Abstract: Process for the preparation of crystalline maltitol comprising successively:catalytic hydrogenation of a saccharified starch milk in a vessel 203,a step of chromatographic fractionation of the hydrogenated syrup in a vessel 204,crystallation and separation of the maltitol crystals in vessels 206 and 207 andrecycling through a pipe 309 emerging from the vessel 207 of the crystallization mother-liquors to the head of the chromatographic fractionation step.

Abstract: An adsorptive method of separating alcohols and aldehydes or ketones and alcohols of monoterpenes is disclosed. The method uses an X-type zeolite containing sodium and potassium cations to selectively adsorb the alcohols thereby allowing recovery of an aldehyde or ketone raffinate stream and, after desorption, an alcohol extract stream. The method is suitable for feed mixtures containing individual or multiple monoterpenoid components.

Abstract: A process for liquid-phase separation of ethylene glycol from mixtures containing propylene glycol by selective adsorption on at least one aluminosilicate zeolite selected from the group consisting of X zeolite, Y zeolite, and A zeolite is disclosed.

Abstract: A continuous process for making alkylene glycols by the hydrolysis of alkylene oxides in the presence of selectivity-enhancing organometalate wherein the alkylene glycol-containing hydrolysis product contains organometalate comprises recovering organometalate by extraction with a water-immiscible solvent, separating the resulting organometalate-containing solvent into an organometalate-lean stream for reuse in the extraction and an organometalate-rich stream for reuse in the hydrolysis.

Abstract: In processes for making alkylene glycols by the hydrolysis of alkylene oxides in the presence of selectivity-enhancing metalate anion-containing material, metalate anion can be recovered from the alkylene glycol-containing hydrolysis product by contact with a solid having electropositive complexing sites thereon such as anion exchange resins.

Abstract: A process for the bulk separation of sorbitol from a solution of a carbohydrate mixture by selective adsorption on a zeolite molecular sieve having a faujasite type structure and having predominantly Ca.sup.++ cations in association with the AlO.sub.2.sup.- tetrahedra thereof.

Abstract: Disclosed is a method and associated apparatus by which glycols may be cleaned, particularly those which have been used to dehydrate natural gas. Glycol contaminated with water, hydrocarbons, salts such as sodium chloride, and other impurities is degassed and physically separated from immiscible liquid hydrocarbons prior to passing through a quantity of absorbent material to remove the bulk of any residual hydrocarbons and filter particulates. The glycol is then routed through strong acid cation and strong base anion exchange resins to remove salts. The net product of the deionization is water which may easily be removed in a reboiler, yielding a clean, reusable glycol. Glycol which is not contaminated by petroleum impurity may be cleaned by strong acid cation and strong base anion exchange means alone.

Abstract: A process for the bulk separation of inositol and/or sorbitol is disclosed which comprises the selective adsorption of same on certain types of zeolitic molecular sieves. The process is especially useful for separating inositol from aqueous solutions containing same, using type X and type Y zeolite adsorbents whose cations are Na, Ca or Ba.

Abstract: Mannitol is separated from admixture with galactitol and/or from sorbitol by selective adsorption on cationic forms of zeolite X and zeolite Y.

Abstract: Standard activated carbons have been commonly employed in the purification of contaminated glycol scrubbing solutions used in a liquid-liquid extraction process for the manufacture of petrochemicals. These carbons are shown to cause a depression of pH within the glycol stream when a new carbon type is installed or when the exhausted carbon is replaced. The use of a magnesite containing activated carbon minimizes this pH drop to acceptable levels.

Abstract: The invention is directed to a process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds containing calcium or lead compounds or mixtures thereof. Methanol and a precipitant for calcium and/or lead ions in a quantity equivalent to the ions to be removed are added to the solutions. The deposits thus formed are removed and the residual solutions are treated with a cation exchanger followed by distillation of the low-boiling fractions. The distillation sump which essentially contains the low molecular weight polyhydroxyl compounds is then treated with an anion exchanger.

Abstract: A process for extracting xylitol from the end syrups of the xylitol crystallization by subjecting the end syrup to chromatographic separation, whereby it will be decomposed into two or more fractions, the first fraction containing mainly the polysaccharides and polysaccharide alcohols and the subsequent fractions containing essentially the pentitols and hexitols.