Basf Aktiengesellschaft

Basf Se Corporation

Neven Lang

Eckhard Stroefer

Markus Siegert

Hans Hasse

Achim Stammer

Christoph Sigwart

Eckhard Ströfer

Ulrich Steinbrenner

Thorsten Friese

Thomas Grützner

Michael Ott

Gerhard Olbert

Markus Weber

Ortmund Lang

Joachim Thiel

Thorsten Johann

Laszlo Szarvas

Bernd Rumpf

Ute Lichtfers

Martin Fiene

Franz Niklaus Windlin

Tobias Kortekamp

Sergej Blagov

Eckard Stroefer

Julia Kirschbaum

Processes are disclosed comprising: (a) reacting an aqueous formaldehyde solution in a reactor in the presence of a suitable catalyst to obtain a reaction product mixture comprising trioxane, formaldehyde and water; (b) distilling the reaction product mixture to form a top stream comprising crude trioxane; and (c) treating the top stream in one or more additional stages to form pure trioxane; wherein an aqueous sidestream is drawn off during the distilling of the reaction mixture.

Trioxane production method wherein a side aqueous flow is deducted at a first distillation stage

An integrated process for preparing trioxane from formaldehyde.

Integrated method for the preparation of trioxane from formaldehyde

A process for preparing polyoxymethylene homopolymers or copolymers () by homopolymerization or copolymerization of trioxane, starting from methanol (), in which

Process for preparing polyoxymethylene homopolymers or copolymers by homopolymerization or copolymerization of trioxane, starting from methanol

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 separating trioxane from a feed stream I comprising formaldehyde, trioxane and water, in which

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

Processes comprising: providing a reactive distillation column having an upper region, a middle region and a lower region; feeding ethylene glycol and an aqueous formaldehyde solution into the reactive distillation column in the middle region of the reactive distillation column; reacting the ethylene glycol and the aqueous formaldehyde solution in the reactive distillation column in the presence of a catalyst to form dioxolane; removing a product stream comprising dioxolane in an amount of at least 75% by weight from the upper region of the reactive distillation column; and removing a bottom stream comprising one or more components having boiling points higher than dioxolane from the lower region of the reactive distillation column.

Method for the production of dioxolane

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

A process for preparing formaldehyde by gas-phase oxidation of methanol vapor by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst comprising iron and molybdenum, wherein the process is carried out in a reactor () having heat-exchange plates () which are arranged in the longitudinal direction of the reactor () and have a spacing between them and through which a heat transfer medium flows, inlet and outlet facilities () for the heat transfer medium to the heat-exchange plates () and also gaps () between heat-exchange plates () in which the fixed-bed catalyst is present and into which the methanol vapor and the gas stream comprising molecular oxygen are passed, is described.

Method for producing formaldehyde

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

A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheater and heated in the preheater, depressurized via a pressure maintenance device and concentrated in a helical tube evaporator to give a vapor stream and the high-concentration formaldehyde solution as bottom stream, wherein the heated lower-concentration formaldehyde hyde solution is depressurized in the pressure maintenance device to give a two-phase mixture which is fed into the helical tube evaporator, is proposed.

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Mannheim, Germany

Neven Lang