摘要:
According to this invention there is provided a method of recovering thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, the waste liquor after separation of the crystals of thiourea dioxide after reaction is treated with an ion-exchange resin to remove side reaction products and impurities contained therein, and is then concentrated with a reverse-osmotic membrane to crystallize the thiourea dioxide dissolved therein.
摘要:
According to this invention there is provided a process for preparing thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, the filtrate after separation of the crystals of thiourea dioxide after reaction is treated with an ion-exchange resin to remove side reaction products and impurities contained therein and then is used again as a reaction solvent.
摘要:
Styrene oxide is prepared by reacting styrene and hydrogen peroxide in a heterogeneous system in the presence of a bis(tri-n-alkyltinoxy)molybdic acid and an amine represented by the following general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each independently represent H, CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7, C.sub.4 H.sub.9, or HOCH.sub.2 CH.sub.2.
摘要:
Styrene oxide is prepared by reacting styrene and hydrogen peroxide in a heterogenous system in the presence of a bis(tri-n-alkyltinoxy) molybdic acid and an inorganic anion.
摘要:
A novel water-soluble produced by contacting thiourea dioxide with an aqueous solution comprising an amino acid having the general formula NH.sub.2 (CH.sub.2).sub.n COOH wherein n is an integer of 1 to 7 and a sodium, potassium or calcium salt of acetic acid.
摘要:
Metal ions contained in hydrogen peroxide can be removed efficiently, safely and inexpensively by contacting hydrogen peroxide to be purified with an anion exchange resin with a chelating agent adsorbed therein.
摘要:
An amine-substituted thiourea dioxide is obtained by reacting thiourea dioxide and an aliphatic or aromatic primary amine in a neutral or acidic pH range.
摘要:
4,4'-Dihydroxydiphenyl sulfone is isolated from a mixture of dihydroxydiphenyl sulfone isomers by heat dissolving the mixture in phenol and then cooling the resulting solution thereby allowing 4,4'-dihydroxydiphenyl sulfone to precipitate as an adduct with phenol.