GB233669A - - Google Patents
Info
- Publication number
- GB233669A GB233669A GB7827/25A GB782725A GB233669A GB 233669 A GB233669 A GB 233669A GB 7827/25 A GB7827/25 A GB 7827/25A GB 782725 A GB782725 A GB 782725A GB 233669 A GB233669 A GB 233669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ammonia
- phosphate
- magnesium
- precipitation
- recovered
- 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
-
- 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
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts
- D01F2/04—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts from cuprammonium solutions
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Removal Of Specific Substances (AREA)
Abstract
In the manufacture of artificial filaments by the cuprammonium process in which the warm water used as precipitant is renewed so that the ammonia concentration does not exceed 0.05 per cent, the ammonia is recovered from the precipitant by precipitation as magnesium ammonium phosphate.ALSO:Ammonia present in waste liquors resulting from the manufacture of artificial silk by the cuprammonium process is recovered by precipitation as magnesium ammonium phosphate, which may be treated with an amount of sulphuric or other acid equivalent to the ammonia, the ammonia being then recovered, for example, as ammonium sulphate. Examples of the process are given.ALSO:Ammonia present in waste liquors resulting from the manufacture of artificial silk by the cuprammonium process is recovered by precipitation as magnesium ammonium phosphate. The liquors may be treated with solutions of magnesium chloride and sodium phosphate, or alternatively, precipitation may be effected by direct addition of an hydrated magnesium hydrogen phosphate, such as the phosphate MgHPO4.7H2O. The latter compound may be prepared from other magnesium phosphates, such as that obtained by heating magnesium ammonium phosphate, by dissolving them in acid, such as sulphuric acid, and precipitating the desired phosphate by addition of soda, the precipitation being effected either as a separate step or directly in the presence of the waste liquors. An hydrated magnesium hydrogen phosphate suitable for use in the process may be prepared also by treating the obtained magnesium ammonium phosphate with an amount of sulphuric or other acid equivalent to the ammonia. Examples of the process are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE598134X | 1924-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB233669A true GB233669A (en) | 1925-12-17 |
Family
ID=6574156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7827/25A Expired GB233669A (en) | 1924-05-06 | 1925-03-23 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR598134A (en) |
| GB (1) | GB233669A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19503599A1 (en) * | 1995-02-03 | 1996-08-08 | Reik Schleifmittelwerke Dresde | Granular material contg. magnesium hydrogen phosphate-3-hydrate as active component |
| US7471962B2 (en) | 1999-12-28 | 2008-12-30 | Hitachi Metals, Ltd. | High-frequency switch circuit, high-frequency switch module and wireless communications device comprising it |
-
1925
- 1925-03-23 GB GB7827/25A patent/GB233669A/en not_active Expired
- 1925-05-05 FR FR598134D patent/FR598134A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19503599A1 (en) * | 1995-02-03 | 1996-08-08 | Reik Schleifmittelwerke Dresde | Granular material contg. magnesium hydrogen phosphate-3-hydrate as active component |
| DE19503599C2 (en) * | 1995-02-03 | 2000-08-10 | Eberhard Koenig | Granules with magnesium hydrogen phosphate-3-hydrate as active component, process for its production and use of the granules in wastewater treatment |
| US7471962B2 (en) | 1999-12-28 | 2008-12-30 | Hitachi Metals, Ltd. | High-frequency switch circuit, high-frequency switch module and wireless communications device comprising it |
Also Published As
| Publication number | Publication date |
|---|---|
| FR598134A (en) | 1925-12-07 |
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