An apparatus for heating or removing a water phase from organic material, the apparatus comprising: - a container, said container being substantially horizontal and where the lower portion of the container has a cylindrical shape, said container 1 further comprising an inlet and an outlet, - a plurality of semi-cylindrical disc-shaped hollow compartments parallel and interspace arranged in the container, a jacket arranged around the container for conducting heating media, - an axis arranged centrally within the container, and - scrapers attached to, and rotating on the centrally arranged axis, said scrapers being shaped to scrape an outer surface of two parallel and interspace arranged disc-shaped hollow compartments and extending towards and to scrape the inner surface of the container, wherein - the semi-cylindrical disc-shaped hollow compartments comprising hollow protrusions which connect to the jacket through connection openings in the container, said protrusions being positioned on each side in the upper part of the semi-cylindrical disc-shaped hollow compartments in line with the relatively flat upper part of the semi-cylindrical disc-shaped hollow compartments and in the lowest part of the semi-cylindrical disc-shaped hollow compartments, where a connection portion on each side of the upper side of the semi-cylindrical disc-shaped hollow compartments sits in a recess on each side of the inner side of the container, and where the semi-cylindrical disc-shaped hollow compartments do not connect to the whole circumference of the cylindrical portion of the container, but connect to the inner surface of the container through the connection portions in the disc-shaped hollow compartments with open spaces between connection portions where part of the material flows through, and wherein the scrapers have three different scraping members, two disc scrape members and to scrape the semi-cylindrical disc-shaped hollow compartments on each side and one end scrape member to scrape inner surface of the container, and wherein the scrapers have hollow space between the different scraping members. - a container, said container being substantially horizontal and where the lower portion of the container has a cylindrical shape, said container 1 further comprising an inlet and an outlet, - a plurality of semi-cylindrical disc-shaped hollow compartments parallel and interspace arranged in the container, a jacket arranged around the container for conducting heating media, - an axis arranged centrally within the container, and - scrapers attached to, and rotating on the centrally arranged axis, said scrapers being shaped to scrape an outer surface of two parallel and interspace arranged disc-shaped hollow compartments and extending towards and to scrape the inner surface of the container, wherein - the semi-cylindrical disc-shaped hollow compartments comprising hollow protrusions which connect to the jacket through connection openings in the container, said protrusions being positioned on each side in the upper part of the semi-cylindrical disc-shaped hollow compartments in line with the relatively flat upper part of the semi-cylindrical disc-shaped hollow compartments and in the lowest part of the semi-cylindrical disc-shaped hollow compartments, where a connection portion on each side of the upper side of the semi-cylindrical disc-shaped hollow compartments sits in a recess on each side of the inner side of the container, and where the semi-cylindrical disc-shaped hollow compartments do not connect to the whole circumference of the cylindrical portion of the container, but connect to the inner surface of the container through the connection portions in the disc-shaped hollow compartments with open spaces between connection portions where part of the material flows through, and wherein the scrapers have three different scraping members, two disc scrape members and to scrape the semi-cylindrical disc-shaped hollow compartments on each side and one end scrape member to scrape inner surface of the container, and wherein the scrapers have hollow space between the different scraping members.