摘要:
The present invention relates to a process for the preparation of alkali metal salts of 2-phosphonobutane-1,2,4-tricarboxylic acid, characterized in that 2-phosphonobutane-1,2,4-tricarboxylic acid penta-alkyl esters or partial esters are reacted with an aqueous alkali metal hydroxide solution in a ratio of from 0.5 to 0.76 mol, preferably from 0.6 to 0.7 mol of alkali metal hydroxide per mol of ester function at temperatures from 20.degree. to 200.degree. C. in a one-shot process.
摘要:
The present invention relates to a process for eliminating 1-phosphono-1-carboxycyclopentan-3-one (ketone) from, or reducing its content in, an aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid, characterized in that the solution is adjusted to a pH value of > 6 using an aqueous inorganic base, particularly sodium hydroxide, and aqueous bleaching liquor is subsequently added in a molar ratio of NaOCl to ketone of >5:1.
摘要:
This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.
摘要:
This invention relates to an improved process for the continuous production of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and alkali metal salts thereof, in which dialkylphosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, are reacted in the presence of a basic catalyst to form phosphonosuccinic acid tetraalkyl ester, the ester thus obtained is directly reacted with alkyl-acrylate, in the presence of an alkaline catalyst and the reaction product thus obtained is directly hydrolyzed to PBTC or alkali metal salts thereof.
摘要:
Water is conditioned by adding thereto a corrosion-inhibiting, concretion inhibiting, precipitation retarding, deflocculating, dispersing or fluidifying amount of an acid of the formula ##STR1## in which R.sup.1 and R.sup.2, independently of one another, represent hydrogen where a or b=1, or where a or b=0 represent an optionally substituted alkyl radical with 1-8 carbon atoms or an optionally substituted phenyl radical,R.sup.3 represents hydrogen, an optionally substituted alkyl radical with 1 to 4 carbon atoms, an optionally substituted phenyl radical, a halogen atom from the group comprising fluorine, chlorine and bromine, a hydroxyl group, an alkoxy group containing 1 to 8 carbon atoms, a carboxyl group or a group --P(O)--(O).sub.a --R.sup.1 OH,R.sup.4 represents hydrogen, an alkyl radical with 1 to 4 carbon atoms, an alkenyl radical with up to 3 carbon atoms, an optionally substituted phenyl radical, a carboxyl group, a fluorine or chlorine atom or a group --P(O)--(O).sub.a --R.sup.1 OH, orR.sup.3 and R.sup.4 together form a ring bridge with 3 to 5 methylene groups,R.sup.5 represents hydrogen, an optionally substituted alkyl radical with 1 to 4 carbon atoms, a carboxymethyl or carboxyethyl group optionally substituted by a methyl group, a succinyl group or a group having the structure--CHR.sup.4 --CHR.sup.3 --P(O)--(O).sub.a --R.sup.1 OH or the structure--CH.sub.2 --P(O)--(O).sub.a --R.sup.1 OH,R.sup.6 represents an optionally substituted phenyl radical, a carboxyl group or a group having the structure --P(O)--(O).sub.b --R.sup.2 OH, anda and b independently of one another represent the numbers 0 or 1,or a salt thereof.
摘要:
In the production of phosphorous or phosphonous acid ester chlorides of the formulaR.sub.m (R'O).sub.n PCl.sub.3-m-nwhereinR and R' are various organic radicals,m = 0 or 1,n = 1 or 2, andm+n = 1 or 2,By reacting a trialkylphosphite, a triarylphosphite, a dialkylchlorophosphite or a diarylchlorophosphite with phosphorustrichloride, phosphorous acid alkyl ester dichloride, phosphorous acid aryl ester dichloride, or by reacting a dialkyl-phosphonite with dichlorophosphonite, at a temperature between about -10.degree. C and 120.degree. C, the improvement which comprises effecting the reaction in the presence of a catalytic quantity of a compound of at least one of 3- and 5-valent phosphorus, e.g. a phosphine, phosphine oxide, phosphine sulfide, halogen-phosphorane or phosphoric acid-tris-amide. A small amount of an alcohol or dialkalphosphite increases the yield.
摘要翻译:在制备磷或膦酸酯的情况下,式Rm(R'O)nPCl3-mn,其中R和R'为各种有机基团,M = 0 OR 1,N = 1或2,M + N = 1 OR 2,通过用磷酸三氯化磷,磷酸二烷基酯,磷酸三氟乙酸盐,磷酸二苯酯或二氯磷酸盐反应二氢氯磷酸盐,在-10℃下反应,形成三磷酸盐,二氢氯磷酸盐,二氢氯磷酸盐或二氢氯磷酸盐 和120℃,其改进包括在催化量的3-和5-价磷中的至少一种的化合物存在下进行反应,例如 膦,氧化膦,硫化膦,卤素 - 正膦或磷酸 - 三 - 酰胺。 少量的酒精或二亚磷酸酯提高产量。
摘要:
Flame retardant isocyanate addition products are made by reacting an isocyanate with a compound selected from the group consisting of 1-phosphonoethane-2-carboxylic acid-tri-C.sub.1 -C.sub.4 -alkyl esters, 1-phosphonopropane-2-carboxylic acid-tri-C.sub.1 -C.sub.4 -alkyl esters and mixtures thereof. Known isocyanate-reactive compounds, blowing agents, catalysts, additives and auxiliary agents may optionally be included in the reaction mixture. These flame retardant products are useful in construction applications such as insulation panels for roof insulation.
摘要:
Sulfonic acid group-containing polyaspartic acid derivatives, some of which are novel, having repeating units of the structures I and II ##STR1## in which ##STR2## are suitable for water treatment and as a detergent additive.
摘要:
Sulfonic acid group-containing polyaspartic acid derivatives, some of which are novel, having repeating units of the structures I and II ##STR1## in whichR.sup.1 has the meaning given in the description, are suitable for water treatment and as a detergent additive.
摘要:
An improved composition for water treatment and for alkaline cleaning contains polyaspartic acid or a derivative thereof and a polycarboxylic acid.