摘要:
Process for cooking lignocellulosic materials by heating the said materials in a cooking solution containing caustic soda with or without an alkali metal sulphide, in which the solution used contains about 0.01% to 10%, preferably 0.05% to 2%, by weight of 1,2,3,4-tetrahydro-9,10-anthracenediol based on the weight of the dry lignocellulosic material.
摘要:
This invention relates to catalysts for gaseous phase fluorination of aliphatic chlorinated derivatives by hydrofluoric acid. The catalysts comprise chromium oxide microspheres obtained by a sol-gel process. This invention also relates to gaseous phase fluorination processes for aliphatic chlorinated derivatives utilizing these catalysts.
摘要:
The compounds of the formula: ##STR1## in which R.sub.1 represents a dichloromethyl or trichloromethyl group, X.sub.1 represents a chlorine or fluorine atom, X.sub.2 represents a chlorine or fluorine atom, X.sub.3 represents a hydrogen, chlorine or fluorine atom, R.sub.2 represents an amino group NH.sub.2 or a ##STR2## group, in which R.sub.3 represents a hydrogen atom or an alkyl, haloalkyl, alkenyl, haloalkenyl, arylalkyl, arylhaloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl or aryl group, this latter being unsubstituted or substituted by one or two halogen atoms or by an alkyl, alkoxy, nitro or haloalkyl group are antidotes against herbicides.
摘要:
Resorcinol is prepared in high yield and purity by an improved process through superacid (such as perfluorinated alkanesulfonic acids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids, such as acidified Nafion-H, catalyzed cleavage rearrangement reaction of meta-bis(2-hydroperoxy-2-propyl)benzene (meta-diisopropylbenzene dihydroperoxide). Part of the process is the preparation of needed meta-diisopropylbenzene in high purity (98-100%) substantially free of other isomers by treating any mixture of diisopropylbenzenes with an excess of anhydrous hydrogen fluoride or a perfluorinated alkanesulfonic acid of one to eighteen carbon atoms and a Lewis acid fluoride, or by alkylating (transalkylating) cumene with a propyl alkylating agent in the aforementioned superacid systems.
摘要:
Resorcinol is prepared by an improved process through superacid (such as perfluorinated alkanesulfonic superacids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids, such as Nafion-H catalyzed cleavage-rearrangement reaction of meta-isopropylphenol hydroperoxide in the form of its protected ether or ester derivatives, including readily cleavable and reusable trimethylsilyl and trifluoromethanesulfonyl derivates. Part of the process is the preparation of needed meta-isopropylphenol in high purity free of other isomers by treating any mixture of isopropylphenol isomers in an excess of anhydrous hydrogen fluoride or a perfluorinated alkanesulfonic superacid of one to eighteen carbon atoms and a Lewis acid fluoride or by alkylating (transalkylating) phenol with a propyl alkylating agent in the presence of the aforementioned superacid systems.
摘要:
The invention relates to a composition for the protection of materials against contaminations, spots and stains.This liquid composition comprises by weight 0.1 to 1% of at least one fluorinated resin based on acrylic or methacrylic esters of fluorinated sulfonamido-alcohol, associated or not with non-fluorinated monomers, 0.4 to 10% of at least one adjuvant selected from aminoplast resins based on melamine, thermoplastic resins and waxes, and 89 to 99.5% of at least one organic solvent.Applied on materials such as walls, facades, monuments or sculptures in cement, bricks, concrete or stones and other construction elements, the composition according to the invention confers on the materials an excellent protection against natural or artificial contaminations.
摘要:
A process for the preparation of 1,2,3,4-tetrahydro-9,10-anthracene-diol, in which catalytic hydrogenation of 1,4,4a,9a-tetrahydro-anthraquinone is carried out in the liquid phase to give 1,2,3,4,4a,9a-hexahydro-9,10-anthracene-dione followed by isomerization of the latter in the presence of an acid to give 1,2,3,4-tetrahydro-9,10-anthracene-diol.
摘要:
Resorcinol is prepared in high yield and purity by an improved process through superacid (such as perfluorinated alkanesulfonic acids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids, such as acidified Nafion-H, catalyzed cleavage-rearrangement reaction of meta-bis(2-hydroperoxy-2-propyl)-benzene (meta-diisopropylbenzene dihydroperoxide). Part of the process is the preparation of needed meta-diisopropylbenzene in high purity (98-100%) substantially free of other isomers by treating any mixture of diisopropylbenzenes with an excess of anhydrous hydrogen fluoride or a perfluorinated alkanesulfonic acid of one to six carbon atoms and a Lewis acid fluoride, or by alkylating (transalkylating) cumene with a propyl alkylating agent in the aforementioned superacid systems.
摘要:
Process for the preparation of the mononitro derivatives substituted in positions 5 or 6 of 1,2,3,4-tetrahydro-anthraquinone, which comprises nitrating 1,2,3,4,4a,9a-hexahydro-9,10-anthracene-dione by means of nitric acid or a mixture of nitric acid and sulfuric acid.
摘要:
The present invention is directed to a process for biological denitrification of effluents, containing up to 10 g/l of nitric nitrogen, which comprises using an active denitrification support made of selected high performance denitrifying bacteria fixed on a neutral support.