말레산 무수물

개요말레산 무수물(MA)은 매우 불쾌한 냄새를 지닌 무색 액체입니다. 이것은 원료인 벤젠 또는 노멀부탄으로 구성된 화학적 중간 생성물입니다. 그 다운스트림 제품으로는 푸마르산, 말산과 숙신산 및 부탄디올이 있습니다. 이 제품들은 하나의 통합된 제조 과정을 통해 생산됩니다. 말레산 무수물은 액체와 고체 형태(파스틸, 브리케트 또는 플레이크)로 존재합니다.

용도말레산 무수물의 대표적인 사용 영역을 보면, 불포화 폴리에스터 수지(UPR)의 제조가 전체의 약 50%를 차지합니다. 또한 용제, 접착제, 윤활제, 세제, 표면처리 첨가제 및 염료의 제조 시에도 사용됩니다.

개요Maleic Anhydride (MAN) is an organic compound with the chemical formula C4H203. It is the acid anhydride of maleic acid and in its pure state it is a colourless or white solid with an acrid odour. Maleic anhydride is truly a remarkable molecule in that it possesses two types of chemical functionality making it uniquely useful in chemical synthesis and applications.Maleic Anhydride is a multifunctional chemical intermediate with applications in several fields of chemical industry. Its major end use is as feedstock in the production of unsaturated polyester resins (UPR).These resins are used both in glass-reinforced and in unreinforced applications. The UPR end uses includes a wide range of applications in construction, marine and automobile industries.

용도Maleic Anhydride is heterocyclic compound used in the manufacture of unsaturated polyester resins. It has a wide range of other applications; it is used in synthetic tensides, insecticides, herbicides and fungicides.

일반 설명Colorless crystalline needles, flakes, pellets, rods, briquettes, lumps or a fused mass. Melts at 113°F. Shipped both as a solid and in the molten state. Vapors, fumes and dusts strong irritate the eyes, skin and mucous membranes. Flash point 218°F. Autoignition temperature 890°F. Used to make paints and plastics and other chemicals.

To a flask equipped with a Dean-Stark trap, condenser, and mechanical stirrer is added 116 gm (1.0 mole) of maleic acid and 120 ml of tetrachloroethane. The contents are heated, the water (18 ml, 1.0 mole) distilled off as the azeotrope, and the residue distilled under reduced pressure to afford 87.7 gm (89.5%) of the anhydride, b.p. 82-84°C (15 mm), m.p. 53°C. The residue remaining in the flask consists of about 10 gm of fumaric acid, m.p. 287°C. Fumaric and maleic acids both give maleic anhydride on heating. Fumaric acid must first be heated to a higher temperature to effect its conversion to maleic acid prior to its dehydration.

생산 방법Maleic anhydride was traditionally manufactured by the oxidation of benzene or other aromatic compounds. As of 2006, only a few smaller plants continue to use benzene; due to rising benzene prices, most maleic anhydride plants now use n-butane as a feedstock. In both cases, benzene and butane are fed into a stream of hot air, and the mixture is passed through a catalyst bed at high temperature. The ratio of air to hydrocarbon is controlled to prevent the mixture from catching on fire. Vanadium pentoxide and molybdenum trioxide are the catalysts used for the benzene route, whereas vanadium and phosphorus oxides are used for the butane route. 2 CH3CH2CH2CH3 + 7 O2 → 2 C2H2(CO)2O + 8 H2O.