![]() ![]() The Texaco solvent dewaxing process (also called the MEK process) uses a mixture of MEK and toluene as the dewaxing solvent, and sometimes uses mixtures of other ketones and aromatic solvents. The solvent is recovered from the dewaxed oil and wax cake by flash vaporization and recycled back into the process. The primary wax cake is diluted with additional solvent and filtered again to reduce the oil content in the wax. The filtrate is used to chill the feedstock and solvent mixture. The slurry is filtered using rotary vacuum filters and the wax cake is washed with cold solvent. Both processes consist of diluting the waxy feedstock with solvent while chilling at a controlled rate to produce a slurry. The most widely used ketone processes are the Texaco solvent dewaxing process and the Exxon Dilchill Process. Other processes that are used to a lesser degree include the Di/Me process and the propane dewaxing process. The major processes in use today are the ketone dewaxing processes. Solvent recovery removes the solvent from the wax cake and filtrate for recycling by flash distillation and stripping. The filtration step removes the wax from the solution of dewaxed oil and solvent. ![]() In the crystallization step, the feedstock is diluted with the solvent and chilled, solidifying the wax components. ![]() Solvent dewaxing consists of the following steps: crystallization, filtration, and solvent recovery. ![]() Speight PhD, DSc, PhD, in Handbook of Industrial Hydrocarbon Processes (Second Edition), 2020 8.1.5 Solvent dewaxing ![]()
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