- Swenson Walker Crystallizer Pdf File
- Swenson Walker Crystallizer Pdf Instructions
- Swenson Walker Crystallizer Pdf Download
- Swenson Walker Crystallizer Pdf Download
- Swenson Walker Crystallizer Pdf Reader
Swenson Walker Crystallizer is a continuous type crystallizer designed to make the large, uniform crystals .This operation involves both heat and mass transfer. It works on principle of super saturation by cooling.
The Swenson-Walker crystallizer. Oae of the commonest types of continuous crystallizers (with cooling only) used in the United States is the Swenson-Walker crystallizer, shown in Fig. It consists of an open trough A, 24 in. Wide, with a semicylindrical bottom, a water. Swenson-walker crystallizer Description: It consists of an open trough (A) 2 ft wide, with a semicylindrical bottom. A water jacket (B) is welded to the outside surface of the trough. Swenson-Walker Crystallizer. It consists of an open trough with a semicircular bottom having a cooling water jacket welded outside. It is about 2 ft wide and 10 ft long. The hot concentrated solution to be crystallized is fed at one end of the trough and cooling water usually flows through the jacket in counter current to the solution.
Swenson Walker Crystallizer Pdf File
Introduction:
- Swenson Walker Crystallizer is a continuous type crystallizer. This operationinvolves both heat and mass transfer.
- Crystallization is the formation of solid particles within ahomogeneous phase. It may occur as the formation of solid particles in a vapor, as in snow; as solidification from a liquid melt, as in the manufacture of largesingle crystals; or as crystallization form liquid solution.
- In the formation ofcrystals two steps are required:
- Nucleation: i.e. the birthof a new solute particle
- Crystal growth: i.e. the growth of the nucleus to macroscopicsize.
Principle:
- It works on principle of Super saturation by cooling. A very common type of continuous crystallizer using cooling alone to bring about supper saturation is the Swenson-walker crystallizer.
Construction:
- It consists of U- shaped opentrough with a semi cylindrical bottom.
- A water jacket welded to theoutside of trough.
- A slow speed, long pitch,spiral agitator running at about 7 RPM and set as close to bottom of the troughas possible.
- Water jacket is divided intosection so that differential cooling may be used in the various zones.
- The crystallizer is built inunits 10ft long and number of units may join together to increase the capacity.
- For still higher capacity, thislarger unit may be arranged one above the other such that the solution cascadefrom one unit to other.
Operation:
Swenson Walker Crystallizer Pdf Instructions
- The hot concentrated solutionto be crystallized is fed at one end of trough & cooling water usuallyflows through the jacket in counter current to the solution.
- Sometimes extra amount of wateris introduced into certain sections of trough to control crystal size.
- Nucleation may be started byshort cold zone followed by gradual cooling.
- Functions of the spiral stirrerare :
- To prevent an accumulation ofcrystals on the cooling surface.
- To lift the crystal formed& shower them down through the solution so crystal grow uniformly and freefrom aggregate and inclusion of mother liquor.
- At the end of the crystallizer,there is overflow gate where crystals and mother liquor overflow to drain box.
- From the mixture, mother liquoris returned to the process & wet crystals are fed to centrifuge.
Advantages:
- Less floor space is required
- Saving labor
- Continuous process
- Crystal of uniform size, freefrom inclusions/aggregates
Swenson Walker Crystallizer Pdf Download
Disadvantages :
- Scrapper may break crystal tothe little extent due to agitation.
Currently Available Swenson Crystallizer in Market :
Swenson Walker Crystallizer Pdf Download
- Swenson Draft Tube Baffle (DTB)crystallizer is the most successful of the crystallizers designed to make thelarge, uniform crystals required for fertilizer and similar applications wheresuperior filtration, centrifugation, washing, drying, and storagecharacteristics are required. This design is the result of years of researchand development as well as proven plant scale operation in hundreds ofinstallations.
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