Process for the disposal of aqueous sulfur and caustic-containing wastes
First Claim
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1. A coking process which may be used for the disposal of an aqueous waste material, comprising the following steps:
- (a) reacting a coker feedstock under coking reaction conditions in the presence of an aqueous waste material, wherein the waste material is a caustic soda, caustic potash, or a mixture of both resulting from the refining of heavy hydrocarbons to lighter hydrocarbon products, containing from 0.4 wt % to 25 wt % of at least one sulfur-containing component, wherein the sulfur-containing component is selected from the group consisting of alkaline sulfide, hydrosulfide or mixture of both, which on gasification converts to hydrogen sulfide and at least one alkali-metal containing component, wherein the component is an alkali metal oxide, to provide a sulfur-containing and alkali metal containing coke product, wherein the coker feedstock comprises a hydrocarbon fraction having a boiling point of at least about 650°
F. and wherein said coking reaction conditions include a temperature of from about 800°
F. to about 930°
F.; and
(b) gasifying the coke product under gasification conditions in the presence of a catalyst, said catalyst comprising at least one metal oxide selected from the group consisting of alkali metal oxide and alkaline earth metal oxide, in order to convert (i) the coke to gaseous products (ii) the sulfur-containing component to hydrogen sulfide and (iii) the alkali metal -containing component to a solid residue.
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Abstract
Aqueous sulfur and caustic component-containing waste streams are disposed of in an environmentally acceptable manner employing a process featuring integrated coking and gasification operations.
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Citations
19 Claims
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1. A coking process which may be used for the disposal of an aqueous waste material, comprising the following steps:
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(a) reacting a coker feedstock under coking reaction conditions in the presence of an aqueous waste material, wherein the waste material is a caustic soda, caustic potash, or a mixture of both resulting from the refining of heavy hydrocarbons to lighter hydrocarbon products, containing from 0.4 wt % to 25 wt % of at least one sulfur-containing component, wherein the sulfur-containing component is selected from the group consisting of alkaline sulfide, hydrosulfide or mixture of both, which on gasification converts to hydrogen sulfide and at least one alkali-metal containing component, wherein the component is an alkali metal oxide, to provide a sulfur-containing and alkali metal containing coke product, wherein the coker feedstock comprises a hydrocarbon fraction having a boiling point of at least about 650°
F. and wherein said coking reaction conditions include a temperature of from about 800°
F. to about 930°
F.; and(b) gasifying the coke product under gasification conditions in the presence of a catalyst, said catalyst comprising at least one metal oxide selected from the group consisting of alkali metal oxide and alkaline earth metal oxide, in order to convert (i) the coke to gaseous products (ii) the sulfur-containing component to hydrogen sulfide and (iii) the alkali metal -containing component to a solid residue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A coking process which may be used for the disposal of an aqueous waste material, which comprises:
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(a) coking a coker feedstock under coking reaction conditions in the presence of an aqueous waste material, wherein the waste material is a caustic soda, caustic potash, or a mixture of both resulting from the refining of heavy hydrocarbons to lighter hydrocarbon products, containing from 0.4 wt % to 13 wt % of at least one sulfur-containing component, wherein the sulfur-containing component is selected from the group consisting of alkaline sulfide, hydrosulfide or a mixture of both, which on gasification converts to hydrogen sulfide and at least one alkali-metal containing component, wherein the component is an alkali metal hydroxide, to provide a sulfur-containing and alkali metal containing coke product, wherein the coker feedstock comprises a hydrocarbon fraction having a boiling point of at least about 650°
F. and wherein said coking reaction conditions include a temperature of from about 800°
F. to about 930°
F.; and(b) gasifying the coke product under gasification conditions in the presence of a catalyst, said catalyst comprising at least one metal oxide selected from the group consisting of alkali metal oxide and alkaline earth metal oxide, in order to convert (i) the coke to gaseous products (ii) the sulfur-containing component to hydrogen sulfide and (iii) the alkali metal-containing component to a solid residue.
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Specification