Acetaldehyde tetramer
2,4,6,8-tetramethyl-1,3,5,7-tetraoxacyclooctane
CAS: 108-62-3
Molecular Formula: C8H16O4
Acetaldehyde tetramer - Names and Identifiers
| Name | 2,4,6,8-tetramethyl-1,3,5,7-tetraoxacyclooctane |
| Synonyms | Tetramer Metaldehyde Metacetaldehyde tetraacetaldehyde Acetaldehyde tetramer ACETALDEHYDE TETRAMER Vassgro mini slug pellets Tetramethyl-1,3,5,7-tetroxocane Totroxocane, 2,4,6,8-tetramethyl- 2,4,6,8-tetramethyl-1,3,5,7-tetroxocane 1,3,5,7-Tetroxocane, 2,4,6,8-tetramethyl- 2,4,6,8-tetramethyl-1,3,5,7-tetraoxacyclooctane |
| CAS | 108-62-3 |
| EINECS | 203-600-2 |
| InChI | InChI=1/C8H16O4/c1-5-9-6(2)11-8(4)12-7(3)10-5/h5-8H,1-4H3 |
Acetaldehyde tetramer - Physico-chemical Properties
| Molecular Formula | C8H16O4 |
| Molar Mass | 176.21 |
| Density | 1.27 |
| Melting Point | 246 °C |
| Boling Point | 65°C/15mmHg(lit.) |
| Flash Point | 50°C |
| Water Solubility | 0.02 g/100 mL (20 ºC) |
| Vapor Presure | 6.6Pa at 25℃ |
| Appearance | Fine Crystalline Powder |
| Color | White |
| Storage Condition | Keep in dark place,Sealed in dry,2-8°C |
| Refractive Index | 1.4220 (estimate) |
| Physical and Chemical Properties | Density 1.27 sublimation point 112-115°C flash point 50°C water-soluble 0.02g/100 mL (20°C) |
| Use | Is to kill mollusks, such as snails, slug effects of pesticides, also used as solid fuel |
Acetaldehyde tetramer - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R10 - Flammable R22 - Harmful if swallowed R2017/10/22 - |
| Safety Description | S13 - Keep away from food, drink and animal foodstuffs. S25 - Avoid contact with eyes. S46 - If swallowed, seek medical advice immediately and show this container or label. S2 - Keep out of the reach of children. |
| UN IDs | 1332 |
| RTECS | XF9900000 |
| HS Code | 29125000 |
| Hazard Class | 4.1 |
| Packing Group | III |
Acetaldehyde tetramer - Upstream Downstream Industry
| Raw Materials | Acetaldehyde |
Acetaldehyde tetramer - Reference Information
| sublimation point | 112-115°C |
| LogP | 0.12 at 20℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | tetramethylacetaldehyde is a pure white powder, which is off-white or light yellow powder for industrial use. It has the smell of bad eggs and is difficult to dissolve in water, insoluble in most organic solvents, but soluble in pyridine, light, heat, humidity is not stable, easy to decompose carbon disulfide, alkaline substances or copper, mercury and other substances are easy to decompose and release carbon disulfide and reduce the effect, volatile small. The so-called protection is to provide Zn Elements for plants, in addition to solving the symptoms of zinc deficiency, to enhance the ability of plants to resist diseases, so as to relatively play a bactericidal role. |
| preparation | in a 1000 liter reactor, 0 °c acetaldehyde 560kg, add about 40kg of ether to cool to -15 °c, and prepare the acid catalyst: Hydrochloric acid about 4kg, ether about 1kg, pyridine about 1kg, sodium bromide ( 0.5) and hydroxylamine hydrochloride (0.3) were added into the polymerization vessel under constant stirring and cooling, and the addition rate of acidic catalyst was observed under temperature control in the polymerization vessel, the polymerization reaction temperature in the polymerization reactor is not more than 0 ℃, after the acidic catalyst is added, continuous stirring and cooling to maintain the temperature in the polymerization reactor at -10 ℃ ~-5 ℃ for about 3 hours, can be discharged from the polymerization reactor filter, the solid matter is washed with water, after drying, white crystalline tetramethylacetaldehyde can be obtained. The filtrate is sent to the distillation kettle for heating, sulfuric acid is added as a catalyst, the tripolyacetaldehyde in the filtrate is depolymerized, the top temperature of the depolymerization column is controlled at 20 ℃ and 21 ℃, and acetaldehyde and ether are distilled and separated, prepare for the next feeding. |
| Use | tetramethylacetaldehyde is a neurotoxicant that is toxic to the poison pathway and stomach of slug and snail, its contact-killing effect is stronger than that of gastric toxicity. Inorganic pesticides, such as calcium arsenate and Paris Green, substituted by tetramethylacetaldehyde played an important role in the prevention and treatment of snail and slug. It is an effective pesticide for killing mollusks, such as snails and slug, and is also used as a solid fuel |
| production method | the product can be prepared by acetylene hydration or acetaldehyde polymerization in the presence of a catalyst. |
| category | pesticide |
| toxicity grade | high toxicity |
| Acute toxicity | oral-rat LD50: 227 mg/kg; Oral-mouse LD50: 200 mg/kg |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored and transported separately from food raw materials |
| extinguishing agent | dry powder, foam, sand |
| Occupational Standard | SEL 0.2 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for Acetaldehyde tetramer