Method of regenerating an aqueous glycol solution containing salts
AssigneesInstitut Francais du Petrole, Prosernat
InventorsGéraldine Laborie, Fabrice Lecomte, Chantal Rigaill, Lionel Waintraub
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Abstract
Method of regenerating a glycol solution containing water, hydrocarbons and salts. The glycol solution is expanded in drum (2), then distilled in column (7). The concentrated glycol collected at the level of reboiler (8) is placed under vacuum to vaporize the water and to precipitate the salts. The salts are separated from the glycol in separation device (13). The concentrated glycol freed of the salts is stored in capacity (16).
Claims12
A method of regenerating a glycol solution containing water, hydrocarbons and dissolved salts, comprising the following stages:
- a) expanding said solution so as to release hydrocarbons and to obtain a hydrocarbon-poor solution,
- b) distilling in a distillation column the hydrocarbon-poor solution obtained in stage a) to obtain a glycol-enriched solution and a vapor comprising water and hydrocarbons,
- c) placing under vacuum a first part of the glycol-enriched solution obtained in stage b) under a pressure below 90,000 Pa abs. to obtain vaporized water and a glycol solution comprising precipitated salts, and
- d) separating the precipitated salts from the glycol solution obtained in stage c) to obtain precipitated salts and a salt-depleted glycol solution, wherein the salts comprise at least one compound selected from the group consisting of sodium chloride, potassium chloride, calcium chloride, sodium bicarbonate, sodium sulfate, potassium sulfate and calcium sulfate.
A method of regenerating a glycol solution containing water, hydrocarbons and dissolved salts, comprising the following stages:
- a) expanding said solution so as to release hydrocarbons and to obtain a hydrocarbon-poor solution,
- b) distilling in a distillation column the hydrocarbon-poor solution obtained in stage a) to obtain a glycol-enriched solution and a vapor comprising water and hydrocarbons,
- c) placing under vacuum a first part of the glycol-enriched solution obtained in stage b) under a pressure below 90,000 Pa abs. to obtain vaporized water and a glycol solution comprising precipitated salts,
- d) separating the precipitated salts from the glycol solution obtained in stage c) to obtain precipitated salts and a salt-depleted glycol solution,
- e) placing under vacuum the salt-depleted glycol solution obtained in stage d) under a pressure below 50,000 Pa abs. to obtain vaporized water and a glycol solution comprising precipitated salts, and
- f) separating the precipitated salts from the glycol solution obtained in stage e) to obtain precipitated salts and a second salt-depleted glycol solution, wherein the second salt-depleted glycol solution f) heats the hydrocarbon-poor solution obtained in stage a).
A method of regenerating a glycol solution containing water, hydrocarbons and dissolved salts, comprising the following stages:
- a) expanding said solution so as to release hydrocarbons and to obtain a hydrocarbon-poor solution,
- b) distilling in a distillation column the hydrocarbon-poor solution obtained in stage a) to obtain a glycol-enriched solution and a vapor comprising water and hydrocarbons,
- c) placing under vacuum a first part of the glycol-enriched solution obtained in stage b) under a pressure below 90,000 Pa abs. to obtain vaporized water and a glycol solution comprising precipitated salts, and
- d) separating the precipitated salts from the glycol solution obtained in stage c) to obtain precipitated salts and a salt-depleted glycol solution, wherein the glycol consists of a compound selected from the group consisting of monoethylene glycol, diethylene glycol and triethylene glycol.
Dependencies are inferred from the claim text.