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22036
SCD
Sodium Citrate Dihydrate
Citric Acid Trisodium Salt Dihydrate
6132-04-3
294.1
C6H5Na3O7.2H2O
200-675-3
29181500
Appearance: white crystalline powder.
Relationship / difference between sodium citrate Anhydrous and sodium citrate dihydrate:
The only difference is there are 2 crystal water molecule in sodium citrate dihydrate, there is almost no difference in chemical features and applications.
Physical and Chemical data:
| Melting Point | Dehydrate Point | Density (g/m3) |
| 300ºC | 150ºC | 1.76 |
Other Related indexes:
| EINECS | RTECS | PubChem | MDL |
| 200-675-3 | GE7810000 | 24899497 | MFCD00150031 |
Solubility: soluble in water (720g/L at 25), not soluble in alcohol.
Characteristic:
1. Big solubility in water, alcohol and ether;
2. Water softening ability, it can combine the Ca2+ and other metal ions (except for alkali metal), and for the compounds (like Calcium citrate), their solubility in cold water is higher than hot water, which is a big advantage in detergent industry;
3. pH buffering ability;
4. Low toxic.
Main indexes:
| Index | Standard |
| Assay by wt % | 99.0~101.0 |
| Identification test | Pass |
| Clarity and color test of solution | Pass |
| Readily carbonized substances test | Pass |
| Acidity or alkalinity test | Pass |
| Arsenic by ppm | 1 max |
| Lead (Pb) by ppm | 1 max |
| Chlorides by ppm | 50 max |
| Sulphates by ppm | 150 max |
| Oxalates by ppm | 100 max |
| Heavy metal by ppm | 5 max |
| Mercury by ppm | 1 max |
| Water content by wt % | 11~13 |
| pH (5% water solu.) | 7.0~9.0 |
1. Food industry as acidity modifier;
2. Detergent industry as water softener and auxiliary;
3. Cosmetics;
4. Chemical industry and etc.
Function and application in food industry:
1. As color fixative for fresh vegetables and fruits ( 1% CAM + 1~2% sodium chloride solution);
2. As pH buffering agent and modifiers in various mass production food;
3. As antioxidant in the mass processing of many food;
4. As modifier when combined with sodium bicarbonate in wheaten food;
5. As flavor and smell-remover in salted food and cans.
Function in detergent industry:
Replacing STPP to soften water with the following advantages:
1. Environmental friendly with good bi-degradation;
2. Better safety in dish washing and other related detergents which can enter human organs easily;
3. Good chelating ability, not only to Ca2+, Mg2+ but also to other non-alkali metal ions, and the solubility of these chelated salts in cold water is bigger than hot water;
4. Better solubility than STPP, Zeolite;
5. Good pH buffering ability;
6. Rust inhibiting ability which is good for the related equipments and pipes;
7. Thickening agent in liquid detergent system.
We normally list 2 years as the shelf life in our COA, the real shelf life can be slightly longer than 2 years if it's stocked in good condition (bags are sealed enough, away from direct sun-light, moisture and other incompatible chemical materials).
Appearance: white crystalline powder.
Relationship / difference between sodium citrate Anhydrous and sodium citrate dihydrate:
The only difference is there are 2 crystal water molecule in sodium citrate dihydrate, there is almost no difference in chemical features and applications.
Physical and Chemical data:
| Melting Point | Dehydrate Point | Density (g/m3) |
| 300ºC | 150ºC | 1.76 |
Other Related indexes:
| EINECS | RTECS | PubChem | MDL |
| 200-675-3 | GE7810000 | 24899497 | MFCD00150031 |
Solubility: soluble in water (720g/L at 25), not soluble in alcohol.
Characteristic:
1. Big solubility in water, alcohol and ether;
2. Water softening ability, it can combine the Ca2+ and other metal ions (except for alkali metal), and for the compounds (like Calcium citrate), their solubility in cold water is higher than hot water, which is a big advantage in detergent industry;
3. pH buffering ability;
4. Low toxic.
Main indexes:
| Index | Standard |
| Assay by wt % | 99.0~101.0 |
| Identification test | Pass |
| Clarity and color test of solution | Pass |
| Readily carbonized substances test | Pass |
| Acidity or alkalinity test | Pass |
| Arsenic by ppm | 1 max |
| Lead (Pb) by ppm | 1 max |
| Chlorides by ppm | 50 max |
| Sulphates by ppm | 150 max |
| Oxalates by ppm | 100 max |
| Heavy metal by ppm | 5 max |
| Mercury by ppm | 1 max |
| Water content by wt % | 11~13 |
| pH (5% water solu.) | 7.0~9.0 |
1. Food industry as acidity modifier;
2. Detergent industry as water softener and auxiliary;
3. Cosmetics;
4. Chemical industry and etc.
Function and application in food industry:
1. As color fixative for fresh vegetables and fruits ( 1% CAM + 1~2% sodium chloride solution);
2. As pH buffering agent and modifiers in various mass production food;
3. As antioxidant in the mass processing of many food;
4. As modifier when combined with sodium bicarbonate in wheaten food;
5. As flavor and smell-remover in salted food and cans.
Function in detergent industry:
Replacing STPP to soften water with the following advantages:
1. Environmental friendly with good bi-degradation;
2. Better safety in dish washing and other related detergents which can enter human organs easily;
3. Good chelating ability, not only to Ca2+, Mg2+ but also to other non-alkali metal ions, and the solubility of these chelated salts in cold water is bigger than hot water;
4. Better solubility than STPP, Zeolite;
5. Good pH buffering ability;
6. Rust inhibiting ability which is good for the related equipments and pipes;
7. Thickening agent in liquid detergent system.
We normally list 2 years as the shelf life in our COA, the real shelf life can be slightly longer than 2 years if it's stocked in good condition (bags are sealed enough, away from direct sun-light, moisture and other incompatible chemical materials).
