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파라-톨룰일산

파라-톨룰일산
파라-톨룰일산 구조식 이미지
카스 번호:
99-94-5
한글명:
파라-톨룰일산
동의어(한글):
P-토루산;파라-톨룰일산;P-토루산
상품명:
p-Toluic acid
동의어(영문):
PTLA;p-toluic;p-Toluylsure;P-TOLUIC ACID;4-TOLUIC ACID;P-TOLUYLIC ACID;Crithminic acid;para-Toluic acid;P-ToluicAcid>98%;p-carboxytoluene
CBNumber:
CB7854776
분자식:
C8H8O2
포뮬러 무게:
136.15
MOL 파일:
99-94-5.mol

파라-톨룰일산 속성

녹는점
179 °C
끓는 점
274-275 °C(lit.)
밀도
1,06 g/cm3
증기압
0.02 hPa (70 °C)
굴절률
1.5120 (estimate)
인화점
181°C
저장 조건
Store at RT.
용해도
0.3g/l
물리적 상태
Powder
산도 계수 (pKa)
4.36(at 25℃)
색상
White to slightly yellow-cream
수용성
<0.1 g/100 mL at 19 ºC
Merck
14,9535
BRN
507600
안정성
Stable. Incompatible with strong oxidizing agents, strong bases.
InChIKey
LPNBBFKOUUSUDB-UHFFFAOYSA-N
CAS 데이터베이스
99-94-5(CAS DataBase Reference)
NIST
Benzoic acid, 4-methyl-(99-94-5)
EPA
Benzoic acid, 4-methyl-(99-94-5)
안전
  • 위험 및 안전 성명
  • 위험 및 사전주의 사항 (GHS)
위험품 표기 Xn
위험 카페고리 넘버 22
안전지침서 22-24/25
WGK 독일 1
RTECS 번호 XU1575000
자연 발화 온도 570 °C
TSCA Yes
HS 번호 29163900
독성 LD50 orally in Rabbit: 400 mg/kg
그림문자(GHS):
신호 어: Warning
유해·위험 문구:
암호 유해·위험 문구 위험 등급 범주 신호 어 그림 문자 P- 코드
H303 삼키면 유해할 수 있음 급성 독성 물질 - 경구 구분 5 P312
H315 피부에 자극을 일으킴 피부부식성 또는 자극성물질 구분 2 경고 P264, P280, P302+P352, P321,P332+P313, P362
H319 눈에 심한 자극을 일으킴 심한 눈 손상 또는 자극성 물질 구분 2A 경고 P264, P280, P305+P351+P338,P337+P313P
H335 호흡 자극성을 일으킬 수 있음 특정 표적장기 독성 - 1회 노출;호흡기계 자극 구분 3 경고
예방조치문구:
P261 분진·흄·가스·미스트·증기·...·스프레이의 흡입을 피하시오.
P304+P340 흡입하면 신선한 공기가 있는 곳으로 옮기고 호흡하기 쉬운 자세로 안정을 취하시오.
P305+P351+P338 눈에 묻으면 몇 분간 물로 조심해서 씻으시오. 가능하면 콘택트렌즈를 제거하시오. 계속 씻으시오.
P405 밀봉하여 저장하시오.

파라-톨룰일산 MSDS


p-Toluic acid

파라-톨룰일산 C화학적 특성, 용도, 생산

화학적 성질

colourless crystals or white crystalline powder. Slightly soluble in water; soluble in alcohol and ether. Combustible.

용도

Intermediates of Liquid Crystals

정의

ChEBI: A methylbenzoic acid in which the methyl substituent is located at position 4.

공기와 물의 반응

Fine dust dispensed in air in sufficient concentrations, and in the presence of an ignition source is a potential dust explosion hazard. . Insoluble in water.

반응 프로필

p-Toluic acid is a carboxylic acid. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in p-Toluic acid to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions. p-Toluic acid is incompatible with strong oxidizers. p-Toluic acid is also incompatible with strong bases. .

화재위험

Flash point data for p-Toluic acid are not available; however, p-Toluic acid is probably combustible.

Purification Methods

Crystallise the acid from water, water/EtOH (1:1), MeOH/water or *benzene. [Beilstein 9 IV 1724.] Aromatic acid impurities (to <0.05%) can be removed via the (±)--methylbenzylamine salt as described for 2,4-dichlorobenzoic acid [Ley & Yates Organic Process Research & Development 12 120 2008]. The S-benzylisothiuronium salt has m 164o (from aqueous EtOH).

파라-톨룰일산 준비 용품 및 원자재

원자재

준비 용품


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