MacWelch L.L.C. has been designing, fabricating and operating molecular sieve dehydrators since 1982. We have built or consulted in the design or modification of many of the molecular sieve units that have been operated  over the past 20 years. Four generations of development, design and operation conducted on our own commercial units have resulted in MacWelch L.L.C. dehydrators that are both operator and maintenance friendly. Our molecular sieves can be produced for much less than units more complex in design by eliminating unnecessary and costly components. This design produces a  highly efficient and more productive unit for today's market. Our molecular sieve units are used extensively to dehydrate ethanol for fuel application. They may also be used in industrial ethanol solvent recovery units to dehydrate acetone and other solvents. Many of our different size units are skid mounted, and designed to be shipped on lowboy trailers or overseas containers. Our units can also be engineered to be easily connected to existing utilities.   MacWelch L.L.C. is available for the transfer of dehydrator technology, consulting on renovations, upgrading, start up and trouble shooting of existing plants, stills and dehydrators.