摘要:
Production of (hydroxymethyl)-alkyl, cycloalkyl or aralkylphosphines of the general formula:R.sub.n P(CH.sub.2 OH).sub.3-nin which n stands for 1 or 2 and R stands for identical or different, substituted or unsubstituted alkyl, cycloalkyl or aralkyl radicals having from 1 to 18 carbon atoms. The compounds are made by reacting suitable mono- or di-alkyl, cycloalkyl or aralkylphosphines at atmospheric pressure and at temperatures lower than 40.degree. C with formaldehyde, paraformaldehyde or trioxane in the presence of polar organic solvents being inert with respect to the resulting reaction product, and separating the solvent from the reaction product.
摘要:
Methylphosphine oxides of the general formula (I) ##EQU1## are produced from hydroxymethylphosphines of the general formula (II) ##EQU2## in which formulae R and R' each stand for identical or different alkyl-, cycloalkyl-, aralkyl- or aryl groups having from 1 to 18 carbon atoms, or carrying substituents being inert under the reaction conditions.The methylphosphine oxides are more particularly produced by subjecting the hydroxymethylphosphines to a rearrangement reaction with the aid of radical-yielding compounds.
摘要:
Production of organophosphines of the general formula R.sub.n PH.sub.3-n, in which R stands for identical or different, substituted or unsubstituted alkyl, cycloalkyl or aralkyl groups having from 1 to 18 carbon atoms, preferably from 1 to 4 carbon atoms, more preferably from 1 to 2 carbon atoms, and n stands for a whole number within the range 1 and 3. The compounds are more particularly produced by continuously reacting hydrocarbon halides of the general formula RX, in which R has the meaning given hereinabove and X stands for halogen, especially for chlorine or bromine, with hydrogen phosphide, and primary or secondary organophosphines at temperatures within the range 100.degree. and 600.degree. C. and under pressures of up to 20 atmospheres in contact with a catalyst being placed in a reactor. Gaseous matter issuing from the reactor is cooled and the resulting organophosphonium halides (R.sub.n PH.sub.4-n)X are hydrolyzed in conventional manner to the corresponding organophosphines.
摘要:
Phosphine (hydrogen phosphide) is made by reacting gaseous yellow phosphorus with steam at temperatures of 280 to 400.degree. C in the presence of ammonia in contact with a carbon catalyst.
摘要:
Production of tertiary hydroxyalkylphosphine oxides of general formula (I) ##STR1## in which R.sup.1 and R.sup.2 each stand for organic groups having from 1 to 18 carbon atoms, where R.sup.1 may be identical with R.sup.2 and R.sup.2 may be identical with R which stands for a radical of general formula (II) ##STR2## in which R.sup.3 and R.sup.4 equally stand for organic groups having from 1 to 18 carbon atoms and/or more preferably for hydrogen. The compounds are made from phosphines of general formula (III) ##STR3## in which R.sup.3 and R.sup.4 have the meanings given above, which are reacted in a single step operation with carbonyl compounds of general formula (IV) ##STR4## in which R.sup.3 and R.sup.4 equally have the meanings given above. The reaction is effected while adding at least one substance yielding hydroxyl ions and in the presence of water, and the resulting hydroxyalkylphosphine oxides are separated from the reaction product.
摘要:
The invention relates to the production of phosphorus-containing anticorrosive pigments with a particle size of at most 20 microns by reacting one or more calcium or magnesium compounds with phosphoric acid or acid alkali metal or ammonium phosphates by intimately mixing an aqueous suspension or solution of the reactants inside a dispersing means rotating at a speed of 3000 to 10,000 rpm. More particularly, fine pulverulent calcium and magnesium compounds are converted, with agitation, together with water and, if desired, a water-soluble alkanol to a homogeneous suspension or solution. The suspension or solution is intimately mixed, inside the dispersing means at 0.degree. to 40.degree. C. and in an approximately stoichiometric ratio, with the phosphoric acid or acid phosphate solution. Resulting and precipitated pigment is separated and dried under mild conditions while maintaining its content of water of crystallization. The anticorrosive pigment is comprised of a homogeneous mixture and/or mixed crystals of which 10 to 95 mol % is calcium hydrogen phosphate dihydrate, the balance being magnesium hydrogen phosphate trihydrate. An at least 55 weight % proportion consists of particles with a size of up to 5 microns with a BET-surface of at least 1 m.sup.2 /g.
摘要:
Alkyl phosphines of the general formula:R.sub.n PH.sub.3-n (I)are made. To this end hydrogen phosphide, a primary or a secondary phosphine is reacted with an alkylamine of the general formula:R.sub.n NH.sub.3-n (II)in a molar ratio of 0.1 to 10 mols of the alkylamine of formula II per mol of hydrogen phosphide or primary or secondary phosphine. The reaction is effected at a 150.degree. to 400.degree. C., at atmospheric pressure or a superatmospheric pressure up to 1 atmosphere gauge, and in contact with a catalyst comprising active carbon, copper (II) chromite, or one or more metals of Group Ib or VIII of the Periodic System of the elements. The starting materials are passed through a reaction zone at a rate which permits a contact time between them and the catalyst of 0.1 to 400 seconds.
摘要:
Alkyl phosphines are made. To this end, phosphorus in vapor form is reacted with steam and an alkyl amine at elevated temperature in contact with a carbon catalyst placed in a reactor, the reactants being used individually or in admixture with one another.
摘要:
Phosphine is produced from elementary yellow phosphorus and an aqueous alkali metal hydroxide solution in the presence of an alcohol. The phosphine is more particularly made by using an alcohol having from 5 to 10 carbon atoms and a dissolving power for yellow phosphorus of more than 5 g/l; suspending the phosphorus with agitation in the said alcohol in a reaction zone; reacting the resulting suspension with the alkali metal hydroxide solution at temperatures lower than the boiling point of the alcohol; and collecting the resulting issuing gaseous phosphine.
摘要:
Production of tertiary phosphine oxides which contain nitrile groups and correspond to the following general formula I: ##STR1## in which R.sup.1 and R.sub.2 each stand for a straight or branched, identical or different alkyl, cycloalkyl, aryl, alkylaryl or aralkyl group having 1 to 18 carbon atoms, and in which R.sup.1 or R.sub.2 may be identical with R, which stands for a radical of the following general formula II: ##STR2## in which R.sup.3 and R.sup.4 each stand for a straight or branched, identical or different alkyl, cycloalkyl, aryl, alkylaryl or aralkyl group having 1 to 18 carbon atoms, and/or hydrogen atoms. The tertiary phosphine oxides are made by reacting a phosphine of the following general formula III: ##STR3## in which R.sup.5 has the same meaning as R.sup.3 and R.sup.6 has the same meaning as R.sup.4 but is no hydrogen, with an .alpha.,.beta.-unsaturated nitrile of the following general formula IV: ##STR4## in which R.sup.3 and R.sup.4 have the meanings given above. The reaction is effected in a single stage in the presence of water or a water-solvent mixture and the above formula I compounds are separated from the reaction product.