China Petroleum Engineering Corp. engages in the manufacture and sale of oil ... Its products include methyl tert-butyl ether, liquefied petroleum gas, 2-butanone, 2-butanol, hydrogen, nitric ...

WHEN petroleum ether extracts of dried leaf material are passed through Tswett adsorption columns composed of magnesia and siliceous earth, the leaf pigments are adsorbed, and colourless solution ...

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