The invention relates to a heat transfer tube (9) for falling film evaporation having a heating medium surface (21) to be heated by a heating medium, a falling film surface (20) to have spent liquor passing over it, and being made from an iron based high alloy stainless steel material with an alloy content above 16.00% for Chromium and above 1% for Nickel. The falling film surface of the heat transfer tube is equipped with one or several protrusions/indentations forming a multitude of stamped bumps (SB) on the envelope surface of a heat transfer tube such that the distance between adjacent stamped bumps (SB) along a line on the envelope surface parallel to the longitudinal axis of the heat transfer tube is within the range of 3 to 250 mm, said stamped bumps (SB) having a height (hp) in the range 0.3 to 5.0 mm, a width (wp) in the range 1.0-20 mm, and an inclination angle (a) versus a plane orthogonal to a longitudinal axis (CC) of the heat transfer tube in a range of 0-70 degrees so that each stamped bump (SB) is inclined and extends along at least a portion of the heat transfer tube or extend within a plane orthogonal to the longitudinal axis of the heat transfer tube. The invention also relates to a method for manufacturing said heat transfer tube.

The invention relates to a heat transfer tube (9) for falling film evaporation having a heating medium surface (21) to be heated by a heating medium, a falling film surface (20) to have spent liquor passing over it, and being made from an iron based high alloy stainless steel material with an alloy content above 16.00% for Chromium and above 1% for Nickel. The falling film surface of the heat transfer tube is equipped with one or several protrusions/indentations forming a multitude of stamped bumps (SB) on the envelope surface of a heat transfer tube such that the distance between adjacent stamped bumps (SB) along a line on the envelope surface parallel to the longitudinal axis of the heat transfer tube is within the range of 3 to 250 mm, said stamped bumps (SB) having a height (hp) in the range 0.3 to 5.0 mm, a width (wp) in the range 1.0-20 mm, and an inclination angle (a) versus a plane orthogonal to a longitudinal axis (CC) of the heat transfer tube in a range of 0-70 degrees so that each stamped bump (SB) is inclined and extends along at least a portion of the heat transfer tube or extend within a plane orthogonal to the longitudinal axis of the heat transfer tube. The invention also relates to a method for manufacturing said heat transfer tube.

A process is disclosed for fractionating biomass-based material. The process includes evaporating an evaporable part of biomass-based material in a short path evaporator, SPE, to produce a depitched lights fraction in liquid form, and a heavier pitch fraction. The depitched lights fraction may contain depitched tall oil in liquid form, and the heavier pitch fraction may contain tall oil pitch, TOP.

The present invention provides an industrial wastewater recovery apparatus (100) aiming at Zero Liquid Discharge (ZLD). The apparatus (100) provides two stages in pre-heating the spiral coil pipe (103) containing wastewater and also conserves the heat by using the two heat exchangers (104, 105). The apparatus (100) agitates the surface wastewater to increase the rate of evaporation for faster heating. The apparatus (100) provides two stages in condensation of distilled water and also provides real-time monitoring of the water quality. The apparatus (100) provides automatic cleaning in the various parts during the operations. Further, a plurality of IoT sensor (201) monitor the real time parameters of the industrial wastewater recovery apparatus (100) and data is available to the user on the electronic display device (204).

The present invention provides an industrial wastewater recovery apparatus (100) aiming at Zero Liquid Discharge (ZLD). The apparatus (100) provides two stages in pre-heating the spiral coil pipe (103) containing wastewater and also conserves the heat by using the two heat exchangers (104, 105). The apparatus (100) agitates the surface wastewater to increase the rate of evaporation for faster heating. The apparatus (100) provides two stages in condensation of distilled water and also provides real-time monitoring of the water quality. The apparatus (100) provides automatic cleaning in the various parts during the operations. Further, a plurality of IoT sensor (201) monitor the real time parameters of the industrial wastewater recovery apparatus (100) and data is available to the user on the electronic display device (204).

A stacked type falling film evaporator includes a first evaporator, a second evaporator, a first vapor recovering device, a second vapor recovering device and a vapor recompressor. The first evaporator and the second evaporator respectively have evaporation tubes of a length of 5 m to 10 m, and are stacked in such a manner that wastewater passes through the first evaporator and the second evaporator in order. The first vapor recovering device collects vapor generated from the wastewater in the first evaporator and supplies the collected vapor to the second evaporator. The second vapor recovering device collects vapor generated from the wastewater in the second evaporator and supplies the collected vapor to the first evaporator. The vapor recompressor compresses the vapor collected in the second vapor recovering device before the vapor is supplied to the first evaporator.

The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy) which is suitable for use in a plant for the production of urea; and uses thereof. The disclosure also relates to objects made of said duplex stainless steel. Furthermore, the present disclosure also relates to a method for the production of urea and to a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and to a method of modifying an existing plant for the production of urea.

The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy) which is suitable for use in a plant for the production of urea; and uses thereof. The disclosure also relates to objects made of said duplex stainless steel. Furthermore, the present disclosure also relates to a method for the production of urea and to a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and to a method of modifying an existing plant for the production of urea.

The present invention describes a tall diesel composition obtainable from a crude tall oil, said tall diesel composition comprising carboxylic acids in a range of 50-98 wt % and neutral components in a range of 2-50 wt %, wherein the tall diesel composition comprises 1-20 wt % rosin acids, 6-35 wt % saturated fatty acids and 59-74 wt % unsaturated fatty acids.

A fluid vapor distillation apparatus. The apparatus includes a source fluid input, and an evaporator condenser apparatus. The evaporator condenser apparatus includes a substantially cylindrical housing and a plurality of tubes in the housing. The source fluid input is fluidly connected to the evaporator condenser and the evaporator condenser transforms source fluid into steam and transforms compressed steam into product fluid. Also included in the fluid vapor distillation apparatus is a heat exchanger fluidly connected to the source fluid input and a product fluid output. The heat exchanger includes an outer tube and at least one inner tube. Also included in the fluid vapor distillation apparatus is a regenerative blower fluidly connected to the evaporator condenser. The regenerative blower compresses steam, and the compressed steam flows to the evaporative condenser where compressed steam is transformed into product fluid. The fluid vapor distillation apparatus also includes a control system.