chkhz21r
Azodicarbonamide
CAS: 123-77-3
Molecular Formula: C2H4N4O2
chkhz21r - Names and Identifiers
| Name | Azodicarbonamide |
| Synonyms | az abfa chkhz21 chkhz21r ficelep-a celogenaz celosenaz genitronac celogenaz199 celogenaz130 Azodiformamide azodicarboamide AZODICARBOXAMIDE Azodicarboxamide Azodicarbonamide AC Blowing agent DICARBAMOYLDIMIDE azobiscarbonamide azobiscarboxamide delta(1,1')-biurea 1,1'-azodiformamide 1,1'-Azodiformamide 1,1'-azodiformamide 1,1-Azobisformamide 1,1'-azobis-formamid 1,1'-azobiscarbamide Diazenedicarboxamide 1,1'-azobis-formamid 1,1'-azobisformamide 1,1'-azobiscarbamide diazene-1,2-dicarboxamide (E)-diazene-1,2-dicarboxamide (2E)-tetraaz-2-ene-1,4-dicarboxamide |
| CAS | 123-77-3 |
| EINECS | 204-650-8 |
| InChI | InChI=1/C2H4N4O2/c3-1(9)5-7-8-6-2(4)10/h(H3,3,5,8,9)(H3,4,6,7,10) |
| InChIKey | XOZUGNYVDXMRKW-AATRIKPKSA-N |
chkhz21r - Physico-chemical Properties
| Molecular Formula | C2H4N4O2 |
| Molar Mass | 116.08 |
| Density | 1.65 |
| Melting Point | 220-225°C (dec.)(lit.) |
| Boling Point | 217.08°C (rough estimate) |
| Flash Point | 225°C |
| Water Solubility | SOLUBLE IN HOT WATER |
| Solubility | water: soluble0.033g/L at 20°C |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | Solid |
| Color | Orange-red powder or crystals |
| Merck | 14,919 |
| BRN | 1758709 |
| pKa | 14.45±0.50(Predicted) |
| Storage Condition | Flammables area |
| Stability | Highly flammable. Incompatible with strong oxidizing agents, strong acids, strong bases, heavy metal salts. |
| Refractive Index | 1.4164 (estimate) |
| Physical and Chemical Properties | Density 1.65 melting point 220-225°C (dec.) WATER-SOLUBLE solution IN HOT WATER |
| Use | Widely used for foaming of polyvinyl chloride, polyethylene, polypropylene, ABS resin and rubber |
chkhz21r - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R42 - May cause sensitization by inhalation R44 - Risk of explosion if heated under confinement |
| Safety Description | S22 - Do not breathe dust. S24 - Avoid contact with skin. S37 - Wear suitable gloves. |
| UN IDs | UN 3242 4.1/PG 2 |
| WGK Germany | 1 |
| RTECS | LQ1040000 |
| HS Code | 29270000 |
| Hazard Class | 4.1 |
| Packing Group | II |
| Toxicity | LD50 oral in rat: > 6400mg/kg |
chkhz21r - Upstream Downstream Industry
| Raw Materials | Sodium hypochlorite Biurea Sulfuric acid Chlorine Sodium Chlorate Urea Sodium hydroxide hydrazine hydrate |
chkhz21r - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| identification test | sample 35rag is taken and dissolved in 1000ml of water. the maximum ultraviolet absorption of the solution is at 245nm. |
| content analysis | accurately weigh about 225mg of the sample after vacuum drying at 50 ℃ for 2 hours, and put it into a 250ml vitreous iodine measuring flask. Add about 23ml of dimethyl sulfoxide, wash off the sample that may be attached to the wall, add plug, and put 2ml of the solvent around the plug. Rotate occasionally until the sample is completely dissolved. Remove the stopper and allow the remaining solvent to flow into the flask along with the sample that may dissolve. Wash the human flask with 5.0g of potassium iodide with 15ml of water, then immediately suck 10ml of 0.5mol/L hydrochloric acid and move it into the flask, and quickly plug the lid. Shake the bottle until potassium iodide is completely dissolved, then let stand for 20-25min in the dark, titrate with 0.1mol/L sodium thiosulfate until the yellow of the precipitated iodine disappears, and if yellow reappears within 15min, then titrate with sodium thiosulfate to colorless. Another 25ml dimethyl sulfoxide, 5.0g potassium iodide, 15ml water and 5 mL0.5mol/L hydrochloric acid were taken for blank test. 0.1mol/L sodium thiosulfate per ml is equivalent to 5.804mg of azoformamide (C2H4N402). |
| toxicity | can be safely used in food (FDA, 172.806,2000). ADI 0~45(FAO/WHO,2001). |
| usage limit | GB 2760-1996: wheat flour 0.045 g/kg. FAO/WHO,1965:45 mg/kg wheat flour. Japan, 1999: cereal flour, bread dough, 45 mg/kg. |
| use | wheat flour treatment agent; Fast starter for baked goods. Safe and rapid oxidation of wheat flour can be completed at low dosage to improve the physical properties of the dough and the tissue structure required for high-gluten dough. as flour treatment agent, China stipulates that it can be used for wheat flour with a maximum usage of 0.045 g/kg. Universal foaming agent with large gas generation capacity. Widely used in polyvinyl chloride, polyethylene, ethylene-vinyl acetate copolymer, polypropylene, polystyrene, ABS, nylon -6 and neoprene and other synthetic materials, so far there is no competitive product. In these application fields, polyethylene accounts for 25-30% and polyvinyl chloride for 15-20%. Widely used in the foaming of polyvinyl chloride, polyethylene, polypropylene, ABS resin and rubber |
| production method | industrial production foaming agent AC, which is synthesized from hydrazine hydrate, urea and sulfuric acid to synthesize intermediate diurea, and then oxidized to obtain the finished product. 1. Condensation Dissolve urea in 2% hydrazine hydrate solution and add it to the reaction pot. Add sulfuric acid under stirring to make the pH value of the feed liquid reach 1-2, heat to change the pH value to 2-5, then slowly add sulfuric acid, keep the pH value of 2-5 for several hours, and then take samples to determine the end point (titrate the hydrazine content with 0.1N iodine solution). The diurea synthesized by shrinkage, after filtering out the ammonium sulfate mother liquor, is washed with hot water for oxygen supply. 2. Oxidation Put biurea into the reaction pot to dissolve with water, add sodium bromide, and pass in chlorine. The reaction temperature is controlled at 30-50 ℃. The prepared azodicarbonamide is first washed to neutral with warm water, and dried by a centrifuge. After drying, the finished product is obtained. The oxidation process has the greatest impact on the product quality and production cost of foaming agent AC. The early use of nitric acid and chromic acid methods has tended to be eliminated due to cost and pollution. Chlorine-bromine is used as an oxidant to replace chromium salt oxidation of biurea to produce blowing agent AC, which reduces the product cost a lot. Other methods include: air and nitrogen dioxide treatment of biuret with a yield of 84.3%; Production of foaming agent AC by electrolysis; Hydrogen peroxide is used to oxidize biuret. Raw material consumption quota: hydrazine hydrate (40%)1160 kg/t, urea (nitrogen content ≥ 46%)1330 kg/t, liquid chlorine 800 kg/t, caustic soda (30%)2000 kg/t, sulfuric acid (98%)1140 kg/t. dissolve urea in 2% hydrazine hydrate solution, stir, and add sulfuric acid to make the Ph value reach 1-2, then heat to make the Ph value 2-5, then slowly add sulfuric acid to keep the Ph value 2-5, take samples to determine the end point after several hours of reaction; After the reaction, filter to remove ammonium sulfate mother liquor, and wash with hot water to obtain diurea. Dissolve diurea in water, add sodium bromide, pass chlorine, and react at 30~50 ℃; the reaction mixture is washed with warm water to be neutral, and then centrifuged to dry and dry to obtain the finished product. Each ton of product consumes 1160kg of hydrazine hydrate (40%), 1330kg of urea, 800kg of liquid chlorine, 2000kg of caustic soda (30%) and 1140kg of sulfuric acid (98%). It is synthesized by hydrazine and urea in the presence of chlorine or sulfuric acid. |
| category | flammable solids |
| toxicity classification | low toxicity |
| acute toxicity | oral-rat LD50; >6400 mg/kg |
| explosive hazard characteristics | low allergic agent |
| flammability hazard characteristics | flammability; combustion produces toxic nitrogen oxide smoke |
| storage and transportation characteristics | ventilation and low temperature drying |
| fire extinguishing agent | dry powder, foam, sand, carbon dioxide, mist water |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 15:16:47
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Raw Materials for chkhz21r