Mannheim process

Abstract: The paper describes the design of an automatic system for the production of hydrochloric acid from HCl gas released from a potassium sulfate production unit based on the Mannheim process. The proposed automated system replaces manual operation of the pumps and valves in the unit a programmable logic controller (PLC) controlled unit. Automating the unit is expected to increase productivity, maintain product quality, and reduce the risks associated with the operation of the unit.

Abstract: Potassium sulfate was a kind of high-quality potash fertilizer without chloride,which related to the safety of Chinese agriculture development strategySeveral process methods and characteristics of potassium sulfate were summarizedMannheim process for potassium sulfate production,operation principle,advantages and disadvantages and the structure of Mannheim oven were emphatically introducedThe progress of technique-homemade and the recycling condition of by-product were analyzedFinally,the developmental of the process was prospected

Abstract: The invention discloses a tail-gas separation method in the process of producing potassium sulfate by a Mannheim process. The method comprises the following steps: 1) tail gases discharged from a Mannheim furnace are taken, and the taken tail gases enter a packed tower from the lower part of the packed tower; 2) concentrated sulfuric acid is taken, and the taken concentrated sulfuric acid is sprayed from the top of the packed tower into the packed tower; and 3) the tail gases obtained in the step 1) and the concentrated sulfuric acid obtained in the step 2) simultaneously pass through the packed tower in a countercurrent manner to obtain a tower-top gas and a tower-bottom mixed liquid. The method disclosed by the invention utilizes the concentrated sulfuric acid to separate the tail gasesdischarged from the Mannheim furnace, the separated gases only contain a hydrogen chloride gas and air, the hydrogen chloride gas has high purity and can be used as a raw material of a downstream product, and the method has a wide application range, reduces investment of tail-gas treatment, and reduces costs; the separated tower-bottom mixed liquid can be directly sent back to the Mannheim furnaceto participate in a reaction again, so that recycling and high-temperature tail-gas energy recovery and utilization are realized, the problem that the tail gases generated in the process of producingthe potassium sulfate by the Mannheim process are difficult to process is solved, the technological process is short, and the separation efficiency is high.