Application of piston pushing centrifugal phase in production of chloroacetic acid Abstract: Introduced the process flow and operation effect of replacing the suction filter box with HR-400-N centrifuge in the chloroacetic acid drying process, determined the best process parameters, simplified the operation and improved the product quality
Keywords: chloroacetic acid; piston pusher centrifuge; drying Our company built a production unit with an annual output of 5,000 t of chloroacetic acid (100%) in 1996. It uses batch production and uses chlorine gas and glacial acetic acid as raw materials. Under the action of catalyst sulfur, it reacts to produce chloroacetic acid and at the same time produces hydrogen chloride gas by-product. The whole production process is divided into chlorination, crystallization, drying, mother liquor treatment, tail gas absorption and other processes. In the drying process, a suction filter box is used for suction filtration and drying of the crystallized chloroacetic acid suspension. Because the suction filtration time is too long, the entire production cannot be carried out smoothly, resulting in the product quality and output not reaching the design value, making this process In the whole production process, "the bottle has a short process, easy operation, high drying efficiency and other consumption.

2 New major equipment
2.1 One HR400-N centrifuge made of titanium One HR400-N centrifuge made of titanium was selected as the chlorine Acetic acid separation and drying equipment. HR400-N centrifuge is a two-stage horizontal piston pusher, continuous operation centrifugal filter centrifuge. It can complete all operating procedures at full speed, such as feeding, separating, drying, unloading, etc., and is suitable for the suspension of granular crystalline or fibrous materials in the separation.
Its working principle is briefly described as follows:
After the drum rotates at full speed, the prepared chloroacetic acid suspension is continuously fed into the cloth tray installed on the outer drum through the feed pipe. Under the action of centrifugal force, the suspension is evenly thrown onto the plate net of the inner drum along the circumference, and most of the liquid phase is thrown out of the drum through the mesh gap of the net and the wall hole of the inner drum; solid chloroacetic acid remains on the plate net An annular filter residue layer is formed. With the reciprocating motion of the inner drum, the filter residue layer is moved forward for further drying. Finally, the solid chloroacetic acid is pushed out of the outer drum, and the finished chloroacetic acid is passed through the scraper on the outer drum through the collecting tank. Discharge through the casing outlet along the tangential direction.

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