A composition, method, and device for quantitatively determining the concentration of a dialdehyde in a sample are disclosed. The device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of interacting with a dialdehyde to produce a detectable and measurable response for dialdehyde concentration over a range of 0% to about 20%, by weight of the sample. An indicator reagent composition contains: (a) a diamino carboxylic acid, (b) an option...

In a method of producing a dialdehyde monoacetal(s) (III) from dialdehyde(s) (I) and diol(s) (II), the present invention provides a method comprising a first step wherein said dialdehyde(s) (I) and said diol(s) (II) are reacted to produce dialdehyde bisacetal(s) (IV), the amount by mole of said diol(s) (II) being at least twice the amount by mole of said dialdehyde (I) and a second step wherein said dialdehyde bisacetal(s) (IV) is reacted with said dialdehyde (I). The present invention also prov...

A process for preparing 3(4),8(9)-bisformyltricyclo[5.2.1.0.sup.2.6]decane by hydroformylating dicyclopentadiene with subsequent distillation wherein the hydroformylation of dicyclopentadiene is carried out in two stages, and, in the first hydroformylation stage, the reaction is effected in a heterogeneous reaction system using an aqueous solution of transition metal compounds, containing water-soluble organic phosphorus (III) compounds in complex-bound form, of group VIII of the Period Table of...

Tanning agents containing an .omega.,.omega.-dialdehyde as as the active tanning substance, optionally in a deactivated form, in combination with a polymer containing hydroxyl groups, and methods for using such tanning agents in the preparation of leather, particularly in pickling, tanning, and retanning.

A process for preparing a dialdehyde which comprises subjecting a glycol to oxidation-dehydrogenation in the presence of silver particles of which the surface is partially coated with a silicon carbide powder or a silicon nitride powder. According to the present invention, dialdehydes can be prepared from glycols in high conversion of the glycol in high selectivity into the dialdehyde, and the silver catalyst can be reused even if the reaction is stopped in a while since the silver particles are...

A process for the preparation of glutaric dialdehyde by the reaction of alkoxy dihydropyrans of the general formula I ##STR1## in which R stands for C.sub.1 to C.sub.20 alkoxy, with water at temperatures ranging from 0.degree. to 150.degree. C. and pressures of from 0.01 to 50 bar in the presence of a which microporous, crystalline aluminum silicate catalyst, e.g. a beta-type zeolite or pentasil catalyst having a pore diameter greater than 5.4 .ANG..

The invention relates to a process for obtaining a pure aliphatic dialdehyde monoacetal by reaction of the corresponding aliphatic dialdehyde or a precursor of the corresponding aliphatic dialdehyde with one or more aliphatic mono- or polyhydric alcohols while distillatively removing water to obtain a reaction mixture which is separated distillatively, which comprises carrying out the distillative separation continuously in a dividing wall column to obtain pure aliphatic dialdehyde monoacetal as...

The stiffness of tobacco is increased by treating tobacco with a dialdehyde. The treatment is carried out in the presence of a suitable catalyst. The reaction of the dialdehyde with tobacco may be at room temperature, but is accelerated by heating to 120.degree.-130.degree. C.

Process for the production of terephthalic dialdehyde by hydrolysis of .alpha.,.alpha.,.alpha.',.alpha.'-tetrachloro-p-xylene, which comprises contacting .alpha.,.alpha.,.alpha.',.alpha.'-tetrachloro-p-xylene and steam in a reaction zone at a temperature and for a time sufficient for hydrolysis of the .alpha.,.alpha.,.alpha.',.alpha.'-tetrachloro-p-xylene to form said dialdehyde.

A process in which a dialdehyde is reacted with a polyoxyalkylene glycol to form a dialdehyde glycol condensate which is alkoxylated with propylene oxide, butylene oxide or mixtures thereof and the resulting product is then catalytically aminated to provide, for example, a tetramine is disclosed. These compounds are useful as curing agents for epoxy resins and for reaction with isocyanates to prepare polyurea elastomers and to manufacture articles, such as automotive body panels by reaction inje...