CA2086153A1 - Process for the preparation of anhydrous sodium sulfate from a brine - Google Patents
Process for the preparation of anhydrous sodium sulfate from a brineInfo
- Publication number
- CA2086153A1 CA2086153A1 CA 2086153 CA2086153A CA2086153A1 CA 2086153 A1 CA2086153 A1 CA 2086153A1 CA 2086153 CA2086153 CA 2086153 CA 2086153 A CA2086153 A CA 2086153A CA 2086153 A1 CA2086153 A1 CA 2086153A1
- Authority
- CA
- Canada
- Prior art keywords
- sodium sulfate
- anhydrous sodium
- brine
- glauber salt
- saturated solution
- 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.)
- Abandoned
Links
Abstract
PROCESS FOR THE PREPARATION OF
ANHYDROUS SODIUM SULFATE FROM A BRINE
ABSTRACT
Process for the preparation of anhydrous sodium sulfate from a brine containing sodium sulfate, comprising: mining the brine from the underground; crystallizing the brine by cooling it to crystallize a fine dust of sodium sulfate hydrated with ten molecules of water known as Glauber salt;
separating the Glauber salt from the exhausted solution;
melting the Glauber salt to dissolve the crystals of sodium sulfate in its own crystallization water to obtain a sodium sulfate saturated solution with 17% of solids of anhydrous sodium sulfate; separating the crystals of anhydrous sodium sulfate from the saturated solution; recycling the remaining saturated solution to the crystallization step; and drying the anhydrous sodium sulfate crystals.
ANHYDROUS SODIUM SULFATE FROM A BRINE
ABSTRACT
Process for the preparation of anhydrous sodium sulfate from a brine containing sodium sulfate, comprising: mining the brine from the underground; crystallizing the brine by cooling it to crystallize a fine dust of sodium sulfate hydrated with ten molecules of water known as Glauber salt;
separating the Glauber salt from the exhausted solution;
melting the Glauber salt to dissolve the crystals of sodium sulfate in its own crystallization water to obtain a sodium sulfate saturated solution with 17% of solids of anhydrous sodium sulfate; separating the crystals of anhydrous sodium sulfate from the saturated solution; recycling the remaining saturated solution to the crystallization step; and drying the anhydrous sodium sulfate crystals.
Description
BACKGROUND OF THE INVENTION
This invention relates to a process for the preparation of anhydrous sodium sulfate from a brine and, more specifically, it relates to a process to produce anhydrous sodium sulfate from a brine which has sodium sulfate in solution.
The known conventional process to produce sodium sulfate, starts from a brine which is extracted from the underground and stored in a reservoir and therefrom it is conducted to a crystallizer wherein, by cooling, crystals are produced in the form of a fine powder of sodium sulfate hydrated with ten molecules of water, known a~ Glauber salt (Na2S04-10H20), which is settled, then filtered and conducted to a reservoir wherein it is melted to dissolve the crystals of sodium sulfate in its own hydrating water, to produce a saturated solution of sodium sulfate with 17% of solids, which is then partially evaporated to obtain a suspension of anhydrous sodium sulfate with 20% of solids in a saturated ~olution, said suspension is then settled and centrifuged to concentrate the solids of anhydrous sodium sulfate which are separated and dried recycling the remaining saturated solution back to the evaporation step.
In said conventional process the crystallization of the Glauber salt is carried out by cooling it at about 30C to about 20~C in a special crystallizer.
The evaporation step has been considered as strictly necessary to concentrate the solids of anhydrous sodium sulfate up to 20%.
With these antecedents the inventor ~ound that if after the melting of the hydrated ~odium ~ulfate it is obtained a 17~ of solids of anhydrous sodium sulfate, this solids could be directly separated by settling and centrifugi~g, conditioned to recycling the saturated solution to the crystallization step to avoid both, the wasting of the solution, and the evaporation step and e~uipment with its associated energy consumption, because only an additional 3%
of the total production is attributable to this evapotation step in return for a considerable amount of equipment, energy and maintenance.
O~JECTS OF THE INVENTION
It i8 therefore a main object of the instant invention, to provide a process for the preparation of anhydrous sodium sulfate from a brine containing sodium sulfate.
It is an additional object of the instant invention to provide a process for the preparation of anhydrous sodium sulfate of the aforesaid nature, by means of which the anhydrous ~odium sulfate is directly obtained after the melting of the Glauber ~alt and thereafter the sodium sulfate saturated solution i8 recycled to the crystallization step, avoiding in this way the evaporation step of the conventional process.
It is an additional object of the instant invention, to provide a process for the preparation of anhydrous sodium sulfate, of the aforesaid pointed nature, in which the evaporation step and equipment and their associated energy consumption are avoided.
These and other objects and advantages of the instant invention will be readily apparent for those skilled in the art, from the detailed description of the invention and the accompanying drawing.
~RIEF DESCRIPTION OF THE DRAWING
Figure 1 is a block diagram of the process for the production of anhydrous sodium sulfate from a brine containing sodium sulfate.
DETAILED DESCRI~TION OF THE INVENTION
Referring to Figure 1 it is disclosed a process for the production of anhydrous sodium sulfate from a brine of sodium sulfate, which comprises:
a) mining the brine of sodium sulfate from an underground deposit;
b) storing the brine in a reservoir;
c) crystallizing the Glauber salt in an exhausted solution which comprises a little quantity of sludges and other impurities by cooling in a special crystallizer;
d) settling and filtering the Glauber salt separating the exhausted solution with sludges and impurities;
e) melting the Glauber salt at a temperature of approximately 60C to dissolve the Na,SO4-10H2O in its own crystallization water to obtain a suspension which comprises a sodium sulfate saturated solution and 17% by weight of anhydrous ~odium sulfate crystals of the total weight of the Glauber salt from which lt was originated:
f) settling and centrifuging the resulting suspension to separate the anhydrous sodium sulfate crystals;
g) recycling the saturated solution remaining from the settling and centrifuging, to the crystallization step and;
h) drying the anhydrous sodium sulfate SFA in a heart furnace through which air indirectly heated in a boiler to about 100C is blown to separate the remaining water AR.
It should be understood that the scope of the instant invention is not limited to the specific examples of process and equipment above described and that those skilled in the art will be enabled to make multiple variations in the process steps and operation conditions of the instant invention and that this changes will fall within the spirit and scope of the invention as claimed hereafter.
This invention relates to a process for the preparation of anhydrous sodium sulfate from a brine and, more specifically, it relates to a process to produce anhydrous sodium sulfate from a brine which has sodium sulfate in solution.
The known conventional process to produce sodium sulfate, starts from a brine which is extracted from the underground and stored in a reservoir and therefrom it is conducted to a crystallizer wherein, by cooling, crystals are produced in the form of a fine powder of sodium sulfate hydrated with ten molecules of water, known a~ Glauber salt (Na2S04-10H20), which is settled, then filtered and conducted to a reservoir wherein it is melted to dissolve the crystals of sodium sulfate in its own hydrating water, to produce a saturated solution of sodium sulfate with 17% of solids, which is then partially evaporated to obtain a suspension of anhydrous sodium sulfate with 20% of solids in a saturated ~olution, said suspension is then settled and centrifuged to concentrate the solids of anhydrous sodium sulfate which are separated and dried recycling the remaining saturated solution back to the evaporation step.
In said conventional process the crystallization of the Glauber salt is carried out by cooling it at about 30C to about 20~C in a special crystallizer.
The evaporation step has been considered as strictly necessary to concentrate the solids of anhydrous sodium sulfate up to 20%.
With these antecedents the inventor ~ound that if after the melting of the hydrated ~odium ~ulfate it is obtained a 17~ of solids of anhydrous sodium sulfate, this solids could be directly separated by settling and centrifugi~g, conditioned to recycling the saturated solution to the crystallization step to avoid both, the wasting of the solution, and the evaporation step and e~uipment with its associated energy consumption, because only an additional 3%
of the total production is attributable to this evapotation step in return for a considerable amount of equipment, energy and maintenance.
O~JECTS OF THE INVENTION
It i8 therefore a main object of the instant invention, to provide a process for the preparation of anhydrous sodium sulfate from a brine containing sodium sulfate.
It is an additional object of the instant invention to provide a process for the preparation of anhydrous sodium sulfate of the aforesaid nature, by means of which the anhydrous ~odium sulfate is directly obtained after the melting of the Glauber ~alt and thereafter the sodium sulfate saturated solution i8 recycled to the crystallization step, avoiding in this way the evaporation step of the conventional process.
It is an additional object of the instant invention, to provide a process for the preparation of anhydrous sodium sulfate, of the aforesaid pointed nature, in which the evaporation step and equipment and their associated energy consumption are avoided.
These and other objects and advantages of the instant invention will be readily apparent for those skilled in the art, from the detailed description of the invention and the accompanying drawing.
~RIEF DESCRIPTION OF THE DRAWING
Figure 1 is a block diagram of the process for the production of anhydrous sodium sulfate from a brine containing sodium sulfate.
DETAILED DESCRI~TION OF THE INVENTION
Referring to Figure 1 it is disclosed a process for the production of anhydrous sodium sulfate from a brine of sodium sulfate, which comprises:
a) mining the brine of sodium sulfate from an underground deposit;
b) storing the brine in a reservoir;
c) crystallizing the Glauber salt in an exhausted solution which comprises a little quantity of sludges and other impurities by cooling in a special crystallizer;
d) settling and filtering the Glauber salt separating the exhausted solution with sludges and impurities;
e) melting the Glauber salt at a temperature of approximately 60C to dissolve the Na,SO4-10H2O in its own crystallization water to obtain a suspension which comprises a sodium sulfate saturated solution and 17% by weight of anhydrous ~odium sulfate crystals of the total weight of the Glauber salt from which lt was originated:
f) settling and centrifuging the resulting suspension to separate the anhydrous sodium sulfate crystals;
g) recycling the saturated solution remaining from the settling and centrifuging, to the crystallization step and;
h) drying the anhydrous sodium sulfate SFA in a heart furnace through which air indirectly heated in a boiler to about 100C is blown to separate the remaining water AR.
It should be understood that the scope of the instant invention is not limited to the specific examples of process and equipment above described and that those skilled in the art will be enabled to make multiple variations in the process steps and operation conditions of the instant invention and that this changes will fall within the spirit and scope of the invention as claimed hereafter.
Claims (4)
1. Process for the preparation of anhydrous sodium sulfate from a brine containing sodium sulfate, comprising:
mining the brine from the underground; crystallizing the brine by means of cooling to obtain a fine dust of sodium sulfate hydrated with ten molecules of water known as Glauber salt;
separating the Glauber salt from the exhausted solution;
melting the Glauber salt to dissolve the sodium sulfate crystals in its own crystallization water to obtain a saturated solution with approximately 17% by weight of solids of anhydrous sodium sulfate; separating the anhydrous sodium sulfate crystals from the saturated solution; recycling the remaining saturated solution to the crystallization step; and drying the anhydrous sodium sulfate crystals.
mining the brine from the underground; crystallizing the brine by means of cooling to obtain a fine dust of sodium sulfate hydrated with ten molecules of water known as Glauber salt;
separating the Glauber salt from the exhausted solution;
melting the Glauber salt to dissolve the sodium sulfate crystals in its own crystallization water to obtain a saturated solution with approximately 17% by weight of solids of anhydrous sodium sulfate; separating the anhydrous sodium sulfate crystals from the saturated solution; recycling the remaining saturated solution to the crystallization step; and drying the anhydrous sodium sulfate crystals.
2. The process according to claim 1, wherein separation of the Glauber salt from the exhausted solution is carried by settling and filtering, refusing the exhausted solution.
3. The process according to claim 1, wherein separation of the solids of anhydrous sodium sulfate after the melting of the Glauber salt is carried out by settling and centrifuging, recycling the remaining saturated solution to the crystallization step.
4. The process according to claim 1, wherein the solids of anhydrous sodium sulfate are dried in a heart furnace with air at a temperature of about 100°C and then cooled to be packaged, separating the residual water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MX9200056 | 1991-12-27 | ||
| MX9200056A MX9200056A (en) | 1991-12-27 | 1991-12-27 | PROCESS FOR THE OBTAINING OF ANHYDROUS SODIUM SULPHATE FROM BRINE. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2086153A1 true CA2086153A1 (en) | 1993-06-28 |
Family
ID=19743623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2086153 Abandoned CA2086153A1 (en) | 1991-12-27 | 1992-12-23 | Process for the preparation of anhydrous sodium sulfate from a brine |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2086153A1 (en) |
| MX (1) | MX9200056A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928020A (en) * | 2010-05-21 | 2010-12-29 | 四川省川眉芒硝有限责任公司 | Continuous crystallization manufacturing process of medicinal glauber salt |
-
1991
- 1991-12-27 MX MX9200056A patent/MX9200056A/en unknown
-
1992
- 1992-12-23 CA CA 2086153 patent/CA2086153A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928020A (en) * | 2010-05-21 | 2010-12-29 | 四川省川眉芒硝有限责任公司 | Continuous crystallization manufacturing process of medicinal glauber salt |
| CN101928020B (en) * | 2010-05-21 | 2011-11-23 | 四川省川眉芒硝有限责任公司 | Continuous crystallization manufacturing process of medicinal glauber salt |
Also Published As
| Publication number | Publication date |
|---|---|
| MX9200056A (en) | 1993-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |