PRODUCT IDENTIFICATION
H.S. CODE
TOXICITY
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
AUTOIGNITION
NFPA RATINGS
REFRACTIVE INDEX
APPLICATIONS
APPEARANCE
CONTENT
98.0% min
25kgs in drum
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| PYRIDINIUM DICHROMATE | ||
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PRODUCT IDENTIFICATION |
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| CAS NO. | 20039-37-6 |
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| EINECS NO. | 243-478-8 | |
| FORMULA | C10H10N2H2Cr2O7 | |
| MOL WT. | 376.21 | |
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H.S. CODE |
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TOXICITY |
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| SYNONYMS | PDC; Pyridine compound with Chromic acid; | |
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CLASSIFICATION |
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PHYSICAL AND CHEMICAL PROPERTIES |
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| PHYSICAL STATE | yellow granule | |
| MELTING POINT | 152 - 153 C | |
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| SOLUBILITY IN WATER | ||
| pH | ||
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AUTOIGNITION |
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NFPA RATINGS |
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REFRACTIVE INDEX |
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| FLASH POINT |
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| STABILITY | Stable under ordinary conditions. Moisture sensitive | |
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APPLICATIONS |
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| Chromium does not occur by itself in nature but always in compounds. The stable oxidation states of chromium are +6, +3 (most stable), and +2. In industry, chromic acid refers to chromium(Ⅵ) oxide or chromium trioxide (CrO3). This substance decomposes above 250 C to chromic oxide and oxygen. Chromium in the +6 (or Ⅵ) oxidation state (hexavalent chromium) is a strong oxidant and reacts violently with combustible and reducing materials. The solution in water is a strong acid, it reacts violently with bases and is corrosive. In organic synthesis, chromic acid is used to oxidize primary or secondary alcohols to aldehydes (or ketones) by oxidation state change from +6 to +3. It is difficult to stop at the aldehyde stage during the oxidation reaction, which usually proceeds to the carboxylic acid. Chromate oxidizers such as pyridinium chlorochromate are used to stop at the aldehyde group. The stable oxidation states +3 is the most stable. Saturated primary alcohols are oxidized to carboxylic acids in dimethylformamide solution. Jones reagent (sodium dichromate in aqueous sulfuric acid) continues the oxidation to the carboxylic acid product. Chlorochromates are efficient oxidizing agent for alcohols, allylic and benzylic methylene groups, and for oxidative cleavage of aryl substituted olefins. Hexavalent chromium solutions will not oxidize a tertiary alcohol. Chromium Ⅵ compounds have a dark orange to red color while chromium Ⅲcompounds are normally green. In medicinal field, they are used as anti-infective agents | ||
| SALES SPECIFICATION | ||
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APPEARANCE |
yellow granule | |
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CONTENT |
98.0% min |
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| TRANSPORTATION | ||
| PACKING | 25kgs in drum | |
| HAZARD CLASS | ||
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| OTHER INFORMATION | ||
| Hazard Symbols: , Risk Phrases: 49-43-50/53, Safety Phrases: 53-45-60-61 | ||
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