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Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 3. Отображено 3.
12-02-2014 дата публикации

Preparation method of polycarbonate

Номер: CN103570931A
Автор: QIU DEYUE, ZANG YANGLING, LIU GUOWEN, WANG XIAOGUANG, HUANG MINGZHI, MAO CHUNHUI, LIAO LANGUI, YANG MEI, HUANG YOUYUAN, ZHOU JINPING, WANG YAN, WANG ZHIKAI
Принадлежит:

The invention discloses a preparation method of polycarbonate (PC). The preparation method comprises the following steps of: reacting alkali liquor, bisphenol A (also called BPA), a molecular weight regulator and sodium sulfite along with agitating to generate a BPA alkali salt; adding an active reaction substance, namely, 4-hydroxybenzyl chloride or p-hydroxylbenzyl quaternary ammonium salt, to pre-polymerize with a phosgene solution to obtain a prepolymer; adding alkali liquor to perform condensation polymerization to obtain the PC with molecular weight of 5000 to 100000, wherein if the active reaction substance is 4-hydroxybenzyl chloride, tertiary amine is added first during the condensation polymerization. According to the preparation method, the molecular weight and the molecular weight distribution of PC can be controlled through the ratio of the added molecular weight regulator; the active reaction substance is added during the pre-polymerization, and thus a polymer containing quaternary ...

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Номер записи: 1
04-03-2015 дата публикации

Preparation method of methyl isocyanate

Номер: CN104387295A
Автор: JIANG ZHUOLIANG, WANG XIAOGUANG, LIAO LANGUI, YU HUI, CHEN MENGCI
Принадлежит:

The invention provides a preparation method of methyl isocyanate. A reaction product synthesized at the high temperature is directly fed into a first organic solvent for treatment at the temperature of 200-300 DEG C, effective separation of the methyl isocyanate and hydrogen chloride is realized, the fact that the methyl isocyanate reacts with the hydrogen chloride to produce methyl carbamyl chloride is avoided, the once-through yield of the methyl isocyanate is increased, repeated heating and condensation are not required, energy consumption and production of by-products are reduced, meanwhile, multiple decomposition reactors are not required and the number of condensers is decreased in the aspect of devices, and the investment cost and the production cost are greatly reduced.

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Номер записи: 2
23-07-2014 дата публикации

Polycarbonate process wastewater treatment method

Номер: CN103936216A
Автор: YANG MEI, WANG XIAOGUANG, MAO CHUNHUI, ZANG YANGLING, LIAO LANGUI, WANG YAN, QIU DEYUE, LIU GUOWEN
Принадлежит:

The invention discloses a polycarbonate process wastewater treatment method using a two-stage countercurrent continuous extraction system. The two-stage countercurrent continuous extraction system comprises a mixing kettle, a peristaltic pump, a centrifuge, an evaporator, a mixing kettle, a wastewater storage pot and a resin adsorption tower. A solvent used for synthesizing polycarbonate is used as an extractant, a feeding volume ratio of the extractant to wastewater is 0.08-0.1:1, and a feeding mass-to-volume ratio of resin to wastewater is 0.025:1. The resin used for adsorption is polystyrene resin. The method has the advantages of recycling of phenol substances in wastewater, less consumption of the extractant, low wastewater treatment cost and easy industrial amplification. The recovered phenol substances can be used for synthesizing polycarbonate, and treated brine can be directly discharged, or can be discharged to high salt environment, or can be used for the preparation of sodium ...

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Номер записи: 3