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파라알데히드

파라알데히드
파라알데히드 구조식 이미지
카스 번호:
123-63-7
한글명:
파라알데히드
동의어(한글):
2,4,6-트리메틸-1,3,5-트리옥산;파라아세트알데히드;파라알데히드;파르알데하이드;파라알데하이드
상품명:
Paraldehyde
동의어(영문):
Pcho;Paral;ALDEHYDE;NSC 9799;FEMA 2003;ALDEFRESH;paradehyde;Elaldehyde;Paraldehyd;Paraldeide
CBNumber:
CB2716567
분자식:
C6H12O3
포뮬러 무게:
132.16
MOL 파일:
123-63-7.mol

파라알데히드 속성

녹는점
12 °C
끓는 점
65-82 °C
밀도
0.994 g/mL at 20 °C (lit.)
증기 밀도
1.52 (vs air)
증기압
25.89 psi ( 55 °C)
굴절률
n20/D 1.39
FEMA
4010 | PARALDEHYDE
인화점
30 °F
저장 조건
2-8°C
용해도
120g/l
산도 계수 (pKa)
16(at 25℃)
물리적 상태
solution
색상
Colorless liquid
Specific Gravity
0.994
냄새
disagreeable taste, aromatic odor
폭발한계
1.3-17.0%(V)
수용성
125 g/L (25 ºC)
Merck
13,7098
BRN
80142
안정성
Stable. Flammable. Incompatible with strong oxidizing agents, mineral acids.
InChIKey
SQYNKIJPMDEDEG-UHFFFAOYSA-N
CAS 데이터베이스
123-63-7(CAS DataBase Reference)
NIST
Paraldehyde(123-63-7)
EPA
Paraldehyde (123-63-7)
안전
  • 위험 및 안전 성명
  • 위험 및 사전주의 사항 (GHS)
위험품 표기 F
위험 카페고리 넘버 11-R11-10
안전지침서 9-16-29-33-S9-S33-S29-S16
유엔번호(UN No.) UN 1993 3/PG 2
WGK 독일 1
RTECS 번호 YK0525000
자연 발화 온도 235 °C
위험 등급 3.2
포장분류 III
HS 번호 29125000
유해 물질 데이터 123-63-7(Hazardous Substances Data)
독성 LD50 orally in rats: 1.65 g/kg (Figot)
기존화학 물질 KE-34698
그림문자(GHS):
신호 어: Warning
유해·위험 문구:
암호 유해·위험 문구 위험 등급 범주 신호 어 그림 문자 P- 코드
H226 인화성 액체 및 증기 인화성 액체 구분 3 경고
예방조치문구:
NFPA 704
3
2 1

파라알데히드 C화학적 특성, 용도, 생산

개요

Paraldehyde was first synthesized in 1829 by Wildenbusch and introduced into clinical practice in the United Kingdom by the Italian physician Vincenzo Cervello in 1882. Paraldehyde, a polymer of acetaldehyde, is a clear colorless or slightly yellow transparent liquid with a strong aromatic as well as a disagreeable taste that at low temperatures, it solidifies into a crystalline mass. This agent decomposes with strong into toxic products that may be released into water, soil, or atmosphere.

화학적 성질

Colourless to yellowish clear liquid

화학적 성질

Paraldehyde is a colorless liquid. Pleasant, sweet odor.

화학적 성질

Paraldehyde has a characteristic aromatic odor and warm, but disagreeable burning taste.

용도

Paraldehyde is used as solvent for fats, oils, waxes, rubber and resins; as substitute for acetaldehyde; as intermediate for organic chemicals, dyestuffs, accelerators for vulcanizations, rubber oxidants, etc. Product Data Sheet

용도

Reactant involved in:• ;Modified Sanford reaction1• ;Synthesis of N-arylbenzoquinaldinium derivatives with antimicrobial activity2• ;Hydroformylation of alkenylamines3• ;Studies of molecules with inhibitory activity against HIV-1 integrase4• ;Irregular Wittig reactions for the formation of α-hydroxyketones5

용도

manufacture of organic compounds.

정의

ChEBI: A trioxane that is 1,3,5-trioxane substituted by methyl groups at positions 2, 4 and 6.

제조 방법

Prepared by the polymerization of acetaldehyde catalyzed by hydrochloric acid and sulfuric acid at medium to high temperatures.

상표명

Paral (Forest).

Aroma threshold values

Recognition at 0.02 to 0.025 mg/m3 (air).

일반 설명

A clear colorless liquid with a pleasant odor. Flash point 96°F. Melting point 54°F. Less dense than water. Vapors are heavier than air.

일반 설명

Paraldehyde, 2,4,6-trimethyl-strioxane,paracetaldehyde, is recognizable as the cyclictrimer of acetaldehyde. It is a liquid with a strong characteristicodor detectable in the expired air and an unpleasanttaste. These properties limit its use almost exclusively toan institutional setting (e.g., in the treatment of deliriumtremens). In the past, when containers were opened and airadmitted and then reclosed and allowed to stand, fatalitiesoccurred because of oxidation of paraldehyde to glacialacetic acid.

공기와 물의 반응

Highly flammable. Slightly soluble in water. Decomposed by light and air, on prolonged storage, to acetaldehyde and acetic acid.

반응 프로필

Paraldehyde is an aldehyde. Paraldehyde is decomposed by light and air, on prolonged storage, to acetaldehyde and acetic acid. Incompatible with alkalis, hydrocyanic acid iodides and oxidizers.

건강위험

INHALATION AND INGESTION: Irritation, headache, bronchitis, pulmonary edema. Irritating to digestive tract. Hypnotic and analgesic properties. Incoordination and drowsiness, followed by sleep. Larger doses-coma-weak pulse and shallow respiration, cyanosis-death from respiratory paralysis. EYES: irritation-can cause serious injury. SKIN: Dermatitis (skin inflammation).

Safety Profile

A human poison by rectal route. Moderately toxic to humans by intramuscular route. Moderately toxic experimentally by inhalation, ingestion, intraperitoneal, and subcutaneous routes. Human systemic effects by rectal route: necrotic changes. A skin and severe eye irritant. Low doses produce hypnotic and analgesic effects. Larger doses depress the nervous system with loss of reflexes, coma, and respiratory depression leadmg to respiratory paralysis and death. Chronic effects include weight loss, muscular weakness, and mental fatigue. However, poisoning is rare. A hypnotic agent. Dangerous fire hazard when exposed to heat, flame, or oxidzers. Slight explosion hazard when exposed to heat or flame. Dangerous; keep away from heat and open flame. To fight fire, use alcohol foam, CO2, dry chemical. Potentially violent reaction with nitric acid. Incompatible with alkahes, hydrocyanic acid, iodides, oxidzers. When heated to decomposition it emits acrid smoke and irritating fumes. See also ALDEHYDES

Chemical Synthesis

Paraldehyde, 2,4,6-trimethyl-1,3,5-trioxane (4.3.2), is a trimeric acetaldehyde which is synthesized by the acid-catalyzed polymerization of acetaldehyde and at moderate and high temperatures [32,33].

잠재적 노출

Paraldehyde is used primarily in medicine. It is used as a hypnotic agent, in delirium tremens; and in treatment of psychiatric states characterized by excitement when drugs must be given over a long period of time. It also is administered for intractable pain which does not respond to opiates and for basal and obstetrical anesthesia. It is effective against experimentally induced convulsions and has been used in emergency therapy of tetanus, eclampsia, status epilepticus; and poisoning by convulsant drugs. Since it is used primarily in medicine, the chance of accidental human exposure or environmental contamination is low. However, paraldehyde decomposes to acetaldehyde and acetic acid; these compounds have been found to be toxic. In this case, occupational exposure or environmental contamination is possible. Since paraldehyde is prepared from acetaldehyde by polymerization in the presence of an acid catalyst, there exists a potential for adverse effects, although none have been reported in the available literature. It is also used in the manufacture of organic compounds.

환경귀착

Paraldehyde is used in resin manufacture, as a preservative, and in other processes as a solvent. Paraldehyde may enter to the environment via industrial effluents or hospital wastes. Acetaldehyde and acetic acid are two products of degradation of paraldehyde. This compound and its degradation products may be released into water, soil, or atmosphere and then they may be removed from the atmosphere by precipitation.

운송 방법

UN1264 Paraldehyde, Hazard Class: 3; Labels: 3-Flammable liquid.

Purification Methods

Wash paraldehyde with water and fractionally distil it. Alternatively, it is purified by drying with anhydrous Na2SO4, then cooled to 5o, and the frozen material is separated by decantation. The solid is distilled (b 121-124o/atm), the distillate is collected, stored over anhydrous Na2SO4 for several days and re-distilled at atmospheric pressure before use [Le Fevre et al. J Chem Soc 290 1950]. The 2r,4c,6t-trimethyl-1,3,5-trioxane has m 14.5o, b 125o/760mm. [Beilstein 19 II 394, 19 III/IV 4715. 19/9 V 112.]

비 호환성

Vapor or liquid may form explosive mixture with air. Incompatible with strong oxidants, strong acids; alkalis, ammonia, amines, iodides, hydrocyanic acid. Violent reaction with liquid oxygen. Contact with acids form acetaldehyde. Attacks rubber and plastics.

폐기물 처리

Incineration in added solvent. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal.

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