Direct crystallization of anhydrous sodium sulphate from the technological liquors of the rayon sector

1974 ◽  
Vol 5 (5) ◽  
pp. 521-525
Author(s):  
G. A. Akopyan ◽  
I. Z. Eifer ◽  
L. A. Burova
Keyword(s):  
Sodium Sulphate ◽  
Direct Crystallization ◽  
Anhydrous Sodium Sulphate

Continuous crystallization of anhydrous sodium sulphate from the precipitation liquor in rayon spinning

1976 ◽  
Vol 7 (3) ◽  
pp. 320-322
Author(s):  
P. I. Vladyko ◽  
A. K. Stavtsov ◽  
A. A. Nazarov
Keyword(s):  
Sodium Sulphate ◽  
Continuous Crystallization ◽  
Precipitation Liquor ◽  
Anhydrous Sodium Sulphate

Isolation of the Geminal Bis(amido) Derivative, N4P4(NH2)2Cl6, from the Reaction of N4P4Cl8 with Ammonia

1981 ◽  
Vol 36 (7) ◽  
pp. 894-895 ◽  
Author(s):  
P. Ramabrahmam ◽  
S. S. Krishnamurthy ◽  
M. Woods
Keyword(s):  
Nmr Spectroscopy ◽  
Diethyl Ether ◽  
Ammonia Synthesis ◽  
Aqueous Ammonia ◽  
Amino Derivative ◽  
Sodium Sulphate ◽  
Anhydrous Sodium Sulphate

Abstract Geminal Bis (amido)hexachlorocyclotetra -phosphazene, Aqueous Ammonia Synthesis, 31P NMR The geminal isomer of N4P4(NH2)2Cl6 is obtained from the reaction of the octachloride, N4P4Cl8, with aqueous ammonia in diethyl ether in the presence of anhydrous sodium sulphate. The compound is characterised by 31P NMR spectroscopy and by conversion to its dimethyl -amino derivative, N4P4(NH2)2(NMe2)6.

An unusual occurrence of bedded thenardite

1944 ◽  
Vol 27 (185) ◽  
pp. 29-31 ◽  
Author(s):  
Edmondson Spencer
Keyword(s):  
Land Surface ◽  
Sodium Sulphate ◽  
Salt Pans ◽  
Sandy Silt ◽  
Anhydrous Sodium Sulphate ◽  
Unusual Occurrence

A peculiar occurrence of anhydrous sodium sulphate, thenardite, has recently been discovered below the salt crystallizing pans at Didwana, Jodhpur State, India. Here salt (NaCl) is crystallized out by evaporation in open pans from brine obtained by sinking wells alongside the pans, to a depth of about 15–20 feet below the surface. The land surface consists of very fine sandy silt and the salt-pans are made by cutting shallow depressions about 120 feet long by 85 feet wide, a low ridge of silt about 2 feet high and 3 feet broad being left between them. The pans are cleaned out at the beginning of the salt season (February-March): the brine from the wells is run into them to a depth of 1 to 2 inches and the salt crystallizes out by evaporation.

Polymorphic Transitions in Anhydrous Sodium Sulphate

Nature ◽  
1958 ◽  
Vol 182 (4652) ◽  
pp. 1797-1798 ◽  
Author(s):  
R. J. BIRD
Keyword(s):  
Sodium Sulphate ◽  
Polymorphic Transitions ◽  
Anhydrous Sodium Sulphate

scholarly journals Composition and characterization by GC-MS of the essential oil extracted from Nicotiana glauca Graham

2019 ◽  
Vol 70 (3) ◽  
pp. 317
Author(s):  
A. Cherif ◽  
S. Ammar ◽  
S. Boukhchina
Keyword(s):  
Essential Oil ◽  
Northern Region ◽  
Sodium Sulphate ◽  
Gas Chromatography Mass Spectrometry ◽  
Nicotiana Glauca ◽  
Saturated Hydrocarbons ◽  
Water Distillation ◽  
Anhydrous Sodium Sulphate ◽  
High Level ◽  
Dibutyl Ester

Fresh leaves of N. glauca were collected from the northern region of Tunisia. The leaves were submitted to water distillation for 4 h, using a Clevenger-type apparatus. The obtained essential oils were dried over anhydrous sodium sulphate and after filtration, stored at 4 °C until use. The chemical composition of the isolated essential oil was analyzed by gas chromatography–mass spectrometry (GC–MS). Eighteen compounds were identified: eugenol, the major compound in the essential oil, was present at a high level (58.49%), followed by nonadecane, eugenyl acetate and tridecane, 3-methyl at 6.38; 5.57 and 5.19%, respectively. The percentage of compounds dodecane, 2, 6, 11 trimethyl, tetradecane, docosane, tricosane and 1, 2-benzene dicarboxilic, dibutyl ester varied between 1 and 2%; whereas the other compounds (including limonene, and saturated hydrocarbons) remained at low percentages, not exceeding 1%. This study could be very useful for the characterization, pharmaceutical and therapeutic applications of the essential oil from N. glauca.

scholarly journals Determination of illegal dyes in eggs by liquid chromatography - tandem mass spectrometry

2014 ◽  
Vol 58 (2) ◽  
pp. 247-253 ◽  
Author(s):  
Marta Piątkowska ◽  
Piotr Jedziniak ◽  
Jan Żmudzki
Keyword(s):  
Sodium Sulphate ◽  
Performance Criteria ◽  
Animal Origin ◽  
Food Of Animal Origin ◽  
Sudan I ◽  
Liquid Chromatography Tandem Mass ◽  
Orange G ◽  
Anhydrous Sodium Sulphate ◽  
Sudan Iv

Abstract A multiresidue method for simultaneous determination of 10 dyes unauthorised for the use in laying hens was developed (Sudan I, Sudan II, Sudan III, Sudan IV, Sudan Red G, Sudan Orange G, Sudan Red 7B, Para-Red, Toluidine Red, Citrus Red). The dyes were extracted using liquid-liquid extraction with acetonitrile in the presence of anhydrous sodium sulphate, and cleaned using zirconium coated silica cartridges. After dilution with acetonitrile saturated with hexane:DMSO (8:2), samples were analysed using LC-MS/MS system with acetonitrile (A) and 0.1% formic acid (B) as a mobile phase in a gradient mode and C18 analytical column. The method was validated according to the requirements described in the Commission Decision 2002/657/EC: linearity (r ≥ 0.998), precision: repeatability (1.94%-10.02%), and within-laboratory reproducibility (4.66%-8.89%), recovery (97%-105%), decision limit CCα (5.33-6.50 μg/kg), and detection capability CCβ (6.18-7.50 μg/kg) were calculated. The developed method fulfilled all performance criteria and can be used in the official survey of dyes residues in food of animal origin.

Effect of Water upon the Polymorphic Transitions in Anhydrous Sodium Sulphate

Nature ◽  
1958 ◽  
Vol 181 (4622) ◽  
pp. 1529-1529 ◽  
Author(s):  
E. L. KREIDL ◽  
IVAN SIMON
Keyword(s):  
Sodium Sulphate ◽  
Polymorphic Transitions ◽  
Effect Of Water ◽  
Anhydrous Sodium Sulphate

Modification of Natural Anhydrite by Mixed Exciter

2015 ◽  
Vol 1100 ◽  
pp. 56-59
Author(s):  
Dominik Gazdič ◽  
Jana Stachová ◽  
Radek Magrla
Keyword(s):  
Mineralogical Composition ◽  
Calcium Sulphate ◽  
Sodium Sulphate ◽  
Raw Material ◽  
Technological Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Technical Requirements ◽  
Anhydrous Sodium Sulphate ◽  
Grain Size And Shape

The objective of this experimental work was to monitor the influence of applied external exciter on anhydrite obtained properties. As a basic raw material anhydrite imported from Poland was used, as hydration exciter a mixture of anhydrous sodium sulphate and Portland cement CEM I 42.5 R in total dose of 5 % by anhydrite weight was applied. In the first step the anhydrite underwent the setting of mineralogical composition using the X-ray diffraction analysis (XRD) and monitoring of grain size and shape by the scanning electron microscopy (SEM). In the next step the influence of applied mixing exciter on obtained basic technological properties according to standard CSN EN 13454 was monitored. It was the setting of basic technological properties of anhydrite binder with and without addition of the mixing external exciter and also the setting of strengths of standard anhydrite mortar with addition of external mixing exciter. Upon the obtained values the comparison with technical requirements of the standard for calcium sulphate binders was carried out and this anhydrite mortar was classified as well.

Polymorphic Transitions in Anhydrous Sodium Sulphate

Nature ◽  
1959 ◽  
Vol 183 (4672) ◽  
pp. 1391-1391 ◽  
Author(s):  
C. N. R. RAO ◽  
L. V. GREGOR
Keyword(s):  
Sodium Sulphate ◽  
Polymorphic Transitions ◽  
Anhydrous Sodium Sulphate
Sign in / Sign up

Export Citation Format

Share Document