Combined process of low degree solvent deasphalting and delayed coking
AssigneesChina Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
InventorsRui Li, Zijun Wang, Jun Long
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Abstract
A combined process of low degree solvent deasphalting and delayed coking, which comprises feeding a deasphalting stock and a solvent into an extractor and making the yield of the deasphalted oil 70 wt %-95 wt %, and introducing a part or all of the deasphalted oil and optionally a conventional coking stock into a delayed coker. This process increases the yield of liquid products, removes the heavy asphaltene which is prone to coke, extends the run length of the delayed coker, and at the same time, lowers the content of impurities in coke, enlarges the sources of the stocks for producing the needle coke.
Claims16
A multi-step process for treating hydrocarbon oil by a combined process of low degree solvent deasphalting and delayed coking, which comprises the following steps:
- (1) A preheated deasphalting stock and a solvent enter into an extractor, and a solvent-containing deoiled asphalt solution is withdrawn from the bottom of the extractor;
- the deasphalted oil solution from the top of the extractor yields the deasphalted oil after recovering the solvent;
- the yield of the deasphalted oil is 70 wt %-95 wt % relative to the deasphalting stock;
- and
- (2) A part or all of the deasphalted oil and a coker recycle oil from a fractionator, and optionally another conventional coking stock enter into the convection section of the furnace of the delayed coker for heating, then enter into the radiant section of the furnace for heating, and finally enter into a coker drum to conduct the coking reaction;
- coke remains in the coker drum, and coker oil and vapor escape from the top of the coker drum and enter into the fractionator, wherein they are separated into gas, gasoline, diesel, and gas oil;
- the coker recycle oil is mixed with the deasphalted oil and the mixture enters into the convection section of the furnace of the delayed coker.
A multi-step process for treating hydrocarbon oil by a combined process of low degree solvent deasphalting and delayed coking, which comprises the following steps:
- (1) A preheated deasphalting stock and a solvent enter into an extractor, and a solvent-containing deoiled asphalt solution is withdrawn from the bottom of the extractor;
- the deasphalted oil solution from the top of the extractor yields the deasphalted oil after recovering the solvent;
- the yield of the deasphalted oil is 70 wt %-95 wt % relative to the deasphalting stock;
- (2) A part or all of the deasphalted oil and coker recycle oil enter into the furnace of a mild thermal converter, and the light components obtained by separation of the heated stream enter into the fractionator of the delayed coker while the heavy components enter into the furnace of the delayed coker;
- and
- (3) The heavy components subjected to the mild thermal reaction and optionally another stock for the needle coke enter into the furnace of the delayed coker for heating and then enter into the coker drum for coking reaction;
- coker oil and vapor escape from the top of the coker drum and enter into the fractionator, wherein they are separated into gas, gasoline, diesel, and gas oil;
- the coker recycle oil is mixed with the deasphalted oil and the mixture enters into the furnace of the mild thermal converter, and the needle coke remains in the coker drum.
Dependencies are inferred from the claim text.