Method of regenerating used contaminant-removing material

Details Method of regenerating used contaminant-removing material Method of regenerating used contaminant-removing material

1974-01-23

1978-04-11

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group va metal or arsenic

208253, 208295, 423509, 423561R, C01B 2700, C01B 2900, C01G 2900, C22B 3000

Patent

active

040839249

ABSTRACT:
A method of regenerating used particulate contaminant-removing material, such as iron oxide or iron sulfide, that has been used to remove a contaminant, such as arsenic, from a synthetic hydrocarbonaceous feed and effect deposition of the contaminant within the material, characterized by a multi-step process as follows: (1) the used, or spent, contaminant-removing material is intimately contacted with a sulfur-containing material, such as hydrogen sulfide or sulfur, in an inert atmosphere of non-oxidizing fluid and at elevated temperature; (2) the contaminant deposited in the contaminant-removing material is reacted with the sulfur in the sulfur-containing material at the elevated temperature and the resulting sulfides of the contaminant; for example, arsenic sulfides; are converted to gaseous form to separate them from the regenerated contaminant-removing material; and (3) the sulfides of the contaminant are condensed and oxidized to form the oxides of the contaminant; for example, arsenic oxides. The oxides are, ordinarily, commercially desirable products that can be sold. Also disclosed are respective embodiments and the specific reaction conditions for carrying out the invention.

REFERENCES:
patent: 3069350 (1962-12-01), Ramella
patent: 3380819 (1968-04-01), Cavanagh
patent: 3519492 (1970-07-01), Huml et al.
patent: 3645912 (1972-02-01), Gatsis

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