Conductivity of Sodium Sulfate Solutions Containing Sodium Hydroxide or Sulfuric Acid.

1957 ◽  
Vol 2 (1) ◽  
pp. 69-72 ◽  
Author(s):  
R. V. Lundquist ◽  
R. W. Lewis
Keyword(s):  
Sulfuric Acid ◽  
Sodium Hydroxide ◽  
Sodium Sulfate ◽  
Sulfate Solutions

Acidity of sulfuric acid-sodium sulfate solutions by kinetic measurements

AIChE Journal ◽  
1991 ◽  
Vol 37 (11) ◽  
pp. 1744-1748 ◽  
Author(s):  
Bhart Indu ◽  
M. Fazlul Hoq ◽  
William R. Ernst
Keyword(s):  
Sulfuric Acid ◽  
Sodium Sulfate ◽  
Kinetic Measurements ◽  
Sulfate Solutions

scholarly journals Recovery of Acid and Base from Sodium Sulfate Containing Lithium Carbonate Using Bipolar Membrane Electrodialysis

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 152
Author(s):  
Wenjie Gao ◽  
Qinxiang Fang ◽  
Haiyang Yan ◽  
Xinlai Wei ◽  
Ke Wu
Keyword(s):  
Sulfuric Acid ◽  
Sodium Hydroxide ◽  
Sodium Sulfate ◽  
Lithium Carbonate ◽  
Environmental Benefits ◽  
Raw Material ◽  
Process Conditions ◽  
Bipolar Membrane ◽  
Experimental Conditions ◽  
Bipolar Membrane Electrodialysis

Lithium carbonate is an important chemical raw material that is widely used in many contexts. The preparation of lithium carbonate by acid roasting is limited due to the large amounts of low-value sodium sulfate waste salts that result. In this research, bipolar membrane electrodialysis (BMED) technology was developed to treat waste sodium sulfate containing lithium carbonate for conversion of low-value sodium sulfate into high-value sulfuric acid and sodium hydroxide. Both can be used as raw materials in upstream processes. In order to verify the feasibility of the method, the effects of the feed salt concentration, current density, flow rate, and volume ratio on the desalination performance were determined. The conversion rate of sodium sulfate was close to 100%. The energy consumption obtained under the best experimental conditions was 1.4 kWh·kg−1. The purity of the obtained sulfuric acid and sodium hydroxide products reached 98.32% and 98.23%, respectively. Calculated under the best process conditions, the total process cost of BMED was estimated to be USD 0.705 kg−1 Na2SO4, which is considered low and provides an indication of the potential economic and environmental benefits of using applying this technology.

The Influence of Heat and Two Stages Precipitation in the Process of Natural Polymer Purification from the Byproduct of Bioethanol Process Base on Empty Palm Fruit Bunch

2015 ◽  
Vol 1123 ◽  
pp. 177-181
Author(s):  
Achmad Hanafi ◽  
Harry Budiman ◽  
Fauzan Aulia
Keyword(s):  
Sulfuric Acid ◽  
Sodium Hydroxide ◽  
Room Temperature ◽  
Black Liquor ◽  
Ash Content ◽  
Natural Polymer ◽  
Palm Fruit ◽  
Second Stage ◽  
Direct Precipitation ◽  
Two Stages

The biopolymer material, lignin, was recovered from the black liquor by acidification of the black liquor using sulfuric acid. Several purification techniques were carried out to produce the high purity of lignin such as gradual precipitation of lignin from black liquor (first stage: precipitation at pH 7, second stage: precipitation at pH 2) and the diluting of crude lignin by sodium hydroxide then followed by re-precipitation at different temperature. Subsequently, the impurities of lignin product resulted from each purification techniques was determined as ash content that analyzed using temperature program furnace; and the content of lignin was investigated using spectrophotometer UV-Vis. The result showed that the content of lignin of material produced from gradual precipitation was approximately 77.6%. It was higher than the content of lignin about 3.4% of material produced from direct precipitation to pH 2. In addition, the elevating of temperature from 40 to 60°C was no considerably affect to the content of lignin in precipitate produced from re-precipitation of crude lignin solution in sodium hydroxide. Nonetheless, the content of lignin of precipitate improved 15% when the temperature of re-precipitation of crude lignin solution in sodium hydroxide was raised from room temperature to 40-60°C.

Mechanism of expansion of mortars immersed in sodium sulfate solutions

2013 ◽  
Vol 43 ◽  
pp. 105-111 ◽  
Author(s):  
Cheng Yu ◽  
Wei Sun ◽  
Karen Scrivener
Keyword(s):  
Sodium Sulfate ◽  
Sulfate Solutions

scholarly journals THE SOLUBILITY OF PHTHALIC ACID IN WATER AND SODIUM SULFATE SOLUTIONS.

1921 ◽  
Vol 43 (5) ◽  
pp. 1205-1207 ◽  
Author(s):  
L. McMaster ◽  
E. Bender ◽  
E. Weil
Keyword(s):  
Sodium Sulfate ◽  
Phthalic Acid ◽  
Sulfate Solutions
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