Basf Aktiengesellschaft

Basf Se Corporation

Upm-kymmene Corporation

Ome Technologies Gmbh

Ineos Paraform Gmbh & Co. Kg

Makatec Gmbh

Technische Universitat Kaiserslautern

Hans Hasse

Bernd Bessling

Till Adrian

Eckhard Stroefer

Friedrich Sauer

Neven Lang

Sergej Blagov

Gerhard Wagner

Thomas Grützner

Jakob Burger

Ulrich Steinbrenner

Eckhard Ströfer

Achim Stammer

Georg Sieder

Andreas Keller

Maximilian Vicari

Heiner Schelling

Stephan Maurer

Heinz Auer

Hans Hammer

Gerhard Theis

Frans Vansant

Michael Ott

Juha Tamper

Norbert Asprion

Ralf Notz

Markus Siegert

Frank Hoefer

Ute Lichtfers

Martin Sohn

Bernhard Brunner

Thorsten Friese

Rupert Wagner

Eckard Stroefer

Norbert Stroh

Eckhard Str&ouml;fer

Stephan Scholl

Hugo Rafael Garcia Andarcia

Michael Hackner

Iven Clausen

Oliver Spuhl

Thomas Mayer

Hari Prasad Mangalapally

Frank Höfer

Jan-Oliver Drunsel

Thomas Weimer

Ulrich Schmidt

Eckehart Walitza

Mario Renner

Klemens Schilling

Nadia Galeotti

Niklas Schmitz

J&uuml;rgen Pl&uuml;ckhan

Inga Toennies

Fabian Jirasek

Sebastian Hoch

Heiko Hallmann

Maximilian Dyga

Matthias Schult

In a method and an apparatus furfural is separated from a material stream () which is formed in a treatment of a pretreated wood based material (). The material stream () which comprises at least furfural is introduced to a separation column (). A top vapor condensate () is introduced from a top end of the separation column () to a decanter () in which two liquid phases () are separated from each other. An organic phase () which comprises at least furfural is recovered, and an aqueous phase () is supplied as a reflux to the separation column (). Further, the invention relates to a furfural based product and chemical product and a use of the organic phase.

Method and an apparatus for separating furfural

Process for preparing polyoxymethylene dimethyl ethers having &#x2265;3 oxymethylene units (OME), comprising the steps: (i) introduction of formaldehyde, methanol and water into a reactor R and reaction to give a reaction mixture containing formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OME) and polyoxymethylene dimethyl ethers (OME);(ii) introduction of the reaction mixture into a reactive distillation column Kand separation into a low boiler fraction Fcontaining formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OME) and polyoxymethylene dimethyl ethers having from 2 to 3 oxymethylene units (OME) and a high boiler fraction Fcontaining polyoxymethylene dimethyl ethers having more than two oxymethylene units (OME).

Process for preparing polyoxymethylene dimethyl ethers from formaldehyde and methanol in aqueous solutions

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 removing acid gases from a fluid stream in which a) the fluid stream is treated with an absorption liquid which comprises at least one amine, a stripping aid, and water, wherein the stripping aid is selected from water-miscible liquids, the boiling temperature of which at atmospheric pressure is lower than that of water, b) the treated fluid stream is treated with a liquid aqueous phase in order to convert entrained stripping aid at least in part to the aqueous phase, c) the loaded aqueous phase is heated in order to expel the stripping aid at least in part, and d) the regenerated aqueous phase is cooled and at least in part recycled to step b). The stripping aid promotes the regeneration of the absorbent by stripping. Emissions of the stripping aid via the treated fluid stream are avoided by the treated fluid stream being scrubbed with a liquid aqueous phase.

Removal of acid gases by means of an absorbent comprising a stripping aid

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 thermodynamic machine for the absorption and emission of heat at different temperatures has at least one thermodynamic device with at least one membrane separating a gas phase and a liquid phase provided for transport of heat, wherein the at least one membrane is permeable for at least one component contained in the gas and liquid phases. The at least one membrane is a porous membrane or a solution diffusion membrane or a modification of the porous membrane or a modification of the solution diffusion membrane.

Thermodynamic machine and method for absorbing heat

A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by

Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification

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

An absorption medium for deacidifying fluid streams which has improved oxidation stability includes at least one aliphatic amine, and at least one non-hydroquinoid antioxidant. The absorption medium may be employed in deacidifying a fluid stream, in particular an oxygen-containing fluid stream, when the fluid stream is brought into intimate contact with the absorption medium in at least one absorption step.

Absorption medium and deacidification of fluid streams

A liquid mixture comprising at least one readily volatile and at least one sparingly volatile component is separated in a film evaporator by a process in which

Separation of liquid mixtures in a film evaporator

Process for preparing high-concentration gaseous formaldehyde having a molar CHO:HO ratio of &#x2267;0.6 from an aqueous formaldehyde solution by evaporation of at least part of the solution, in which the aqueous formaldehyde solution is heated to a vaporization temperature T and the gas phase formed is taken off, wherein the evaporation temperature T obeys the relationship:T[&#xb0; C.]&#x2267;T'[&#xb0; C.]where T&#x2032;(c)=A+B&#xd7;(c/100)+C&#xd7;(c/100)+D&#xd7;(c/100)andA=+68.759, B=+124.77, C=&#x2212;12.851, D=&#x2212;10.095,where c is the instantaneous CHO content of the aqueous formaldehyde solution during the evaporation in percent by weight and is from 20 to 99% by weight.

Method for preparing highly concentrated, gaseous formaldehydes

Process for preparing high-concentration formaldehyde solutions having a CHO content of &#x2267;50% by weight from an aqueous formaldehyde solution having a lower CHO content by evaporation of part of this solution (partial evaporation), in which the aqueous formaldehyde solution is heated to an evaporation temperature T at which the gas phase becomes enriched in water relative to the liquid phase and the gas phase formed is taken off continuously or discontinuously, wherein the evaporation temperature T obeys the relationship:T[&#xb0; C.]&#x3c;T[&#xb0; C.]where T()=&#xd7;(/100)+&#xd7;(/100)&#xd7;(/100)and

Production of high-concentration formaldehyde solutions

Method of stabilizing high-concentration formaldehyde solutions having a CHO content of &#x3e;70% by weight against precipitation of solids, which comprises heating the high-concentration formaldehyde solution at a heating rate of at least 5&#xb0; C./min to a temperature of from 80&#xb0; C. to 200&#xb0; C. immediately after it has been prepared and storing it at a temperature in this range.

Method for thermal stabilization of highly concentrated formaldehyde solutions

The invention relates to an apparatus and a process for the preparation of anhydrous or substantially anhydrous formic acid. This apparatus is constructed partly or entirely of substantially zirconium-free materials. The extractant employed is a liquid of the general formula I where the radicals Rand Rare alkyl, cycloalkyl, aryl or aralkyl groups, or Rand Rjointly, together with the N atom, form a heterocyclic 5- or 6-membered ring, and only one of the radicals is an aryl group, and where Ris hydrogen or a C&#x2013;C-alkyl group. The apparatus has a synthesis reactor (), a hydrolysis reactor (), three distillation devices () and an extraction device ().

Material for a facility for the production of anhydrous formic acid

Growing community of inventors

Kaiserslautern, Germany

Hans Hasse