Abstract: An optoelectronic sensor comprising a light receiver, receiving optics in front of the light receiver, and a focus adjustment unit having an actuator and configured to move the light receiver, wherein the focus adjustment unit comprises a parallel guide having at least one flexible retaining element and moving the light receiver in a constant orientation on the optical axis of the receiving optics.

Abstract: An optoelectronic sensor comprising a light receiver, receiving optics in front of the light receiver, and a focus adjustment unit having an actuator and configured to move the light receiver, wherein the focus adjustment unit comprises a parallel guide having at least one flexible retaining element and moving the light receiver in a constant orientation on the optical axis of the receiving optics.

Abstract: A lens module (38) is provided that has a module housing (42) having a base (44) and a side wall (46), an adaptive lens (40) variable in its focal length in the module housing (42), and a pressing element (48) to hold the adaptive lens (40) in the module housing (42), The pressing element has a wave spring (48) here.

Abstract: In a method and an apparatus furfural is separated from a material stream (3) which is formed in a treatment of a pretreated wood based material (1). The material stream (3) which comprises at least furfural is introduced to a separation column (5). A top vapor condensate (6) is introduced from a top end of the separation column (5) to a decanter (10) in which two liquid phases (9,11) are separated from each other. An organic phase (9) which comprises at least furfural is recovered, and an aqueous phase (11) is supplied as a reflux to the separation column (5). Further, the invention relates to a furfural based product and chemical product and a use of the organic phase.

Abstract: In a method and an apparatus furfural is separated from a material stream (3) which is formed in a treatment of a pretreated wood based material (1). The material stream (3) which comprises at least furfural is introduced to a separation column (5). A top vapor condensate (6) is introduced from a top end of the separation column (5) to a decanter (10) in which two liquid phases (9,11) are separated from each other. An organic phase (9) which comprises at least furfural is recovered, and an aqueous phase (11) is supplied as a reflux to the separation column (5). Further, the invention relates to a furfural based product and chemical product and a use of the organic phase.

Abstract: Process for preparing polyoxymethylene dimethyl ethers having ?3 oxymethylene units (OMEn?3), 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 (OMEn=1) and polyoxymethylene dimethyl ethers (OMEn>1); (ii) introduction of the reaction mixture into a reactive distillation column K1 and separation into a low boiler fraction F1 containing formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OMEn=1) and polyoxymethylene dimethyl ethers having from 2 to 3 oxymethylene units (OMEn=2-3) and a high boiler fraction F2 containing polyoxymethylene dimethyl ethers having more than two oxymethylene units (OMEn?3).

Abstract: Process for preparing polyoxymethylene dimethyl ethers having ?3 oxymethylene units (OMEn?3), 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 (OMEn=1) and polyoxymethylene dimethyl ethers (OMEn>1); (ii) introduction of the reaction mixture into a reactive distillation column K1 and separation into a low boiler fraction F1 containing formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OMEn=1) and polyoxymethylene dimethyl ethers having from 2 to 3 oxymethylene units (OMEn=2-3) and a high boiler fraction F2 containing polyoxymethylene dimethyl ethers having more than two oxymethylene units (OMEn?3).

Abstract: An adjustment apparatus (20) for an optical element (12) of an optoelectronic sensor (10) is provided comprising a drive (32), a cam disk (22) rotatable by the drive (32) and a transmission element (26) which is in contact with a periphery of the cam disk (22) and is connected to the optical element (12) in order thus to convert a rotary movement of the cam disk (22) into an adjustment movement of the optical element (12). In this respect, the cam disk (22) is manufactured from metal in an etching technology.

Abstract: A sensor (10) having a housing (12) is provided which has a main housing part (14) and a connection part (16) having a connection (18, 20, 22), wherein the connection part (16) is movably attached at the main housing part (14), in such a way that the connection (18, 20, 22) is selectively accessible from two sides of the housing (12). In this connection the connection part (16) has at least three connections (18, 20, 22) and is movable at the main housing part (14) in such a way that the at least three connections (18, 20, 22) are selectively accessible from two sides of the housing (12).

Abstract: An adjustment apparatus (20) for an optical element (12) of an optoelectronic sensor (10) is provided comprising a drive (32), a cam disk (22) rotatable by the drive (32) and a transmission element (26) which is in contact with a periphery of the cam disk (22) and is connected to the optical element (12) in order thus to convert a rotary movement of the cam disk (22) into an adjustment movement of the optical element (12). In this respect, the cam disk (22) is manufactured from metal in an etching technology.

Abstract: 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 M2 comprising formaldehyde, methanol, methylal, and water, separating the said mixture M2 in 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 M1 is at least 3 mol/mol, and to an apparatus to be used with this process.

Abstract: A sensor (10) having a housing (12) is provided which has a main housing part (14) and a connection part (16) having a connection (18, 20, 22), wherein the connection part (16) is movably attached at the main housing part (14), in such a way that the connection (18, 20, 22) is selectively accessible from two sides of the housing (12). In this connection the connection part (16) has at least three connections (18, 20, 22) and is movable at the main housing part (14) in such a way that the at least three connections (18, 20, 22) are selectively accessible from two sides of the housing (12).

Abstract: 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 M2 comprising formaldehyde, methanol, methylal, and water, separating the said mixture M2 in 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 M1 is at least 3 mol/mol, and to an apparatus to be used with this process.