Equipment

By-Product Recovery

Turpentine Recovery

A.H. Lundberg Systems provides turpentine recovery systems in a 2-stage design. Each system includes a pressure vacuum relief valve, a cyclone entrainment separator, two condensers, an indirect vent gas cooler, a horizontal flooded decanter with weir box, and a flooded horizontal storage tank.

The cyclone separator removes both fiber and entrained black liquor, since the black liquor may cause emulsification of the condensate in the decanter. 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

In 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.

The A.H. Lundberg Systems scope of supply for efficient soap handling includes:

Once the soap is separated from the system, it should be kept separate and not remixed with the liquor.

 

Methanol Recovery

The A.H. Lundberg Systems methanol recovery process recovers methanol from stripper off gas. The system includes:

The resulting methanol is condensed, cooled and stored as a high purity liquid for plant use.