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40.00


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Относится к группе простейших диальдегидов. По сути глиоксаль – это диальдегид щавелевой кислоты. Химическая формула – С2Н2О2. Внешний вид – жидкость жёлтого цвета, имеющая запах формалина. Молекулярная масса 40%-ного глиоксаля – 58,04 г/моль. Плотность глиоксаля составляет 1,27 г/см³.


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Нет в наличии


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Категории: , Метки: ,
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Описание

Относится к группе простейших диальдегидов. По сути глиоксаль – это диальдегид щавелевой кислоты. Химическая формула – С2Н2О2. Внешний вид – жидкость жёлтого цвета, имеющая запах формалина. Молекулярная масса 40%-ного глиоксаля – 58,04 г/моль. Плотность глиоксаля составляет 1,27 г/см³.

Существует несколько способов получения глиоксаля:

В промышленности есть два способа:

  • Окисление в жидкой фазе альдегида азотной кислоты.
  • Окисление в газовой фазе этиленгликоля с присутствием медного либо серебряного катализатора.

Второй способ – более распространенный.

В лабораторных условиях глиоксаль получают путём окисления альдегида селенистой кислотой.

Также существует получение безводного глиоксаля, которое включает в себя нагрев твердых глиоксаль-гидратов с фосфора пентаоксидом, а также конденсацию паров в охлаждаемой ловушке.

Применение

Глиоксаль применяют, дабы придать веществу нерастворимость, а также в качестве агента кросс-сочетания в химии следующих полимеров:

— коллаген;

— белки (в процессе дубления кожи);

— гидрокиллоиды;

— производство целлюлозы (в основном, в текстильной промышленности);

— крахмал (в полиграфии – мелование бумаги).

Глиоксаль – это вспомогательное текстильное вещество, которое придает неснимаемость вискозным и хлопчатобумажным тканям. Также глиоксаль как гидрофобилирующий компонент используется в составе для пропитки кожи и бумаги. Глиоксальсульфат и глиоксаль непосредственно применяются для производства кубовых красителей.

В органическом синтезе глиоксаль – ценный строительный блок. В особенности это касается синтеза таких гетероциклов, как имидазол. Простая формула данного реагента, используемого в лабораториях – бис-полуацеталь  с этиленгликолем – 1,4-диоксан-2,3-диол.


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