Basf Se Corporation

Basf Aktiengesellschaft

Juergen Wortmann

Jan Spielmann

Frieder Borgmeier

Sabine Weiguny

Feelly Ruether

Michael Zeilinger

Michael Koch

Katharina Federsel

Dieter Lilge

Otto Machhammer

Dieter Horn

Kerstin Schierle-Arndt

Helmut Auweter

Stephan Maurer

Michael Lutz

Guenther Huber

Fabian Seeler

Matthias Hinrichs

Bjoern Kaibel

Rosario Mazarro Berdonces

Felix Major

Robert Sengpiel

Martin Gaertner

Claus Schaefer

A process for manufacturing of an alkanesulfonic acid, and an alkanesulfonic acid manufactured by the process. Aspects of the process may involve manufacturing an alkanesulfonic acid by reaction of an initiator composition with an alkane and sulfur trioxide by preparing an initiator composition by reacting aqueous hydrogen peroxide with alkanesulfonic acid and/or HSO; and reacting the initiator composition with sulfur trioxide and alkane to form an alkanesulfonic acid, wherein an alkane with a purity of at least 98.0 mol-% is used.

Process for the manufacturing of alkanesulfonic acids

A heat transfer or storage medium containing a nitrate salt composition including at least one alkali metal nitrate and optionally alkaline earth metal nitrate; and, at least one alkali metal nitrite and optionally alkaline earth metal nitrite in an amount of 1.1 to 15.0 mol %. The molar amount of the alkali metal nitrite and optionally alkaline earth metal nitrite for a desired temperature is calculated by Xis the mole fraction of nitrite,K(T) is the temperature-dependent equilibrium constant of the reaction nitrate &#x21c4;nitrite+&#xbd; oxygen (NO&#x21c4; NO+&#xbd; O),pOis the oxygen partial pressure and T is the temperature of the nitrate salt composition.

Use of a nitrate salt composition as a heat transfer or heat storage medium for first operation of an apparatus containing these media

The present invention relates to a process for the manufacturing of methane sulfonic acid (MSA) by reaction of a radical initiator composition with methane and sulfur trioxide comprising the steps (a) preparation of the intiator composition by reacting aqueous hydrogen peroxide with the components methane sulfonic acid and methane sulfonic acid anhydride and (b) reaction of the initiator composition from step (a) with sulfur trioxide and methane to form methane sulfonic acid. The invention further relates to the use of methane sulfonic acid anhydride (MSA anhydride) in said process and to methane sulfonic acid manufactured by said process.

Process for the manufacturing of methane sulfonic acid

The present invention deals with a process for the production of alkanesulfonic acids, in particular methanesulfonic acid, and a method of purification of the raw products.

Process for the production of alkanesulfonic acids

A process for purifying alkanesulfonic anhydride that includes feeding a stream containing alkanesulfonic anhydride, sulfuric acid, high boilers and residual low boilers into a melt crystallization to form crystals of the alkanesulfonic anhydride suspended in mother liquor, and solid-liquid separation to remove the crystals from the mother liquor.

Process for purifying alkanesulfonic anhydride and process for producing alkanesulfonic acid using the purified alkanesulfonic anhydride

A process comprising: (a) distilling a melt comprising crude alkanesulfonic acid to completely or partly remove low boilers, wherein the low boilers are drawn off at the top of a distillation column or of a one-stage evaporation apparatus and a material stream comprising alkanesulfonic acid, high boilers and residual low boilers is withdrawn at the bottom of the distillation column or of the one-stage evaporation apparatus, (b) sending the stream comprising alkanesulfonic acid, high boilers and residual low boilers into a melt crystallization as the starting melt to obtain crystals formed from the alkanesulfonic acid, hydrates of the alkanesulfonic acid or a mixture of both suspended in mother liquor, (c) performing a solid-liquid separation to remove the crystals from the mother liquor, and (d) optionally washing the crystals to remove mother liquor adhering to the crystals.

Process for purifying alkanesulfonic acids

The invention relates to a method of reprocessing alkanesulfonic acid employed in a chemical process as an agent, catalyst or solvent and comprising the steps of:

Method of reprocessing alkanesulfonic acid

In a fiber-optical sensor used for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS), the scattered light originating from particles in movement, the emergence surface (7) for the laser light at the end of a single-mode or multimode light guide (3) used as an immersion probe is inclined at an angle 0&lt;.phi..ltoreq.15.degree., preferably 1.degree..ltoreq..phi..ltoreq.6.degree., the angle of inclination being de-fined by the optical axis (8) of the light guide (3) and the normal (9) of the emergence surface (7).

Fiber-optical sensor

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Ludwigshafen, Germany

Juergen Wortmann