Abstract: A method for purifying N-vinyl-2-pyrrolidone (NVP) is disclosed. The method comprises crystallizing NVP in the presence of added water to produce purified NVP crystals and a mother liquor, and then isolating the purified crystals. In a preferred method, 0.5 to 4 wt. % of water based on the amount of NVP to be purified is added, and the NVP crystals are washed with additional pure NVP, preferably NVP crystal melt, to give crystals having a purity greater than 99.99%. The method provides a fast, effective way to generate and isolate pure NVP in a single-stage crystallization.

Abstract: A process for purifying grafted polyolefins by extraction is disclosed. The purified grafted polyolefins have improved color and adhesion properties. The extraction is performed with an azeotropic solvent that is strong enough to extract impurities but does not cause sticking of the grafted polyolefin. The azeotropic solvent can be easily recycled.

Abstract: A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, heat being provided by a reboiler, the stripping component and impurities being removed overhead.

Abstract: The present invention provides a distillation separation method whereby tertiary butyl acetate is separated by distillation as an overhead stream from a bottoms acetic acid stream with the proviso that water is incorporated in the system such that the bottoms acetic acid stream contains water in amount of 0.1 to 5 wt %.

Abstract: A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, heat being provided by a reboiler, the stripping component and impurities being removed overhead.

Abstract: A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, heat being provided by a reboiler, the stripping component and impurities being removed overhead.

Abstract: A procedure is provided for the separation of close boiling impurities from products which have slightly higher polarity than the impurities, for example, separation of di-propylene glycol di-tert-butyl ether (DE) from di-propylene glycol mono-tert-butyl ether (DPTB) by distillation, water or steam being used as stripping component with heat provided by a reboiler.

Abstract: High purity tertiary butyl alcohol is obtained from mixtures comprised of tertiary butyl alcohol and tertiary butyl acetate by extractive distillation using a hydrocarbon extractive solvent such as decane.

Abstract: The present invention provides an apparatus for cleaning particulate materials which readily sink in water, being slightly heavier than water, such as beans, peas, grains, etc.; by removing much heavier particulates such as stones, glass, metal pieces, etc., and, by also removing particulates which either float or sink very slowly in water, such as plant stems and leaves, dead insects, bean pods, husks, dust etc. Differences in settling velocities in water are used to separate groups of particulate materials, by allowing the particulates to float or settle through two columns filled with water. The columns have water flowing upward at different velocities, or water flowing upward through one column and stagnant water in the other column.

Abstract: Close boiling hydrocarbon impurities are separated from acetone by extractive distillation using a C.sub.9 -C.sub.14 alkane and/or a C.sub.8 -C.sub.12 aromatic hydrocarbon extractive distillation solvent.

Abstract: Polyethers of polyhydric compounds are prepared by the liquid phase reaction of polyhydric compound and the reaction being carried out with separate liquid phases comprised of a polar polyhydric compound phase and an organic polyether containing phase.

Abstract: The residual level of alkylene oxide in the reaction mixture resulting from reaction of alkylene oxide with carbon dioxide to form alkylene carbonate is reduced by stripping with an inert gas such as carbon dioxide.

Abstract: A tertiary butyl alcohol feed is continuously dehydrated in the liquid phase, in a boiling reactor, a vapor mixture of isobutylene, water, tertiary butyl alcohol and isobutanol and/or secondary butanol is removed and cooled, isobutylene is recovered and the remaining product mixture is phase separated into an upper organic-rich phase which is recycled to dehydration and a lower aqueous phase which is purged.

Abstract: Acetone produced during MTBE production and containing methanol, aldehydes and other organic impurities is contacted with a solution of basic material such as NaOH in lower glycol at conditions effective to polymerize aldehyde impurities, the polymerized impurities are separated, and acetone is separated from methanol in an extractive distillation using the same lower glycol as extractive distillation agent.

Abstract: Glycerine di-t-butyl ether is prepared by the liquid phase reaction of glycerine and the reaction being carried out with separate liquid phases comprised of isobutylene and glycerine.

Abstract: The present invention provides a process for producing isobutylene from a tertiary butyl alcohol purge stream comprised of tertiary butyl alcohol, water and light organics by a hydrocarbon solvent extraction of tertiary butyl alcohol, stripping of the extracted tertiary butyl alcohol from the solvent and dehydration of the stripped tertiary butyl alcohol to form isobutylene.

Abstract: The present invention provides a process for the preparation of MTBE or ETBE wherein TBA is reacted with methanol or ethanol and an effluent is formed which contains the water of etherification and at least 1 mol lower alcohol per 2 mols MTBE or ETBE, this effluent is distilled to separate an overhead of lower alcohol and ether from a bottoms containing the water of reaction, and a lower alcohol/ether admixture from the overhead is reacted with isobutylene to form additional quantities of MTBE or ETBE.

Abstract: A method for producing an aqueous C.sub.2 -C.sub.8 olefin/maleic anhydride copolymer suspension is disclosed. The aqueous copolymer suspension is particularly suitable for use in applications such as fiber spinning syrups in which a copolymer in dry powder form is not needed.

Abstract: The invention relates to recovery of high purity TBA from a mixture with organic impurities whereby water in amount of 1 to 5 wt % is incorporated in the mixture and pure TBA crystals are separated upon cooling and crystallization.

Abstract: Preparation and recovery of 1-t-butoxy-2-propanol in a high state of purity from a crude etherification reaction product obtained by reaction of isobutylene with propylene glycol in the presence of a solid resin etherification catalyst is disclosed. The crude reaction product is distilled to obtain a 1-t-butoxy-2-propanol-containing distillate, thereby leaving propylene glycol as bottoms; the condensed distillate is then further distilled to separate 1-t-butoxy-2-propanol as an overhead product from higher boiling materials.