By-Product Recovery
An important source of revenue for many mills is the sale of wood extractive by-products. Lundberg Systems has a full range of equipment to optimize the recovery of soap recovery from black liquor, deaeration of the recovered soap, and removal of black liquor from the soap. Not only do these systems provide a better quality of soap but they also reduce shipping costs and the chemical consumption during acidulation.
A.H. Lundberg Systems Ltd. is also the leading supplier of turpentine recovery systems. Our systems are designed to recover turpentine from digester flash and relief gases, TMP heat recovery systems and flash digester pre-evaporation systems. Our systems provide dry and low sulphur turpentine for sale.
Turpentine Recovery
A.H. Lundberg provides turpentine recovery systems in both single stage and 2-stage designs. Each system includes a pressure vacuum relief valve, a cyclone entrainment separator, one or two condensers (as requested), an indirect vent gas cooler, a horizontal flooded decanter with weir box, and a flooded horizontal storage tank. The cyclone separator removes both fibre and entrained black liquor, since the black liquor may cause emulsification of the condensate in the decanter. In a 2-stage system, the primary condenser condenses mostly water with some methanol, while the second stage condenser condenses the blow-through containing turpentine from the primary condenser. The condensers are arranged as vertical shell units with the foul vapours condensing in the tubes for ease of cleaning, if necessary. An additional benefit of our 2-stage system is to reduce the size of the decanter while maintaining a high residence time, assuring a high efficiency in separation of the fluids.
Soap Recovery
The A.H. Lundberg scope of supply for efficient soap handling includes our foam breakers to break down problematic foam in black liquor tanks, soap interface level detection system for efficient hydraulic decanting of soap on black liquor, and skimmer-launder vessels to separate and return any incidental liquor carry-over in the soap decanting process. In pine kraft softwood mills tall oil soap is a valuable by-product as well as a toxin in the wastewater treatment system. Thus it is necessary to properly manage foam and soap within the mill. Managing this issue requires a number of steps including the handling and deaeration of foam, separation of soap from liquor, and the separation of liquor from soap. Once the soap is separated from the system, it should be kept separate and not remixed with the liquor.