CATALYTIC PROCESS BASED ON MOLECULAR SIEVES FOR TRANSESTERIFICATION REACTIONS

• Main Authors: OLIVEIRA, ALCINEIA CONCEICAO, FABIANO, DEMIAN PATRICK, CARDOSO, DISLON, MARTINS, LEANDRO
• Format: Patent
• Language: English; French; Portuguese
• Published: 01.04.2010
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; ORGANIC CHEMISTRY; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR RELEVANT APPARATUS; TRANSPORTING

A catalytic process is disclosed, based on molecular sieves, for transesterification reactions in the presence of a basic catalyst of the M41S family. In transesterification conditions and in the presence of an effective quantity of said catalyst, an alcohol and an ester are reacted, the reaction conditions being maintained as long as required for the reaction to take place. The solid catalyst is separated from the reaction medium for re-use in another reaction cycle, and for recovering a higher yield of the reaction products than the yields obtained by this kind of reaction in the presence of prior art catalysts or in the absence of any catalysts. The following molecular sieves are some examples of such catalysts: [CTA]-Si-MCM-41, [CTA]-Si-MCM-48 or [CTA]-Si-MCM-50. L'invention concerne un procédé catalytique faisant appel à des tamis moléculaires pour des réactions d'estérification en présence d'un catalyseur basique de la famille M41S, consistant à faire réagir, dans des conditions de transestérification et en présence d'une quantité efficace dudit catalyseur, un alcool et un ester, en maintenant les conditions réactionnelles pendant une durée suffisante pour la réalisation de la réaction, à séparer le catalyseur solide du milieu réactionnel en vue d'une utilisation dans un nouveau cycle réactionnel, et à récupérer les produits de la réaction avec des rendements supérieurs à ceux obtenus dans des réactions de ce type en présence de catalyseurs de l'état de la technique ou en l'absence de catalyseurs. Des exemples de ces catalyseurs sont les tamis moléculaires [CTA]-Si-MCM-41, [CTA]-Si- MCM-48 ou [CTA]-Si-MCM-50. É descrito um processo catalítico à base de peneiras moleculares para reações de esterificação em presenca de um catalisador básico da família M41S e fazer reagir sob condições de transesterificação e em presenca de uma quantidade eficaz do dito catalisador um álcool e um éster, mantendo as condições reacionais durante o período de tempo necessário para ocorrer a reação, separar o catalisador sólido do meio reacional, para utilização em um novo ciclo reacional e recuperar os produtos da reação com rendimentos superiores aqueles obtidos em reações desse tipo em presenca de catalisadores do estado da técnica ou em ausencia de catalisadores. Exemplos desses catalisadores são as peneiras moleculares [CTA]-Si-MCM-41, [CTA]-Si- MCM-48 ou [CTA]-Si-MCM-50.