CA2028300A1 - Membrane process for acid recovery - Google Patents
Membrane process for acid recoveryInfo
- Publication number
- CA2028300A1 CA2028300A1 CA2028300A CA2028300A CA2028300A1 CA 2028300 A1 CA2028300 A1 CA 2028300A1 CA 2028300 A CA2028300 A CA 2028300A CA 2028300 A CA2028300 A CA 2028300A CA 2028300 A1 CA2028300 A1 CA 2028300A1
- Authority
- CA
- Canada
- Prior art keywords
- dialysis
- acid
- compartments
- concentrate
- diluate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002253 acid Substances 0.000 title abstract 7
- 238000000034 method Methods 0.000 title abstract 4
- 239000012528 membrane Substances 0.000 title abstract 2
- 238000011084 recovery Methods 0.000 title abstract 2
- 238000000502 dialysis Methods 0.000 abstract 7
- 239000012141 concentrate Substances 0.000 abstract 5
- 150000001768 cations Chemical class 0.000 abstract 4
- 239000002184 metal Substances 0.000 abstract 4
- 229910052751 metal Inorganic materials 0.000 abstract 4
- 239000000243 solution Substances 0.000 abstract 4
- 238000000909 electrodialysis Methods 0.000 abstract 3
- 150000007513 acids Chemical class 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 150000001450 anions Chemical class 0.000 abstract 1
- 239000011260 aqueous acid Substances 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000012527 feed solution Substances 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 229910052700 potassium Inorganic materials 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/58—Multistep processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/24—Dialysis ; Membrane extraction
- B01D61/243—Dialysis
- B01D61/244—Dialysis comprising multiple dialysis steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/422—Electrodialysis
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Urology & Nephrology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A method for the recovery of acids from dilute aqueous acid solutions containing at least one metal cation such as Zn, Ca, Mg, Na, K, Mn, Al, Fe, Ni and Co comprises feeding solution to the dialyzate compartments of a dialysis unit.
The dialyzate, substantially containing any metal cations, is removed from the process. The diffusate, containing the acid from the feed solution and being substantially free of metal cations, is fed into the diluate stream circulating through the diluate compartments of an electrodialysis unit. A portion of the circulating diluate is returned to the diffusate compartments of the dialysis unit. The concentration gradient of acid anions across the dialysis membranes is increased by adding a quantity of acid-receiving solution to the returned diluate portion. The feed rates of solutions to the compartments of the dialysis unit are at least double those in processes using only dialysis. A concentrate stream is recirculated through the concentrate compartments of the electrodialysis unit. The applied current causes an increase in the acid concentration in the concentrate. A portion of the concentrate is withdrawn as a concentrated acid product substantially free of metal cations. If desired, the acid concentration in the product is controlled by feeding a quantity of the diffusate from the dialysis into the circulating concentrate stream, as necessary. The dialysis is carried out at ambient temperatures up to 45C, and electrodialysis at from 0 to 60C and at 100 to 1000 A/m2.
The dialyzate, substantially containing any metal cations, is removed from the process. The diffusate, containing the acid from the feed solution and being substantially free of metal cations, is fed into the diluate stream circulating through the diluate compartments of an electrodialysis unit. A portion of the circulating diluate is returned to the diffusate compartments of the dialysis unit. The concentration gradient of acid anions across the dialysis membranes is increased by adding a quantity of acid-receiving solution to the returned diluate portion. The feed rates of solutions to the compartments of the dialysis unit are at least double those in processes using only dialysis. A concentrate stream is recirculated through the concentrate compartments of the electrodialysis unit. The applied current causes an increase in the acid concentration in the concentrate. A portion of the concentrate is withdrawn as a concentrated acid product substantially free of metal cations. If desired, the acid concentration in the product is controlled by feeding a quantity of the diffusate from the dialysis into the circulating concentrate stream, as necessary. The dialysis is carried out at ambient temperatures up to 45C, and electrodialysis at from 0 to 60C and at 100 to 1000 A/m2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002028300A CA2028300C (en) | 1990-10-23 | 1990-10-23 | Membrane process for acid recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002028300A CA2028300C (en) | 1990-10-23 | 1990-10-23 | Membrane process for acid recovery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2028300A1 true CA2028300A1 (en) | 1992-04-24 |
| CA2028300C CA2028300C (en) | 1996-07-16 |
Family
ID=4146227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002028300A Expired - Fee Related CA2028300C (en) | 1990-10-23 | 1990-10-23 | Membrane process for acid recovery |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2028300C (en) |
-
1990
- 1990-10-23 CA CA002028300A patent/CA2028300C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2028300C (en) | 1996-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |