摘要:
A process for the preparation of polyether alcohols by reacting at least one alkylene oxide with at least one unsaturated starter having at least one active hydrogen atom per molecule under basic catalysis, that the alkoxylation is carried out in at least two stages, in stage (I) the alkoxylation of the starter or starters being carried out with not more than 10 mol of alkylene oxide per mole of starter with a catalyst concentration of not more than 0.0085 mol of basic catalyst per mole and in stage (II) and the optionally following stages, the alkoxylated starter or starters from stage (I) being reacted with further alkylene oxide at a catalyst concentration of at least 0.01 mol of basic catalyst per mole of starter.
摘要:
A process is described for purifying polyalkylene glycols obtained by adding alkylene oxide to alkylene glycol, in which, after addition is complete, the resultant polyalkylene glycol is treated at a pH of >7 with a bleaching agent selected from the group consisting of peroxides, peracids, percarbonates, perborates, peroxodisulfates or oxygen, in each case with or without addition of a bleaching activator.The process is suitable in particular for preparing polyethylene glycol having molar weights from 196 to 203 g/mol which meets requirements of pharmacopeias.
摘要:
The present invention relates to a process for the preparation of monohydroxypolyalkylene oxides (MPAO) which are substantially free of diols, comprising the reaction of at least one monoalcohol as a starter with at least one alkylene oxide in the presence of at least one basic catalyst, the catalyst being used as a solution in water or alcohol or in solvent mixtures which comprise water and/or alcohol.
摘要:
A process is described for purifying polyalkylene glycols obtained by adding alkylene oxide to alkylene glycol, in which, after addition is complete, the resultant polyalkylene glycol is treated at a pH of >7 with a bleaching agent selected from the group consisting of peroxides, peracids, percarbonates, perborates, peroxodisulfates or oxygen, in each case with or without addition of a bleaching activator. The process is suitable in particular for preparing polyethylene glycol having molar weights from 196 to 203 g/mol which meets requirements of pharmacopeias.
摘要:
The present invention relates to a process for the preparation of monohydroxypolyalkylene oxides (MPAO) which are substantially free of diols, comprising the reaction of at least one monoalcohol as a starter with at least one alkylene oxide in the presence of at least one basic catalyst, the catalyst being used as a solution in water or alcohol or in solvent mixtures which comprise water and/or alcohol.
摘要:
A process for preparing polyether alcohols by reacting one or more unsaturated starters having at least one active hydrogen atom per molecule with one or more alkylene oxides in the liquid phase in the presence of a basic catalyst in a reactor, wherein the one or more alkylene oxides are introduced into the reactor in such a way that the concentration of unreacted alkylene oxide in the liquid reaction mixture in the reactor is increased as far as possible with increasing degree of addition of the alkylene oxide onto the starter, with the proviso that the temperature at the end of a runaway reaction is at any point in time at least 100 K below the onset temperature of the decomposition reaction of the liquid reaction mixture, is proposed.
摘要:
A process for the preparation of polyether alcohols by reacting at least one alkylene oxide with at least one unsaturated starter having at least one active hydrogen atom per molecule under basic catalysis, that the alkoxylation is carried out in at least two stages, in stage (I) the alkoxylation of the starter or starters being carried out with not more than 10 mol of alkylene oxide per mole of starter with a catalyst concentration of not more than 0.0085 mol of basic catalyst per mole and in stage (II) and the optionally following stages, the alkoxylated starter or starters from stage (I) being reacted with further alkylene oxide at a catalyst concentration of at least 0.01 mol of basic catalyst per mole of starter.
摘要:
The alkoxylate mixtures comprise alkoxylates of the formula (I) C5H11CH(C3H7)CH2O(B)p(A)n(B)m(A)qH (I) where A is ethyleneoxy, B, in each case independently, are C3-10-alkyleneoxy or mixtures thereof, groups A and B being present in the form of blocks in the stated sequence, p is a number from 0 to 10, n is a number greater than 0 to 20, m is a number greater than 0 to 20, q is a number greater than 0 to 10, p+n+m+q is at least 1, from 70 to 99% by weight of alkoxylates A1, in which C5H11 is n-C5H11, and from 1 to 30% by weight of alkoxylates A2, in which C5H11 is C2H5CH(CH3)CH2 and/or CH3CH(CH3)CH2CH2, being present in the mixture.
摘要翻译:烷氧基化物混合物包括式(I)的烷氧基化物:在线式描述=“In-line Formulas”end =“lead”→> 5 sub> (C 3 H 2)(CH 3)H(O)B(A)N (B)m(A)H(I)<?in-line-formula description =“In-line Formulas”end =“tail” 其中A是亚乙基氧基,B在每种情况下独立地是C 3-10 - 亚烷基氧基或其混合物,基团A和B以所述序列以块的形式存在,p是 0至10的数,n为大于0至20的数,m为大于0至20的数,q为大于0至10的数,p + n + m + q至少为1,从 70重量%至99重量%的烷氧基化物A1,其中C 5 H 11 N 11是n C 5 H 11, 和1至30重量%的烷氧基化物A2,其中C 5 H 11 H 11是C 2 H 5 H CH(CH 3 CH 3)CH 2和/或CH 3 CH(CH 3 CH 3)CH 3 2 CH 2> 2, 存在于混合物中。
摘要:
The present invention relates to novel comb polymers which bear poly-C2-C4-alkylene ether side chains A and functional groups B which at a pH of >12 are present in the form of anionic groups on a carbon backbone and also the salts of such comb polymers. The invention also relates to the use of these comb polymers as additives in preparations comprising a mineral binder. The polyalkylene ether side chains A have the following formula: *—U—(C(O))k—X-(Alk-O)n—Y-Z A where * indicates the point of bonding to the carbon backbone of the comb polymer, U is a chemical bond or an alkylene group having from 1 to 8 carbon atoms, X is oxygen or an NR group, k is 0 or 1, n is an integer whose average value, based on the comb polymer, is in the range from 5 to 300, Alk is C2-C4-alkylene, with the Alk radicals within the group (Alk-O)n being able to be identical or different, Y is a linear or branched alkylene group which has from 2 to 8 carbon atoms and may bear a phenyl ring, Z is a 5- to 10-membered nitrogen heterocycle which is bound via nitrogen and can have, in addition to the nitrogen atom and carbon atoms, 1, 2 or 3 additional heteroatoms selected from among oxygen, nitrogen and sulfur as ring members, with the nitrogen ring members being able to bear a group R′ and 1 or 2 carbon ring members being able to be present as carbonyl groups, R is hydrogen, C1-C4-alkyl or benzyl and R′ is hydrogen, C1-C4-alkyl or benzyl.
摘要:
The alkoxylate mixtures comprise alkoxylates of the formula (I) C5H11CH(C3H7)CH2O(B)p(A)n(B)m(A)qH (I) where A is ethyleneoxy, B, in each case independently, are C3-10-alkyleneoxy or mixtures thereof, groups A and B being present in the form of blocks in the stated sequence, p is a number from 0 to 10, n is a number greater than 0 to 20, m is a number greater than 0 to 20, q is a number greater than 0 to 10, p+n+m+q is at least 1, from 70 to 99% by weight of alkoxylates A1, in which C5H11 is n-C5H11, and from 1 to 30% by weight of alkoxylates A2, in which C5H11 is C2H5CH(CH3)CH2 and/or CH3CH(CH3)CH2CH2, being present in the mixture.
摘要翻译:烷氧基化物混合物包括式(I)的烷氧基化物:C 5 H 11 CH(C 3 H 7)CH 2 O(B)p(A)n(B)m(A)qH(I)其中A是亚乙基氧基,B各自独立地是C3- 10-亚烷基氧基或其混合物,基团A和B以所述顺序以嵌段的形式存在,p为0至10的数,n为大于0至20的数,m为大于0至 20,q是大于0至10的数,p + n + m + q至少为1,70至99重量%的烷氧基化物A1,其中C5H11为n-C5H11,1〜30%为 其中C5H11是C2H5CH(CH3)CH2和/或CH3CH(CH3)CH2CH2)的烷氧基化物A2的重量存在于混合物中。