PROCESS FOR CONVERSION OF RESIDUE EMPLOYING DE-ASPHALTING AND DELAYED COKING
First Claim
1. An integrated coking and solvent de-asphalting process, the process comprising:
- (a) introducing a feedstock [1] near to bottom of a fractionator column [2] to obtain a mixed feed [3] drawn out from the bottom of the fractionator column;
(b) contacting the mixed feed [3] with a solvent [5] in a extractor [4] to obtain a pitch stream [6] containing asphaltenic fraction and predominantly a paraffinic stream [10] containing a de-asphalted oil and the solvent;
(c) passing the pitch stream [6] to a pitch solvent stripper [7] to obtain a residual pitch stream [8] and the solvent;
(d) heating the residual pitch stream [8] in a furnace [16] to a coking temperature to obtain a hot pitch stream [17];
(e) transferring the hot pitch stream [17] to one of a plurality of coke drums [18, 19] where it undergoes thermal cracking reaction to obtain hydrocarbon vapours [20] and coke;
(f) passing the hydrocarbon vapours [20] to the fractionator column [2] to obtain product fraction.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to resid processing, particularly related to conversion of resid material with maximum recovery of lighter hydrocarbons. The invented process utilizes a novel scheme for integration of solvent de-asphalting and delayed coking processes to maximize the residue conversion to valuable products, with cleaner quality of middle distillates and fuel oil products, in comparison with other integrated solvent de-asphalting and delayed coking schemes. This process also has an additional flexibility to vary the recycle quantity, without impacting fractionator operation of the delayed coking section, which further enhances the product recovery and achieves maximum conversion of the resid feedstock, with minimum impact on liquid product properties.
7 Citations
16 Claims
-
1. An integrated coking and solvent de-asphalting process, the process comprising:
-
(a) introducing a feedstock [1] near to bottom of a fractionator column [2] to obtain a mixed feed [3] drawn out from the bottom of the fractionator column; (b) contacting the mixed feed [3] with a solvent [5] in a extractor [4] to obtain a pitch stream [6] containing asphaltenic fraction and predominantly a paraffinic stream [10] containing a de-asphalted oil and the solvent; (c) passing the pitch stream [6] to a pitch solvent stripper [7] to obtain a residual pitch stream [8] and the solvent; (d) heating the residual pitch stream [8] in a furnace [16] to a coking temperature to obtain a hot pitch stream [17]; (e) transferring the hot pitch stream [17] to one of a plurality of coke drums [18, 19] where it undergoes thermal cracking reaction to obtain hydrocarbon vapours [20] and coke; (f) passing the hydrocarbon vapours [20] to the fractionator column [2] to obtain product fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification