GB994516A - Process for recovering anhydrous sodium sulphate and sulphuric acid - Google Patents
Process for recovering anhydrous sodium sulphate and sulphuric acidInfo
- Publication number
- GB994516A GB994516A GB23417/62A GB2341762A GB994516A GB 994516 A GB994516 A GB 994516A GB 23417/62 A GB23417/62 A GB 23417/62A GB 2341762 A GB2341762 A GB 2341762A GB 994516 A GB994516 A GB 994516A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sodium sulphate
- anhydrous sodium
- solution
- tank
- acid
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/18—Dehydration
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- C01B17/901—Recovery from spent acids containing metallic ions, e.g. hydrolysis acids, pickling acids
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/02—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of cellulose, cellulose derivatives or proteins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
<PICT:0994516/C1/1> Sulphuric acid and anhydrous sodium sulphate are recovered from the waste coagulating bath acid from the viscose process by seeding the preconcentrated waste acid solution, constituting a metastable super-saturated solution of sodium sulphate in sulphuric acid, with anhydrous sodium sulphate, and separating the crystals of anhydrous sodium sulphate formed. Preferably, the "seed" is obtained by concentrating and cooling the waste bath acid, and separated and dehydrating the precipitated hydrous sodium sulphate. Sulphuric acid is recovered in the plant to the left of inlet 1 in Fig. 1; waste acid solution introduced at 1 is concentrated in heat exchanger 5 and evaporator 6 and passed into crystallizer 8 into which is charged a slurry of anhydrous sodium sulphate supplied from tank 40 by line 43; anhydrous sodium sulphate crystals formed are withdrawn as slurry through tank 45 and filter 46; saturated sodium sulphate solution overflowing from the crystallizer at 9, 11 is recycled, or transferred to storage tank 13, respectively; the solution from 13 is vacuum evaporated in 15 and 16 and directed for the major part into storage tank 18 for recovered sulphuric acid, and for the minor part into vacuum crystallizer 20; in 20 the saturated solution deposits hydrated sodium sulphate which is filtered at 22, the mother liquor passing to acid storage tank 18 and the crystals being charged into tank 23 on the right-hand side of the Figure. On this side is plant for the production of anhydrous sodium sulphate from the decahydrate; from the sodium sulphate solution in 23 anhydrous sodium sulphate precipitates; the crystal-containing solution is transferred to tank 25 from which some of the supernatural liquor is recycled to 23, and from which a crystal slurry of anhydrous sodium sulphate is withdrawn to centrifuge 38; the mother liquor from the crystals is fed, together with supernatant liquor from 25, to tank 29 and is cycled through heat exchanger 37 and evaporator 33 until super-saturated in sodium sulphate; in crystallizer 34 anhydrous sodium sulphate precipitates from the super-saturated solution, as in 23, and a slurry thereof is withdrawn to tank 25, supernatant from 34 being recirculated through the heat exchanger and evaporator, anhydrous sodium sulphate is recovered in centrifuge 38. Precipitation of anhydrous sodium sulphate from sodium sulphate solution is effected where indicated by maintaining the solution temperature above 32.4 DEG C. i.e. the transition temperature of the change Na2SO4.10H2O --> Na2SO4 (anhydrous).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEN0021732 | 1962-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB994516A true GB994516A (en) | 1965-06-10 |
Family
ID=7341851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23417/62A Expired GB994516A (en) | 1962-06-20 | 1962-06-18 | Process for recovering anhydrous sodium sulphate and sulphuric acid |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1469117A1 (en) |
| GB (1) | GB994516A (en) |
| NL (1) | NL280218A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205631B (en) * | 2007-10-16 | 2010-04-21 | 浙江富丽达股份有限公司 | Acid bath method during viscose fibre production process |
| CN102268748A (en) * | 2011-04-27 | 2011-12-07 | 辽宁迈科技术发展有限责任公司 | 14-stage device for evaporating acid bath for viscose |
| CN103510166A (en) * | 2012-06-20 | 2014-01-15 | 杭州奥通科技有限公司 | High wet modulus viscose fiber coagulating bath processing assembly line |
-
0
- NL NL280218D patent/NL280218A/xx unknown
-
1962
- 1962-06-18 GB GB23417/62A patent/GB994516A/en not_active Expired
- 1962-06-20 DE DE19621469117 patent/DE1469117A1/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205631B (en) * | 2007-10-16 | 2010-04-21 | 浙江富丽达股份有限公司 | Acid bath method during viscose fibre production process |
| CN102268748A (en) * | 2011-04-27 | 2011-12-07 | 辽宁迈科技术发展有限责任公司 | 14-stage device for evaporating acid bath for viscose |
| CN103510166A (en) * | 2012-06-20 | 2014-01-15 | 杭州奥通科技有限公司 | High wet modulus viscose fiber coagulating bath processing assembly line |
| CN103510166B (en) * | 2012-06-20 | 2016-01-20 | 杭州奥通科技有限公司 | Koplon coagulating bath process streamline |
Also Published As
| Publication number | Publication date |
|---|---|
| NL280218A (en) | 1900-01-01 |
| DE1469117A1 (en) | 1969-04-30 |
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