摘要:
This invention resides in a polymerization process which is catalyzed by an oxyanion which can form a conjugate acid having a pKa (DMSO) of about 5 to about 24.
摘要:
A modified montmorillonite clay is prepared by heating it, impregnating it with an organic liquid, acid-activating it with a strong acid, and then washing it with water until it is substantially free of acid anions. The modified clay is useful as a catalyst, particularly for the preparation of tetrahydrofuran/alkylene oxide copolymers.
摘要:
Textile treatment compositions are disclosed, comprising polymers of perfluoroalkyl (meth)acrylate and other monomers such as 2-chlorohydroxypropyl methacrylate or other alkyl (meth)acrylates; propylene glycol monomethyl ether; and trichlorotrifluoroethane.
摘要:
The level of aldehyde and ketone impurities in tetrahydrofuran can be significantly reduced by bringing the tetrahydrofuran into contact with sodium borohydride and then separating the modified impurities and the tetrahydrofuran.
摘要:
A modified montmorillonite clay is prepared by heating it, impregnating it with an organic liquid, acid-activating it with a strong acid, and then washing it with water until it is substantially free of acid anions. The modified clay is useful as a catalyst, particularly for the preparation of tetrahydrofuran/alkylene oxide copolymers.
摘要:
A polymerizate of THF and an alkylene oxide is prepared by catalytic polymerization, using as a catalyst an acid-activated montmorillonite clay having a pore volume of 0.4-0.8 cubic centimeter per gram, a surface area of 220-260 square meters per gram and an average pore diameter of 0.1-0.3 micron.
摘要:
An improved process is provided for producing an aromatic amine from ammonia and an aromatic compound which comprises reacting the aromatic compound with ammonia at a temperature of from about 150.degree. C. to about 500.degree. C. and at a pressure of from about 10 to about 1000 atmospheres in the presence of a conditioned nickel/nickel oxide/zirconium oxide cataloreactant which has been treated with ammonia prior to introduction of the cataloreactant to the amination reactants.