A method of operating a tissue processor for processing tissue samples. The tissue processor includes at least one retort for receiving tissue samples, at least one container for storing a reagent, and at least one sensor arranged for fluid communication with one or both of the at least one container and the at least one retort for measuring a measured purity level of a reagent. The method includes conducting reagent from the at least one container or the at least one retort to the at least one sensor, automatically measuring a measured purity level of the reagent, checking whether the measured purity level meets a predetermined purity level of the reagent associated with the at least one container, and thereby automatically determining whether the reagent is suitable for processing tissue samples in the tissue processor. Also, a tissue processor for processing tissue samples and a container for storing tissue samples.

An arrangement for closing a container, in particular a flask, for determining evaporation properties of a liquid in the flask according to at least one standardized test. The arrangement has at least one temperature measurement system, a sensor, a closing element adapted for contacting a surface of an opening in the container for closing the container and having a through-opening through which a portion of the temperature measurement sensor is guided such that a lower end of the sensor is arranged within the container. The arrangement further includes a mechanism for adjusting a position of the lower end of the sensor along a longitudinal direction of the temperature measurement sensor.

The present invention provides an apparatus comprising a feed arranged below the middle of the apparatus, a quenching agent inlet arranged above the feed, an outlet arranged below the feed and a draw arranged above the quenching agent inlet, the apparatus having a region provided with one or more packing elements, wherein at least one means which ensures the formation of a liquid layer having a height of at least 1 cm is present between the quenching agent inlet and a packing element present between the quenching agent inlet and feed. The present invention also provides a process for preparing acrylic acid, which includes a step of oxidizing acrolein, wherein the reaction mixture obtained in this oxidation is contacted with water as quenching agent in an inventive apparatus, and a composition obtainable as bottom product in the process according to the invention, comprising acrylic acid and water.

The present invention provides an apparatus comprising a feed arranged below the middle of the apparatus, a quenching agent inlet arranged above the feed, an outlet arranged below the feed and a draw arranged above the quenching agent inlet, the apparatus having a region provided with one or more packing elements, wherein at least one means which ensures the formation of a liquid layer having a height of at least 1 cm is present between the quenching agent inlet and a packing element present between the quenching agent inlet and feed. The present invention also provides a process for preparing acrylic acid, which includes a step of oxidizing acrolein, wherein the reaction mixture obtained in this oxidation is contacted with water as quenching agent in an inventive apparatus, and a composition obtainable as bottom product in the process according to the invention, comprising acrylic acid and water.

The present invention relates to an apparatus for the hydroconversion of heavy oil products (the fresh load). Said apparatus comprises: a slurry bubble column hydroconversion reactor, which comprises a feed line in which the fresh load and the recirculated slurry phase are conveyed, an inlet line for a hydrogenating stream and an outlet for a reaction effluent through an outlet nozzle; a stripping column at high pressure and high temperature placed downstream of the reactor and directly connected to the reactor head through a pipeline in which the reaction effluent flows; said column having an inlet line for a stripping gas, an inlet for the reactor effluent, a head outlet for steam and an outlet for the slurry phase; lines and means for recirculating the slurry leaving the stripping column; lines and means for taking a drain stream, which has the function of preventing the accumulation of solids in the reactor. The stripping column is characterized in that it contains one or more contact devices that allow physical contact to be created between different phases.

An acid purifier, comprising: a container (1) for an acid to be purified; a heater (2); a condenser (3) including a Peltier semiconductor cooler, a condenser body (600) and a refrigerant temperature sensor; a purified acid liquid collection bottle (4) connected with the condenser; a controller; an integrated liquid level control component (300) for the acid to be purified, connected with the container (1) for the acid to be purified, and arranged in such a way that a liquid level pipe (320), a liquid adding funnel (310) and a waste liquid discharge valve (330) are integrated; and an acid liquid temperature sensor (400, 500) arranged in the acid to be purified.

An acid purifier, comprising: a container (1) for an acid to be purified; a heater (2); a condenser (3) including a Peltier semiconductor cooler, a condenser body (600) and a refrigerant temperature sensor; a purified acid liquid collection bottle (4) connected with the condenser; a controller; an integrated liquid level control component (300) for the acid to be purified, connected with the container (1) for the acid to be purified, and arranged in such a way that a liquid level pipe (320), a liquid adding funnel (310) and a waste liquid discharge valve (330) are integrated; and an acid liquid temperature sensor (400, 500) arranged in the acid to be purified.

The invention relates to a crossflow tray for a mass transfer column (27) in which a gas is conducted in countercurrent to a liquid, the crossflow tray (1) having passage orifices (3) for the gas and at least two downcomers (5), the downcomers (5) projecting beyond the top surface of the crossflow tray (1) and a collecting cup (13) being disposed beneath each downcomer (5). The downcomer (5) projects into the collecting cup (13), the minimum horizontal cross-sectional area of the collecting cup (13) is 1.2 to 4 times greater than the horizontal cross-sectional area of the downcomer (5) at the outlet, and the collecting cup (13) has a circumferential wall (15) having an overflow (19). The invention further relates to a mass transfer column comprising the crossflow trays and to a use of the mass transfer column.

An acid purifier, comprising: a container (1) for an acid to be purified; a heater (2); a condenser (3) including a Peltier semiconductor cooler, a condenser body (600) and a refrigerant temperature sensor; a purified acid liquid collection bottle (4) connected with the condenser; a controller; an integrated liquid level control component (300) for the acid to be purified, connected with the container (1) for the acid to be purified, and arranged in such a way that a liquid level pipe (320), a liquid adding funnel (310) and a waste liquid discharge valve (330) are integrated; and an acid liquid temperature sensor (400, 500) arranged in the acid to be purified.

An acid purifier, comprising: a container (1) for an acid to be purified; a heater (2); a condenser (3) including a Peltier semiconductor cooler, a condenser body (600) and a refrigerant temperature sensor; a purified acid liquid collection bottle (4) connected with the condenser; a controller; an integrated liquid level control component (300) for the acid to be purified, connected with the container (1) for the acid to be purified, and arranged in such a way that a liquid level pipe (320), a liquid adding funnel (310) and a waste liquid discharge valve (330) are integrated; and an acid liquid temperature sensor (400, 500) arranged in the acid to be purified.