The present invention relates to a method and an apparatus for continuously separating aromatic dialdehyde from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene. The method for continuously separating aromatic dialdehyde includes the steps of congealing aromatic dialdehyde by cooling the gas-phase reaction mixture including the aromatic dialdehyde, which is obtained by gas-phase oxidation of dimethylbenzene, to 5-70.degree. C. and separating the congealed aromatic dialdehyde...

Binders for foundry core sands and the like comprising furfuryl alcohol and an aromatic dialdehyde and optionally an aromatic alcohol.

Described herein is a process for rapidly obtaining a stable freeze point depressed aqueous solution comprising a dialdehyde and an aliphatic monohydroxyl alcohol and/or polyhydroxyl alcohol by adding thereto a catalytic amount of a strong acid. Also included herein is a method for liberating the dialdehyde in the aqueous solution by dilution with water and the addition of a catalytic amount of a strong acid.

Disclosed is the novel compound 4,4'-diphenylether-dialdehyde-bis-dimethylacetyl of the formula ##STR1## and a process for its preparation from di-p-tolyl ether ##STR2## by anodic oxidation of the latter in the presence of methanol and of a supporting electrolyte. The anode material used in this reaction is preferably platinum, lead dioxide, graphite or vitreous carbon, and the cathode material used is preferably steel, nickel, or graphite. The supporting electrolyte used is preferably NaOCH.sub...

Starch can be gelatinised more efficiently by a thermomechanical treatment, if a dialdehyde polysaccharide with a relatively low degree of oxidation is added to the starch. This thermomechanical treatment can be carried out at a temperature below 115 DEG C., or even below 100 DEG C., and with a high throughput rate. With this treatment a granulate or other semi-finished product is obtained that can be shaped to produce an article that has excellent dimensional stability in water. By adding diald...

Homogeneous mixtures are described and can be processed to give shaped biodegradable and physiologically nonhazardous articles, such as packagings for food or drink or pharmaceutical products, sausage casings and the like. The mixtures comprise dialdehyde starch with a degree of oxidation of greater than 30%, starch which does not exhibit any iodine-starch reaction, and/or modified starch, water and other plasticizers, and also, if desired, other biopolymers and additives.

Stilbene-4,4'-dialdehyde can be produced by reaction of ethylene with 4-bromobenzaldehyde in the presence of a base and of a palladium compound as catalyst in a simple and economical manner in high yields, by performing the reaction under a partial pressure of ethylene of 0.01 to 1 bar. The stilbene-4,4'-dialdehyde obtained is suitable for example for producing optical brighteners.

Enolic monoether and diether of adipic dialdehyde such as 6-methoxy-5-hexene-1-al, 1,6-dimethoxy-1,5-hexadiene, 1,6-bis-(2 hydroxy propoxy)-1,5-hexadiene are prepared by heating to a sufficiently high temperature for a Cope rearrangement, e.g., 150.degree. to 450.degree. C. of the corresponding monoether or diether of 1,5-hexadiene-3,4-diol.

A stable, solid or semi-solid, antimicrobial composition is provided comprising a dialdehyde antimicrobial agent such as glutaraldehyde, and a carbohydrate such as a sugar or a polyol such as a sugar alcohol. The composition can be employed to preserve, sanitize, disinfect, or sterilize a contaminated surface or area. The composition can also be combined with an absorbing agent to produce a moisture absorbent antimicrobial composition which can be used to absorb and disinfect biological spills s...

A stable, solid or semi-solid, antimicrobial composition is provided comprising a dialdehyde antimicrobial agent such as glutaraldehyde, and a carbohydrate such as a sugar or a polyol such as a sugar alcohol. The composition can be employed to preserve, sanitize, disinfect, or sterilize a contaminated surface or area. The composition can also be combined with an absorbing agent to produce a moisture absorbent antimicrobial composition which can be used to absorb and disinfect biological spills s...