산화 메시틸

산화 메시틸 속성

산화 메시틸 C화학적 특성, 용도, 생산

개요

The commercial grade of 4-methyl-3-penten-2-one exhibits an unpleasant grassy-green or pungent, acrylic odor. The pure material has a pleasant, honey-like odor. This substance may be prepared by reacting acetone or diacetone alcohol with iodine or other dehydrating agent; by condensation of acetone over sulfonated polystyrene-divinylbenzene resin used as an ion exchange catalyst.

화학적 성질

Mesityl oxide is a clear, pale yellow, or colorless liquid with a strong peppermint odor. The odor threshold is 0.05 ppm.

물리적 성질

Clear, pale yellow liquid with a strong, peppermint, or honey-like odor. Experimentally determined detection and recognition odor threshold concentrations were 70 μg/m³ (17 ppb_v) and 200 μg/m³ (50 ppb_v), respectively (Hellman and Small, 1974).

출처

Reported found in orange juice, baked potato, bell pepper, sauerkraut, tomato, crisp bread, parmesan cheese, milk, chicken fat, hop oil, rum, coffee, tea, peanut, passion fruit, mushroom, tamarind, prickly pear, buckwheat, basil, elder flower, rosemary, shrimp, nectarine, clam and maté

용도

4-Methyl-4-penten-2-one is used to a small extent as an intermediate in synthesis. Most of it is converted to 4-methyl-2-pentanone by selective hydrogenation. Although 4-methyl-2- pentanone has excellent solvent properties for nitrocellulose, cellulose esters and ethers, copolymers of vinyl chloride – vinyl acetate and other synthetic resins, as well as natural and synthetic rubber, its use as a solvent is limited as a result of its toxicity and chemical instability. The fraction of 4-methyl-4-penten-2-one permitted in solvent systems has been set at 5 vol% (Rule 66 of the Los Angeles, California, Air Pollution Control District). Some of the numerous possible reactions that mesityl oxide may undergo have been used for the synthesis of products such as Budralazine, an antihypertensive agent.

제조 방법

4-Methyl-4-penten-2-one is the precursor of methyl isobutyl ketone (see Section 2.2) and can be produced from acetone in a single- or a two-step process . Pure mesityl oxide is obtained by azeotropic distillation of the crude watercontaining product. Subsequent purification by removal of the accompanying impurities, such as mesitylene and phorone [504-20-1], is effected by distillation.

일반 설명

Mesityl oxide appears as a colorless, oily liquid with a pungent honey-like odor. Flash point 87 °F. Less dense than water and slightly soluble in water. Vapors heavier than air. Used in paint removers, as a solvent for plastics, and as an insect repellent.

공기와 물의 반응

Highly flammable. Slightly soluble in water

반응 프로필

Mixing MESITYL OXIDE in equal molar proportions with any of the following substances in a closed container caused the temperature and pressure to increase: 2-aminoethanol, chlorosulfonic acid, ethylene diamine, nitric acid, oleum, or sulfuric acid [NFPA 1991].

위험도

Flammable, moderate fire risk. Toxic by ingestion, inhalation, and skin absorption. Eye and upper respiratory tract irritant, central nervous system impairment.

건강위험

Mesityl oxide is a moderately toxic substance, more toxic than the saturated ketones.Inhalation of its vapors can cause irritationto the eyes, skin, and mucous membranes. Inhumans, the irritation effect on the eyes andnose are reported to be 25 and 50 ppm. Athigh concentrations narcosis can result. Otherthan narcosis, prolonged exposure to highconcentrations can injure the lungs, liver, and kidney. A concentration of 2500 ppm waslethal to rats.
LD50 value, oral (rats): 1120 mg/kg.

화재위험

Behavior in Fire: Vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back.

Safety Profile

Poison by intraperitoneal route. Moderately toxic by ingestion. Mildly toxic by inhalation and skin contact. Human systemic effects by inhalation: conjunctiva irritation. This compound is highly irritating to all tissues on contact; its vapors also are irritating. High concentrations are narcotic. It is readdy absorbed through intact skin. Single exposures tend to indicate that ths ketone has greater acute and narcotic action than isophorone. It can have harmful effects upon the hdneys and liver, and may damage the eyes and lungs to a serious degree. Prolonged exposure can injure liver, kidneys, and lungs. It can cause opaque cornea, keratoconus, and extensive necrosis of cornea. Dangerous fire hazard when exposed to heat, sparks, or flame; can react with oxidzing materials. Reacts violently with 2-amino ethanol, chlorosulfonic acid, ethylene diamine, HNO3, oleum, H2SO4. An insect repellent. To fight fire, use alcohol foam, CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes. See also KETONES.

잠재적 노출

Mesityl oxide is used as a solvent for cellulose esters and ethers and other resins in lacquers and inks. It is used in paint and varnish removers and as an insect repellent

운송 방법

UN1229 Mesitly oxide, Hazard Class: 3; Labels: 3-Flammable liquid.

Purification Methods

Purify it by distillation, preferably in a vacuum or via the semicarbazone (m 165o) which is decomposed to pure ketone. The 2,4-dinitrophenylhydrazone (m 205-206o) crystallises from EtOH. [Johnson J Am Chem Soc 73 5888 1951, Johnson J Am Chem Soc 75 2720 1953, Erskine & Waight J Chem Soc 3425 1960, Beilstein 1 H 736, 1 I 382, 1 II 793, 1 III 2995, 1 IV 3471.]

비 호환성

May form explosive mixture with air. May be able to form explosive peroxides. May react violently with nitric acid; aliphatic amines; alkanolamines, 2- aminoethanol, ethylene diamine; chlorosulfonic acid; oleum (fuming sulfuric acid). Not compatible with oxidizers, strong acids; strong bases; reducing agents; halogens. Dissolves some forms of plastics, resins and rubber. Attacks copper.

폐기물 처리

Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.

산화 메시틸 준비 용품 및 원자재

원자재

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산화 메시틸 공급 업체

공급자	전화	이메일	국가	제품 수	이점
Shanxi Naipu Import and Export Co.,Ltd	+86-13734021967 +8613734021967	kaia@neputrading.com	China	1011	58
Henan Tianfu Chemical Co.,Ltd.	+86-0371-55170693 +86-19937530512	info@tianfuchem.com	China	21691	55
Shanghai Time Chemicals CO., Ltd.	+86-021-57951555 +8617317452075	jack.li@time-chemicals.com	China	1807	55
Hangzhou FandaChem Co.,Ltd.	008657128800458; +8615858145714	fandachem@gmail.com	China	9348	55
career henan chemical co	+86-0371-86658258	sales@coreychem.com	China	29914	58
SHANDONG ZHI SHANG CHEMICAL CO.LTD	+86 18953170293	sales@sdzschem.com	China	2931	58
Hubei Jusheng Technology Co.,Ltd.	18871490254	linda@hubeijusheng.com	CHINA	28180	58
Henan Xiangtong Chemical Co., Ltd.	86-371-61312303	info@hnxtchem.com	CHINA	292	58
Hubei xin bonus chemical co. LTD	86-13657291602	linda@hubeijusheng.com	CHINA	22968	58
Standardpharm Co. Ltd.	86-714-3992388	overseasales1@yongstandards.com	United States	14336	58

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