摘要:
The present invention provides a process for the production of guanidine nitrate by the reaction of urea and excess ammonium nitrate in the presence of a silicon dioxide catalyst at an elevated temperature, wherein the molten reaction mixture containing the dispersed catalyst is passed in a cycle, a branch current of the reaction mixture is continuously separated off by filtration in such a manner that the catalyst remains in circulation and consumed urea and ammonium nitrate are supplemented corresponding to the removal of the product.
摘要:
The invention relates to a method and apparatus for recovering lignin and kali from an alkaline lignin solution. One or more electrolytic cells are used to anodically acidify the lignin and simultaneously cathodically regenerate alkali. The invention is especially advantageous for the preparation of pure lignin and alkali from the waste liquor of a cellulose process.
摘要:
The present invention provides a process for obtaining guanidine hydrohalides from the by-product mixture obtained in the production of mercaptoalkylsilanes and consisting essentially of guanidine hydrohalide, ammonium halide, thiourea and silane compounds, wherein the by-product mixture is extracted with an aliphatic ketone containing up to 7 carbon atoms and the extract is separated from the residue containing the guanidine hydrohalide.