摘要:
Polymers which due to their physiological compatibility may be used in plasma substitutes and which essentially contain vinylpyrrolidone and .alpha.,.omega.-diisocyanato-alkanecarboxylic acid esters as structural units, their preparation, and plasma substitutes containing such polymers.
摘要:
A pure D- or L-alanine enantiomer is prepared by reacting an optically active chloropropionic acid with ammonia in water or a water/alcohol mixture at from 50.degree. to 110.degree. C.
摘要:
Aqueous solutions of organic compounds which contain salts are concentrated by electrodialysis with simultaneous reduction of the salt content of these solutions, the concentrate used being an aqueous salt solution which is not less than 1 molar.
摘要:
The proposed catalyst for the gas-phase alkylation of phenols is based on magnesium oxide, contains up to 0.4% by weight of alkali metal oxide and is mechanically stabilized with from 1 to 8% by weight, based on the total weight of the catalyst, of graphite, molded and then heated.