In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more than about 1.6 wt. %.

A solvent composition which comprises a fluorinated solvent containing no chlorine atom in its molecule, a hydrocarbon solvent and a glycol ether and which is free from phase separation, wherein the compositional ratio of the fluorinated solvent and the hydrocarbon solvent is a compositional ratio such that a two component mixture composed solely of the fluorinated solvent and the hydrocarbon in such a compositional ratio would separate into two phases.

A solvent composition comprising 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether in an amount of from 25.0 to 75.0% (by mass, and the same applies hereinafter), trans-1,2-dichloroethylene in an amount of from 15.0 to 74.9%, and a C.sub.1-3 alcohol in an amount of from 0.1 to 10.0%, to the total amount of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, the trans-1,2-dichloroethylene and the C.sub.1-3 alcohol. The solvent composition of the present invention can remove soil such as fl...

A solvent composition comprising 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane (R52-13), trans-1,2-dichloroethylene (tDCE) and a C.sub.1-3 alcohol, wherein the content of R52-13 is from 25.0 to 75.0% (by mass, and the same applies hereinafter), the content of tDCE is from 15.0 to 74.9% and the content of the C.sub.1-3 alcohol is from 0.1 to 10.0%, to the total amount of R52-13, tDCE and the C.sub.1-3 alcohol. This solvent composition can remove oils and greases and flux with a high cleaning perf...

In a method for making bisphosphonates by reacting a carbonyl compound with a phosphorus halide, the reaction is carried out in a solvent/carrier system which is a mixture of an amine hydrochloride, phosphorous acid and optionally phosphoric acid.

Composition comprising at least one hydrofluoroalkane and at least one fluoropolyether.

Encapsulating (potting) compositions which contain a linkage that is suscible to hydrolytic cleavage; i.e., polyamides, polyesters and polyester base type polyurethanes, and which have deteriorated due to exposure to a hot, moist atmosphere are dissolved by contacting with a solvent comprising a solution of benzyltrimethylammonium hydroxide preferably containing a constituent selected from the group consisting of (a) tetrahydrofuran and acetone, (b) methylene chloride (c) methylene chloride and ...

There is described a process for the extraction of at least one relatively polar component from a material which may be naturally occuring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comprising a C.sub.1 to C.sub.4 fluorinated hydrocarbon, especially 1,1,1,2-tetrafluoroethane and a co-solvent having a dielectric constant (at 20.degree. C.) of at least 5; and (b) separating the charged solvent from said material, thereby to isola...

The solvent composition of the present invention comprises diphenylmethane derivative (a) represented in general formula (I) below, and polyether (b) represented by general formula (II) below, and has high safety, low odor-emission, excellent dissolving power for various organic materials, and high affinity for various substrates. ##STR00001## (In the formula, n represents 1 or 2, each of x and y independently represents 0, 1, 2, or 3, each of R.sub.1 and R.sub.2 independently represents a C.sub...

A self-closing solvent dispensing container fabricated from plastic and characterized so that the forefinger of the hand holding the container can operate a dispensing valve on the container without the container slipping from the grip.