Abstract:
The invention is directed to an improved, reliably performable process for preparing triallyl isocyanurate (TAIC) by Cu 2+ -catalysed rearrangement of triallyl cyanurate (TAC) at at least 90°C. According to the invention, TAC and, if required, also a Cu 2+ catalyst and solvent are fed continuously to a start reaction mixture after onset of the initially inhibited isomerization reaction, the isomerization is performed at from 90 to 160°C and an amount of reaction mixture equivalent to the amount of reactant is drawn off continuously and sent to the workup. Preference is given to effecting the isomerization in TAIC as the reaction medium.
Abstract:
The invention relates to triazine compounds which comprise substituents containing amino groups as well as carboxyl groups. Also disclosed is a method for the production thereof.
Abstract:
The invention relates to an improved process for preparing triallyl cyanurate (TAC) by reacting cyanuric chloride with allyl alcohol in the presence of an alkali metal acid acceptor and in the absence of an organic solvent other than allyl alcohol. According to the invention, TAC is obtained in over 99% purity with an APHA colour number below 10 in a yield of over 90% when 3.9 to 6.0 mol of allyl alcohol and 3.0 to 3.2 equivalents of acid acceptor are used per mole of cyanuric chloride, cyanuric chloride and acid acceptor are added simultaneously or successively to anhydrous or at least 50% by weight aqueous allyl alcohol, and the reaction is performed in one or more stages at a temperature in the range of -5 to +50°C.
Abstract:
The present invention is directed towards a method for the production of 2,4,6-trimercapto-1,3,5-triazine (TMT-H3). In particular, the method of the subject matter relates to the operation of acidifying the salts of 2,4,6-trimercapto-1,3,5-triazine in aqueous solution and in a defined pH range.
Abstract:
La invención se relaciona con un proceso mejorado para la preparación de cianurato de trialilo (TAC) mediante la reacción de cloruro cianúrico con alcohol alílico en presencia de un aceptor de ácido de metal alcalino y en ausencia de un solvente orgánico diferente al alcohol alílico. De conformidad con la invención, el TAC es obtenido con una pureza mayor a 99% con un número de color APHA inferior a 10 en un rendimiento superior a 90% cuando se utilizan de 3.9 a 6.0 moles de alcohol alílico y de 3.0 a 3.2 equivalentes de aceptor de ácido por mol de cloruro cianúrico, el cloruro cianúrico y el aceptor de ácido se agregan simultáneamente o sucesivamente a alcohol alílico anhidro o acuoso de por lo menos al 50% en peso, y la reacción se realiza en una o más etapas a una temperatura en el intervalo de -5ºC a +50ºC.
Abstract:
The invention is directed to an improved, reliably performable process fo r preparing triallyl isocyanurate (TAIC) by Cu2+-catalysed rearrangement of triallyl cyanurate (TAC) at at least 90øC. According to the invention, TAC a nd, if required, also a Cu2+ catalyst and solvent are fed continuously to a start reaction mixture after onset of the initially inhibited isomerization reaction, the isomerization is performed at from 90 to 160øC and an amount o f reaction mixture equivalent to the amount of reactant is drawn off continu ously and sent to the workup. Preference is given to effecting the isomeriza tion in TAIC as the reaction medium.
Abstract:
The direct handling of acrolein for combating microbial, plant and animal parasites in water and soil is problematic owing to the potential risks posed by acrolein. According to the invention, an easy-to-handle acrolein-releasing composition is used, the acrolein being released at the site of use owing to contact with water. This composition contains (i) an acrolein acetal having a C1 to C6 alcohol with 1 to 4 hydroxyl groups and (ii) a chemically compatible acid which is soluble therein and has a pK s value of less than 4 and (iii) is anhydrous. A preferred composition contains as acetal 2-vinyl-1,3-dioxolane, as acid, anhydrous oxalic acid, furnaric acid or maleic acid or a mixture of mono and di(C1 to C3)alkylphosphate and additionally a nonionic surfactant.
Abstract:
Acrolein copolymers prepared from acrolein and one or more polyhydric alcohols, which will release monomeric acrolein in an aqueous system and hence have a prolonged effect on microorganisms. The copolymer is prepared by adding acrolein to a reaction medium containing one or more polyhydric alcohols and a catalyst in dissolved form, while not allowing the temperature of the reaction medium to rise above 50.degree.C. The acrolein-releasing copolymer may be used in aqueous systems as a biocide.