TECHNOLOGY OF IODINE EXTRACTING FROM FORMATION AND ASSOCIATED WATER OF OIL AND GAS FIELDS

• US 20200131037A1
• Filed: 10/24/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2019
• Status: Active Application

• Current Assignee: Lia Neumann, Serguei Tikhonov
• Original Assignee: Lia Neumann, Serguei Tikhonov
• Inventors: TIKHONOV, Serguei, NEUMANN, Lia, ISHANGULYYEV, Yusub
• Application Number:
  US16/662,458
• Publication Number:
  US 20200131037A1
• Time in Patent Office: Days
• CPC Class Codes: B01D 2251/304 of sodium
• CPC Class Codes: B01D 2251/604 Hydroxides
• CPC Class Codes: B01D 53/1418 Recovery of products
• CPC Class Codes: C01B 7/14 Iodine
• CPC Class Codes: C02F 1/02 by heating methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D
• CPC Class Codes: C02F 1/20 by degassing, i.e. liberation of dissolved gases degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D
• CPC Class Codes: C02F 1/281 using inorganic sorbents
• CPC Class Codes: C02F 1/40 Devices for separating or removing fatty or oily substances or similar floating material cleaning or keeping clear the surface of open water from oil or like materials E02B15/04; devices in sewers for separating liquid or solid substances from sewage E03F5/14, e.g. for use in drains leading to the sewer E03F5/16
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 1/76 with halogens or compounds of halogens C02F1/4674 takes precedence
• CPC Class Codes: C02F 2001/5218 Crystallization
• CPC Class Codes: C02F 2101/12 Halogens or halogen-containing compounds
• CPC Class Codes: C02F 2103/10 from quarries or from mining activities
• CPC Class Codes: C02F 2209/02 Temperature
• CPC Class Codes: C02F 2209/06 pH
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage

Abstract

The present invention relates to a method for extracting iodine from an aqueous brine, the method comprising the steps:

• • Providing an aqueous brine containing iodide ions;
  • Heating the aqueous brine containing iodide ions;
  • Adding an acid to the aqueous brine to arrive at a pH value from 2 to 4;
  • Adding an oxidizing agent to the aqueous brine;
  • Desorbing iodine by means of an airflow;
  • Adding a sorbent for chemisorbing the iodine;
  • Crystallizing the iodine;
  • Purifying the iodine under a layer of sulfuric acid;
  • Sublimation of the iodine.

Claims

1. Method for extracting iodine from an aqueous brine, the method comprising the steps:

Providing an aqueous brine;

Heating the aqueous brine;

Adding an acid to the aqueous brine to arrive at a pH value from 2 to 4;

Adding an oxidizing agent to the aqueous brine to form iodine from iodide contained in the brine;

Desorbing the iodine by means of an airflow;

Adding a sorbent for chemisorbing the iodine;

Crystallizing the iodine;

Purifying the iodine under a layer of sulfuric acid;

Sublimation of the iodine.

2. Method according to claim 1, wherein the aqueous brine is formation and associated waters from oil and gas fields.

3. Method according to claim 1, wherein the aqueous brine comprises the iodide ions in an amount of at least 20 mg/l, with respect to the total volume of the aqueous brine.

4. Method according to claim 1, wherein heating the aqueous brine comprises heating to a temperature from 45 to 50°

C.

5. Method according to claim 1, wherein the pH of the aqueous brine after adding the acid is from 2.5 to 3.5.

6. Method according to claim 1, wherein the acid is sulfuric acid and/or hydrochloric acid.

7. Method according to claim 1, wherein the oxidizing agent is chlorine or chlorine water.

8. Method according to claim 1, wherein the desorbing is carried out in a vertical column apparatus filled with a desorber packing.

9. Method according to claim 1, wherein the desorbing is carried out with an airflow rate in the range from 105 to 150 m³/m³, with respect to the volume of the aqueous brine.

10. Method according to claim 8, wherein a water density of the desorber packing is 60 m²/m³, with respect to the vertical column apparatus cross-section square.

11. Method according to claim 1, wherein the sorbent is sodium hydroxide and or iodine-hydrogen and sulfuric acids.

12. Method according to claim 1, wherein the purifying of the iodine under a layer of sulfuric acid is carried out at a the temperature of 100 to 160°

C.

13. Reactor system for carrying out the method according to claim 1, comprising:

a water heater (2);

a tank for storing an oxidizing agent (6);

means for carrying out iodine oxidation (8);

a desorber (5);

an absorption column (15);

a crystallizer (19);

an iodine melting node (21); and

a sublimator (22).

14. Method according to claim 9, wherein a water density of the desorber packing is 60 m²/m³, with respect to the vertical column apparatus cross-section square.