table 4, was preheated. 150 gm of feed and 225 gm of solvent mixture were fed in to the extraction setup. The temperature of the content was kept at 80° C. The feed and solvent were mixed with the help of a stirrer. The stirrer speed was kept constant throughout the 90 minutes of mixing period. After mixing, the content was kept for 3 hours to allow complete settling. After the settling of phases, the extract and raffinate phase were collected separately. The raffinate and the extract phase were weighed accurately with precision balance to ensure material balance. The solvent was stripped from the extract and raffinate with nitrogen purging under vacuum. The stripped raffinate and extract phases were weighed and the raffinate yield was determined. Final raffinate samples were analyzed for refra...

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Abstract

The present invention provides a process for extraction of aromatic material from hydrocarbon oil by using a solvent mixture comprising N-Methyl-2-Pyrrolidone (NMP), at least one co-solvent and optionally water, to obtain a raffinate. The process of the present invention lowers operating cost as the cost of the co-solvent employed is lower than that of neat NMP. Another feature of the present invention is that it produces the same quality raffinate as those of neat NMP-water measured by the refractive index but produces higher yield of raffinate at same feed to solvent mixture ratio.

Description

[0001]This application claims priority benefit from Indian Provisional Application No. 584 / DEL / 2009, filed on Mar. 25, 2009, the entire content of which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a process for extraction of aromatic material from hydrocarbon oil by addition of a solvent mixture comprising N-Methyl-2-Pyrrolidone (NMP), at least one co-solvent and optionally water, to obtain a raffinate.[0003]The raffinate obtained by the process of the present invention is of a higher yield than that obtained by conventional process at the same solvent mixture to feed ratio. The raffinate obtained also maintains the same quality as those obtained by process using neat NMP-water which is measured by the refractive index.BACKGROUND OF THE INVENTION[0004]Solvent extraction process is a process employed for the removal of constituents that would have an adverse effect on the performance of the product in use. In petrol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G21/20
CPCC10G21/02C10G21/20C10G21/16
Inventor RAMAN, N. S.MOHANASUNDARAM, P.DEVOTTA, I.SINGHAL, S. K.BASU, B.
Owner INDIAN OIL CORPORATION
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