摘要:
New 9-anthrylalkyl compounds having the general formula ##STR1## wherein R is hydrogen or an alkyl group, whereby, however, not more than one of the groups R is an alkyl group; R.sub.1 is hydrogen, lower alkyl, halogen or nitro; n is an integer of from 1 to 7, whereby, however, the total number of carbon atoms in the group --CHR--(CHR).sub.n -- does not exceed 8; and X is halogen, an azide group or a succinimidyl group.The new compounds are prepared from 9-anthrylalcohols which are reacted with a compound X--CO--X wherein X is a halogen, and then optionally with compounds giving azide or succinimidyl group. The compounds are used as derivatization reagents for separation and detection purposes.Intermediates for preparation of the above defined 9-anthrylalkyl compounds wherein one R is an alkyl group are 9-anthrylalcohols with the group --CHR--(CHR).sub.n --OH, wherein one R is an alkyl group.
摘要:
The invention relates to a process for the production of alkali metal chlorates by electrolysis of alkali metal chloride. The electrolyte is prepared by addition of a crystal slurry having a dry content above 50 per cent by weight to the of alkali metal chloride depleted reaction solution flowing out from th eelectrolyster. The crystal slurry has been prepared by dissolving an alkali metal chloride in water whereafter the obtained water solution has been purified in a known manner and concentrated to the stated dry content.
摘要:
A process for the production of hydrogen peroxide according to the anthraquinone process. According to the process certain cyclic urea derivatives are used as solvents, and particularly as solvents for anthrahydroquinones. The cyclic urea derivatives whcih can be N,N'-dialkyl substituted alkyleneurea, give a very good solubility for anthrahydroquinones and also for anthraquinones. The compounds can be used as the sole solvent at the production of hydrogen peroxide or in combination with conventionally used solvents such as hydrocarbons.
摘要:
A process for the production of hydrogen peroxide according to the anthraquinone process. According to the process certain alkyl substituted caprolactames are used as solvents, and particularly as solvents for anthrahydroquinones. The substituted caprolactames, which for example can be hexyl caprolactam and octyl caprolactam, give a very good solubility for anthrahydroquinones and also for anthraquinones. The compounds can be used as the sole solvent at the production of hydrogen peroxide or in combination with conventionally used solvents such as hydrocarbons.
摘要:
At the production of alkali metal chlorate by electrolysis of alkali metal chloride in an electrolyser a part of the liquid phase from the electrolyser is brought to a crystallizer for precipitation of alkali metal chlorate crystals. The hydrogen gas formed in the electrolyser is purified from contamination of chlorine gas by contacting it with the outgoing mother liquor from the crystallizer, which has a pH in the interval 7.5 to 14. The mother liquor is then brought back to the electrolysis system.
摘要:
A process for the delignification and bleaching lignocellulosic-containing pulp, in which the pulp is delignified with an organic peracid or salts thereof, treated with a complexing agent, washed and subsequently bleached with a chlorine-free peroxide containing bleaching.
摘要:
The invention relates to hydrogen peroxide manufacture, and catalyst therefor, by direct oxidation of hydrogen with oxygen in an acidic aqueous medium. The catalyst includes a Group VIII metal on a partially hydrophobic, partially hydrophilic support, such as Pd on fluorinated carbon. Improvements in H.sub.2 O.sub.2 selectivity and catalyst stability are achieved by adding a source of sodium and chloride ions to the reaction medium and, in the case of a fluorinated carbon support, adding a source of fluoride ions.
摘要:
The invention concerns a solid alkalimetal silicate having a molar ratio SiO.sub.2 :M.sub.2 O from about 1.5 to about 3, in which M is an alkali metal and substantially consists of sodium and optionally potassium. The silicate contains from about 7 to about 20% by weight of sodium carbonate based on the dry material and has a water content from about 14 to about 22% by weight. Further, the invention concerns a method of preparing the silicate above, use of the same and cleaning agent compositions containing such a silicate.
摘要:
The invention relates to a method of sizing paper and similar cellulose products containing precipitated calcium carbonate as a filler. According to the method, an aqueous suspension of pulp is dewatered and dried in the presence of an aqueous dispersion of a rosin-based sizing agent, which comprises a rosin component and a rosin ester component, and an aqueous dispersion of a cellulose-reactive sizing agent. The invention also relates to an aqueous dispersion of sizing agents which comprises a rosin-based sizing agent, which contains a rosin component and a rosin ester component, and a cellulose-reactive sizing agent.
摘要:
Silica sols which have a large alkali excess, i.e. a low molar ratio SiO.sub.2 to M.sub.2 O, and which contain silica particles with a high specific surface area. The silica sols can be prepared through acidification of a water glass solution and subsequent alkalization of the acid sol to the molar ratio in question. The sols are particularly suitable for use as additives, in combination with cationic polymers, in papermaking.