Basf Aktiengesellschaft

Ineos Paraform Gmbh & Co. Kg

Basf Se Corporation

Sergej Blagov

Eckhard Stroefer

Achim Stammer

Hans Hasse

Heiner Schelling

Markus Siegert

Eckhard Ströfer

Neven Lang

Thorsten Friese

Jakob Burger

Thomas Grützner

Michael Ott

Jan-Oliver Drunsel

Ulrich Schmidt

Mario Renner

The invention relates to a continuous process to make and isolate methylal by reacting formaldehyde and methanol with an acid catalyst under at least partial formation of methylal and water, to form a mixture Mcomprising formaldehyde, methanol, methylal, and water, separating the said mixture Min a distillation column B into three distinct product streams, one being a distillate taken from the column head BH which is rich in methylal, one taken from the column bottom stream BB being almost pure water, and one taken from the side of the column B below the reaction zone which stream is rich in methanol, characterised in that the ratio of the amount of substance of methanol to the amount of substance of formaldehyde in the mixture Mis at least 3 mol/mol, and to an apparatus to be used with this process.

Process for the production of pure methylal

A process for preparing polyoxymethylene dialkyl ethers of the formulaHCO(CHO)CHwhere n=2-10,

Method for the production of polyoxymethylene dialkyl ethers from trioxan and dialkylethers

A process for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDME) by reacting formaldehyde with methanol and subsequently working up the reaction mixture by distillation, consisting of: a) feeding aqueous formaldehyde solution and methanol into a reactor and reacting to give a mixture including formaldehyde, water, methylene glycol (MG), polyoxymethylene glycols (MG), methanol, hemiformals (HF), methylal (POMDME) and polyoxymethylene glycol dimethyl ethers (POMDME); b) feeding the reaction mixture a into a first distillation column and separating into a low boiler fraction band a high boiler fraction bincluding formaldehyde, water, methanol, MG, HF and POMDME; c) feeding the high boiler fraction binto a second distillation column and separating into a low boiler fraction cincluding formaldehyde, water, MG, MG, methanol, HF, di-, tri- and tetraoxymethylene glycol dimethyl ether (POMDME), and a high boiler fraction c; d) feeding the low boiler fraction cinto a third distillation column and separating into a low boiler fraction dand a high boiler fraction dsubstantially consisting of formaldehyde, water, MG, MGand POMDME; e) feeding the high boiler fraction dinto a phase separation apparatus and separating into an aqueous phase esubstantially consisting of formaldehyde, water, MG and MG, and an organic phase eincluding POMDME; and f) feeding the organic phase einto a fourth distillation column and separating into a low boiler fraction fsubstantially consisting of formaldehyde, water, MG and MG, and a high boiler fraction fsubstantially consisting of POMDME.

Process for preparing polyoxymethylene dimethyl ethers from methanol and formaldehyde

Processes for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDME) include feeding a reaction mixture of an aqueous formaldehyde solution and methanol into a reactive evaporator and separating into a first low boiler fraction and a first high boiler fraction, recycling the first high boiler fraction into the reactor, feeding the first low boiler fraction into a first distillation column and separating into a second low boiler fraction and a second high boiler fraction, recycling the second high boiler fraction into the reactive evaporator, feeding the second low boiler fraction into a second distillation column and separating into a third low boiler fraction and a third high boiler fraction, feeding the third high boiler fraction into a phase separation apparatus and separating into an aqueous phase and an organic phase, and feeding the organic phase into a third distillation column and separating into a low and high boiler fractions.

Method for producing polyoxymethylene dimethyl ethers from methanol and formaldehyde

Growing community of inventors

Stuttgart, Germany

Sergej Blagov